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Coal slime cementitious material used in mine filling

A technology of cementitious materials and coal slime, which is applied in the field of mine filling materials, can solve problems such as poor workability, slow final strength, and strength increase, and achieve the effects of reducing capital investment, high promotion value, and reducing usage

Active Publication Date: 2021-02-23
SHANDONG ANSHI GREEN MINING TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 3. High viscosity
[0006] Since the early 1980s, paste backfill technology has been developed abroad. Some coal mines at home and abroad have used coal slime to prepare paste slurry to backfill gobs. Disadvantages such as large size, poor workability, high bleeding rate, slow strength rise and low final strength

Method used

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  • Coal slime cementitious material used in mine filling
  • Coal slime cementitious material used in mine filling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A new coal slime cementitious material for mine filling:

[0039] Fine coal powder (particle size below 10mm), coal slime, Portland cement and special additives are mixed with water to make a paste with good fluidity, and the paste is used as filling material.

[0040] Among them, the special additive is composed of the following raw materials in parts by weight: 45 parts of rheological agent, 15 parts of reinforcing and compacting agent, 20 parts of expansion agent, and 10 parts of anti-seepage agent.

[0041] The rheological agent is composed of the following raw materials in parts by weight: 2 parts of triethanolamine, 4 parts of polycarboxylate superplasticizer, and 1 part of naphthalene-based superplasticizer.

[0042] The reinforcing and compacting agent is composed of the following raw materials in parts by weight: 4 parts of silica fume, 1.5 parts of calcium carbonate powder, and 5 parts of calcium chloride.

[0043] The expansion agent is composed of the follo...

Embodiment 2

[0050] Same as Example 1, except that the special additive is composed of the following raw materials in parts by weight: 30 parts of rheological agent, 10 parts of reinforcing and compacting agent, 10 parts of expansion agent, and 5 parts of anti-seepage agent.

[0051] The rheological agent is composed of the following raw materials in parts by weight: 1 part of triethanolamine, 2 parts of polycarboxylate superplasticizer, and 1 part of naphthalene-based superplasticizer.

[0052] The reinforcing and compacting agent is composed of the following raw materials in parts by weight: 2 parts of silica fume, 1 part of calcium carbonate powder, and 4 parts of calcium chloride.

[0053] The expansion agent is composed of the following raw materials in parts by weight: 3 parts of aluminate cement clinker, 5 parts of fine slag powder, 12 parts of alumina clinker, and 1 part of desulfurized gypsum powder.

[0054] The anti-seepage agent is composed of the following raw materials in par...

Embodiment 3

[0056] Same as Example 1, except that the special additive is composed of the following raw materials in parts by weight: 60 parts of rheological agent, 20 parts of reinforcing and compacting agent, 25 parts of expansion agent, and 15 parts of anti-seepage agent.

[0057] The rheological agent is composed of the following raw materials in parts by weight: 3 parts of triethanolamine, 5 parts of polycarboxylate superplasticizer, and 1 part of naphthalene-based superplasticizer.

[0058] The reinforcing and compacting agent is composed of the following raw materials in parts by weight: 5 parts of silica fume, 2 parts of calcium carbonate powder, and 6 parts of calcium chloride.

[0059] The expansion agent is composed of the following raw materials in parts by weight: 3 parts of aluminate cement clinker, 8 parts of slag fine powder, 15 parts of alumina clinker, and 1 part of desulfurized gypsum powder.

[0060] The anti-seepage agent is composed of the following raw materials in ...

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Abstract

The invention relates to a novel mineral coal slime cementing material for filling mining. According to the novel mineral coal slime cementing material, a filling material is manufactured by adoptingfine coal powder, coal slime, portland cement and a special additive as raw materials; and the special additive is constituted by a rheological agent, an enhancing compacting agent, an expanding agentand an anti-seepage agent. According to the filling raw material, the coal powder and the coal slime are selected as the main raw materials, fund investment of filling mining is lowered to a certainextent, the effect of turning waste into wealth is achieved, and the novel mineral coal slime cementing material has the great significance for construction of national green mines, and high popularization value in the technical field.

Description

technical field [0001] The invention belongs to the field of mine filling materials, in particular to a novel coal slime gelling material for mine filling and development. Background technique [0002] Coal slime is a semi-solid formed by pulverized coal containing water in the coal production process. Coal slime has the following characteristics: [0003] 1. The particle size is fine and the particle content is high, especially the particles smaller than 200 mesh account for about 70% to 90%. [0004] 2. Strong water holding capacity and high moisture content. The water content of the coal slime dehydrated by the disc vacuum filter is generally more than 30%; the water content of the coal slime dehydrated by the folding belt filter is 26% to 29%; the water content of the coal slime dehydrated by the filter press is 20% to 24%. [0005] 3. High viscosity. Because coal slime generally contains more clay minerals, coupled with high moisture content and fine particle size co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06
CPCC04B28/06C04B2201/50C04B14/022C04B24/122C04B2103/302C04B22/124C04B18/146C04B14/28C04B18/064C04B18/141C04B7/32C04B12/04C04B22/066C04B24/2623
Inventor 王国军王清华侯秀贞梁艳红韩学海闫甫石全德张霞来庆新孙凯李蒙蒙王晓菡修玲芳韦一李丽杨志豪王传琪刘乐张盛敏岳志伟马继滨安伯超吕学强
Owner SHANDONG ANSHI GREEN MINING TECH DEV