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Coal gangue hill fire extinguishment and reburning prevention method using coal-based solid waste

A coal gangue and coal-based technology, applied in fire rescue, medical science, dentistry, etc., can solve problems affecting work, achieve the effects of saving consumption, realizing comprehensive management, and improving soil structure

Pending Publication Date: 2021-06-01
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN108298888A discloses a closed isolation composition and its implementation method applied to the treatment of coal gangue hills. After the spraying of the closed isolation is completed, its solidification time is affected by climate conditions such as temperature and humidity, which affects follow-up work

Method used

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  • Coal gangue hill fire extinguishment and reburning prevention method using coal-based solid waste
  • Coal gangue hill fire extinguishment and reburning prevention method using coal-based solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Comparison of solid waste-based fire extinguishing slurry with loess slurry and lime slurry

[0030] Solid waste-based fire extinguishing slurry: put 280g of fly ash, 80g of lime, 40g of cement, 2.4g of water glass, and 280g of water into a container, stir with a stirrer for 15 minutes, and mix well to obtain the fire extinguishing slurry. Measure its 2h water separation rate 2.47%,

[0031] Loess fire extinguishing slurry: 70g of loess, 30g of cement, and 80g of water, the rate of water separation in 2 hours is 2.7%.

[0032] Lime fire extinguishing slurry: 70g of lime, 30g of cement, and 110g of water. The rate of water precipitation in 2 hours is 1.2%.

[0033] In a cylindrical iron drum with a diameter of 15cm and a height of 30cm, quickly put the coal gangue block layer, the ignited carbon block layer, and the coal gangue block layer from bottom to top, each layer is about 8cm thick, and the coal gangue block and The particle size of the carbon block is...

Embodiment 2

[0034] Embodiment 2 solid waste base gel sealing material

[0035] Mix 70 kg of circulating fluidized bed boiler fly ash, 20 kg of circulating fluidized bed boiler fly ash with a particle size of 5-10 μm, and 10 kg of slag Portland cement marked 32.5, add 22 kg of water and continue stirring evenly to obtain Fly ash based cementitious material. After curing, the 1-day compressive strength was 3.8 MPa, the 3-day compressive strength was 8.5 MPa, and the 7-day compressive strength was 21.6 MPa as measured by a mechanical strength tester.

Embodiment 3

[0036] Embodiment 3 solid waste base gel sealing material

[0037]Mix 80 kg of circulating fluidized bed boiler fly ash, 10 kg of circulating fluidized bed boiler fly ash with a particle size of 5-10 μm, and 10 kg of ordinary Portland cement labeled 32.5, add 25 kg of water and continue stirring evenly to obtain Fly ash based cementitious material. After curing, the 1-day compressive strength was 3.4MPa, the 3-day compressive strength was 8.3MPa, and the 7-day compressive strength was 20.3MPa as measured by a mechanical strength tester.

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Abstract

The invention relates to the technical field of coal gangue hill fire extinguishment, in particular to a coal gangue hill fire extinguishment and reburning prevention method using coal-based solid waste. The method comprises the following steps: injecting solid waste-based fire extinguishment slurry into a spontaneous combustion coal gangue hill by using a grouting pump, filling gaps with the slurry, isolating oxygen and blocking gangue combustion in a deep area; and pouring and paving a solid waste-based gelling sealing material with the thickness of 5-15cm on the surface of the coal gangue hill subjected to fire extinguishing treatment, and after natural curing and curing, and spraying an elastic sealing material in each block gap to form a rigid-flexible combined sealing isolation layer to completely cover the coal gangue hill and isolate an air inlet path, so that air in the gangue is exhausted to prevent reburning. Gangue-mixed loess is adopted, so that the loess consumption is reduced, and the soil structure is improved. The coal gangue is beneficial to plant growth. According to the coal gangue hill fire extinguishment and reburning prevention method using the coal-based solid waste, oxygen can be effectively prevented from entering the coal gangue hill, the effects of filling, leaking stoppage and fire prevention and extinguishing are achieved, pollution of the spontaneous combustion coal gangue hill to the environment is reduced, and comprehensive treatment of the regional solid waste is achieved.

Description

technical field [0001] The invention relates to the technical field of coal gangue hill fire extinguishing, and more specifically, relates to a method for coal-based solid waste to be used for coal gangue hill fire extinguishing and recombustion prevention. Background technique [0002] Coal gangue spontaneously ignites and releases SO 2 、H 2 S, CO, NO X Harmful gases such as rainwater entering the groundwater, seriously endangering the health of surrounding residents, is an ecological and environmental protection problem that needs to be solved urgently. The important task of coal gangue dump management is to extinguish and dispose of coal gangue hills. After the fire is extinguished, the hills still have the risk of recombustion during the storage process, so they are usually covered with loess for about 1m. [0003] Patent CN109328518A discloses a method for ecological restoration of coal gangue hills. The surface of coal gangue hills is covered with loess to isolate t...

Claims

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Application Information

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IPC IPC(8): A62C2/04
CPCA62C2/04
Inventor 宋慧平王瑾程芳琴吴海滨狄子琛赵仲鹤
Owner SHANXI UNIV
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