RU2160165C1 - Production flow line with gravity concentrator for processing of metalliferous sands - Google Patents

Abstract

FIELD: equipment for concentration of rebellious gold-containing ores and placers with associated separation of metal mercury. SUBSTANCE: production flow line includes disintegrating classifier, device for primary concentration, gravity concentrator, accumulators, pumping system, concentrator, device for mercury sublimation in closed cycle, device for gold melting with absorber, Accumulator of primary concentration stage has amalgamation magazines with device for their resetting. Pumping system is installed for supply of heavy minerals of primary concentration stage after their amalgamation to pulp flow distributor of gravity concentrator. The latter is made with multiradius flow forming surface in several rows with riffles and staggered displacement of flow at outlet. Concentrator has magnets installed before section of flow displacement at outlet, accumulator of mineral inclusions sorbing mercury, and accumulator of magnetic fraction which have amalgamation magazines with their automatic control device. EFFECT: higher efficiency of recovery of useful component and mercury-containing impurities, provided safety for environment. 8 cl

Description

 The invention relates to the field of gravitational concentration of refractory gold-bearing ores and placers with associated emission of metallic mercury.

 Known technological scheme, consisting of agitation, concentration tables and a device for the sublimation of mercury [1].

 This technology is based on the use of toxic reagents, inefficient and does not provide complete environmental safety.

 A known technological scheme for the utilization of gold-containing amalgam, consisting of a screen, a mechanical tray, a magnetic separator, a unit for concentrate separation in an upward flow of water using selective sorbents in a closed cycle, a sublimation unit for mercury sublimation in a closed cycle, and gold melting with a charge [2].

 The advantage of this scheme is the possibility of using it for the processing of technogenic raw materials, as well as its suitability for the isolation of gold-containing amalgam at the beginning of the technological process. However, to improve the efficiency of extracting gold-containing amalgam, further improvement of the equipment is required.

 The closest in technical essence and in the result achieved when using it, is a production line for processing metal-bearing raw materials of gold-bearing deposits with associated emission of gold-containing amalgam and metallic mercury. The production line includes a device for disintegration and classification by size (hydromachder), a device for producing a concentrate of heavy minerals (hydraulic sluice), a device for classifying and enriching small material in a thin stream of water with a continuous output of concentrate, a device for separating gold-containing amalgam (metallic mercury) , receiving hopper, concentrate submersible pump, magnetic separator, conveying device with shadows, triboadhesive separator, device for sublimation of mercury in closed circuit a complete cycle and a gold melting device with a charge equipped with an absorber [3].

 This technology does not carry out a full cycle of mercury removal at all stages of enrichment, does not activate the release of mercury in the process of gravity.

 Mineral inclusions of waste rock that has sorbed mercury and low-density minerals are not cleaned in the first stage of enrichment and the second stage of enrichment.

 The purpose of the invention or the technical result achieved is to increase the efficiency of extraction of gold-containing amalgam and gold and ensure environmental safety due to gravitational concentration and removal of mercury from waste.

 This goal is achieved by the fact that in the production line for processing metal-bearing sands, including a disintegrating classifier, a primary enrichment device, a gravity concentrator, accumulators, a pump system, a concentrator, a device for sublimating mercury in a closed cycle, a device for melting gold with an adsorber, according to the invention, the accumulator the primary stage of enrichment is equipped with amalgamation cassettes with a device for reinstalling cassettes, the pump system is installed with the possibility of supplying heavy mi neralov of the primary enrichment stage after their amalgamation into the flow distributor of the pulp of a gravity concentrator, made with a multi-radial flow-forming surface with riffles in several rows, with staggered flows at the outlet, equipped with magnets installed to the flow displacement section at the outlet, a mineral inclusions storage sorbed mercury, and a magnetic fraction drive having amalgamation cassettes with an automatic cassette control device.

 The implementation of a gravitational concentrator with a multi-radial stream-forming working surface in several rows and a displacement of flows at the outlet allows you to activate the process of concentration of finely dispersed mercury. The supply of the production line with magnets makes it possible to isolate the magnetic fractions of heavy minerals and to extract mercury unsorbed by mineral particles from them. The use of amalgamation cartridges with devices for their installation and removal from the position of amalgamation allows you to remove mercury from the mineral impurities that have sorbed it, to remove mercury in a suspended, free state. Mercury pollution of soils, surface and ground waters is reduced, MPC standards are ensured.

 The production line for processing metal-bearing sand with a gravity concentrator is shown in the drawings.

 In FIG. 1 - process flow diagram; in FIG. 2 - general view of the production line; in FIG. 3 - gravity concentrator; in FIG. 4 is a view A in FIG. 3 - automatic device for controlling amalgamation cassettes; in FIG. 5 is a section BB in FIG. 4; in FIG. 6 is a view B in FIG. 3 - stream distributor; in FIG. 7 - General view of the drive at the primary stage of enrichment; in FIG. 8 is a section GG in FIG. 7.

 The production line for processing metal-bearing sands with a gravity concentrator includes a disintegrating classifier 1, a primary enrichment device 2 in the form of multi-row straight inclined locks 3, a gravity concentrator 4, a primary enrichment stage accumulator 5, a heavy fraction accumulator 6, a mineral inclusions accumulator 7 that absorbed mercury, a magnetic accumulator fractions 8, pumping systems 9, concentrator 10, device for sublimating mercury in a closed cycle 11, device for melting gold with an absorber 12. Gravity the ion concentrator 4 is made with a multi-radius flow-forming working surface 13 in several rows 14. In the upper part of the gravity concentrator 4, a distributor 15 of pulp flows is installed. The multi-radius stream-forming working surface 13 has a displacement of the flows 16 rows 14 at the exit 17 relative to the axis 18 in a checkerboard pattern. Prior to the displacement section of the streams 16, magnets 19 are installed at the output 17. An automatic device 20 is installed above the mineral inclusions storage device 7 and the magnetic fraction storage device 8 to control amalgamation cassettes 21 filled with zinc chips or other metals. Amalgamation cassettes 21 can have a porous sorbent surface holding solid solutions of mercury, or can be made in the form of silver plated copper plates. The primary enrichment stage accumulator 5 is equipped with amalgamation cassettes 22 with a cassette reinstallation device 23 at the top of the drive 24. The cassette reinstallation device 23 has a movable rod 25. The control portion 26 of the mercury content (using membrane filters of 0.4-0.5 microns and atomic absorption method). Sludge trap 27 for the purification of water from mineral suspended particles.

 The production line for processing metal-bearing sand with a gravity concentrator operates as follows.

 The pulp prepared by means of the disintegrating classifier 1 (by grinding, releasing from clay inclusions, classification by size) is fed to the primary enrichment device 2. At the locks 3, the process of separation of high-density and low-density minerals with viscous matter in viscous medium (water) takes place. Waste rock with low-density minerals enters the primary enrichment storage tank 5 with amalgamation cassettes 22 located at the top of the accumulator 24. Mercury adsorbed by gangue and low-density minerals, as well as fine mercury, falling onto the metal surface of the chips or plates in the amalgamation cassettes 22 forms metallic complex compounds held on the surface of the chips or plates. To activate the process of penetration of mercury into cassettes, the movable rod 25 of the cassette reinstallation device 23 can oscillate up and down.

 The heavy fractions of the minerals after rinsing from the primary enrichment device 2 through the pump system 9 are fed to the distributor 15 of the pulp flows of the gravity concentrator 4. Separating into several streams in different directions, the enriched material enters the rows 14 of the multi-radius stream-forming surface 13. At the exit 17, due to the displacement of the flows 16 relative to axis 18 of each row 14 in a checkerboard pattern, as well as the radius of the flow-forming surface, the particles of traction are transverse to the main direction of flow elyh fractions stirring mercury particles merge and their coarsening. Part of the mercury is retained in the flutes along with gold and other heavy minerals. The other part of the mercury enters with mineral inclusions, which adsorbed it, into the accumulator of mineral inclusions 7, where with the help of amalgamation cassettes 21 is held in the form of complex compounds with metals. After the primary and secondary enrichment stages, sludge tank 27 and the dump enter the waste rock and low-density minerals containing mercury within acceptable concentrations close to the background.

 In the process of deposition of heavy fractions by the gravitational concentrator 4, magnets 19 are periodically turned on, allowing to delay and accumulate the magnetic fraction, separating it from the fraction containing gold. In the process of rinsing fractions of heavy minerals with gold, magnets 19 remain on continuously. The heavy mineral fraction enters the accumulator of the heavy fraction 6, then to the concentrator 10, where the final separation of the heavier fraction from the lighter occurs. After the concentrator 10, the heavy fraction enters the device for sublimation of mercury in a closed cycle 11 and then into the device for melting gold with an absorber 12. The magnetic fraction is flushed from the gravity concentrator 4 to the magnetic fraction accumulator 8, where, using separate amalgamation cassettes 21 and automatic device 20 to control the process of separation of mercury and its retention in the form of complex compounds.

At all stages of enrichment, mercury content in the waste is monitored. At control site 26, the process of filtering out mercury compounds using membrane filters of 0.4-0.5 μm is carried out and the content of mercury elements is analyzed using atomic absorption spectrophotometers such as RAF, S-302 (with a sensitivity of 0.5 • 10 ^-5 mg / kg).

 The production line increases the efficiency of extraction of the useful component, mercury-containing impurities and mineral inclusions. It eliminates the ingress of mercury into dumps and sludge traps, ensuring the environmental safety of the environment.

Sources of information
1. Enrichment of mercury-containing wastes of gold mining enterprises. / Khanturgaev G.I. et al. / Phys.-tech. prob. the developer. Minerals, 1994, N 5, p. 113-115.

 2. V.P. Myazin, S.B.Tataurov. About some directions to the development of technological schemes for the utilization of gold-containing amalgam from man-made deposits. - In the book: Gold mining. Problems and prospects. Khabarovsk, t. 2, IGD FEB RAS, 1997, p. 320.

 3. The same / 2 /, pp. 320-321 (prototype).

Claims (1)

 Metal sand sands production line, including a disintegrating classifier, a primary enrichment device, a gravity concentrator, accumulators, a pump system, a concentrator, a closed loop mercury sublimation device, a gold melting device with an absorber, characterized in that the primary enrichment stage accumulator is equipped with amalgamation cartridges with a cassette reinstallation device, the pumping system is installed with the possibility of supplying heavy minerals of the primary stage of enrichment after their amalgam into the distributor of pulp flows of a gravity concentrator made with a multi-radial flow-forming surface with riffles in several rows, with staggered displacement of flows at the outlet, equipped with magnets installed up to the displacement of streams at the outlet, storage of mineral inclusions that absorbed mercury, and storage of magnetic fraction having amalgamation cassettes with an automatic cassette control device.

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