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Clean utilization method of coal slime generated in coal mining process

A technology of mining process and coal slime, which is applied in the field of clean utilization of coal slime, can solve problems such as unsatisfactory utilization of coal slime, achieve good heat insulation effect, improve adaptability, and have wide application prospects

Active Publication Date: 2019-10-18
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a clean utilization method of coal slime produced in the process of coal mining, which solves the problem of unsatisfactory utilization of coal slime in the prior art

Method used

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  • Clean utilization method of coal slime generated in coal mining process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for clean utilization of coal slime produced in a coal mining process, comprising the following steps:

[0026] S1, take by weight 80 parts of coal slime, 5 parts of brucite fiber, 1 part of borax, Sb 2 o 3 0.5 parts, 1 part of bis(2-ethylhexyl) phthalate;

[0027] S2, mixing and pulverizing the coal slime and borax weighed in S1 and passing through a 100-mesh sieve to obtain a mixture A;

[0028] S3, add the brucite fiber, Sb weighed in step 1 to the mixture A 2 o 3 And bis(2-ethylhexyl) phthalate, mixed uniformly to obtain mixture B;

[0029] S4, granulating the mixture B to obtain raw pellets with a particle size of 5 mm;

[0030] S5, pre-roasting the raw material balls at 400°C for 30 minutes in a nitrogen atmosphere, and then alternately roasting them twice at 800°C and 1000°C for 20 minutes each time after the pre-roasting is completed to obtain ceramsite.

Embodiment 2

[0032] A method for clean utilization of coal slime produced in a coal mining process, comprising the following steps:

[0033] S1, take by weight 90 parts of coal slime, 8 parts of brucite fiber, 2 parts of borax, Sb 2 o 3 1 part, 0.5 part of bis(2-ethylhexyl) phthalate;

[0034] S2, mixing and pulverizing the coal slime and borax weighed in S1 and passing through a 100-mesh sieve to obtain a mixture A;

[0035] S3, add the brucite fiber, Sb weighed in step 1 to the mixture A 2 o 3 And bis(2-ethylhexyl) phthalate, mixed uniformly to obtain mixture B;

[0036] S4, granulating the mixture B to obtain raw pellets with a particle size of 8mm;

[0037] S5, pre-roasting the raw meal balls at 450°C for 30 minutes in an argon atmosphere, and then alternately roasting them twice at 900°C and 1050°C for 25 minutes each time after the pre-roasting is completed to obtain ceramsite.

Embodiment 3

[0039] A method for clean utilization of coal slime produced in a coal mining process, comprising the following steps:

[0040] S1, take by weight 100 parts of coal slime, 10 parts of brucite fiber, 3 parts of borax, Sb 2 o 3 0.5 parts, 0.5 parts of bis(2-ethylhexyl) phthalate;

[0041] S2, mixing and pulverizing the coal slime and borax weighed in S1 and passing through a 100-mesh sieve to obtain a mixture A;

[0042] S3, add the brucite fiber, Sb weighed in step 1 to the mixture A 2 o 3 And bis(2-ethylhexyl) phthalate, mixed uniformly to obtain mixture B;

[0043] S4, granulating the mixture B to obtain raw pellets with a particle size of 10 mm;

[0044] S5, pre-roasting the raw meal balls at 500°C for 30 minutes in a nitrogen atmosphere, and then alternately roasting them twice at 1000°C and 1100°C, each time for 30 minutes, to obtain ceramsite.

[0045] In order to further illustrate the effects of the present invention, the present invention also provides comparati...

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Abstract

The invention discloses a clean utilization method of coal slime generated in a coal mining process. The clean utilization method comprises the following steps: weighing coal slime, brucite fibers, borax, Sb2O3 and bis(2-ethylhexyl) phthalate; mixing the coal slime and the borax, and then carrying out crushing to obtain a mixture A; adding the brucite fibers, the Sb2O3 and the bis(2-ethylhexyl) phthalate into the mixture A, and carrying out uniform mixing to obtain a mixture B; granulating the mixture B to obtain raw material balls; and pre-roasting the raw material balls at 400-500 DEG C for30 minutes, and alternately roasting the raw material balls at 800-1000 DEG C and 1000-1100 DEG C twice to obtain ceramsite. According to the method, the ceramsite is prepared from the coal slime, theceramsite with excellent functions is prepared by utilizing the characteristics of the coal slime, and the prepared ceramsite is good in mechanical property and good in heat insulation effect, can beused as coarse aggregate or fine aggregate to be applied to a preparation process of concrete, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of coal slime processing and reuse, and in particular relates to a clean utilization method of coal slime produced in the coal mining process. Background technique [0002] my country is the main coal production and consumption country in the world. Coal is the main energy source of our country. Coal washing and processing is an important content of clean coal industry technology. Through coal washing, not only can remove or reduce the ash contained in raw coal, Gangue, sulfur and other impurities can also be divided into different varieties and grades according to different coal types, ash content, calorific value and particle size to meet different use needs. [0003] The coal washing waste discharged after coal washing and processing is coal slime. Because of its small particle size, strong water holding capacity, many clay minerals, and low calorific value, the coal slime has low commodity value and is di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B33/36C04B33/13C04B38/00C04B38/02
CPCC04B33/132C04B33/131C04B33/1328C04B33/1305C04B33/36C04B38/02C04B2235/5216C04B2235/3409C04B2235/3294C04B2235/9607C04B38/0087C04B38/00Y02P40/60
Inventor 陈立伟许彦鹏王林高保彬裴蓓吕晓来袁军伟刘军陈海栋李昊杨万里何浩宇
Owner HENAN POLYTECHNIC UNIV
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