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Coal gangue-based mine filling material and preparation method thereof

A technology of mine filling and coal gangue, which is applied in the field of filling material ratio prepared from spontaneous combustion coal gangue, can solve the problems of unstable performance and high cost, achieve good mechanical properties, reduce costs, and improve resource utilization

Pending Publication Date: 2022-05-31
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the rapid development of my country's coal industry, filling mining technology is also gradually popularized and applied. However, at present, the filling cementitious material is mainly Portland cement, and crushed coal gangue is used as aggregate, which is not only costly, but also has unstable performance. Therefore, there is an urgent need to develop a new type of cementitious material to solve the existing problems. Selecting coal gangue and slag to prepare the cementitious material can make full use of the solid waste discharged into the natural environment, which not only solves the problem of gangue stockpiling, but also reduces The cost of filling the mining process has realized the green and sustainable development of the coal industry

Method used

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  • Coal gangue-based mine filling material and preparation method thereof
  • Coal gangue-based mine filling material and preparation method thereof
  • Coal gangue-based mine filling material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) First crush and screen the large pieces of coal gangue with a jaw crusher, so that the particle size of the screened coal gangue is distributed in the range of 0-13.2mm, wherein the particle size range is 4.75-13.2mm Coal gangue is used as coarse aggregate, and coal gangue with a particle size range of less than 4.75 mm is used as fine aggregate; the effective chemical composition of the coal gangue is: SiO 2 : 55.19%, Al 2 o 3 : 13.64%.

[0024] (2) Weigh 7kg of fine aggregate in step (1), put it into a ball mill and grind it for 30min, then sieve it with 270 mesh and 300 mesh standard sieves, and obtain the coal gangue powder with particle diameter less than 300 mesh for subsequent use;

[0025] (3) Weighing 3 kg of slag and mixing it with the gangue powder in step (2) and stirring for 2 minutes, and obtaining the gelled material after thorough mixing.

[0026] (4) Weigh 12 kg of coal gangue with coarse particle size and 18 kg of coal gangue with fine particle ...

Embodiment 2

[0032] (1) First crush and screen the large pieces of coal gangue with a jaw crusher, so that the particle size of the screened coal gangue is distributed in the range of 0-13.2mm, wherein the particle size range is 4.75-13.2mm Coal gangue is used as coarse aggregate, and coal gangue with a particle size range of less than 4.75 mm is used as fine aggregate; the effective chemical composition of the coal gangue is: SiO 2 : 55.19%, Al 2 o 3 : 13.64%.

[0033] (2) Weigh 8.5kg of fine aggregate in step (1), be placed in ball mill and grind for 30min, then sieve with 270 mesh, 300 mesh standard sieve, obtain particle diameter less than 300 mesh coal gangue powder for subsequent use;

[0034] (3) Weighing 1.5 kg of slag and mixing it with the gangue powder in step (2) and stirring for 2 minutes, and obtaining the gelled material after thorough mixing.

[0035] (4) Weigh 12 kg of coal gangue with coarse particle size and 18 kg of coal gangue with fine particle size in step (1), mi...

Embodiment 3

[0041] (1) First crush and screen the large pieces of coal gangue with a jaw crusher, so that the particle size of the screened coal gangue is distributed in the range of 0-13.2mm, wherein the particle size range is 4.75-13.2mm Coal gangue is used as coarse aggregate, and coal gangue with a particle size range of less than 4.75 mm is used as fine aggregate; the effective chemical composition of the coal gangue is: SiO 2 : 55.19%, Al 2 o 3 : 13.64%.

[0042] (2) Weigh 7kg of fine aggregate in step (1), put it into a ball mill and grind it for 30min, then sieve it with 270 mesh and 300 mesh standard sieves, and obtain the coal gangue powder with particle diameter less than 300 mesh for subsequent use;

[0043] (3) Weighing 3 kg of slag and mixing it with the gangue powder in step (2) and stirring for 2 minutes, and obtaining the gelled material after thorough mixing.

[0044] (4) Weigh 12 kg of coal gangue with coarse particle size and 18 kg of coal gangue with fine particle ...

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Abstract

The invention discloses a filling body doped with coal gangue and slag. The filling body is prepared from 70%-100% of coal gangue powder and 0-30% of slag, the mass ratio of fine-particle-size gangue to coarse-particle-size gangue is (1-2.3): 1, the bone-glue ratio is 3-5, the mass concentration is 81%-83%, and the mass ratio of an alkali activator NaOH to a cementing material is (2-6): 100. And pouring the excitation solution into the material to obtain the filling slurry. The coal gangue powder and the slag are used for preparing the cementing material, the coal gangue is added for preparing the filling body, the strength and fluidity requirements of the filling body are met, the production cost is reduced, and the environmental problem caused by mining is solved. The slurry is applied to mine filling and has certain practical significance.

Description

technical field [0001] The invention relates to the technical field of filling materials, in particular to a method for preparing filling materials from spontaneously combusted coal gangue. Background technique [0002] Coal is the conventional energy with the most reserves and the widest distribution in the world, and it is also an extremely important strategic resource. The mining of coal has formed many goafs, causing problems such as land subsidence, which has greatly affected the daily life of the people and the mining enterprises. Normal production has brought serious impact; a large amount of solid waste, such as coal gangue, slag, etc., is produced in the production process of mining and industry; the stockpiling of solid waste has brought serious ecological and environmental crises, and the solid waste is collected by mine filling Filling into the goaf can not only solve the environmental pollution problem caused by solid waste stockpiling, but also effectively main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B7/24C04B7/153C04B18/12
CPCC04B28/00C04B7/24C04B7/1535C04B18/12C04B2111/00017C04B2111/00724C04B2201/50C04B22/062Y02W30/91
Inventor 孙琦马瑞峰
Owner LIAONING TECHNICAL UNIVERSITY
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