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Mine filling cementing material prepared by utilizing industrial by-product gypsum and preparation method for mine filling cementing material

An industrial by-product gypsum and mine filling technology, applied in the field of building materials, can solve problems such as occupying land and affecting the ecological environment, and achieve the effects of reducing damage, good mobility and low cost

Inactive Publication Date: 2016-07-13
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coal-fired power plants produce a large amount of fly ash, a large amount of coal gangue is produced during coal production and processing, and a large amount of solid waste steel slag is produced in steelmaking. The accumulation of these solid wastes takes up a lot of land and affects the surrounding ecological environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0020] A mine filling cementitious material prepared by industrial by-product gypsum, the parts by weight of each raw material are:

[0021] Industrial by-product gypsum: 54 parts; steel slag: 21 parts; coal gangue: 18 parts; fly ash: 19 parts, cement: 8 parts; activator: 5 parts; polycarboxylate superplasticizer: 0.8 parts; 0.2 parts; air-entraining agent: 0.18 parts, starch ether: 0.11 parts, water-material ratio: 0.44;

[0022] The industrial by-product gypsum is ground to a fineness greater than 300 mesh;

[0023] The coal gangue is crushed and screened, and the fineness is selected to be 5-70 mesh, and the crushed coal gangue with a fineness greater than 70 mesh is ground together with the steel slag to a fineness of 300 mesh.

[0024] The industrial by-product gypsum is the main component of desulfurization gypsum CaSO 4 2H 2 O.

[0025] Described exciter is alum, NaSO 4 , The combination of triethanolamine, the component ratio is 45:25:30.

[0026] A preparation m...

Embodiment example 2

[0029] A mine filling cementitious material prepared by industrial by-product gypsum, the parts by weight of each raw material are:

[0030] Industrial by-product gypsum: 45 parts; steel slag: 24 parts; coal gangue: 20 parts; fly ash: 13 parts, cement: 10 parts; part; air-entraining agent: 0.5 part, starch ether: 0.2 part, water-material ratio: 0.48;

[0031] The industrial by-product gypsum is ground to a fineness greater than 300 mesh;

[0032] The coal gangue is crushed and screened, and the fineness is selected to be 5-70 mesh, and the crushed coal gangue with a fineness greater than 70 mesh is ground together with the steel slag to a fineness of 300 mesh.

[0033] Further, the industrial by-product gypsum is phosphogypsum, the main component of which is CaSO 4 2H 2 O.

[0034] Further, the activator is alum, NaSO 4 , The combination of triethanolamine, the ratio of each component is 50:25:25.

[0035] A preparation method of mine filling cementitious material prepar...

Embodiment example 3

[0038] A mine filling cementitious material prepared by industrial by-product gypsum, the parts by weight of each raw material are:

[0039] Industrial by-product gypsum: 42 parts; steel slag: 26 parts; coal gangue: 15 parts; fly ash: 15 parts, cement: 11 parts; activator: 6 parts; sodium lignosulfonate superplasticizer: 0.8 parts; : 0.43 parts; air-entraining agent: 0.26 parts, starch ether: 0.25 parts, water-material ratio: 0.50;

[0040] The industrial by-product gypsum is ground to a fineness greater than 300 mesh;

[0041] The coal gangue is crushed and screened, and the fineness is selected to be 5-70 mesh, and the crushed coal gangue with a fineness greater than 70 mesh is ground together with the steel slag to a fineness of 300 mesh.

[0042] Further, the industrial by-product gypsum is citrate gypsum, the main component of which is CaSO 4 2H 2 O.

[0043] Further, the activator is alum, NaSO 4 , The combination of triethanolamine, the ratio is 30:25:45.

[0044]...

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Abstract

The invention discloses a mine filling cementing material prepared by utilizing industrial by-product gypsum, and provides a preparation method for the mine filling cementing material. The mine filling cementing material is prepared from the following raw materials in parts by weight: 42 to 56 parts of the industrial by-product gypsum, 16 to 28 parts of steel slag, 10 to 25 parts of coal gangue, 12 to 25 parts of coal ash, 6 to 12 parts of cement, 3 to 7 parts of an exciter, 0.5 to 2 parts of a water reducing agent, 0.1 to 1 part of a water retaining agent, 0.1 to 3 parts of an air entraining agent and 0.05 to 0.5 parts of starch ether, wherein the ratio of water to materials is 0.38 to 0.54. According to the mine filling cementing material prepared by utilizing the industrial by-product gypsum and the preparation method for the mine filling cementing material, resources are comprehensively utilized, the materials are taken in situ, and the mine filling cementing material is prepared by fully utilizing industrial solid waste; the mine filling cementing material is high in fluidity, stability, corrosion resistance and strength, has micro-expansibility and can fill fully and completely; a filling material is tightly combined with a ground surface rock stratum, and a complete stable geologic structure is recombined.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a mine filling cementitious material prepared by using industrial by-product gypsum and a preparation method thereof. Background technique [0002] Our country is vast in land and resources, rich in mineral resources. With the development of the economy, mine resources have been exploited excessively and uncontrollably for a long time, resulting in a rapid increase in the number of abandoned mines. Environmental disasters and geological disasters that have occurred, such as ground subsidence, cracking, and groundwater pollution, are occurring or are potentially occurring. Backfilling mines and pits is an important measure to protect the natural environment, improve the quality of life in mining areas, and improve land utilization. [0003] According to reports, there are hundreds of millions of tons of various industrial by-products of gypsum in my country at present, and ther...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B7/02C04B18/04C04B18/08C04B18/14C04B22/06C04B22/14C04B24/12C04B24/38C04B24/18C04B103/30C04B103/46
CPCC04B28/142C04B28/143C04B28/144C04B2103/302C04B2103/304C04B2103/465C04B7/02C04B18/142C04B18/08C04B18/0427C04B24/383C04B22/06C04B24/122C04B22/147C04B24/18Y02W30/91
Inventor 张国辉温海滨王慧
Owner UNIV OF JINAN
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