High-pressure roll selective smashing and sorting method for middlings

A high-pressure roller and selective technology, applied in chemical instruments and methods, solid separation, wet separation, etc., can solve problems such as combustion instability, boiler efficiency reduction, environmental pollution, etc., to reduce coal transportation costs, reasonable recovery and Utilization, the effect of a high degree of product dissociation

Inactive Publication Date: 2013-11-13
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When medium coal is directly used as fuel, it is unfavorable to the operation of the boiler. In addition to the reduction of boiler efficiency, there are also phenomena such as a significant drop in temperature, unstable combustion, and deterioration of liquid slag discharge,

Method used

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  • High-pressure roll selective smashing and sorting method for middlings
  • High-pressure roll selective smashing and sorting method for middlings
  • High-pressure roll selective smashing and sorting method for middlings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The raw coal is coking coal with an ash content of 18.59%. The coal washing plant is a mine-type coal washing plant with a processing capacity of 4 million t / a. The high-pressure roller mill is used to carry out ultra-fine crushing of medium coal and then sorting. The process steps are as follows:

[0024] (1) Raw coal enters a sieve with a sieve hole of 200mm. The material on the sieve is crushed by a double-toothed roller crusher and combined with the material under the sieve, and then enters a desliming sieve with a sieve hole of 0.5mm. The material on the mud sieve enters the vertical wheel heavy-medium separator, and the clean coal I, medium coal I and gangue I are sorted out, and the clean coal I is transported to the clean coal bunker, and the gangue I is transported to the gangue hill;

[0025] (2) Midcoal Ⅰ enters a sieve with a sieve hole of 50mm. The material on the sieve is crushed by a jaw crusher and combined with the material under the sieve for ultra-fin...

Embodiment 2

[0029] The raw coal is coking coal with an ash content of 39.75%. The coal washing plant is a group-type central coal washing plant with a processing capacity of 5 million t / a. The high-pressure roller mill is used to carry out ultra-fine crushing of medium coal and then sorting. The process steps are as follows:

[0030] (1) Raw coal enters a sieve with a sieve hole of 50mm. The material on the sieve is crushed by a double-toothed roller crusher and combined with the material under the sieve, and then enters a desliming sieve with a sieve hole of 0.5mm. The material on the mud screen enters the three-product dense medium cyclone, and the clean coal I, medium coal I and gangue I are sorted out, the clean coal I is transported to the clean coal bin, and the gangue I is transported to the gangue hill;

[0031] (2) China Coal I carries out high-pressure roller mill ultra-fine crushing, the pressure between the rollers is 4.0MPa, the roller speed is 2.0m / min, and the roller gap is...

Embodiment 3

[0035] The raw coal is coking coal with an ash content of 19.40%. The coal washing plant is a mine-type coal washing plant with a processing capacity of 3 million t / a. The high-pressure roller mill is used to carry out ultra-fine crushing of medium coal and then sorting. The process steps are as follows:

[0036] (1) Raw coal enters a sieve with a sieve hole of 50 mm. The material on the screen is crushed by a double-toothed roller crusher and combined with the material under the screen to enter the jig separator to separate clean coal I, medium coal I and gangue Ⅰ, clean coal Ⅰ is transported to the clean coal bunker, and gangue Ⅰ is transported to the gangue hill;

[0037] (2) China Coal I carries out high-pressure roller mill ultra-fine crushing, the pressure between the rollers is 6.0MPa, the roller speed is 1.0m / min, and the roller gap is 13mm; the crushed material enters the sieve with a sieve hole of 13mm, and the material on the sieve Combined with the high-pressure rol...

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Abstract

The invention relates to a high-pressure roll selective smashing and sorting method for middlings, and belongs to the technical field of mineral processing. The method comprises the following steps of: (1) smashing raw coal until the granularity is less than the upper limit of selected granularity suitable for a follow-up cleaning unit, desliming, and enabling the deslimed raw coal to enter resorting equipment to obtain clean coal I, middlings I and gangue I; (2) smashing the middlings I until the granularity is less than the upper limit of smashing granularity suitable for a high-pressure roller mill, carrying out high-pressure roller milling ultrafine smashing, desliming products subjected to ultrafine smashing, enabling the deslimed products to enter the resorting equipment to obtain clean coal II, middlings II and gangue II, wherein the middlings II return to the high pressure roller mill to be mixed with the middlings I so as to be smashed and sorted; (3) carrying out flotation on the coal slime after concentration and size mixing so as to obtain flotation clean coal and flotation tailing. Compared with conventional middlings smashing processes, the method disclosed by the invention is high in product dissociation degree and good in subsequent resorting effect, can be used for improving the clean coal yield, enabling coal resources to be sufficiently and reasonably recycled and utilized, and reducing resource waste.

Description

technical field [0001] The invention relates to a processing technology for washing middling coal, in particular to a high-pressure roller selective crushing and sorting method for middling coal. Background technique [0002] Coal is the energy resource with the widest distribution and the largest reserves in my country, and occupies an extremely important position in my country's national economic and social development. Although my country has abundant coal resources, the distribution of coal types and quantities is extremely unbalanced, and major coking coals such as fat coal, coking coal, and lean coal are scarce. According to statistics, in addition to lignite accounting for 12.7% of the proven reserves, in hard coal, low metamorphic bituminous coal accounted for 42.4% of the total, and lean coal and anthracite accounted for 17.3%. The amount of medium-metamorphic bituminous coal is small, accounting for only 27.6%, and most of them are gas coal, accounting for 46.9% o...

Claims

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Application Information

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IPC IPC(8): B02C21/00B02C23/12B03B7/00
Inventor 侯英
Owner UNIV OF SCI & TECH LIAONING
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