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Process for recycling fine coal from middlings

A clean coal and process technology, which is applied in the field of clean coal recovery from China Coal, can solve the problem that scarce coking coal resources cannot be recycled and reused, and achieve the effects of improving equipment utilization, significant economic benefits, and saving investment

Inactive Publication Date: 2017-05-17
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a medium coal recovery clean coal process to overcome the shortcomings of the traditional medium coal recovery clean coal process based on high separation accuracy, and fundamentally solve the existing scarce coking coal resources The problem of not being able to recycle

Method used

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  • Process for recycling fine coal from middlings
  • Process for recycling fine coal from middlings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 as shown, figure 2 for figure 1 The corresponding equipment contact diagram includes the following steps:

[0035] Step 1: Firstly, pass the middling coal through the media-removing sieve, and feed the mid-coal (with a particle size of 50-0.5mm) 1 on the media-removing sieve into the reversible hammer crusher A for crushing to 13 mm by belt or scraper transportation. For the following first-stage crushing product 2, feed the first-stage crushing product 2 to the reversible hammer crusher B for secondary crushing, and crush it to the second-stage crushing product 3 with a particle size below 5mm; crush the medium coal to below 5mm, which can reduce energy consumption , The crushing equipment adopts a reversible hammer crusher, which has a smaller over-crushing amount than the two-stage dissociation device, and the -0.25mm yield can be reduced by about 16%, which reduces the unreasonable impact of medium coal recovery on the existing flotation system. ...

Embodiment 2

[0040] The addition of flotation agent 6 in step 3 in Example 1 is that the addition of diesel oil in per ton of overflow is 1000g, and the addition of foaming agent is 50g.

Embodiment 3

[0042] The addition of flotation reagent 6 in step 3 in embodiment 1 is that the addition of diesel oil in per ton of overflow is 700g, and the addition of foaming agent is 80g.

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Abstract

The invention relates to a process for recycling fine coal from middlings. The process comprises the following steps: feeding the middlings into crushing equipment and crushing the middlings until the sizes of the middlings are below 6 mm; mixing the crushed middlings with coarse middlings slurry, then feeding the mixture into classifying equipment and carrying out 0.25 mm classification to generate overflow formed by -0.25 mm materials and bottom flow formed by +0.25 mm materials, wherein -0.25mm shows that the particle size is smaller than 0.25 mm, and +0.25 mm shows that the particle size is greater than 0.25 mm; mixing the overflow and a flotation reagent, then feeding the mixture into pulp mixing equipment and carrying out pulp mixing to form ore pulp, carrying out flotation on the ore pulp by using flotation equipment to generate flotation fine coal and flotation tailings, and recycling the flotation fine coal; and feeding the bottom flow into coal slime gravity concentrating equipment, carrying out separation to generate fine coal and tailings, and recycling the fine coal. The technological process is simple, the cost is low, the benefic is good, and the process has significance on full utilization and protection of scarce coking coal resources and ensuring of safety of national energy.

Description

technical field [0001] The invention relates to the technical field of coal separation, in particular to a process for recovering clean coal from middling coal. Background technique [0002] With the rapid development of my country's economy, the country's continuous increase in steel demand has led to a rapid increase in the demand for coking coal. The total amount of coal resources in my country is abundant, but the reserves of coking coal resources are less than 1 / 3 of the total reserves, and high-quality coking coal with good coking characteristics and low ash and sulfur content is even rarer. There are more than 1,000 coking coal preparation plants in my country, and the average yield of coking medium coal produced each year is above 30%. Because the ash content of this part of coking coal is close to that of raw coal, although it contains a certain amount of combustibles, it cannot reach the level of coking coal. It is often used as steam coal due to the requirements o...

Claims

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Application Information

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IPC IPC(8): B03B9/00B03B1/00B02C13/00
CPCB02C13/00B03B1/00B03B9/005
Inventor 王大鹏杨建国桂夏辉冉进财张文韬
Owner CHINA UNIV OF MINING & TECH
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