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A high-water fast-setting gob-side entry retention material and its preparation and use methods

A technology of empty entry and high water, applied in the field of materials, can solve the problems of large amount of material used, slow solidification speed, easy layering of slurry and pipe plugging

Active Publication Date: 2021-10-22
河北充填采矿技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the large amount of solid materials used in the gob-side entry retention technology in the existing coal pillar-free mining, the solidification speed is slow, the slurry is easy to layer and block the pipe, the viscosity is too high, it cannot be fully mixed, and the strength of the consolidated body is low problem, the present invention provides a high-water fast-setting gob-side entry retention material and its preparation and use method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A high-water fast-setting gob-side entry retention material, including material A and material B;

[0039] Described former material comprises the raw material of following mass percentage:

[0040]Sulphoaluminate cement clinker 90%, sodium citrate 0.5%, cellulose ether 0.5%, sodium sulphoaluminate 4%, class II fly ash 5.0%;

[0041] Described second material comprises the raw material of following mass percentage:

[0042] 70% modified gypsum, 3% reinforcing agent and 27% lime;

[0043] The mass ratio of the first material, second material and water is 1:0.8.

[0044] Among them, the preparation method of sulphoaluminate cement clinker is: weigh 45% of limestone, 40% of bauxite and 15% of anhydrite, after mixing evenly, crush, homogenize, and grind to fineness ≤0.01mm, to obtain raw meal; after preheating the raw meal, it is calcined at 1300°C. After the calcining is completed, it is cooled by a grate cooler and then transported to the clinker bin to obtain sulphoal...

Embodiment 2

[0056] A high-water fast-setting gob-side entry retention material, including material A and material B;

[0057] Described former material comprises the raw material of following mass percentage:

[0058] Sulphoaluminate cement clinker 93%, sodium citrate 0.4%, cellulose ether 0.4%, sodium sulphoaluminate 3.7%, class II fly ash 2.5%;

[0059] Described second material comprises the raw material of following mass percentage:

[0060] Modified gypsum 80%, reinforcing agent 3.5% and lime 16.5%;

[0061] The mass ratio of described first material, second material and water is 1:1.

[0062] Among them, the preparation method of sulphoaluminate cement clinker is: weigh 48% of limestone, 35% of bauxite and 17% of anhydrite, mix them evenly, crush, homogenize, and grind to fineness ≤0.01mm, to obtain raw meal; after preheating the raw meal, it is calcined at 1400°C. After the calcining is completed, it is cooled by a grate cooler and then transported to the clinker bin to obtain s...

Embodiment 3

[0074] A high-water fast-setting gob-side entry retention material, including material A and material B;

[0075] Described former material comprises the raw material of following mass percentage:

[0076] Ferro-aluminate cement clinker 96%, sodium citrate 0.2%, cellulose ether 0.3%, sodium sulfoaluminate 3.5%;

[0077] Described second material comprises the raw material of following mass percentage:

[0078] Modified gypsum 85%, reinforcing agent 4% and lime 10.7%;

[0079] The mass ratio of described first material, second material and water is 1:1.2.

[0080] Among them, the preparation method of ferric aluminate cement clinker is: weigh 50% of limestone, 34% of ferrite and 16% of anhydrite, mix well, crush, homogenize, and grind to fineness ≤0.01mm, to obtain raw meal; after preheating the raw meal, calcining at 1250°C, after the calcining is completed, it is cooled by a grate cooler and transported to the clinker bin to obtain sulphoaluminate cement clinker;

[0081]...

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Abstract

The invention relates to the field of material technology, and specifically discloses a high-water fast-setting gobside entry retention material and a preparation and use method thereof. The high-water fast-setting gobside entry retention material includes material A and material B; the material A includes the following raw materials in mass percentages: 90-96% of aluminate cement clinker, 0.2-0.5% of sodium citrate, cellulose 0.3-0.5% ether, 3.5-4% sodium sulfoaluminate, 0-5% grade II fly ash; the second material includes the following raw materials in mass percentage: modified gypsum 70-85%, reinforcing agent 3-4% And the lime of surplus; The mass ratio of described first material and second material is 1:0.8-1.2. The high-water fast-setting gobside entry retaining material of the present invention has less solid material consumption, high compressive strength, simple preparation method, is not easy to block the pipeline during use, and the solidification time can be adjusted. The raw materials are non-toxic and harmless, and will not harm the soil and groundwater pollution.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a high-water fast-setting gob-side entry retention material and a preparation and use method thereof. Background technique [0002] In the mining work of coal mines in my country, a large number of traditional mining methods of retaining section coal pillars are still used. This mining method has low mining rate, poor ventilation conditions at the mining face, prominent dynamic disasters such as impact low pressure, and tense mining continuity. And there are many problems such as large safety hazards, and seriously affect the safety and efficient mining of coal mines, reduce the service life of mines, and affect the benefits of enterprises. [0003] With the advancement of science and technology, coal pillarless mining methods have emerged. Non-coal pillar mining refers to the mining technology that does not leave section coal pillars in the process of coal mining and adopts oth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14
CPCC04B28/144C04B2111/00017C04B2111/00724C04B2201/50C04B7/323C04B24/06C04B24/383C04B22/14C04B18/08C04B22/124C04B24/04C04B22/064
Inventor 孙春东秦大健王学伟卢志敏郝永超王英杨洪增董小娟
Owner 河北充填采矿技术有限公司