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Recycling method of fine cleaned coal

A technology for recovery of fine coal and slime, which is applied in chemical instruments and methods, wet separation, solid separation, etc., can solve problems such as increased cost, large loss rate of magnetic ore powder, and reduced yield of clean coal, achieving high precision Improvement, stable product quality, and increased productivity

Active Publication Date: 2019-07-05
山西鑫畅远选煤科技股份有限公司
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Problems solved by technology

[0005] However, when the raw coal contains more than 12% of the final clean coal with a particle size of <0.5 mm, both of these two coal preparation methods have a reduction in the yield of clean coal, poor stability of clean coal ash, low tailings ash, and increased pollutants in disguise. , the defect of increased cost
If dense media is used for coal preparation, there are still problems such as large loss rate of magnetic ore powder and increased equipment wear rate.

Method used

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  • Recycling method of fine cleaned coal
  • Recycling method of fine cleaned coal
  • Recycling method of fine cleaned coal

Examples

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Effect test

Embodiment 1

[0062] (1) Raw coal enters the buffer bin through the grading and crushing workshop, and a desliming screen with a sieve gap of 1.5mm is installed under the buffer bin to obtain the above-sieve material and the under-sieve material.

[0063] (2) Through the high-pressure spraying device (the pressure is 0.3MPa), the material on the screen of the desliming screen is washed into the jigging coal washing machine or the dense medium cyclone for coal preparation to obtain gangue, medium coal and clean coal;

[0064] (3) Wherein, the clean coal enters the clean coal dewatering screen or the clean coal de-intermediation screen to obtain the material on the screen and the material under the screen;

[0065] (4) The undersize material of the desliming screen, and the undersize material of the clean coal dehydration screen or the clean coal dewatering screen enter the cyclone group through the slurry pump for classification, and the particles with a particle size of 0.25-1.5 mm enter the...

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Abstract

The invention provides a recycling method of fine cleaned coal. The recycling method includes the steps that a desliming screen and a spraying device are used for desliming raw coal, then a TBS interference bed, a cone tank and a spiral separator are used for sorting, and finally, the fine cleaned coal is obtained. Compared with adopting a coal jigging process or a dense medium coal separation process, the yield is increased by 2% or above; energy consumption and foaming agent consumption are lowered by 40%, subsequent collection agent consumption is lowered by 38%, flocculant consumption is lowered by 48%, and produced pollutants are lowered by 50%; and the quality of obtained fine cleaned coal products is stable, and the precision is improved.

Description

technical field [0001] The invention relates to the technical field of coal processing, in particular to a method for recycling fine coal. Background technique [0002] Fine coal is powdery clean coal, which is obtained by washing raw coal and removing gangue from coal. The final clean coal is usually separated by means of jigging coal preparation and dense medium coal preparation. [0003] Among them, jigging coal preparation refers to the process of coal preparation in a vertically pulsating medium according to the difference in particle density. The medium of jigging coal preparation is water or air, and some suspensions are also used. At present, hydraulic jigging is the most used in coal preparation. The commonly used equipment is the jig machine, which uses the principle of jig separation to sort the selected raw materials into clean coal, medium coal and gangue (calcium oxide) according to their density. [0004] Dense medium coal preparation is a gravity coal pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B9/00
CPCB03B7/00B03B9/005
Inventor 段建忠
Owner 山西鑫畅远选煤科技股份有限公司
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