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Multi-stage screening and fine coal removal type preparation method of sized raw coal of power coal

A thermal coal and screening technology, applied in the fields of magnetic separation, chemical instruments and methods, sieves, etc., can solve the problems of low product quality, low washing rate, etc., and achieve low operating costs, significant economic benefits, and high processing capacity. big effect

Active Publication Date: 2021-07-23
SHENHUA BAOTOU ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It adopts 25 / 13mm classification, and the fine coal part below 13mm does not enter the sorting, and the washing rate is not high. Secondly, the above-mentioned process does not have a fine coal separation system, and the fine coal only has screening treatment, resulting in the quality of the product obtained by sorting. not tall

Method used

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  • Multi-stage screening and fine coal removal type preparation method of sized raw coal of power coal
  • Multi-stage screening and fine coal removal type preparation method of sized raw coal of power coal
  • Multi-stage screening and fine coal removal type preparation method of sized raw coal of power coal

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Effect test

Embodiment 1

[0033] like figure 2 As shown, the application of the method of the present invention is introduced below through a specific production example. This case is only for the convenience of understanding the solution of the present invention, and should not be interpreted as that the present invention is limited thereto:

[0034] A classification and selection method for steam coal multi-stage screening and powder removal, comprising the following steps:

[0035] Step A1: Raw coal enters the first rigid-flexible coupled sieve surface elastic vibrating screen for dry classification, the sieve size of which is 50mm, and the material > 50mm on the sieve enters the dense medium shallow groove separator for separation;

[0036] Step B1: The material <50mm under the first rigid-flexible coupling sieve surface elastic vibrating sieve enters the relaxation sieve for dry classification. The sieve surface vibrating screen is used for dry depowdering. The sieve hole size is 3mm. After depo...

Embodiment 2

[0043] Steps E2 to G2 of this embodiment are the same as Steps E1-G1 of Embodiment 1, except that in steps A2 to D2, the mesh size of the relaxation screen and the elastic vibrating screen with the second rigid-flexible coupling screen surface is 2 mm;

[0044] Specifically:

[0045] Step A2: The raw coal enters the first rigid-flexible coupled screen surface elastic vibrating screen for dry classification, the screen hole size is 50mm, and the material > 50mm on the screen enters the dense medium shallow groove separator for classification;

[0046] Step B2: The material <50mm under the elastic vibrating screen with rigid-flexible coupling screen surface enters the relaxation sieve for dry classification. The vibrating sieve is used for dry depowdering, the sieve hole size is 2mm, the 50-2mm material on the sieve after depowdering enters the dense medium shallow groove sorter for sorting, the material under the relaxation sieve and the 2mm rigid-flexible coupling elastic siev...

Embodiment 3

[0050] Steps E3 to G3 of this embodiment are the same as steps E1-G1 of Embodiment 1, except that in steps A3 to D3, the mesh size of the first rigid-flexible coupling screen elastic vibrating screen is 25mm;

[0051] Specifically:

[0052] Step A3: The raw coal enters the elastic vibrating screen with a rigid-flexible coupling screen surface for dry classification. The screen hole size is 25mm, and the material > 25mm on the screen enters the dense medium shallow groove separator for classification;

[0053] Step B3: The material <25mm under the elastic vibrating screen with rigid-flexible coupling screen surface enters the relaxation sieve for dry classification. The sieve size is 3mm. Carry out dry de-powdering, the sieve size is 3mm, the 25-3mm material on the sieve after de-powdering enters the dense medium shallow groove sorter for sorting, the material under the relaxation sieve and the 3mm rigid-flexible coupling elastic sieve surface vibrate The material under the si...

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Abstract

The invention discloses a multi-stage screening and fine coal removal type preparation method of sized raw coal of power coal. The method comprises the following steps that dry grading of one of 50mm, 25mm and 13mm is conducted on raw coal through a first rigid-flexible coupling elastic screen surface vibrating screen, oversize materials larger than 50 (25 / 13) mm are fed into a dense medium shallow slot sorting machine for sorting, and medium drainage and dewatering are conducted on light products and heavy products obtained after sorting to obtain clean coal and gangue products; undersize materials enter a flip-flow screen of 3 mm or 2 mm to be subjected to dry grading; the oversize material of the flip-flow screen enters a second rigid-flexible coupling elastic screen surface vibrating screen of 3mm or 2mm for dry fine coal removal, and the undersize material of second rigid-flexible coupling elastic screen surface vibrating screen of the 3mm or 2mm and the undersize material of the flip-flow screen of the 3mm or 2mm are used as a mixed coal product; and the light and heavy products obtained after the 50 (25 / 13)-3 (2) mm oversize materials are sorted by the dense medium shallow slot sorting machine are subjected to medium drainage and dewatering to obtain the clean coal and the gangue products. According to the multi-stage screening and fine coal removal type preparation method of sized raw coal of the power coal, the raw coal selection rate is high, the sorting precision is high, the load of a slime water system is small, and the method has the remarkable effect on treating viscous and wet power coal prone to argillization.

Description

technical field [0001] The invention relates to the technical field of coal separation, in particular to a classification and selection method for steam coal multi-stage screening and powder removal. Background technique [0002] Coal is my country's main primary energy source, the most economical, reliable and basic guarantee for my country's energy security and energy strategy, and has made a significant contribution to the development of my country's national economy. Efficient and clean processing and utilization of coal resources is an economical and effective method to reduce emissions of sulfur dioxide, nitrogen oxides and soot, a prerequisite for deep coal processing, and one of the key technologies for energy conservation and emission reduction. [0003] At present, thermal coal preparation plants mostly use raw coal for 13 (6) classification, and the >13mm is sorted and discharged by moving sieve jigging or dense medium shallow groove sorting machine. , the cle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B5/40B07B1/28B07B1/46B03C1/00
CPCB03B7/00B03B5/40B07B1/28B07B1/4609B03C1/00
Inventor 李明石建光孙银辉康永飞张虎伟熊树宝杨勇邓刚
Owner SHENHUA BAOTOU ENERGY CO LTD
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