RU2091170C1 - Centrifuge for recovering heavy non-ferrous metal from slurry - Google Patents

Abstract

FIELD: mining and ore dressing industries; production of non-ferrous metals (gold). SUBSTANCE: proposed centrifuge comprises cylindrical body having conical bottom and discharge pipe. Body houses rotor comprising outer cylindrical shell having bottom and overflow edge. Outer shell houses, arranged at some distance from its wall, inner cylindrical shell so that both shells define circular cavity therebetween. Inner shell has plurality of openings for passage of washing water flow and it is divided by circular partitions into sections. Centrifuge further comprises inlet pipe and conduits leading to outer shell bottom for admission of washing water into circular cavity, means for supply of feed slurry, and drive unit. Body is provided with branch inlet pipe for feeding thereinto water and feed slurry, and with means for washing water circulation from centrifuge body to rotor. Said washing water circulation means comprises bowl arranged concentrically with rotor in such manner that its bottom is disposed above rotor so as to form discharging channels intended to discharge excess of slurry from inner shell of rotor, and filtering partition arranged in upper portion of body and attached to walls of body and of bowl. Bowl bottom has centrally disposed branch pipe for passage of washing water into inlet pipe of rotor. EFFECT: proposed centrifuge ensures high percentage of recoveries of metal values, particularly gold, from feed slurries. 1 dwg

Description

 The invention relates to equipment for treating suspensions in the field of centrifugal forces of heavy non-ferrous metals, for example gold, and can be used in mining, processing and other industries where separation of a valuable heavy component from the bulk of the associated rock is required.

A known centrifuge for extracting heavy non-ferrous metal from a suspension, including a cylindrical body with a conical bottom and a drain pipe, a rotor installed in the housing, containing an outer cylindrical shell with a bottom and overflow side, an inner cylindrical shell with openings for rinsing passage to form an annular cavity water, divided by annular partitions into sections, an inlet pipe and channels in the bottom of the outer shell for supplying flushing water to the annular cavity, means for supplying the initial suspension and drive [1]
The disadvantage of a centrifuge is the high flow rate of the wash water.

 The technical result of the invention is to reduce the consumption of the latter by using only the water contained in the suspension entering the centrifuge.

 This is achieved by the fact that in the proposed centrifuge for extracting heavy non-ferrous metal from a suspension, including a cylindrical body with a conical bottom and a drain pipe, a rotor installed in the body, containing an outer, cylindrical shell with a bottom and overflow side, located inside it with the formation of an annular cavity a cylindrical shell with holes for the passage of washing water, divided by annular partitions into sections, an inlet pipe and channels in the bottom of the outer shell for supplying a washing water into the annular cavity, the means for supplying the initial suspension and the drive, the housing is equipped with a pipe for supplying water and the original product into it, and is equipped with a means for circulating the washing water from the housing into the rotor, containing a cup mounted concentrically to the latter so that its bottom is located above the rotor with the formation of outlet channels for excess suspension from the inner shell of the rotor, and a filter partition in the upper part of the housing attached to the walls of the latter and the glass, while its bottom has a central but located pipe for the passage of washing water into the intake manifold of the rotor, and means for supplying raw material slurry is a tapered pipe attached to the bottom of the outer shell and communicating with the cavity of the housing through openings in the bottom of said shell with dividing sections.

 The invention is illustrated in the drawing, which schematically shows a longitudinal section of a centrifuge.

 A centrifuge for removing heavy non-ferrous metal from a suspension includes a cylindrical body 1 with a conical bottom 2 and a drain pipe 3 provided with a shutter 4, a rotor 5 installed in the housing, containing an outer cylindrical shell 6 with a bottom 7 and an overflow side 8 located in it with the formation of an annular cavity 9 inner cylindrical shell 10 with holes 11 for passage of washing water, divided by annular partitions 12 into separation sections 13, inlet pipe 14 and channels 15 in the bottom 7 of the outer shell for a wash water inlet into the annular cavity 9, by supplying the initial suspension, which is a conical pipe 16, attached to the bottom 7 and communicating through the holes 17 with the separation sections, and the shaft rotation drive 18, on which the rotor 5 is mounted in bearings 20 mounted on cover 21 of housing 1.

 The latter is equipped with a pipe 22 for supplying water and a starting product into it and is equipped with a means for circulating the washing water from the housing into the rotor, containing a cup 23 mounted concentrically to the latter so that its bottom 24 is located above the rotor with the formation of outlet channels 25 for excess suspension from the inner shell of the rotor, and a filter partition 26 in the upper part of the housing attached to the walls of the latter and the glass.

 The bottom 24 of the latter has a centrally located nozzle 27 for the passage of flushing water into the inlet nozzle 14 of the rotor. Under the drain pipe 3, a container 28 for unloaded concentrate is installed.

 The centrifuge operates as follows.

 Through the pipe 22 in the housing 1, the initial product is poured, and washing water is poured there below the level of the filtering partition 26 and the drive 18 of the rotation of the rotor 5 is turned on and the latter is unwound in the bearings 20 to the specified speed. The rotor 5, rotating inside the housing 1, spins the initial product loaded with water, and under the action of centrifugal forces, the resulting suspension is sucked in through the conical pipe 16 and the holes 17 into the inner cavity of the rotor, where the heaviest particles of the suspension are deposited in the radial sections 13 between the annular partitions 12 The excess water and the lightest particles rush up and through the overflow board 8 are discharged onto the inner surface of the glass 23 and from there flow back to the bottom 2 of the housing 1. Simultaneously under By the action of centrifugal forces, the pressure of the rotating suspension on the inner walls of the housing increases, its level rises and the filter baffle 26 is reached. Solid particles of the suspension are also discharged to the bottom of the housing, and pure water rises above and flows down the bottom of the cup 24 to the center and through nozzles 27 and 14 under the action of centrifugal forces through the radical channels 15 enters the annular cavity 9 formed by the outer 6 and inner 10 cylindrical shells of the rotor. From this annular cavity through the holes 11, water, due to the pressure differential formed by the difference in the levels of the radial channels 15 and the overflow side 8, breaks through the layer of particles located between the annular partitions 12 and flushes out the lightest particles, flowing over the overflow side 8. At the same time these light particles are replaced by heavier ones from the flow of the suspension coming from below through the conical pipe 16 and the hole 17. Thus, during the operation of the centrifuge, the concentration of heavy particles in the sections between annular partitions 12.

 Since the process is carried out continuously and for a long time, the probability of deposition of heavy particles is very high and practically depends on the circulation speed and time, that is, the process can be carried out until all heavy particles are collected inside the rotor.

 After operation of the centrifuge, open the shutter 4 and water with the remainder of the product from which the heavy phase has already been removed, pour into a container 28. For a more thorough washing of the heavy phase remaining in the rotor, the process can be repeated, but only with clean water. The remaining useful heavy product from the rotor is removed after it is stopped, either by disassembling it or by rinsing with water jets.

 During the test, 10 kg of gold concentrate with a gold content of 10 kg / ton was loaded into a centrifuge and 30 liters of water was poured.

Useful volume of a rotor of 0,1 liters. After 30 minutes of operation at a rotor speed of 1460 rpm, 530 grams of secondary concentrate were obtained with a gold content of 47.16%
Sources of information
1. Ca, patent N 1111809, B 04 B 5/00, 1981.

Claims (1)

 A centrifuge for extracting heavy non-ferrous metal from a suspension, including a cylindrical body with a conical bottom and a drain pipe, a rotor installed in the housing, containing an outer cylindrical shell with a bottom and overflow side, an inner cylindrical shell with openings for passage of washing water to form an annular cavity divided by annular partitions into sections, an inlet pipe and channels in the bottom of the outer shell for supplying washing water to the annular cavity, means for I supply the initial suspension and the drive, characterized in that the housing is equipped with a pipe for supplying water and a source product to it and means for circulating the washing water from the housing into the rotor, containing a cup mounted concentrically to the latter so that its bottom is located above the rotor with the formation of outlet channels for excess suspension from the inner shell of the rotor, and a filter baffle in the upper part of the housing, attached to the walls of the latter and the glass, while its bottom has a centrally located nozzle for ode wash water into the intake manifold of the rotor, and means for supplying raw material slurry is a tapered pipe attached to the bottom of the outer shell and communicating with the body cavity and through holes in the bottom of said shell with dividing sections.