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Raw coal washing process capable of realizing non-polar ash conditioning

A technology for stepless conditioning and raw coal, which is applied in solid separation, wet separation, chemical instruments and methods, etc., can solve problems such as reducing the pressure of coal slime water system, and achieve the effect of reducing coal washing cost, easy realization, and extending the lower limit.

Inactive Publication Date: 2010-06-02
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the increasingly fierce competition in the coal market, users are increasingly demanding on product quality, and the increase in the amount of pulverized coal has brought enormous pressure to the slime water treatment system of the coal preparation plant. In this case, what kind of The coal preparation process can not only increase the yield of clean coal as much as possible on the premise of ensuring the quality of clean coal, but also reduce the pressure of the slime water system; while producing qualified commercial coal, it can also strictly control production The cost has become a major problem facing the coal preparation industry

Method used

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  • Raw coal washing process capable of realizing non-polar ash conditioning
  • Raw coal washing process capable of realizing non-polar ash conditioning
  • Raw coal washing process capable of realizing non-polar ash conditioning

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Experimental program
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Embodiment 1

[0038] Such as figure 1 Shown, the technological process of the present embodiment is as follows:

[0039] a. After the raw coal enters the coal preparation system, the part smaller than 50mm is deslimed in advance through the coal feeding system. The lower limit of the sieve hole of the desliming vibrating screen is 2mm, and the upper and lower coarse coal slime products are obtained;

[0040] b. Jig separation: the sieve top product of the desliming screen in step a is subjected to single-stage jigging separation through a jig machine to produce two products of gangue and clean coal, and the gangue directly enters the gangue bin; the clean coal is vibrated through the clean coal The sieve enters high-frequency vibration dehydration, and after dehydration, lump coal and fine coal are separated;

[0041] c. Lump coal dense medium separation: the dehydrated lump coal is crushed through a crusher to make the particle size less than 13mm, and then this part of lump coal is subje...

Embodiment 2

[0051] Based on the same principle and method, for the fine coal separation system, the present invention can replace the fine coal separation system in the process of embodiment 1 with the following process system:

[0052] The fine coal obtained after dehydration is subjected to hydraulic classification through a hydrocyclone, and the classification particle size is 0.35mm. Through classification, underflow and overflow can be obtained; the underflow of hydraulic classification is collected and sent to TBS for interference settlement separation, and medium coal and clean coal are obtained Two kinds of products; the clean coal directly enters the clean coal bunker to become a product, and the medium coal directly enters the medium coal bunker to become a product; the overflow obtained by hydraulic classification directly enters the thickener for concentration and pressure filtration, and the obtained overflow is directly circulated in the pool as circulating water It is used f...

Embodiment 3

[0054] Based on the same principle and method, for the fine coal separation system, the present invention can replace the fine coal separation system in the process of embodiment 1 with the following process system:

[0055] The fine coal obtained after dehydration is subjected to hydraulic classification through a hydrocyclone, and the classification particle size is 0.35mm. Through classification, the underflow and overflow can be obtained; the underflow of the hydraulic classification is collected and sent to the FC centrifugal dehydrator for centrifugal dehydration to obtain medium coal and centrifugal dehydration. The medium coal directly enters the medium coal bunker as a medium coal product, and the centrifuge re-enters the hydrocyclone for circular separation; the overflow obtained by hydraulic classification directly enters the thickener for concentrated filtration, and the obtained overflow is directly circulated in the pool Used as circulating water for coal washing,...

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Abstract

The invention provides a raw coal washing process capable of realizing non-polar ash conditioning. The process comprises the following steps: a, desliming and screening the part of raw coal with granularity less than 50 to 100mm; b, carrying out single stage jigging separation on screen products on a desliming screen; c, crushing lump coal obtained from the step b, namely screen products on an oscillating screen, by a crushing machine; d, feeding the crushed products from the step c into a three-product heavy medium cyclone for separation; e, respectively treating underflows and overflows obtained from a hydroclone in the step c; f, carrying out TBS separation or centrifugal dehydration treatment on the underflows of the hydroclone from the step e; g, respectively carrying out primary medium removal on clean coal, middlings coal and gangue obtained from the step d; h, respectively carrying out secondary medium removal and dehydration on the three products from the step g; and i, carrying out magnetic separation on undersize dilute medium obtained by secondary medium removal on the coal gangue in the clean coal in the step h, feeding the separated magnetite powder into a qualified medium tank, collecting residues, and carrying out coal slurry concentration.

Description

technical field [0001] The invention relates to a new coal washing method, in particular to a raw coal washing process capable of realizing stepless ash adjustment for a large amount of pulverized coal. Background technique [0002] At present, the commonly used coal washing processes in China mainly include jigging, dense medium, and flotation. Under normal circumstances, the lump coal part with a particle size greater than 13mm is mainly separated by the jigging process or the dense medium gangue removal process; the final coal part with a particle size between 13 and 0.5mm is generally separated by a dense medium cyclone; For the slime part below 0.5mm, it should be combined with the treatment of slime water to determine whether flotation is required according to user requirements. If flotation is required, the coal slime with a particle size of less than 0.5mm can be flotation, and a part of the flotation clean coal can be recovered, and the generated coal slime water c...

Claims

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Application Information

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IPC IPC(8): B03B7/00B03B9/00
Inventor 焦红光黄定国高艳阳潘兰英惠兵赵继芬
Owner HENAN POLYTECHNIC UNIV
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