RU2332261C2 - Apparatus for centrifugal concentration of fine ores and noble metal processing products - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: present invention relates to the field of gravity concentration of fine ores different in density, in particular noble metal ores. The apparatus for gravity concentration of fine ores and noble metal processing products includes a conical rotor bowl, a power device, rich fraction, middling product, and tailing discharge devices. The internal surface of the conical rotor bowl has circular rifflings from the bowl bottom to a height of 0.9-0.92 H of the rotor bowl height, an adjustable circular slot widening to the discharge side being located at a height of 0.95 H, (H is the rotor bowl height).

EFFECT: increased recovery of valuable components from ore.

1 dwg, 1 tbl

Description

The present invention relates to the field of gravitational enrichment of finely ground ores, differing in density, in particular ores of precious metals.

Gravity methods occupy one of the leading places in the field of enrichment, especially coal, ores of ferrous metals, tungsten, tin, gold-platinum ores.

For large disseminated ores, jigging machines and separators using heavy suspensions (heavy media) are widely used; for medium disseminated ores (-3 + 0.1 mm) - screw separators, various types of locks, concentration tables (V.N. Shokhin, A.G. Lopatin, “Gravity dressing methods”, M .: Nedra, 1980) .

In the gravitational enrichment of finely disseminated ores (<0.1 mm), various types of discontinuous centrifugal concentrators have recently been used, in which the so-called lock effect is used. These are the concentrators of foreign companies Falcon, Nelson, Russian companies Itomak, OJSC Granit, CJSC Rotor Lines, CJSC New Technologies (see the advertising brochures of the companies Falcon, Nelson; Innovative project MNPO-Polymetal OJSC ”; I.A. Enbaev, B.P. Rudnev and others.“ Processing of tailings and unconventional raw materials using effective enrichment processes ”, M .: 1998).

The main disadvantage of these designs is the low yield of the finished product, which does not allow to extract materials having an intermediate density, and also to use these devices in ores having a relatively high content of valuable components.

This problem is solved in the so-called concentrators with continuous unloading of concentrate, for example concentrators of the aforementioned companies Falcon, Nelson, a Russian concentrator created according to the patent of the Russian Federation No. 2026745 of 08/18/1992, which was taken as a prototype. In these devices, due to the continuous unloading of the concentrate (enriched product), the yield of the latter can vary from ~ 4 to 40%, however, the content of valuable components, in particular noble metals, is significantly inferior to the quality of products obtained from discontinuous concentrators. Given that rich and poor products, in particular those containing precious metals, are subsequently subjected to various finishing operations, the inability to obtain several products of different quality at the same time leads to loss of extraction or requires the use of a number of devices (for example, centrifugal concentrators of continuous actions followed by refinement of the industrial product on a centrifugal discontinuous concentrator or installation of a number of discontinuous concentrators, through which the pulp of finely divided ore passes successively).

The aim of the invention is to increase the extraction of valuable components, in particular noble metals, in centrifugal enrichment.

This goal is achieved in that the apparatus for centrifugal enrichment of finely ground ores and products of precious metals processing, including a conical rotor-bowl rotating around a vertical axis, devices for supplying power, unloading a rich fraction, a device for unloading industrial products and tails, differs in that on the inside the surface of the conical rotor-bowl from its bottom to 0.9-0.92N the height of the rotor-bowl are ring rafting, and at a height of 0.95H is an adjustable annular slot, expanding in the direction of unloading (N - height of the rotor-bowl).

The proposed apparatus for centrifugal beneficiation of finely ground ores of precious metals is shown schematically in the drawing. It consists of a conical rotor-bowl (1), driven into rotation by an electric motor (2) through a hollow shaft (3). Up to a height of 0.9-0.92 N from the bottom of the rotor-bowl, ring flats (4) are installed on its inner surface, and above, at a height of 0.95 N from the bottom, there is an annular through slot (5) expanding towards the discharge of the product into the ring receiver (7); the slot width is adjusted with screws (6). Tails are unloaded through the upper part of the rotor-bowl into the annular tail receiver (8); false bottom (9) for unloading rich concentrate through the hollow shaft (3); a pipe (10) for supplying power; devices for switching power (11); devices for changing the speed of the electric motor with sprayers 12); pipe with sprayers for supplying loosening water (13).

The placement distances of the annular arches and the annular slot from the bottom of the rotor-bowl are selected experimentally.

The device operates as follows. The feed in the form of a pulp through a device for switching power (11) and a feed pipe (10) is supplied to a conical rotor-bowl (1), driven into rotation by an electric motor (2) through a hollow shaft (3). Due to centrifugal forces, particles with a higher density are trapped by ring non-frillations (4), and a part of particles with a lower density (splices) are pressed to the inner surface of the bowl, however, they are not trapped in the ring rafts, but continue to rise up the bowl. Closest to the center of the rotor-bowl are the lightest particles (for example, rock minerals). Reaching an annular through slot (5) at a height of 0.95 N from the bottom of the bowl, particles with an intermediate density are thrown into the annular receiver for the intermediate product (7). The output of this product can be adjusted with screws (6), reducing or increasing the width of the slot. Tails (the fraction with the lowest density) are discharged into the annular tail receiver (8). The heaviest fraction, caught by annular arteries (4) under the action of loosening water supplied through a pipe with sprayers (13), the pulp transport stream, is subjected to secondary enrichment. After a period determined empirically, the power is switched to another hub by the device for switching power (11). A device for changing the number of revolutions of the electric motor (12) reduces the number of revolutions of the electric motor (2), the loosening water supplied through the pipe with sprayers 13) flushes the concentrate from the ring rafts (4), which passes under the false bottom (9) into the hollow shaft (3 ) and displayed in the finished product. The process is then repeated.

The table shows comparative indicators of the enrichment of gold ore, crushed to a particle size of 80% cells. - 0.074 mm on the apparatus, taken as a prototype, and on the proposed apparatus.

Comparative indicators of gold ore beneficiation №№ Centrifugal concentrator Products Exit, % Au content, g / t Au recovery,% one Prototype Concentrate 30.5 1,5 76,2 Tails 69.5 0.2 23.8 Food 100.0 0.6 100.0 2 Suggested apparatus Concentrate 0.1 97.7 16.3 Industrial product 28,2 1.45 65.8 Tails 71.7 0.15 17.9 Food 100.0 0.6 100.0

The proposed design of the apparatus allows to increase gold recovery by 5.9%, at the same time highlight rich concentrate and industrial product.

Claims (1)

Apparatus for centrifugal enrichment of finely ground ores and products of precious metals processing, including a conical rotor-bowl rotating around a vertical axis, devices for feeding, unloading a rich fraction, industrial product and tails, characterized in that on the inner surface of the conical rotor-bowl from its bottom to 0.9–0.92 N of the height of the rotor-cup are ring annularities, and at a height of 0.95 N there is an adjustable annular slot expanding towards the discharge side (H is the height of the rotor-cup).