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A new type of shotcrete material and its application method for suppressing spontaneous combustion of waste rock

A gangue hill and shotcrete technology, applied in the field of coal gangue hill spontaneous combustion fire-extinguishing materials, can solve the problems of inconvenient grouting holes, difficult operation and high treatment cost, and achieve the effect of good slope protection, reducing possibility and protecting groundwater

Active Publication Date: 2021-12-03
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the process of controlling the spontaneous combustion of gangue hills by grouting method, grouting holes need to be drilled on the top and slope of gangue hills. There are certain requirements for slope angle and slope height. The slope height of each level is less than 10 meters, and the accumulation angle of repose is less than 30°; For some gangue hills with long slopes and large slope angles, it is not convenient to drill grouting holes during the grouting process, the operation is difficult, there are many safety hazards, and the treatment cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 600g of fly ash, 100g of desulfurized gypsum, 100g of silica fume powder, 100g of calcium carbide mud, and 100g of cement, add 15g of chopped glass fiber with a length of 15mm, add 50g of composite admixture, add 700g of water, stir evenly, and use cement glue The fluidity measured by the sand fluidity tester is 98mm, the water separation rate of the slurry is 3.7% in 3 hours, and 4.4% in 6 hours. Pour the slurry into the mortar triple test mold of 70.7*70.7*70.7, put it together with the test mold in an environment with a temperature of (20±2)°C and a relative humidity of ≥50%, remove the mold after 48 hours, and place the test block at a temperature of ( 20 ± 1) ℃, relative humidity not lower than 90% in the curing box, test the compressive strength of the test block in the 3d, 7d, 28d periods are 3.9Mpa, 9.8Mpa, 17.8Mpa respectively, and the softening coefficient after 28d is 0.91 .

Embodiment 2

[0031] Weigh 550g of fly ash, 120g of desulfurized gypsum, 80g of silica fume powder, 70g of calcium carbide mud, and 80g of cement, add 13g of chopped glass fiber with a length of 15mm, add 60g of composite admixture, add 750g of water, stir evenly, and use cement glue The fluidity measured by the sand fluidity tester is 104mm, the water separation rate of the slurry is 3.3% in 3 hours, and 4.1% in 6 hours. Pour the slurry into the mortar triple test mold of 70.7*70.7*70.7, put it together with the test mold in an environment with a temperature of (20±2)°C and a relative humidity of ≥50%, remove the mold after 48 hours, and place the test block at a temperature of ( 20 ± 1) ℃, relative humidity not less than 90% in the curing box, test the compressive strength of the test block in the 3d, 7d, 28d periods are 3.6Mpa, 8.9Mpa, 17.3Mpa respectively, and the softening coefficient after 28d is 0.92 .

Embodiment 3

[0033] A field test was carried out in a self-combusting gangue hill in Wuhai. A spontaneous combustion area of ​​2,000 square meters was selected. The internal temperature of the gangue hill was detected to be 423°C by a thermocouple. The thermocouple probe was pre-embedded and the temperature was measured again later in the treatment period. According to the proportion, it was pulverized coal. Ash 50%, desulfurized gypsum 12%, silica fume powder 13%, calcium carbide mud 10%, cement 15%. Chopped glass fiber accounts for 1.5% of the total amount, composite admixture accounts for 5% of the total amount, and the water-cement ratio is 0.67. Prepare a uniform slurry, and use a spraying machine to spray the slurry on the surface of the gangue from top to bottom. The thickness is 12-15cm. After the shotcrete layer is cured, spray water on the surface of the shotcrete cured layer after 72 hours, and last for 3-4 times. The compressive strengths of the 3d, 7d, and 28d sampling tests a...

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Abstract

The invention discloses a novel shotcrete material for suppressing spontaneous combustion of gangue hills and an application method thereof, and belongs to the field of coal gangue spontaneous combustion fire extinguishing; the raw material of the shotcrete material of the present invention is mainly coal-based solid waste, including power plants using coal as fuel The by-product fly ash and desulfurization gypsum, also the by-product calcium carbide mud of PVC plant, the by-product silica fume powder of ferrosilicon smelter, and compound admixture; Use spraying machine to spray the spraying material of the present invention on gangue A solidified layer can be formed on the surface to prevent wind and block leaks, isolate air, prevent air from entering the internal fire source of the gangue dump, and inhibit spontaneous combustion of the gangue dump.

Description

technical field [0001] The invention belongs to the field of spontaneous combustion fire extinguishing materials for coal gangue, in particular to a spraying material prepared from industrial solid waste such as fly ash, which is used for suppressing spontaneous combustion of coal gangue. Background technique [0002] The reason for the spontaneous combustion of coal gangue is that if the heat released during the oxidation of coal and pyrite in gangue cannot be completely dissipated in the surrounding environment, it will cause the gangue to heat up, and the increase in temperature will further accelerate the oxidation exothermic reaction. After reaching the critical temperature point, the oxidation reaction speed will be accelerated sharply. At this time, if sufficient oxygen supply can still be obtained, gangue will quickly enter the state of spontaneous combustion. The existence of a large amount of coal in the gangue maintains the smoldering of the gangue pile for a long...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14A62C3/06A62C99/00A62D1/00
CPCA62C3/06A62C99/0045A62D1/0007C04B28/144C04B2111/00017C04B2111/00155C04B2111/00275C04B2111/00482C04B2111/00577C04B2111/00775C04B2111/00974C04B2201/50C04B18/08C04B18/146C04B18/0418C04B7/00C04B14/42C04B22/00C04B22/062C04B22/147
Inventor 董红娟王博张金山卢悦李庭月史鑫章姚贺瑜
Owner INNER MONGOLIA UNIV OF SCI & TECH
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