DE1215615B - Process for sorting a non-magnetic, weight-differentiated solid mixture - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

Number:
File number:
Registration date:
Display day:

B03d

German class: Ic-1/01

1 215 615
M38976VI a / lc
September 16, 1958
May 5th 1966

The invention relates to a method for sorting a non-magnetic weight differentiated Mixture of solids with a particle size between 6.0 and 0.074 mm in a separating beet a magnetically conductive heavy material, which is partly on the surface of the bath, partly in a separating container is introduced at a point below the separation zone and one that decreases from bottom to top Has weight.

There are known methods of the aforementioned type in which the sink debris from the lower end of the The separation container is removed intermittently in order to cause vertical pulsations in the separation beet, on the one hand, the maintenance of a weight of the separating beet that decreases from bottom to top opposes and on the other hand makes continuous work impossible.

Furthermore, a method is known in which the sorting takes place in several sink separators, which with unstable heavy liquids are operated. The heavy liquid circulations are according to amount and Maintain weight by crossing them at an altitude corresponding to their weight a common heavy liquid collection container are performed, in which with the supply of Heavy liquid of constant weight and quantity a state from top to bottom steadily increasing weight is maintained. This known method of maintaining the Heavy fluid circulations according to quantity and weight for several operated with unstable heavy fluids Sink separator is therefore not comparable with processes to which the invention relates.

The purpose of the invention is to create a sorting process of the type mentioned at the outset in which the Floating material and the sinking material can be removed continuously and that due to an increased Separation speed more economical and with a higher efficiency than the known processes works and is particularly suitable for sorting non-magnetic weight differentiated solids small particle sizes are suitable.

According to the invention, a sorting process of the type mentioned at the outset is characterized in that a separating beet with a specific gravity which is smaller than the specific gravity of the particles forming the floating material is used, at the point below the separating zone, separating beet is fed into the bath in such an amount that the heavy particles are deflected downwards from the area of the introduction point and an upward movement of the otherwise quiet starting at the introduction point is not
Magnetic weight-differentiated solids mixture

Applicant:

Mineral Processing Corporation,

West Pittston, Pa. (V. St. A.)

Representative:

Dr. E. Wiegand

and Dipl.-Ing. W. Niemann, patent attorneys,

Hamburg 1, Ballindamm 26

Named as inventor:

Samuel Barron,

West Long Branch, N. J .;

Joseph Ross Pagnotti, Old Forge, Pa. (V. St. A.)

Claimed priority:
V. St. ν. America 19 September 1957
(685 000)

gen bath is caused by which the viscosity gradient of the separating beet is kept constant and the particles constituting the floating material are kept in a suspended state while the sinking material is suspended together with part of the separation beet through an opening provided on the bottom of the separation vessel is continuously withdrawn through it, as is known per se.

The method according to the invention is hereinafter in connection with the drawing on a Embodiment described in more detail.

F i g. 1 is a schematic representation of a plant for carrying out the method according to FIG Invention;

F i g. Fig. 2 is a sectional view, on an enlarged scale, of the separation container.

The method according to the invention is described below in its application to sorting a solid mixture of fine anthracite coal particles with a particle size of about 1.2 mm and a specific weight below 1.70 and a waste material (mountains) with a slightly larger specific weight under

609 567/209

3 4

Turning a separating beet with a magnetic The coal is made up along with some water

conductive heavy material made of magnetite particles with a magnetic separator 22 via a line 30 from the

A weight of 5.0 and a particle size of less plant are brought out and the waste is collected together

can be explained as 0.044 mm in water. with some water via a pipe 31 from the

The non-magnetic weight difference to be sorted is brought out.

limited solid matter, which is separated from the magnetic separators 22 and 28 via a chute 11

is fed, is together with the separating beet, given heavy magnetite, which is in an addi-

which is supplied via a line 12, is in an aggregated state, is conveyed via line

conical separating container 10 at its upper lines 33 and 34 fed to a stirred vessel 35, in

Brought in at the end. io which he means with vigorous stirring with water

The separation pulp is prepared with such a ratio of a stirrer 36 driven by a motor 37 of water to magnetite that its specific gravity is subjected to bring the magnetite back into a dispersed state, both smaller than the specific gravity of the coal particles as a yawed state. The recovered also smaller than the weight of the waste particles of the separating beet goes out of the stirred vessel 35 over a mixture. As a result, the buoyancy forces 15 are line 38 to a storage container 39 in which you the separation pulp is not large enough to allow the lighter ones to float additional coal particles via a line 45 or in which water is added. To keep an outlet line 40 floating. Therefore, in the separating container, the storage container 39 is bound by a pump 41, 10, an additional force of sufficient magnitude and which generates the separating pulp via the lines 12 and 16 in the direction that together leads the buoyancy forces 20 back into the separating container 10,
The separation pulp is sufficient to keep the coal particles in suspension for the magnetically conductive heavy material, but is not sufficient, separation pulp is some kind of magnetizable material to allow the heavy waste particles to float. like magnetite, ferrosilicon or an iron alloy, this additional force leaves one suitable in the sludge. The choice of the magnetically conductive heavy upward current arise as shown in FIG. 1 by 25 fabric depends on the desired density and which the arrow 15 is indicated. It should be noted that the viscosity of the separation beet, as well as of its liquid in the container, depends in a substantial amount on its cost, its permeability and its stability. borrowed quiet state is located. The mean particle size of the heavy

The material formed by the light coal particles should be finer than the mean particle size of the

Floating material and part of the separation pulp will be in 30 non-magnetic solids to be separated,

Usually above from the conical separating A milled product, which is mainly magnetic

container 10 delivered through a weir. It becomes every conductive heavy material with a particle size below

but a special technique used to contain that of 0.044 mm is satisfactory,

The sedimentation rate of fine particles in

to remove from the separation container. The sediment flowing through a separating beet decreases with increasing

through a relatively small opening 14 on the weight and viscosity of the separating beet. Would a

Bottom of the separation container 10 together with a separation beet with a weight between the weights

Part of the separating beet, which via a line 16 in the light and heavy components of the to

the container 10 ends at a mixture separating below the separation zone, then one would be

lying position is introduced. The amount of the included 40 separation of fine particles is not possible. Through the

The separation beet carried out is equal to the amount of the liquid using a separation beet with a specific gravity that

sigkeit, which is withdrawn from the opening 14, smaller than the weight of the floating material forming

so that there are no particles in the separation zone of the container, both the viscosity and

upward movement of the separating beet takes place. the specific gravity is reduced, whereby the weaning speed

The entire float fraction, which increased 45 density and made the separation possible

Coal, magnetite, and water is made up of one being will.

Line 18 directly to a dilution. According to the invention, the speed tank is also used 20 led, in which water added speed of the separation of the light and the heavy is used to disperse the solids in the liquid through a novel combination of pouring and to form a mud. The entire downward current and sink and swim effects Sludge is then increased via a line 21. In particular, the heavy particles Magnetic separator 22 of sufficient capacity causes it to drop faster by increasing the viscosity like fed to the magnetite from the not and the specific gravity of the beet according to the above magnetic coal particles and most of the description will be reduced in size. The separating beet to separate the water. The 55 in the container 20 is caused in the separating container 10 to be abducted Water dilutes the mass and prevents the particles from sinking upwards that the magnetically conductive heavy particles move to exert a force that is straight Enclose coal particles and thereby the good enough to work together with the buoyancy of the Inhibit segregation in the magnetic separator 22. To ensure that only the light partial

Those removed from the conical separating container 10 are kept in a suspended state. Which given sink fraction, which continues to transport waste, magnetite and upward moving liquid Contains water, the light particles are removed from the separation tank via a line 25, another dilution container 25 and in It is necessary to treat the sinking material without disturbing the Aufnäuchnn. Water is added to the separating beet from the separating vessel given, and the diluted mass goes over a 65 to remove. Therefore, the sinking material will not with the Line 27 to a magnetic separator 28, in order to remove the separation beet which passes through the separation zone Magnetite from the waste and most of it has passed through it, as this sludge separates itself from emergency water to separate. maneuverable down to the discharge opening

against the bath moving upwards would have to move, which would lead to the generation of eddies would. As stated above, an amount of the separation beet is sufficiently below the separation tank fed to the separation zone. This separating beet directs the heavy particles out of the area of the point of introduction of the separating beet down towards the am Outlet opening located at the bottom of the separating container through which the sinkings together with a part of the separation beet is continuously withdrawn.

The following example of the extraction of an anthracite coal of extremely fine particle size from a mixture with waste (mountains) illustrates how the process works.

Raw coal with an ash content of 33.30% and the following percentages of the Particle size

Particle

larger than 0.50 mm 0.50%

larger than 0.25 mm 36.15%

greater than 0.177 mm 26.10%

greater than 0.149 mm 13.00 «/ o

greater than 0.074 mm 17.50%

smaller than 0.074 mm 6.75%

was introduced by means of a chute into the conical separation container at a rate of 28 t / h. Separation pulp with a density of 1.35 which had run through the system for about 10 minutes is, was fed to the same chute at a rate of 170 l / min, and the The mixture of coal and separating beet became somewhat in the separating beet located in the separating container released below the surface. The separation beet introduced at the top of the separation container was prepared from an aqueous suspension of magnetite, in which 90% of the magnetite of one particle size below 0.044 mm and the remaining 10% a particle size above 0.044 mm and below 0.074 mm had.

Separation beet of the same density of 1.35 was placed in the lower section of the conical separation container introduced at a rate of 570 l / min, causing an upward movement of the Heavy liquid was generated in the separation tank. A state of equilibrium was reached within a few minutes reached, and the density of the heavy liquid was about 1.15 at the top of the container and at the bottom 1.50.

The light coal particles flowed with separating beet over the weir at the upper end of the conical Separation container and were immediately transferred to a Magnetic separator delivered. In this case, no water was added because of dilution was unnecessary. The dilution tank only served as a feed funnel to the magnetic separator. The magnetic separator discharged water and coal free of magnetite particles at one speed from 16.5 t / h. The heavy material sludge was immediately removed from the magnetic separator with a density of 2.1 dispensed into a dispersing tank.

The heavy waste particles were separated with beet through an opening about 32 mm in diameter dispensed through the bottom of the conical separation container into a dilution container, to which water was added to reduce the bulk density to 1.25. From the In the dilution container, the material was fed directly to the waste magnetic separator, which on the one hand waste particles that were free from magnetite particles, and on the other hand heavy sludge submitted.

The heavy sludge discharged from the waste magnetic separator was put into the dispersing tank

ίο led where he was with the one from the carbon magnetic separator discharged heavy sludge was combined and subjected to vigorous stirring. the end From the dispersing tank, the material went directly to a storage tank, where water was used a float-controlled valve was added. The level of the separation beet in the storage container was kept constant, and the separating beet was with a density of 1.35 in the conical Separation tank returned.

The recovered coal contained 11.97% ash and had the following percentages of particle sizes on:

Particle

larger than 0.50 mm 0.40%

larger than 0.25 mm 37.26%

greater than 0.177 mm 27.44%

greater than 0.149 mm 13.59%

greater than 0.074 mm 13.60%

smaller than 0.074 mm 7.71%

The waste contained 76.06% ash and had the following percentages of the particle size:

Particle

greater than 0.50 mm 0.71%

larger than 0.25 mm 34.10%

greater than 0.177 mm 22.42%

greater than 0.149 mm 12.03%

greater than 0.074 mm 26.04 <Vo

smaller than 0.074 mm 4.70%

The theoretical yield of coal recovered was 66.8% or 18.71. The actual yield was 16.5 t or 88.4% of the theoretically recovered material.

Claims (1)

Claim: Method for sorting a non-magnetic, weight-differentiated solid mixture with a particle size between 6.0 and 0.074 mm in a separation pulp with a magnetically conductive one Heavy material, which is in a separating container partly on the surface of the bath, partly on one below the separation zone is introduced and a decreasing from bottom to top Has weight, characterized in that a separating beet is used with a weight which is smaller than the specific gravity of the particles forming the floating material, at the below the Separation zone lying point separating beet is fed into the bath in such an amount that the heavy particles from the area of the insertion point are deflected downwards and a Caused upward movement of the otherwise calm bath beginning at the point of introduction through which the viscosity gradient of the separation turbid is kept constant and the floating material forming the particles in the state of suspension be held while the sediment flows through together with part of the separating beet one provided at the bottom of the separation vessel Opening through, as known per se, is continuously withdrawn. Documents considered: German Patent No. 915 922. 1 sheet of drawings 609 567/209 4.66 © Bundesdruckerei Berlin