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Alkali-activated high-water-content mine filling material based on synergism of multiple solid wastes and preparation method thereof

A mine filling and high-water type technology, applied in the field of building materials, can solve the problems that the scale of coal mine filling mining cannot meet the demand, the source of filling materials is insufficient, and hinder the large-scale promotion and application of coal mine filling mining technology, so as to facilitate large-scale promotion and application , flexible construction process, reduced damage effect

Pending Publication Date: 2021-08-24
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The available raw coal gangue rate in coal mines is about 20%, and the sources of filling materials in coal mines are insufficient, resulting in the scale of coal mine filling mining not meeting the demand, which seriously hinders the large-scale popularization and application of coal mine filling mining technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Initial cementitious materials: fly ash (dry basis) 23 parts, coal gasification slag (dry basis) 14 parts, carbide slag (dry basis) 21 parts, silicon calcium slag (dry basis) 22 parts, desulfurization gypsum (dry basis) 20 copies;

[0025] Grading of coal gangue aggregate: 52 parts of 0-5mm, 22 parts of 5-10mm, 26 parts of 10-16mm;

[0026] Alkali activator: the dosage of the alkali activator is 3.3% of the initial gelling material (dry basis), and NaOH in the activator: Na 2 SO 4 10H 2 O: KOH is 5:4:1;

[0027] Admixture: the amount of admixture is 0.12% of the initial gelling material (dry basis), and the retarder in the admixture: water reducing agent: water retaining agent 3:5:2;

[0028] Water-binder ratio: 8:1; bone-bone ratio: 5:1;

[0029] The fly ash, coal gasification slag, calcium carbide slag, calcium silicate slag, and desulfurized gypsum are wet-milled according to the above ratio, and the particle size after wet-milling is about 82% less than 100 mes...

Embodiment 2

[0031] Initial cementitious materials: fly ash (dry basis) 26 parts, coal gasification slag (dry basis) 18 parts, carbide slag (dry basis) 25 parts, silicon calcium slag (dry basis) 22 parts, desulfurization gypsum (dry basis) 9 copies;

[0032] Gangue aggregate gradation: 58 parts of 0-5mm, 25 parts of 5-10mm, 17 parts of 10-16mm;

[0033] Alkali activator: the dosage of the alkali activator is 5.4% of the initial gelling material (dry basis), and NaOH in the activator: Na 2 SO 4 10H 2 O: KOH is 6:3:1;

[0034] Admixture: the amount of admixture is 0.1% of the initial gelling material (dry basis), and the retarder in the admixture: water reducing agent: water retaining agent 5:3:2;

[0035] Water-binder ratio: 10:1; bone-bone ratio: 6:1;

[0036] The fly ash, coal gasification slag, calcium carbide slag, calcium silicate slag, and desulfurized gypsum are wet-milled according to the above ratio, and the particle size after wet-milling is about 85% less than 100 mesh. Add...

Embodiment 3

[0038] Initial cementitious materials: fly ash (dry basis) 25 parts, coal gasification slag (dry basis) 15 parts, carbide slag (dry basis) 30 parts, silicon calcium slag (dry basis) 15 parts, desulfurization gypsum (dry basis) 15 copies;

[0039] Gangue aggregate gradation: 62 parts of 0-5mm, 18 parts of 5-10mm, 20 parts of 10-16mm;

[0040] Alkali activator: the dosage of the alkali activator is 5.5% of the initial gelling material (dry basis), and NaOH in the activator: Na 2 CO 3 : KOH is 5:3:2;

[0041] Admixture: the amount of admixture is 0.9% of the initial gelling material (dry basis), and the retarder in the admixture: water reducing agent: water retaining agent 5:3:2;

[0042] Water-binder ratio: 12:1; bone-bone ratio: 5:1;

[0043] The fly ash, coal gasification slag, calcium carbide slag, calcium silicate slag, and desulfurized gypsum are wet-milled according to the above ratio, and the particle size after wet-milling is about 80% less than 100 mesh. Add the prim...

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Abstract

The invention discloses an alkali-activated high-water-content mine filling material based on synergism of multiple solid wastes and a preparation method thereof. The high-performance alkali-activated high-water-content mine filling material is prepared by fully utilizing coal gangue, fly ash, desulfurized gypsum, coal gasification slag, carbide slag and other coal-based solid wastes generated by coal mining and power generation and silicon-calcium slag generated by a fly ash alkali method aluminum extraction technology independently developed in recent years in China as main raw materials and matching with a certain amount of alkali activator. The processing process and the raw material ratio can be adjusted according to the transportation distance, the transportation mode and the pumping process, the characteristics of the solid wastes are completely performed, the synergistic enhancement effect is achieved, the utilization problem of the solid wastes is solved, and the alkali-activated high-water-content mine filling material prepared through the synergy of the multiple solid wastes has characteristics of good fluidity, high strength and low cost, and has wide application prospects. And large-scale popularization and application are facilitated.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to an alkali-activated high-water mine filling material based on the synergy of various solid wastes and a preparation method thereof. Background technique [0002] With the rapid growth of the world's economy and population, human demand for mineral resources is increasing day by day, and the solid waste and goaf produced by the massive mining of mineral resources pose a serious threat to the ecological environment and geological safety. Filling mining technology is a coal mining method that uses artificial filling of goaf instead of mining resources to support the overlying strata and control the fracture of the overlying strata. It can not only extract mineral resources, but also effectively control surface subsidence and protect ground buildings. At the same time, it also provides technical support for the mining of "three-down" pressed coal, which can realize the protective mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/04C04B18/06C04B18/12
CPCC04B28/144C04B18/065C04B18/0481C04B18/12C04B2111/00724C04B2201/50C04B18/08C04B22/062C04B22/10C04B22/147C04B2103/22C04B2103/302C04B2103/465Y02W30/91
Inventor 杨志杰闫长旺张德康栋张菊
Owner INNER MONGOLIA UNIV OF TECH
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