WO1999010625A1 - Placer gold mining method, placer gold mining boat used in this method, placer gold digging and separating method and system therefor, and placer gold separating method and system therefor - Google Patents

Abstract

A placer gold separating method comprising subjecting placer gold- and gold ore-containing sand and gravel layers accumulated on the bottom of the water of a river and placer gold- and gold ore-containing sand and gravel layers formed deep in the ground to excavation or suction excavation by utilizing a water pressure difference, causing a mixture of the excavated or suction excavated placer gold- and gold ore-containing sand, gravel and water to flow horizontally by the action of a pressure fluid, and separating the placer gold and gold ores by utilizing a specific gravity difference while the mixture is flowing; and a system for this method. A placer gold mining boat used to practice this method and provided thereon with a combination of a suction excavation means, a mixture transfer means, a means for separating placer gold by utilizing a specific gravity difference, and a means for discarding the remaining mixture from which the placer gold has been separated. A placer gold separating method characterized by causing a mixture of placer gold and gold ores or pulverized gold ores and water to flow in a metallic cylinder, generating a magnetic field by a magnetic field generating means provided on an outer circumferential surface of the metallic cylinder, and magnetically depositing the placer gold in the mixture on the inner surface of the metallic cylinder, whereby the placer gold is separated.

Description

 9/10625

Description Dust collection method for gold dust, etc., extraction vessel for gold dust, etc. used for this purpose, excavation and separation method for gold dust, etc. and its system, and separation method for gold dust, etc. and its system

 The present invention suctions and excavates gold deposits and sand layers containing gold ore in rivers (including lakes and marshes as well as rivers), and separates them by utilizing the difference in specific gravity to separate gold and Z or gold or gold. A method of collecting gold dust, etc., for the purpose of collecting ore (hereinafter, gold dust or gold ore, and gold dust and gold ore is collectively referred to as “gold dust”), and gold dust used for this purpose And so on. Another object of the present invention is to excavate a sand layer containing gold dust and the like, excavate it and lift it to the ground, and separate the gold dust and the like by using a difference in specific gravity while transporting it at a constant speed. The present invention relates to a method of excavating gold dust and the like and a system therefor. Further, the present invention relates to a method and a system for separating gold dust or the like for separating gold dust or the like from a rock or a mixture of minerals using a magnetic force.

 Background art

 Conventionally, in order to collect gold dust mixed in sand layers of rivers (including lakes and marshes as well as rivers), washing and separation of sand that has been scooped up by human power is mostly performed. Sands obtained by excavating the sand layer containing gold dust were elutriated to separate the gold dust. In the excavation, the excavation is performed by a machine. When the layer containing the gold dust is located at a deep place, there is no excavation means. In such a case, for example, if a very large hole is excavated very deeply, and only the sand layer containing gold dust is excavated and separated and transported, it is not impossible to treat with the existing technology. The most expensive method is unprofitable, and it has been neglected if the layer containing gold dust is located at a large depth.

Further, as described above, sands obtained by excavating a sand layer containing gold dust and the like were elutriated to separate gold dust and the like.Thus, although extensive facilities were required, improvement in efficiency was not achieved. Difficult and groundbreaking methods for sorting gold dust have not yet been proposed. In other words, conventional elutriation by manual labor is not only heavy labor, but also has the problem that it is not profitable if the ratio of sand containing small amount of sand is small due to its low efficiency. Even when excavated sand is elutriated, a large amount of sand must be elutriated. Difficultly, the profitability was limited to the case where the ratio of gold dust etc. was particularly large.

 On the other hand, the currently known layer containing gold dust etc. is believed to have been deposited over a depth of 100 m or more from the ground surface. Excavation of up to 2 O m is the limit, especially in areas where the groundwater level is 5 m to 10 m.Excavation of the sand layer that is deeper than the groundwater level is considered not to be profitable. It is abandoned ore. In other words, when the layer containing gold dust or the like exists at a depth of 100 Om or more from the ground surface, there is no excavation method or transfer method that can be used on a profitable basis.

 Furthermore, in the conventional elutriation separation using the difference in the specific gravity of gold or the like (so-called specific gravity selection), the gold or the like flows down along with water over a wide area and is elutriated. However, the separation efficiency is poor, and not only requires a vast amount for separation, but also gold dust and the like obtained by specific gravity selection are collected by human power, so there is a problem that a large amount of human labor is required. It was considered one of the causes of soaring collection costs. In addition, since elutriation separation, which has been conventionally performed, is gravity selection, a natural flow (by head) method has been adopted, and forcible large-volume transmission using a pump or the like has not been proposed. Disclosure of the invention

 The present invention relates to excavation of a sand layer containing gold dust and the like, and sand excavated from the sand layer ("a mixture containing gold dust, sand, earth and sand, various minerals, rocks, etc." Hereinafter, in this specification, “sand®J” is forcibly fluidized, and the difference in specific gravity is used to separate the gold dust, etc., so that the labor required to separate the gold dust is small and large-scale processing is possible. Thus, the above-mentioned conventional problem was solved.

In other words, the method of collecting gold dust and the like proposed by the present invention is as follows: a sand layer containing gold dust and the like existing under water such as a river (including a river and a lake and a swamp) is sucked and excavated; Kind This method is characterized in that gold is transported at a desired speed, and gold dust and the like are separated and collected by using means for separating gold and the like using a difference in specific gravity. In the above, the means for separating gold dust and the like using the difference in specific gravity is configured to change the flow velocity during the transfer of a mixture of sands and water to settle and separate the gold dust and the like having a large specific gravity. can do. Alternatively, centrifugal force may be applied to the mixture of sands and water to separate the gold dust having a large specific gravity and the other materials having a small specific gravity into and out of the mixture. Furthermore, these two types of means may be used in combination.

 The above-mentioned method for collecting gold dust or the like can be carried out using a boat for collecting gold dust or the like described below. In other words, a vessel for collecting gold dust, etc., in which the hull is sequentially connected with suction digging means, pipe transfer means, means for separating gold dust using the difference in specific gravity, and means for discarding the remaining sand from which the gold dust has been separated. It is. In the above, the suction and excavation means inserts one end of the suction pipe into a layer of sand containing gold dust and the like, and connects the other end to a transfer pipe provided with a pressurized fluid blowing nozzle as an acceleration means. It was done. Further, the pipe transfer means opens a pressurized fluid injection nozzle inside the transfer pipe, and transfers the mixture of sand and water in the transfer pipe within the transfer pipe while accelerating the transfer speed. It is configured. Further, the means for separating gold dust or the like by using the difference in specific gravity in the above is to connect a separation box having a cross-sectional area larger than the cross-sectional area of the transfer pipe to a part of the transfer pipe, It is designed to settle down gold dust etc. by utilizing flow velocity reduction. Alternatively, centrifugal separation means can be interposed in a part of the transfer pipe. This centrifugal separation means pressurizes and blows a mixture of sand and water into a cylindrical outer tank wall from a tangential direction, and spirally turns the mixture along the inner wall of the cylindrical tank, The mixture can be distributed inside and outside according to specific gravity, and can be used as a centrifuge for separating gold dust and the like. The above two types of means can be used in combination as a means for separating gold dust or the like by utilizing a difference in specific gravity.

 In the process of the present invention, any technology having the same effect as that known before the filing of the application can be applied to the present invention.

The present invention is intended to separate and collect gold dust and the like mixed in a sand layer, and advantageously exploits the fact that the specific gravity of the gold dust and the other materials is significantly different. Separation of the mixture of sand and water containing gold etc. while forcibly flowing and transporting it eliminates the need for a large-scale elutriation device, as is conventionally known. You can sort well. In addition, the remaining sand separated by power, such as gold dust, is returned to the river as it is, so there is no need to use a great deal of labor and time to dispose of unnecessary sand.

 The rivers and the like in the above invention include lakes and marshes as well as rivers. The present invention can be adopted even when the water depth is deep in lakes and swamps. For example, even when the water depth is 10 m to 100 m or more, if the ship is excavated by suction using a jet pump and lifted up on a ship by a transfer pipe, the onboard treatment according to the above invention is performed. There is nothing different. However, in the case described above, a jet pump and necessary power should be installed on the ship, the water should be transferred by a transfer pipe, and separation means and other processing equipment should be installed on the shore of the lake or swamp. become.

 In the above case, there is an advantage that the production of gold and the prevention of aging of the lake and swamp can be achieved at once by using both the dredging of the lake and the swamp and the collection of the gold dust.

 According to the above-mentioned invention of the present application, sand containing gold dust and the like is sucked and excavated by an air jet as a means for accelerating the flow velocity of a mixture of sand and water, a transfer pipe, and a separation box, and transferred. This has the effect of efficiently separating gold dust and the like. Therefore, there is an effect that it is possible to efficiently collect money even in a sand layer containing a relatively small amount of gold or the like, which has been conventionally neglected from the viewpoint of profitability. Further, according to the present invention, the gold dust and the like can be separated during the transfer of the mixture of sand and water containing the gold dust and the like, so that the separation process is simplified and the efficiency can be remarkably improved.

 Next, the present invention solves the problem of transporting sand by guiding a mixture of sand and water to a transfer pipe, and accelerating the mixture with a pressurized fluid (for example, pressurized air). The problem of excavating from the ground was also solved.

In other words, the method for excavating and sorting gold dust and the like proposed by the present invention is to suck and lift a mixture of sand and water containing gold dust and the like, accelerate and flow the mixture with a jet fluid, and flow the mixture. This is a method of excavating and separating gold dust, which uses the difference in specific gravity in the process to separate gold dust and the like. More specifically, a sand pipe for lifting a mixture of sand and water including gold dust and the like is inserted into a predetermined depth, and the lower end of the sand pipe is sanded. The mixture of sand and water containing sand and gold is lifted to the ground by applying suction to the upper end of the sand pipe while rushing into the layer of sand containing gold and the like. In the flowing direction, the flow rate of the mixture is changed, and the difference in specific gravity is used to separate the gold dust and the like. is there. In the above, when the lower end of the sand pipe is inserted into a layer of sand or the like containing gold dust, etc., when a layer other than a sand layer such as viscosity ± s is present, the pressurized fluid is passed through the sand pipe. Injecting from the lower end side, this crushes and perforates the clay layer, etc., and allows the sand tube to be inserted into the soil until the lower end of the sand tube enters the sand layer including gold dust etc. it can. The above-mentioned method for separating and excavating gold dust can be implemented by the following system. That is, one end of a transfer pipe for moving the mixture laterally along the surface of the ground is connected to the upper end of a sand pipe for lifting a mixture of sand and water including underground gold dust and the like. ¾1 An accelerating means for accelerating the flow of the mixture is installed in the vicinity of the junction, and a plurality of means for separating gold dust or the like utilizing a difference in specific gravity are connected in series at the tip side of the transfer pipe. This is a system for distinguishing gold dust and the like. In this case, the mixture can be automatically lifted through the sand pipe by reducing the pressure inside the upper part of the sand pipe, and the mixture can be added in the traveling direction of the lifted mixture. A configuration may be employed in which pressure air is blown out to apply pressure for accelerating the flow rate of the mixture. Means for separating gold dust and the like by using the difference in specific gravity is to change the cross-sectional area of the transfer pipe and change the flow velocity of the mixture at the place where the cross-sectional area becomes large, thereby cutting the transfer pipe. When the area becomes large, it can be configured so that gold dust and the like settle. If a configuration in which a funnel for accommodating gold dust or the like is continuously provided at a position where the gold dust or the like settles, an outlet is provided at the lower part of the funnel, and an opening / closing lid is provided at the outlet, the above-described opening and closing can be achieved. By opening and closing the lid, sedimented gold dust can be collected.

Further, if an acceleration means for accelerating the flow of the mixture is provided at an appropriate position of the transfer pipe, the transfer can be performed smoothly even if the transfer pipe is laid long. According to the present invention, a mixture of sands and water (for example, 60 to 80% moisture) is guided to a transfer pipe, and the flow of the mixture is accelerated by a pressurized fluid (for example, pressurized air or pressurized water). Even solids up to 80% of the inside diameter of the transfer pipe are acceptable. It can be made to flow easily.

 The preferred flow rate from an economic point of view when flowing the mixture is the diameter of the transfer pipe, the pressure of the pressurized fluid (eg pressurized air or water), the depth of the sand layer into which the sand pipe is inserted, In other words, the force lm to 5mZs ec that varies depending on the excavation depth is within the allowable range, and 2π! ~ 3 mZsec is a speed that can be practically used without difficulty.

 Although there is no particular limitation on the inner diameter of the transfer pipe in theory, the inner diameter of 0.3 m to 1 m is a size that does not hinder the efficiency and ease of handling.

For example, when a mixture of water and sand with 75% water content is transferred at a speed of 3 m / s through a transfer pipe with an inner diameter of 0.6 m, the following results are obtained. In 0. 84m ^3, 1 minute per second, in 50. 8m ^3, 1 hour, at 3. 052m ^3, 10 hours, would be capable of transporting substantially the mixtures of 30000 m ^3. In other words, if the water content is 75%, sand and the like can be transferred in 7,500m ³ (about 19,000 tons) in 10 hours. As mentioned above, less than 20,000 tons of sand can be excavated and transported in 10 hours. The gold dust content in the gold dust layer is remarkably wide and cannot be determined in general. However, even if 0.1% (poor ore, which is currently considered unprofitable), the system of the present invention is operated for 10 hours a day. By doing so, it is possible to collect less than 20 tons / day of gold dust.

 According to the present invention, if the sand pipe is installed vertically and the water level is 5m and the lower end of the sand pipe is 100m deep, the lower end will have a water pressure of 95m. Therefore, if the mixture of sand and water up to a depth of 25 m from the surface is sucked from the upper end of the sand pipe to remove the mixture, the mixture of sand and water is lifted by a pressure difference of 2 Om in the water column. It will rise in the pipe. At this point, the bottom depth of the sand pipe is 20 On! Even if it reaches ~ 30 Om, there is no change.If the energy for removing the mixture of sand and water at a depth of 25 m from the surface is constantly applied to the sand, a depth of 10 Om. It will be possible to continuously excavate sand layers such as Om. In other words, it is possible to excavate a layer of sand containing gold and the like that exists at a large depth with extremely low energy, and perform a separation process of the gold and the like.

According to the present invention, sand containing gold dust and the like is sucked from deep underground. While the mixture of sand and water lifted in this way is flowed horizontally by a transfer pipe, the difference in specific gravity is used to separate gold dust, etc., so that large amounts of sand can be efficiently handled. There is an effect that can be processed automatically. In addition, a mixture of sand and water can be lifted from the sand layer existing at very large depths, and gold dust can be automatically separated. It has the effect of collecting money.

 Furthermore, the present invention pays attention to the weak magnetism of gold dust and the like, and succeeds in adsorbing and separating gold dust and the like by adopting a high magnetic force, thereby making it possible to fully automate the collection, increase efficiency and reduce costs. This solves the conventional problem.

 That is, the method for separating gold dust and the like proposed by the present invention is characterized in that a mixture of sand and water containing the gold dust and the like is sent into a magnetic field, and the gold dust and the like are adsorbed and separated by magnetic force. Is what you do. That is, a mixture of sand and water containing gold dust and the like is sent into a transfer pipe generating a magnetic field, and the gold dust and the like are magnetically attached to the inner wall of the transfer pipe by a magnetic force. The mixture of sand and water is discharged to a predetermined location through the transfer pipe, and then the magnetic field is extinguished to release the magnetic adhesion of gold dust or the like to the inner wall of the transfer pipe, and the cleaning fluid is transferred to the transfer pipe. This is a method for separating gold dust and the like, which is characterized in that it is sent into a pipe, the gold dust and the like are caused to flow to a predetermined location by the cleaning fluid, and collected. In the above, the mixture of sand and water, including gold dust, and the cleaning fluid can be caused to flow in the transfer pipe by applying a fluid force by applying pressure. Further, the mixture of sand and water, including gold dust, preferably contains 70% to 90% of water, and water can be used as a cleaning fluid. The strength of the magnetic field is preferably 500 to 200,000 gauss.

The method for separating gold dust and the like can be implemented by a system described below. Mixing means for mixing a sand containing gold and the like with water to form a mixture; sending means for sending the mixture into a metal cylinder; magnetic field generating means provided outside the metal cylinder; A means for sending a cleaning fluid into the metal cylinder, a means for sending the remaining mixture from which the gold dust and the like are separated to a drainage tank, and a means for discharging a mixture of the separated gold and the like and the cleaning fluid And a separation system for gold dust etc. is there. In the above, the sending means for sending the mixture into the metal cylinder is configured to give a fluid force to the mixture by blowing a jet fluid or by a pump, and the sending means for the cleaning fluid is The structure which transfers by a pump can be used. The magnetic field generating means may include a plurality of magnetic field generating means capable of generating magnetic fields of different strengths between 500 and 200,000 gauss, and These are sequentially installed on the outer periphery of a metal cylinder along the flow direction of the object, and these multiple magnetic field generating means can be activated and stopped simultaneously, or can be individually and individually stopped. You can also.

 In the above-described system, a plurality of electromagnetic coils are sequentially installed along the flow direction of the mixture in the metal cylinder to generate magnetic fields having different strengths outside the metal cylinder. can do. For example, four electromagnetic coils capable of generating a magnetic field of 500,000, 20,000, 50,000, and 200,000 gauss are installed, and only certain electromagnetic coils are energized. It is also possible to generate a magnetic field of a specific strength, for example 500 gauss, or to generate magnetic fields of four different strengths at the same time. In the above, since gold dust is a weak magnetic particle, the weak magnetic ore containing gold dust and gold is made of metal at a site where a strong magnetic field such as 200,000 gauss or 50,000 gauss is generated. The ferromagnetic ore containing gold, which is magnetically attached to the inner wall of the cylinder, magnetically attaches to the inner wall of the metal cylinder at a site where a weak magnetic field is generated, such as 500 gauss, from the mixture. Be separated. In other words, gold dust, gold-containing weak magnetic ores, and gold-containing ferromagnetic ores are sorted separately and efficiently without interfering with each other.

More specifically, ferromagnetic particles and substances are sufficiently magnetized at 500 gauss, but gold ore formed by ferromagnetic particles and substances and non-magnetic particles and substances, etc. , Ferromagnetic particles · Since the strength of the magnetic force varies depending on the amount of the substance contained, it is magnetized at a position of 20,000 or 50,000 gauss. On the other hand, weak magnetic particles and substances such as gold dust are magnetically attached at 50,000 or 200,000 gauss. For example, non-magnetic minerals containing gold dust particles are magnetically deposited at a position of 20 gauss because the magnetic force becomes smaller. On the contrary, in the case of a ferromagnetic mineral containing gold dust particles, magnetic adhesion can be performed even at 500,000 gauss to 20,000 gauss. .

As described above, depending on the state of the gold particles in the placer and the like, the position force for magnetizing is different and the ratio is also different. In the case of gold ore in the same placer bed or the same mountain, the state of the placer is generally Since it is constant, a more efficient screening method can be adopted by conducting a screening test in advance, and the optimum magnetic field strength should be determined for the state of the particles such as gold dust. For example, a combination of 500, 10,000, 20,000, and 50,000 Gauss can be used, and other magnetic field strengths can be selected.

 For each of the electromagnetic coils that can generate magnetic fields with different strengths, if they are energized (generate a magnetic field) and interrupted (disappearing the magnetic field) separately, the metal in the area where the electromagnetic coil is attached Only the dust that has been magnetically attached to the inner wall of the cylinder can be removed with the cleaning fluid. Therefore, only weak magnetic ores containing gold dust and gold can be separated from the mixture, and only ferromagnetic ores containing gold can be separated from the mixture. Also, even if the amount of magnetism on the inner wall of the metal cylinder at the location where each electromagnetic coil is attached is different, separate operations such as energization and cutoff are performed separately. There is no risk that separation will be hindered.

 The flow of the mixture can be performed by a jet water flow or a pump. Therefore, the water can be easily sent by setting the water content of the mixture to 70% to 90%.

 ADVANTAGE OF THE INVENTION According to this invention, there is an effect which can easily and efficiently magnetize and separate gold dust from a mixture of sand and water containing gold dust and the like which are continuously fed.

 In addition, the flow of a mixture of sand and water, including gold dust, the magnetic adhesion and separation of gold dust, the flow and magnetic adhesion of cleaning fluid, and the removal of separated gold dust, etc., are all achieved automatically. There is an effect that can be done.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram of a first embodiment of the present invention, FIG. 2 is a block diagram of a second embodiment of the present invention, and FIG. Fig. 4 is a partially enlarged plan view showing the installation state of the suction pipe of the sampling vessel such as gold dust. Fig. 5 (a) is an enlarged side view explaining the adjustment of the angle of the suction pipe of the sampling vessel such as gold dust. Fig. 5 (b) is an enlarged side view illustrating the length adjustment of the suction pipe of the vessel for collecting gold dust, etc. Fig. 7 is a partially cutaway explanatory view showing an example of a jet pump for accelerating the flow velocity of an object, and Fig. 7 is a partially cutout explanatory view showing an example of a sorting box as a separation means utilizing a difference in specific gravity. Fig. 8 is an enlarged cross-sectional view showing an example of an embodiment of the separation means by centrifugal separation, in which a part is omitted. Fig. 9 is an enlarged plan view in which a part of the separation means shown in Fig. 8 is cut off. FIG. 10 is a perspective view illustrating another boat for collecting gold dust and the like according to the present invention. FIG. 11 is an enlarged perspective view illustrating the tip of the suction excavating means in the boat for collecting gold dust and the like shown in FIG. 10. 12 is a block diagram showing an embodiment of the method for excavating and separating gold dust and the like according to the present invention, and FIG. 13 is a cross-sectional view of a partly omitted excavation for explaining the system for excavating and separating gold and sand according to the present invention. FIG. 4 is a plan view of a part of the excavating and sorting system for the placer of the present invention, and FIG. 15 is a placer of the present invention. Fig. 16 is an enlarged view of a part of the embodiment of the flow velocity accelerating means in the excavation / separation system of the present invention. Fig. 16 shows an example of the separation means utilizing the difference in specific gravity in the excavation / separation system of the present invention. FIG. 17 is an enlarged view of a part cut off, FIG. 17 is an enlarged view of a lower end portion of an embodiment of a sand-lifting tube in the excavating and sorting system for gold dust and the like of the present invention, and FIG. FIG. 19 is a conceptual diagram of an embodiment of a system for separating gold dust or the like using a magnetic field according to the present invention.

 (Example 1)

 An embodiment of the present invention will be described with reference to FIG.

 A mixture of sand and water, including excavated or collected gold dust, is transferred by a transfer pipe equipped with a jet pump (for example, at a speed of l to 5 m / sec). Then, at the part where the cross-sectional area of the transfer pipe is enlarged (separation box), the difference in specific gravity is used to sort out gold dust. For example, if the cross section of the transfer pipe is increased by 20%, the flow velocity of the mixture of sand and water transported at a flow rate of 3 mZ sec is the area where the cross section is increasing. In the (separation box), 2.4 m / se (because it becomes lossy, gold dust etc. in the flowing mixture settles in the separation box. Preface HJt Separation of gold dust etc. using the difference in weight If two separate boxes are connected in series, a relatively large set of gold dust (or granular gold, etc.) will settle in the first separate box, and a second separate box will The large and small particles of gold dust, etc. are settled, and the large and small particles of gold dust, etc. are mixed, or each is collected to form a gold dust product. The excavated water bottom can be reclaimed.

0 one (Example 2)

 Another embodiment of the present invention will be described with reference to FIG.

 A mixture of sand and water containing excavated or collected gold dust etc. is transferred from the bottom of the water using a transfer pipe equipped with a jet pump. Then, the mixture is placed in a cyclone and centrifuged, and the mixture separated by force such as gold is returned to water again, and the separated gold is collected and used. According to the cyclone of this embodiment, due to the difference in specific gravity, gold dust and the like settle down along the inner wall of the cylindrical outer tank, and the other parts settle near the center of the cylindrical outer tank.

 (Example 3)

 Another embodiment of the present invention will be described with reference to FIGS. 3, 4, 5, 6, 7, and 8. FIG.

 The base of the suction pipe 2 is movably attached to one side of the hull 1, the tip of the suction pipe 2 is protruded from the hull 1, and one end of the hose 3 is connected to the base of the suction pipe 2, The other end is connected to the jet pump 4. The jet pump 4 has a blow-out hole 6 for pressurized air near the connection between the hose 3 and the transfer pipe 5, and the pressurized air is supplied by an air pipe 8 connected to an air box 7 (FIG. 6). Sorting boxes 9 and 10 are arranged in series at a predetermined interval in the transfer pipe 5 (FIG. 3), and a discharge hose 11 is connected to the discharge side of the last sorting box 10. The discharge hose 11 projects outward from the stern of the hull 1.

In this embodiment, when the rod 12 fixed to the base of the suction pipe 2 is moved in the direction of arrow 14 or 15 by supplying and discharging pressurized air to the air cylinder 13 (FIG. 4), the suction pipe 2 also moves in the same direction, so the tip of the suction pipe 2 can be arranged so that it can excavate a layer of sand with the same width as the hull 1. Regarding the depth of the tip of the suction pipe 2, for example, the angle is adjusted as shown in Fig. 5 (a), the suction pipe 2 is divided into an outer pipe 2a and an inner pipe 2b, and the outer pipe 2a is By sliding and lengthening, it is possible to excavate from ± ϋ to the lower layer of sand at the river bottom. If the air cylinder 16 is fixed on the pipe 2b and the outer pipe 2a is fixed to the rod 17 end of the air cylinder 16, pressurized air can be sent to the base end of the air cylinder 16. Thus, the rod 17 is extended in the direction of the arrow 18, and the sand from the JJll 9 a of the sand layer 19 to the lower layer 19 b can be excavated. In addition, the moving table 21 is erected on the rail 20 on the hull 1 and the suction pipe 2 is rotatably supported on the bracket 2 2 of the moving table 21 so as to be rotatable around the shaft 23. Also, if the base end of the air cylinder 24 is mounted on the movable table 21 and the tip of the rod 25 of the air cylinder 24 is mounted on the suction I-pipe 2, the air cylinder 24 is pressurized. The air supply / discharge moves the head 25 in the direction of arrow 26 or 27, and rotates the suction pipe 2 in the direction of arrow 28 or 29 about the axis 23. be able to. In this way, the suction pipe 2 can change its angle or adjust its length.

 Next, in FIG. 6, pressurized air is supplied to the air pipe 8 of the jet pump 4, and the pressurized air is blown out from the blowout hole 6 as shown by an arrow 30. The mixture is accelerated in the same direction, for example, in the direction of arrow 31 at a flow rate of 3 mZ sec. Then, when reaching the sorting box 9, the cross-sectional area of the transfer pipe 5 is increased in the portion of the sorting box 9, so that the flow velocity of the mixture is reduced. Therefore, gold dust contained in the mixture, especially relatively large gold dust, cannot flow at the same speed as before, and therefore sedimentation as shown by arrow 32 due to its specific gravity. (Fig. 7). Then, from the mixture that has reached the sorting box 10, relatively small particles of gold dust are settled.

 As described above, the placer and the like are almost separated in the sorting boxes 9 and 10. The sorting accuracy varies depending on the condition of the gold dust etc. (external shape, particle size, etc.) and the degree of change in the flow velocity. However, if necessary, the number of sorting boxes can be increased or the flow velocity can be greatly changed. . The gold dust 33 accumulated in the sorting box as described above can be taken out to the outside world as shown by arrow 35 by opening the door 34 (FIG. 7).

 (Example 4)

 The present invention will be described with reference to FIGS.

 The transfer pipe 37 is connected to the upper side wall of the cylindrical outer tank 36 from the tangential direction and obliquely downward. At the lower part of the cylindrical outer tank 36, an inner tank 38 is installed at a slight distance from the inner wall of the cylindrical outer tank 36, and at the lower part of the cylindrical outer tank 36, A funnel-shaped part 39 is provided continuously, and an opening / closing lid 40 is provided at the lower end. A funnel-shaped portion 41 is continuously provided at the lower end of the inner tank 38, and an opening / closing lid 42 is provided at the lower end.

In this embodiment, as shown in arrow 43 from the transfer pipe 37, sand containing gold dust or the like When a mixture of water and water is blown under pressure (for example, at a speed of 5 m / s), the mixture spirals along the inner wall of the cylindrical outer tank 36, so that particles having a high specific gravity (such as gold dust) in the mixture Settles along the inner wall of the cylindrical outer tank 36 and accumulates in the funnel-shaped part 39. In addition, particles having a low specific gravity (other than gold dust, etc.) settled in the center relatively as shown by arrow 44 and accumulated in the funnel-shaped portion 41, which was passed through the drain pipe 45 together with the water, as indicated by arrow 44. It is discharged to the outside as shown in 4. Therefore, the centrifugation by the cylindrical outer tank 36 is performed smoothly and continuously.

 The open / close lids 40 and 42 can be opened as appropriate to take out the settled gold dust or the like.

 (Example 5)

 The present invention will be described with reference to FIGS. 10 and 11.

 The base of the suction pipe 51 is rotatably attached to the bracket 52 on the bow side of the hull 50, and is connected to one end of the transfer pipe 53.The transfer pipe 53 passes through the pump chamber 54, Separate boxes 5 5, 5 6, 5 7 are connected in sequence, and box 5 7 is connected with discharge hose 58.

 An excavating blade 49 and a suction box 47 having a sorting net 48 behind the excavating blade 49 are connected to the end of the suction pipe 51.

 In the above embodiment, when a transfer pump (or a jet pump) imparts a fluid force to the water in the transfer pipe 53 in the direction of arrow 59, sand is drawn from the suction box 4 as shown by arrow 63. The mass 60, which is sucked and is larger than the mesh of the sorting net 48, falls out of the net as indicated by arrow 61. In this case, since the guide ridge 62 guides the large lump, there is no danger of staying on the net. The sand that has passed through the ii ^ ij net 48 in this way enters the transfer pipe 53 from the suction box 47 via the suction pipe 51 as shown by arrow 63, and further as shown by arrow 64. After passing through each sorting box 55, 56, 57 in order, it is discharged from discharge hose 58 as shown by arrow 65. The hull 50 is fixed to the bottom of the water as required, or the suction operation is continued while moving forward at a very low speed.

As described above, the mixture of sand and water that has passed through the transfer pipe 53 is described in Example 3 with reference to FIG. 7 by utilizing the difference in specific gravity in the sorting boxes 55, 56, and 57. As it did, it was separated, so it settled on the Chita side of the sorting box 55, 56, 57, and the deposited gold dust etc. Secondary separation, tertiary separation even without, is in monkey _c be collected as good gold dust or the like quality

 (Example 6)

 An embodiment of the method of the present invention will be described with reference to FIGS. The underground sand layer 66 is excavated by suction, lifted to the ground surface 68 with a sand lifting pipe 67, and transferred to a transfer pipe 69 laid along the ground surface 68. The transfer pipe 69 is provided with an accelerating device for accelerating the flow speed of the mixture of sand and water including gold dust by pressurized air, and moves the mixture at, for example, 3 mZ sec. be able to. Separation boxes 70 and 71 for separating gold dust and the like by utilizing the difference in specific gravity are arranged in series at predetermined intervals in the transfer pipe 69. Separation boxes 70 and 71 are not limited to two, and the number of them to be installed is determined in consideration of the flow velocity fluctuation amount so that the separation of gold dust etc. using the difference in specific gravity can be performed efficiently. . Sorting of gold dust or the like using the difference in specific gravity in the sorting boxes 70 and 71 can be performed as described in Embodiment 3 with reference to FIG.

 If the separation is carried out by utilizing the difference in specific gravity as described above, it can be separated into water and gold dust, and if necessary, the sand can be separated according to particle size. The gold dust etc. will be packaged and sold to a certain amount or transported to the next process.

 (Example 7)

 An embodiment of the system according to the present invention will be described with reference to FIGS. 13, 14, 15, 16 and 17. FIG.

A sand pipe 67 is inserted into the ground from the ground surface 68, and the sand pipe 67 is connected to the transfer pipe 69 laid on the ground by a connecting pipe 73. The connecting pipe 73 is provided with a pressurized air box 74 at the bent portion thereof, and supplies the pressurized air generated by the compressor 76 to the pressurized air box 74 through the air pipe 75. From 7, the pressurized air is blown into the connecting pipe 73 as shown by arrow 78 to accelerate the flow velocity of the mixture of sand and water, including gold dust, in the transfer pipe 69, and Flow at the speed (for example, 3 mZ sec). Therefore, when a flow like the arrow 78 in Fig. 13 occurs in the transfer pipe 69, an upward flow like the arrow 79 also occurs in the sand pipe 67 through the pipe 73. . When a flow of 3 mZ sec occurs in the transfer pipe 69, a uniform velocity flow also occurs in the sand pipe 67, and the flow amount from the lower end of the sand pipe 67 becomes Sand including suitable gold dust A mixture of water and water is excavated.

 In the above, since the water pressure of H is applied between the lower end of the sand pipe 67 and the water level 80 (FIG. 13), the mixture in the sand pipe 67 between the water level 80 and Xm downward is applied. If the water pressure of H and the water pressure between Xm are eliminated, the lower mixture is automatically replenished to the section, and eventually the sand-lifting state is continued and continued. Suction and excavation Ά.

 In the above, if the layer of sand containing gold dust and the like is under strong pressure and is subject to a force higher than the water pressure due to the depth, without using an acceleration device such as pressurized air as described above In other words, the upper end of the sand pipe 67 is sucked and decompressed, and the sand is automatically compressed from the lower side of the sand pipe 67 by pressure difference without pressure. If a hole is formed in the sand layer, a mixture of sand and water may well blow out, but in this example, it is described that there is no other than a hydraulic head. Separation boxes 70, 71, and 72 are connected in series to the transfer pipe 69 at predetermined intervals. Since the inside of the separation box 70, 71, 72 has a cross-sectional area larger than the cross-sectional area of the transfer pipe 69, the separation box 70, 71, 72 is proportional to the cross-sectional area. The flow velocity decreases in the provided area, and as the flow velocity decreases, gold dust, etc., having a higher specific gravity, first settles, and then sedimentation begins with those with higher specific gravity and can be separated. . Since the relationship between the flow velocity and the separation using the difference in specific gravity is related to the shape, particle size, etc. of the gold dust or the like, the method obtained experimentally can further improve the separation efficiency. After passing through the separation box 70, 71, 72, it is possible to use other separation means (for example, centrifugal separation, "^ elutriation"). If it is a facility that can be used, it seems preferable to separate only by using a separation box.

 In this example, if the tip of the sand pipe comes into contact with the clay layer or rock layer when inserting the sand pipe, as shown in Fig. 17, a jet nozzle 81 is attached to the tip of the sand pipe 67. Is fixed downward, and high-pressure water is blown out from the jet nozzle 81 through a pressure-resistant pipe 82, whereby the clay layer 83 or a rock layer is easily crushed and pierced, and the sand pipe is inserted into the soil. You can let it go.

(Example 8) An embodiment of the present invention will be described with reference to FIG. 85% (by weight) of water is added to gold dust or the like obtained by excavating a gold dust bed or crushed sand obtained by crushing gold ore to form a mixture, and the mixture is pumped or pressurized fluid ( A fluid force is applied using a pressurized air or a pressurized water jet, and the fluid is fed into a metal cylinder via a feed pipe (for example, sent at a speed of lmZ sec). If the cross-sectional area of the metal cylinder is set to be 10 times the cross-sectional area of the flow pipe, the flow rate of the mixture in the metal cylinder will be 10 cmZ sec. Around the metal cylinder, magnetic field generating means (for example, a solenoid coil) that generates magnetic fields of different strengths of 500, 20,000, 50,000, and 200,000 Gauss are placed inside the metal cylinder. The mixture is placed sequentially along the flow direction of the mixture.

 By operating the magnetic field generating means, the metal cylinder is slowly rotated (5 to 10 rotations per minute) while generating a magnetic field. In this way, the ferromagnetic particles and ferromagnetic material (eg, Fe, Mn, etc.) magnetically attach to the inner wall of the metal cylinder corresponding to the position where a magnetic field of 500 Gauss is generated, and the mixture Depending on the magnetic strength of the gold dust and ore contained in the inside, the metal cylindrical inner wall corresponding to the position where the magnetic field force of 20,000, 50,000, and 200,000 Gauss is generated, respectively However, gold dust and ores are magnetized.

In the above, immediately before the magnetic adhesion of the placer or the like in the metal cylinder becomes saturated, the power supply to the magnetism generating means (for example, a solenoid coil) is cut off, the magnetic field is extinguished, and the cleaning fluid is made of the metal. If it is pressurized and sent into the cylinder (for example, it is sent at a pressure of 1 O kg / cm ² ), the gold dust or the like magnetically adhered to the inner wall of the metal cylinder will be removed together with the cleaning fluid together with the metal cylinder. It is taken out.

 In the above, if the magnetic adhesion of only one or two solenoid coils at which the magnetic coil is installed reaches saturation (for example, by using a timer to automatically operate), the energization of only the solenoid coil in the relevant section is stopped. By removing the magnetic field, the magnetically deposited gold dust can be removed.

 Also, even if the magnetic field of 50,000 Gauss becomes saturated, it magnetizes to the next magnetic field of 20,000 Gauss, and when it becomes saturated with the magnetic field force of 20,000 Gauss, it magnetizes to the magnetic field of 50,000 Gauss, etc. Since it is automatically adjusted, it can be seen that the magnetic force is exerted as long as the mixture discharged through the metal cylinder part does not contain gold dust or the like.

6 one Originally, the distribution of material such as gold dust mixed in from the gold dust floor was known in advance, and the content and quality of the gold dust etc. could be determined by conducting separation in advance, so the saturation of the magnetized material Can be automatically controlled by a timer.

 In the above, when operating the magnetic field generating means while flowing the mixture, the metal cylinder was slowly rotated, but without rotating, the metal dust or the like in the mixture was magnetically attached to the inner wall of the metal cylinder and separated. be able to.

 The gold and the like collected and separated by the method and the system described in the first to seventh embodiments are mixed with water to form a mixture. If the gold is further separated by the method described in this embodiment, the gold and the gold are separated. Ore can be separated with high accuracy and high efficiency.

 (Example 9)

 The system of the present invention will be described with reference to FIG. An appropriate amount of water (for example, 85% (fi »)) is added to the dust obtained by crushing gold dust or gold ore to form a mixture. The mixture is supplied from a tank 84 to a metal cylinder 8 by a pump 85. Feed into 7. In this case, if valves 88, 89, 90, 91 are opened and valves 92, 93, 94, 95, 105 are closed, the mixture will Into the metal cylinder 87. The metal cylinder 87 is made of stainless steel, and a plurality of sets of solenoid coils 100, 100a, 100b, and 100c are sequentially provided on the outside. The solenoid coils 100, 100a, 100b, and 100c are arranged such that the magnetic force increases as they go downstream of the mixture flowing. For example, the solenoid coil 100 is 500 gauss, the solenoid coil 100a is 20,000 gauss, the solenoid coil 100b is 50,000 gauss, the solenoid coil 100 c is 200 gauss, and the solenoid coil 1 The widths of 00, 100a, and 100b are almost the same, and the width of the solenoid coil 100c is twice or more. Accordingly, relatively ferromagnetic gold dust (eg, gold dust particles fixed to iron particles) is used in the metal cylinder 8 where the solenoid coil 100, which generates a magnetic field of 500 gauss, is located. 7 Weakly magnetized gold dust (such as gold dust particles and gold dust particles with non-magnetic minerals adhered to the inner wall) is magnetized on the inner wall of the solenoid coil 100 c that generates a magnetic field of 200,000 gauss. Part of the metal cylinder 8 7 is magnetized on the inner wall.

In the above, the metal cylinders 87 and 87a are slowly rotated (5 to 10 rotations per minute). When the magnetic field is generated by the solenoid coil 100 and the like while the mixture is flowing through the metal cylinders 87 and 87a, the metal cylinders 87 and 87a are slowly rotated (5 to 10 rotations per minute). ). In this way, it is possible to uniformly magnetize the inner peripheral walls of the metal cylinders 87, 87a with gold dust or the like.

 As described above, all of the weak magnetic placer gold, the placer gold adhered to the ferromagnetic mineral (for example, iron), the placer gold adhered to the ferromagnetic mineral, etc. The magnet is completely magnetized on the inner wall of the metal cylinder 87 where the 100 a, 100 b, and 100 c are installed, and separated from the mixture. The remaining mixture from which the placer and the like have been removed is supplied to the valve 89, as indicated by arrows 102, 103 and 121.

After 90 and 91, it accumulates in the discharge tank 104. When the magnetically deposited gold or the like on the inner wall of the metal cylinder 87 becomes saturated, the valves 88 and 90 are closed (for example, according to the instruction of a timer), while the valves 105 and 95 are opened, and the valves 86 and 86 are opened. 96,

When 106 is closed, the mixture enters the metal cylinder 87a as shown by arrows 97, 117, and 118, and the dust contained in the mixture is magnetically attached. After passing through 91, it is accumulated in the discharge tank 104 as indicated by arrows 119, 120 and 121.

At this time, when the valves 94 and 92 are opened and the pump 107 is started, it is pumped from the fresh water tank 108 for cleaning as shown by arrows 109, 110, 11, and 112 (for example, 10 kg / cm ² ), The mixed solution in the metal cylinder 87 is returned to the tank 84. When the liquid mixture is returned in this manner, the valve 92 is closed, the valve 93 is opened, and the current of all the solenoid coils 100, 100a, 100b. After demagnetizing all the solenoid coils provided on the metal cylinder 87 in this way and eliminating magnetized metal such as gold dust, the pump 107 feeds fresh water under pressure, and is magnetized on the inner wall of the metal cylinder 87. The gold dust and the like that flowed together with the fresh water flow as shown by arrows 110, 11, 113, and 114 and are sent to the collection tank 115. Thus, one step of magnetically separating and collecting the gold dust and the like is completed.

On the other hand, if the magnetic adhesion of gold or the like has reached a saturated state in the metal cylinder 87a (this is known from the timer. Also, at this point, the metal It is preferable that the water is washed off by fresh water and sent to the collection tank 115. ), While closing valves 93, 94, 95, 105, and opening valves 88, 90, the mixed liquid is fed to the metal cylinder 87 by the pump 85 as in the beginning, Gold dust or the like is magnetically attached to the inner wall of the metal cylinder 87, and the remaining mixture is discharged to the discharge tank 104.

 When the valves 86 and 96 are opened and the pump 107 is started, fresh water is sent from the water tank 108 into the metal cylinder 87 a as shown by arrows 109 and 116. Further, the mixture remaining in the metal cylinder 87a is returned to the tank 84 as shown by arrows 122, 123 and 112. Once the mixture in metal cylinder 87a has been cleaned in this manner, valve 86 is closed, valve 106 is opened, and all solenoid coils 100, 100 of metal cylinder 87a are opened. When the power of a, 100b, and 100c is turned off, the magnetism is lost and the magnetic force of the metal cylinder 87a is lost. Accumulate at 1 1 5

 The mixture in the collection tank 115 collected as described above is separated into a solid and a liquid, and only the gold dust is taken out and packed as appropriate.

 In this embodiment, in the metal cylinder 87 or 87a, all the gold dust or the like magnetically attached to the inner wall of the metal cylinder at a position corresponding to the portion where each solenoid coil was provided is simultaneously cleaned. However, the magnetic field of each solenoid coil can be individually demagnetized, and the magnetized material can be taken out separately for each installation location of each solenoid coil.

 For example, depending on the anvil, if there is a large amount of iron sand or other ferromagnetic particles, a solenoid coil generating a magnetic field of 500 Gauss 100 Metal cylinder 87 7 or 8 The ferromagnetic particles are magnetically attached to the inner wall of 7a, and the weak magnetic gold dust generates a magnetic field of 50,000 gauss or 200,000 gauss. Since it is magnetized only on the inner wall of the metal cylinder 87 or 87a, if only the solenoid coils 100b and 100c that generate a magnetic field of 50,000 or 200,000 gauss are demagnetized, Only gold dust can be collected and automatically separated from ferromagnetic particles.

Note that, after the final step of the method and system described in the above Examples 1 to 7, The system described in the embodiment is combined, and the gold dust and the like collected and separated by the system are mixed with water to form a mixture, which is further separated by the method described in the first to seventh embodiments. By doing so, gold dust and gold ore can be separated with higher accuracy and higher efficiency.

Claims

The scope of the claims  1. Suction and excavation of a layer of sand containing gold dust etc. existing below the water surface, transport it at a desired speed, and use a means to separate gold dust etc. using the difference in specific gravity. A method of collecting gold dust, etc., specializing in collecting gold.  2. The method of separating gold dust, etc. using the difference in specific gravity is to change the flow velocity during the transfer of a mixture of sand and other sand containing gold, etc., to settle and separate the heavy gold dust, etc. The method for collecting gold dust and the like according to claim 1, wherein  3. The method of separating gold dust etc. by using the difference in specific gravity is to apply a centrifugal force to a mixture of sand and other water containing gold dust, etc., and to separate gold dust, etc. having a large specific gravity from other materials. 2. The method for collecting gold dust according to claim 1, wherein:  4. The method according to claim 1, wherein the means according to claim 2 and the means according to claim 3 are used in combination as means for separating gold dust or the like using the difference in specific gravity.  5. It is a special feature that the ship's hull is connected to the suction digging means, the pipe transfer means, the means for separating gold dust using the difference in specific gravity, and the means for discarding the remaining sand separated from the gold dust. A boat for collecting gold dust.  6. The suction and excavation means is to insert one end of the suction pipe into a layer of sand containing gold dust, etc., and to transfer the other end with acceleration means for accelerating the flow speed of the mixture of sand and water. 6. The TO for collecting gold dust or the like according to claim 5, wherein the TO is connected to a pipe.  7. The pipe transfer means according to claim 5, characterized in that a pressurized fluid blowing nozzle is opened inside the transfer pipe to accelerate the transfer speed of the mixture of sand and water in the transfer pipe. Gold duster.  8. The means to separate gold dust etc. by using the difference in specific gravity is to cut off the pipe to a part of the transfer pipe! ^ Connect a separating box with a larger cross-sectional area and use the decrease in flow velocity in the separating box. 6. The vessel for collecting gold dust and the like according to claim 5, wherein the vessel is to settle gold and the like.  9. The method according to claim 5, wherein the means for separating gold dust and the like by utilizing the difference in specific gravity is obtained by interposing a centrifugal separation means on a part of the transfer pipe. 10. The centrifugal separation means is used to separate sand and water, including gold dust, from the tangential direction on the cylindrical outer tank wall. -2 The mixture is pressurized and blown, and the mixture is spirally swirled along the inner wall of the cylindrical tank, and the mixture is distributed in and out of the cylindrical tank according to the difference in specific gravity. A vessel for collecting gold dust or the like according to claim 9, characterized in that:  1 1. The means for separating gold dust and the like by utilizing the difference in specific gravity is characterized in that the means described in claim 8 and the means described in claim 9 or 10 are used in combination. The listed gold panning vessel.  1 2. A mixture of sand and water, including gold dust, is suctioned and lifted to the processing position, accelerated by a jet fluid to flow through the pipe, and the difference in specific gravity during the flow of the mixture is reduced. An excavation and separation method for gold dust and the like, characterized in that gold dust and the like are separated using the method. 1 3. Insert a sand pipe for lifting a mixture of sand and water containing gold dust and the like into a predetermined depth, make the lower end of the sand pipe rush into a layer of sand containing gold and the like, and The mixture of sand and water, including gold dust, is lifted to the ground by applying suction to the upper end of the sand pipe, and then the mixture is moved laterally on the ground. A method of excavating and sorting gold dust, characterized by changing the moving velocity and using the difference in specific gravity to remove gold dust by 3U.  1 4. Connect one end of a transfer pipe that moves the mixture horizontally along the surface of the ground to the upper end of a sand pipe that lifts a mixture of sand and water including underground gold dust, etc. It is characterized in that an accelerating means for accelerating the flow velocity of the mixture is installed in the pipe, and a plurality of means for separating gold dust or the like by utilizing a difference in specific gravity are connected in series at the tip side of the transfer pipe. Excavating and sorting system for gold dust.  1 5. By reducing the pressure inside the upper part of the sand pipe, the mixture of sand and water, including gold dust, can be automatically lifted in the sand pipe according to the reduced pressure, and lifted. A pressurized fluid is blown out in the direction of travel of the mixture, pressure is applied to accelerate the flow rate of the mixture, and the cross-sectional area of the transfer pipe is changed. 15. The system for excavating and sorting gold dust or the like according to claim 14, wherein the flow velocity of the mixture is changed, and the flow velocity of the mixture is changed to a speed at which the gold and the like can settle at that location. 1 6. It is characterized in that a funnel for accommodating gold dust, etc. is connected in series at the position where gold dust, etc. settles, an outlet is provided at the lower part of the funnel, and an opening / closing lid is attached to the outlet. Contract A gold dust digging and sorting system according to claim 15.  1 7. A method for separating gold dust and the like, characterized in that a mixture of sand and water containing gold dust and the like is sent into a magnetic field, and gold dust and the like are separated by magnetic force.  18. The method according to claim 17, wherein the mixture contains 70% to 90% of water.  19. The method for separating gold dust and the like according to claim 17, wherein the strength of the magnetic field is from 500 to 200,000 Gauss.  20. Mixing means for mixing sand and other water containing sand with water to form a mixture, sending means for sending the mixture into a metal cylinder, and magnetic field generating means provided outside the metal cylinder Means for sending a cleaning fluid into the metal cylinder; means for sending a mixture of sand and water remaining separated by force such as gold dust to a drainage tank; and cleaning with separated gold dust and the like. A system for separating gold dust or the like, characterized in that the system is connected to means for discharging a mixture with a working fluid. 2 1. The means for sending a mixture of sand and water containing gold dust and the like is by jetting jet fluid, and the means for sending the cleaning fluid is transported by a pump. Sorting system for gold dust etc. described in 0.  2 2. The magnetic field generation means is composed of a plurality of electromagnetic coils that can generate magnetic fields of different magnitudes around the outer circumference of a metal cylinder, and the flow of a mixture of sand and water, including gold dust, etc., inside the metal cylinder. 22. The system for separating gold dust and the like according to claim 21, wherein the electromagnetic coils are separately installed along the direction so that each electromagnetic coil can be individually controlled.