Phosphogypsum-based grouting material for filling solution cavity of mine

A grouting material and phosphogypsum technology, applied in the field of grouting material and mine karst cave filling grouting material, can solve the problems of reducing efficiency, increasing the economic cost of phosphogypsum-based grouting material, restricting the use range of phosphogypsum, and achieving high mechanical properties. Effect

Inactive Publication Date: 2016-07-13
五矿二十三冶建设集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This increases the economic cost of using phosphogypsum-based grouting materials in mine cave filling, reduces efficiency, and restricts the scope of use of phosphogypsum

Method used

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  • Phosphogypsum-based grouting material for filling solution cavity of mine
  • Phosphogypsum-based grouting material for filling solution cavity of mine
  • Phosphogypsum-based grouting material for filling solution cavity of mine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Each component and weight percentage thereof are in the present embodiment:

[0029]

[0030]

[0031] Phosphogypsum, fly ash, Portland cement, quicklime, microsilica, sodium aluminate, and methyl cellulose ether in the above components are prepared according to the aforementioned process to obtain grouting material powder. Add tap water of 0.20% powder quality, and add the early strength agent (triethanolamine) and water reducer (polycarboxylate water reducer) of the above ratio into the water, and stir for 3 minutes to obtain a flowable slurry. Its initial fluidity reaches 320mm, and it reaches final setting in 200 minutes. Its 7d strength is 14MPa, 14d strength is 18MPa, 28d strength is 21MPa, and the softening coefficient is 0.71.

Embodiment 2

[0033] Each component and weight percentage thereof are in the present embodiment:

[0034]

[0035] Phosphogypsum, fly ash, Portland cement, quicklime, microsilica, sodium aluminate, and methyl cellulose ether in the above components are prepared according to the aforementioned process to obtain grouting material powder. Add tap water of 0.22% powder quality, and add the early strengthening agent (triethanolamine) and water reducer (polycarboxylate water reducer) of the above ratio into the water, and stir for 3 minutes to obtain a flowable slurry. Its initial fluidity reaches 280mm, and it reaches final setting in 180 minutes. Its 7d strength is 10MPa, 14d strength is 13MPa, 28d strength is 17MPa, and the softening coefficient is 0.70.

Embodiment 3

[0037] Each component and weight percentage thereof are in the present embodiment:

[0038]

[0039]

[0040] Phosphogypsum, fly ash, Portland cement, quicklime, microsilica, sodium aluminate, and methyl cellulose ether in the above components are prepared according to the aforementioned process to obtain grouting material powder. Add tap water of 0.21% powder mass, and add the above-mentioned ratio of early strengthening agent (triethanolamine) and water reducer (polycarboxylate water reducer) into the water, and stir for 2 minutes to obtain a flowable slurry. Its initial fluidity reaches 300mm, the final setting time is 160min, its strength at 7d is 11MPa, its strength at 14d is 14MPa, its strength at 28d is 20MPa, and its softening coefficient is 0.74.

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Abstract

The invention discloses a phosphogypsum-based grouting material for filling a solution cavity of a mine. The grouting material is prepared from a powder material and a liquid material, wherein, calculated by the total weight, in percentage by weight, of the grouting material, the powder material is prepared from 65 to 75 percent of phosphogypsum, 5 to 15 percent of pulverized fuel ash, 4 to 10 percent of cement, 2.5 to 5 percent of unslaked lime, 2.5 to 5 percent of micro silica fume, 0.4 to 0.5 percent of setting accelerator sodium aluminate and 0.03 to 0.05 percent of water-retaining agent methyl cellulose ether, and the liquid material is prepared from 0.8 to 1.1 percent of polycarboxylate superplasticizer and 0.03 to 0.05 percent of early strength agent triethanolamine. The phosphogypsum-based grouting material for filling the solution cavity of the mine can be directly used for filing and grouting a solution cavity of an abandoned mine shaft, and has the characteristics of high fluidity, good workability, acid resistance, erosion resistance, higher later strength and the like.

Description

technical field [0001] The invention relates to a grouting material in the technical field of building materials, in particular to a phosphogypsum-based grouting material for filling caves in mines. Background technique [0002] The treatment and utilization of phosphogypsum is a worldwide problem. my country is the world's largest producer of phosphate fertilizer and the largest by-product of phosphogypsum. Due to the huge output of phosphogypsum and the limited market capacity of phosphogypsum comprehensive utilization products, it is still impossible to fully utilize phosphogypsum at present. Due to the large stockpiles of phosphogypsum and the occupation of a large amount of land resources, the treatment of phosphogypsum has become an urgent and important issue. In the 2009 Energy Conservation and Emission Reduction Work Plan of the State Council, the comprehensive utilization of phosphogypsum was listed as a key resource project. [0003] On the other hand, various mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/14C04B2111/70C04B18/08C04B7/00C04B7/34C04B14/062C04B24/24C04B24/386C04B24/122C04B22/08
Inventor 刘宁陈嘉康陈兵
Owner 五矿二十三冶建设集团有限公司
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