RU1794490C - Way of coal dressing - Google Patents

Description

sludge water, deep and shallow sludge treatment and return to the process of purified water, deep-water recycling water is sent to the rock chamber, and shallow-water recycling water is sent to the industrial product chamber of the jigging machine.

The claimed invention in comparison with the prototype expresses a new sequence of technological operations with 10 implementation of jigging coal, namely:

- a deep-purification water stream is first used in the rock chamber as sublattice water, and then mixed in the by-product chamber with a shallow water stream 15; .

- the shallow water stream is used in the industrial product chamber as under-water and at the same time mixes with the already used deep water stream.

The claimed new features of the invention made it possible to reveal new technical properties of the coal enrichment method in comparison with the prototype: 25.

- combining technological processes of mixing the differing properties of the flows of the under-sieve water and the separation of coal by density;

- use for technological operation 30 mixing water flows of a by-product chamber of a jigging machine instead of a tank;

- increasing density along the length of the machine, effective viscosity of under-water and a solid content (g / l) in it from 0 to a predetermined maximum;

- increased solids content in the undergrate water of the by-product chamber before mixing; 40

- circulation of useful solid (specific sludge) with recycled water only in the chamber that releases useful products: concentrate and industrial product;

- reducing the time spent by 45 sludge in the jigging machine. ..

Therefore, the beneficial effect is determined by:

- reduction of coal losses in the rock during removal of sludge from circulation through the no-IJQ native chamber with under-sieve water; . - increasing the yield of concentrate during the flotation of sludge removed from the circulation through the rock chamber;

- reducing sludge formation, since 55 the residence time of the sludge in the jigging machine is reduced and the rock separated in the rock chamber is excluded from the process of abrasion of the sludge;

- exceptions to the flow mixing tank subsurface supply grid;

- increasing the depositing capacity by the amount of sludge removed from the circulation through the rock chamber;

- a reduction in specific flotation volumes, filtration areas, and condensation due to an increase in the hard water in shallow water purification when enriching fine coal to 150 g / l, and large coal to 200 g / l without deteriorating the quality of the concentrate, i.e. achieved previous quality indicators of the concentrate in a more affordable (cheap) way.

The claimed method is illustrated by the scheme, where 1 is the rock chamber of the jigging machine, 2 is the industrial product chamber of the jigging machine, 3 is a radial thickener of shallow sludge treatment; 4 - hydrocyclone classifier; 5 - flotation machine; 6 - radial thickener with a suspended layer of deep cleaning.

The inventive method is carried out as follows: the sludge obtained from the deposition of coal is sent to a shallow treatment of sludge waters. for example, to a radial thickener 3, where a drain and a thickened product are obtained, the sludge of which is separated in a hydrocyclone classifier 4 and is sent to deep cleaning, an integral part of which is a flotation machine 5 and a radial thickener with a suspended layer 6. Drain of a radial thickener 3 with a small cleaning It is divided into streams, one of which (recycled water) is directed under the sieve of the by-product chamber, and the other into deep cleaning. In the radial thickener 6, a clean drain is obtained and the necessary part (recycled water) is sent under the sieve of the rock chamber 1, and the excess drain is combined with a part of the shallow cleaning stream used as transport water during deposition.

The amount of condensed product (m3 / h) sent to flotation is determined by the well-known condition for the radial thickener 3. to be drained, in which a solid content is acceptable for depositing this feed, i.e. a concentrate of a given quality is obtained, and the total volume of flotated pulp is determined by the need to obtain the desired volume of radial thickener discharge to be deeply cleaned and to remove from the shallow.

5 .. . 1794490 6

the method, taking into account the specific conditions of the sludge entering the circuit with the feed of the formation and the amount of primary sedimentation.

. Formula A from Breteni

A method of coal enrichment, including the deposition of coal in a jigging machine with rock and industrial compartments to obtain concentrate, industrial product, waste and sludge water, deep and shallow treatment of sludge water and return to

the process of purified water, with only one and the fact that. in order to reduce the cost of coal processing and coal losses, the deep-water recycled water is sent to the rock chamber, and the shallow-water recycled water is sent to the industrial product chamber of the jigging machine.