RU2776546C1 - Complex for enrichment of non-ferrous metals of vertical loading - Google Patents

Abstract

FIELD: materials separation.

SUBSTANCE: proposed invention relates to the field of separation of materials and can be used in mining, metallurgical and other industries in the processing of both placer and technogenic mineral deposits. The complex for the enrichment of non-ferrous metals of vertical loading includes technologically connected and sequentially interacting upper and lower belt conveyors, and a centrifugal-vibration concentrator located under the lower conveyor. Each of the belt conveyors consists of two non-magnetic rotating drums - a driving and a driven. Inside the driven drums there are magnetic systems in the form of rotors with permanent magnets of alternating polarity. The rotors and the conveyor belt are made with the possibility of their rotation at different speeds from individual motors with frequency-controlled drives. Belt conveyors and centrifugal-vibration concentrator are interconnected by dosing bins. The loading batcher is made with the function of regulating the flow thickness.

EFFECT: increasing the efficiency of extraction of non-ferrous metals, including precious metals in one enrichment cycle.

1 cl, 1 deg, 3 tbl, 1 ex

Description

The invention relates to the field of separation of materials and can be used in mining, metallurgical and other industries in the processing of both placer and technogenic mineral deposits.

An electrostatic separator is known (RU No. 2018374, publ. 08/30/1994) for separating bulk materials and separating fine-grained powders into conductors and dielectrics, consisting of a sealed housing, an electric field source, a device for supplying the source material and discharging separation products.

A significant disadvantage of this separator is its low productivity and the limited upper limit of the size of non-conductive particles (no more than 3 mm).

Known electrodynamic separator (SU No. 1715426, publ. 28.02.1992) for the extraction of non-ferrous metals from the waste of industrial enterprises and the extraction of valuable components from the crushed scrap of household radio equipment. The separator contains a loading and unloading hopper, a conveyor made of a dielectric material, made in the form of a disk with unloading windows for removing non-conductive particles with a scraper, a traveling magnetic field inductor located under the conveyor coaxially with it and made in the form of a disk with a drum in which in the grooves permanent magnets with alternating polarity are placed on the inductor disk at an angle to the diametrical axis so that their length covers the area of the conveyor not occupied by the reloading windows.

The disadvantages of this device include the complex design of the device for removing the non-conductive fraction.

The objective of the proposed technical solution is to increase the efficiency of separation of the source material in one enrichment cycle.

The problem is solved with the help of the proposed complex for the enrichment of non-ferrous metals of vertical loading, including technologically connected and sequentially interacting upper and lower belt conveyors and a centrifugal-vibration concentrator located under the lower conveyor, each of the belt conveyors has two non-magnetic rotating driving and driven drums , inside the driven drums there are magnetic systems in the form of rotors with permanent magnets of alternating polarity, the rotors and the conveyor belt are made with the possibility of rotating them at different speeds from individual motors with frequency-controlled drives, in addition, the belt conveyors and the centrifugal-vibration concentrator are interconnected hoppers-batchers, and the loading batcher is made with the function of regulating the flow thickness.

The technical result is to increase the efficiency of extraction of non-ferrous metals, including precious metals in one enrichment cycle.

The invention is illustrated in the drawing.

In FIG. 1 shows the structural diagram of the complex.

The inventive complex consists of a loading batcher 1, an upper belt conveyor 2 with a magnetic system 3, a hopper 4 of the magnetic fraction, an intermediate hopper 5, a lower belt conveyor 6 with a magnetic system 7, a hopper 8 of the electrically conductive fraction, a centrifugal vibration concentrator 9, receiving hopper 10 for the fraction of non-ferrous metal concentrates, including precious metals, and receiving hopper for inert particles 11.

Top 2 and bottom 6 belt conveyors, each consists of two non-magnetic rotating drums - leading and driven, made, for example, of fiberglass, having independent drives, connected by a conveyor belt. The conveyor belt is made of, for example, polyvinyl chloride (PVC). Inside the rotating driven drums, magnetic systems 3 and 7 are placed. Magnetic systems 3 and 7 are made in the form of rotors with permanent magnets of alternating polarity. The rotors and the conveyor belt are made with the possibility of their rotation at different speeds from individual motors with frequency-controlled drives. The loading dispenser 1 is designed with the function of regulating the flow thickness, which is provided, for example, by a rigid plate fixed in the upper part of the dispenser and the free lower end on which the adjusting bolt is fixed, which allows using the most optimal flow thickness, ensuring the maximum extraction of magnetic and non-ferrous metals at high productivity .

The complex works as follows.

The source material (Figure 1) from the loading dispenser 1 with the function of flow thickness control is fed vertically downwards in front of the moving conveyor belt of the upper belt conveyor 2, consisting of two drums with independent drives and without touching the conveyor belt under the influence of the magnetic field of the permanent magnets of the magnetic system 3 located in the driven drum, particles with magnetic properties are attached to the conveyor belt and, moving counterclockwise, are loaded into the hopper 4 of the magnetic fraction. The rest of the non-magnetic material coming from the loading batcher 1 enters the intermediate batcher 5, which is also a feeder for the lower belt conveyor 6, also consisting of two drums, master and slave, having independent drives, connected by a conveyor belt and, falling vertically down without touching conveyor belt of the conveyor 6 falls into the area of action of the magnetic system 7. Under the influence of an electric alternating field created during counterclockwise rotation, for example, at a speed of 3000 rpm of the magnetic system 7, located in the driven drum, particles with electrically conductive properties are attached to the conveyor belt the lower conveyor 6, which rotates clockwise, delivers them to the hopper-dispenser 8 of the electrically conductive fraction, which is also the receiving hopper of the centrifugal-vibration concentrator (CVC) 9. And the inert material free from magnetic and electrically conductive particles guides 11 inert particles are fed into the receiving hopper. The required amount of water enters the CVC through the inlet. Further, under the influence of gravitational forces, electrically conductive non-ferrous, including noble metals, fill the bowl of the CVC 9 and are periodically removed through the withdrawal of the fraction of non-ferrous metal concentrates, including precious metals, into the receiving hopper 10 of the fraction of non-ferrous metal concentrates, including precious metals, and the material free from extracted non-ferrous and precious metals is sent to the receiving hopper 11 inert particles.

The enrichment process of the proposed complex occurs in one cycle. The complex can work with crushed ore, man-made materials, and concentrates. Particular attention should be paid to the possibility of enrichment at the proposed complex of a particularly fine fraction in the form of dust.

The results of the experiments showed that due to the use of combined magnetic systems, it is possible to enrich large-sized unclassified material up to 10 cm, which significantly expands the scope of magnetic separation as an independent operation in mines, quarries, factories, without loss of a valuable component.

Example.

The extraction of the magnetic and electrically conductive fraction was carried out on a sample from the tailing dump of a mining and processing enterprise in the city of Miass. The chemical composition of the R3-I sample is shown in Table No. 1.

Table 1

where

EI - element, PPM - mass fraction of the element in grams per 1 ton, percent, +/-3 σ - limit of the permissible relative systematic error component of the mass fraction of the element, percent.

The content of gold and silver turned out to be below the sensitivity threshold of the Vanta X-ray fluorescence scanner, which was used to determine the chemical composition of the samples.

In dry form, the sample entered the loading batcher 1, from it into the zone of the magnetic system 3, operating in the magnetic separation mode. In this case, an insignificant magnetic fraction entered the upper belt conveyor 2, and then into the hopper 4 of the magnetic fraction.

The sample, purified from magnetic impurities, entered the intermediate dosing hopper 5, from it into the zone of the magnetic system No. 7, operating in the electrodynamic separation mode. The electrically conductive fraction entered the lower belt conveyor 6, and then into the hopper 8 of the electrically conductive fraction. The chemical composition of the electrically conductive fraction (sample P3-E) is shown in Table No. 2.

table 2

where

EI - element, PPM - mass fraction of the element in grams per 1 ton, percent, +/-3 σ - limit of the permissible relative systematic error component of the mass fraction of the element, percent.

The output of the electrically conductive fraction was 0.5%. Gold grade was 10+/-2 grams per ton, silver grade was 21+/-6 grams per ton.

The sample, purified from magnetic and electrically conductive impurities, entered the receiving hopper of inert particles 11. The chemical composition of the P3-X sample is shown in Table 3.

where

EI - element, PPM - mass fraction of the element in grams per 1 ton, percent, +/-3 σ - limit of the permissible relative systematic error component of the mass fraction of the element, percent.

The gold and silver content is also below the detection threshold of the Vanta X-ray fluorescence scanner.

As a result of sample purification from impurities, the possibilities of using these mining wastes in the national economy, in particular, in the construction industry, where there are requirements for the content of iron and other metals, have increased.

The hopper-dispenser 8, where the electrically conductive fraction was directed, is at the same time the receiving hopper of the centrifugal-vibration concentrator (CVC) 9, the operation of which requires an additional supply of water. As a result of using the CVC, light fractions are sent to the receiving hopper of inert particles 11, and the enriched electrically conductive fraction is sent to the receiving hopper 10. As a result of using the vertical loading complex for enriching non-ferrous metals, the gold content is increased to 2 kg per ton. This product can be sent to the refinery without additional processing.

Thus, the problem has been solved, with the help of the proposed complex, the efficiency of separation of the source material in one enrichment cycle is increased.

The proposed complex for the enrichment of non-ferrous metals of vertical loading, which is a simple device, without complex installation, will increase the efficiency of the separation process due to the most complete extraction of particles of non-ferrous metals, including precious metals in one cycle and can be used in mining, metallurgical and other industries industries in the processing of both placer and technogenic mineral deposits.

Claims (1)

A complex for the enrichment of non-ferrous metals of vertical loading, including technologically connected and sequentially interacting upper and lower belt conveyors and a centrifugal-vibrating concentrator located under the lower conveyor, each of the belt conveyors has two non-magnetic rotating driving and driven drums, inside the driven drums there are magnetic systems in the form of rotors with permanent magnets of alternating polarity, the rotors and the conveyor belt are made with the possibility of rotating them at different speeds from individual engines with frequency-controlled drives, in addition, the belt conveyors and the centrifugal-vibration concentrator are interconnected by hoppers, the dispenser is made with the function of regulating the flow thickness.

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