RU2135294C1 - Plant for recovery of noble metals from loose rocks - Google Patents

Abstract

FIELD: mineral concentration, particularly, devices for recovery of noble metals, their solid solutions and intermetallic compounds from loose rocks. SUBSTANCE: plant includes loading device, device for disintegration and screening, separators and pumping unit, scrubbers with supplying and retarding members arranged at different angles and unloading device, two-sieve cylinder screen whose external and internal perforations carrying retarding members and rings with regulated discharge holes, centrifugal separators, vibration concentrator for trapping native metals, device for dewatering and transportation of tailings of vibration concentrators and swing chute. Scrubber and two-sieve cylinder screen are rotated by one drive. EFFECT: higher efficiency. 2 dwg

Description

 The invention relates to the enrichment of minerals, in particular to devices for the extraction of precious metals, their solid solutions and intermetallic compounds from loose rocks.

 Known industrial device PKBSH-100 (Potemkin S.V. Development of placer deposits. M., "Nedra", 1995, pp. 337 - 347), including a loading device, a drum screen, sluice deep and shallow filling, dump and pumping station.

The disadvantages of the PKBSh-100 industrial device are the low extraction of precious metals of small and thin classes, the insufficient disintegration of hard-washed sand, the total consumption of water and electricity for processing 1 m ^{3 of} rock mass.

 The closest in technical essence is the UOD-2.2 mining and processing plant (Khabirov V.V., Zabelsky V.K., Vorobyov A.E. Progressive technologies for the extraction and processing of gold-containing raw materials. M., "Nedra", 1994, p. . 63 - 64), consisting of a loading device, a device for disintegration and screening, two centrifugal vibrating separators and a pumping station.

The UOD-2.2 installation has the following disadvantages:
1. A low degree of disintegration and a decrease in screening efficiency, since it is impossible to carry out effectively two different processes of disintegration and screening with the same rotation speed in one drum-type apparatus provided in this design. Incomplete disintegration and a decrease in screening efficiency leads to an increase in metal loss in individual products.

 2. The supply of all process water to the screen scrubber is insufficient for the efficient implementation of disintegration and screening processes, which reduces metal recovery.

 3. The design of the installation does not provide for the installation of any apparatus for extracting nuggets larger than 25 mm, which are dumped into the dump.

 4. Centrifugal-vibration separators operate on coarse-graded material (-25 mm), which leads to an increased yield of concentrate due to material of large classes and to the loss of small metal.

 5. The drive of the centrifugal-vibration separator has a complex structure, increased electric motor power and insufficient life of the apparatus.

 6. The absence of a spreader reduces the efficiency of the installation.

 The proposed installation for the extraction of precious metals from loose rocks includes a loading device, a device for disintegration and screening, separators and a pump station, a scrubber with feeding and delaying packs located at different angles, and an unloading device, a two-screen drum screen, on the external and internal perforations which contains retaining pads and rings with adjustable outlet openings, centrifugal separators, self-trapping vibration concentrates ry, a device for dehydration and transportation of tailings of self-trapping vibration concentrators with a dumping agent. Moreover, the rotation of the scrubber and double-screen drum screen is carried out from one drive.

 A scrubber with feeding and retaining pads located at different angles and an unloading device allows you to control the quality of disintegration, which helps to release precious metal grains from clay deposits and reduce metal loss.

 The double-screen drum screen, on the external and internal perforations of which there are retaining pads and rings with adjustable outlet openings, increases the residence time of the material in the screen, intensifies the mixing and rubbing of material from clay muds, increasing the screening efficiency and reducing material loss.

 Providing different rotational speeds of the scrubber and double screen drum screen from a single drive simplifies the design and reduces costs.

 Centrifugal separators have a simple design of the drive, low energy consumption, a long service life and a lower yield of concentrate. This helps to increase the extraction of precious metals, especially small and thin classes, and lower operating costs.

 Self-trapping vibration concentrators are made of three chambers, allow three material cleanings in one apparatus and provide extraction of nuggets.

 The introduction of a device for dewatering and transporting tailings of self-trapping vibration concentrators and a spreader increases the efficiency of the installation and reduces the cost of processing the rock mass.

 A plant for extracting precious metals from loose rocks is shown in FIG. 12.

 The apparatus for extracting precious metals from loose rocks includes a loading device 1, a frame 2, on which all working bodies are located: a scrubber 3 with a receiving hopper, a two-screen drum screen 4, a scrubber and screen 5 drive, an under-product distributor 6, two main centrifugal separators 7, installed in parallel, two control centrifugal separators 8, a distributor of the inter-drum product 9, self-trapping vibration concentrators 10, a device for dewatering and transporting hvos s samorodkoulavlivayuschih vibratory hub 11, spreader 12, a pumping station 13 with the water distribution system.

 Installation works as follows.

 Loose rocks with a bulldozer or other loading device are fed into the loading device of the installation. The material, together with non-pressure water, is fed through a receiving hopper to a scrubber, where it is subjected to intensive mixing, abrasion, and impact of rock particles, under the influence of which the material is disintegrated in the water bath. The disintegrated material in the form of a pulp with rock particles by a loading device is fed to the internal screen of a double-screen drum screen, and low-pressure water is additionally supplied there. In the drum, the material undergoes intensive mixing and is dispersed into three fractions: a large fraction from the inner drum through a pebble tray is sent to the spreader and dumped into the dump.

 The inter-drum product is subjected to intensive washing by particles of the material accumulated in the inter-drum space, and washed, and sent to the distributor of the inter-drum product, and is distributed over the self-trapping vibration concentrators, the amount of which depends on the output of the inter-drum product.

 In vibration concentrators under the influence of vibrational forces in a moving stream of material there is a segregation of particles by density; higher density nuggets are held up by the thresholds of the chambers, light particles are sent to a dewatering device, then to the tail conveyor of self-trapping vibration concentrators and the main dumping unit.

 Concentrators of self-trapping vibration concentrators are removed and sent to the allocation of nuggets.

 The under-sieve product of the drum screen is sent to the distributor of the under-sieve product, in which it is divided into two parts, each of which is sent to the main centrifugal separator; particles of noble metals, including small and fine ones, accumulate in each person's tunings under the action of centrifugal forces.

 As the concentrate accumulates in the arrays by at least 2/3 of the volume of the riffles, the separators are turned off, the centrifugal forces that press the particles to the riffles decrease, and the concentrators from them are sent through the outlet openings for finishing.

 The tailings of the main separators are sent to control separators of a similar design to recover fine and thin metal. The release of concentrators from them is carried out as the crowdings are filled by at least 2/3 of their volume. The tails of the control separators are sent to the settling pond.

 The pump station through a pipeline system delivers recycled water from the sump pond to all process units of the installation.

Claims (1)

 Installation for extracting precious metals from loose rocks, including a loading device, a device for disintegration and screening, separators and a pumping station, characterized in that the installation contains a scrubber with feeding and delaying pads located at different angles, and an unloading device, a two-screen drum screen , on the external and internal perforation of which there are retaining sets and rings, with adjustable outlet openings, centrifugal separators, Suitable vibratory hubs, and dewatering device for transporting tailings samorodkoulavlivayuschih vibration hubs and spreader, and a scrubber rotation and dvuhsitnogo trommel performed by a single driver.

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