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Fly ash solidification foamed material for preventing coal spontaneous combustion and preparation method thereof

A technology for solidifying foam and fly ash, which is applied in ceramic products, solid waste management, sustainable waste treatment, etc. It can solve the problems of unrealized solidification and three-phase foam without strength, and achieve adjustable curing time, low cost, The effect of simple operation process

Active Publication Date: 2013-11-13
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the three-phase foam has no strength and has not been solidified; and sometimes a solidified foam material with a high expansion ratio, solidification and a certain strength is required on site to fill, plug leaks and prevent coal spontaneous combustion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: The fly ash solidified foam material includes the following components and parts by weight: 40-60 parts of water, 100 parts of fly ash, 25-40 parts of chemical self-produced gas compound powder, accelerator 3-5 parts, 2-4 parts of active stimulating agent, 1-2 parts of water reducer, 1 part of composite foam stabilizer;

[0017] The chemical self-generating compound powder is composed of calcium sulfate hemihydrate and sodium bicarbonate, and the reaction of the two in water produces carbon dioxide to foam the slurry. The two are prepared in the following proportions by weight: 24-35 parts of calcium sulfate hemihydrate, 1-5 parts of sodium bicarbonate; the quick-setting agent is composed of alumina clinker, sodium carbonate, and quicklime, and the three are as follows: The weight ratio is prepared: 1-2 parts of alumina clinker, 1 part of sodium carbonate, 1-2 parts of quicklime, and the weight percentage of the alumina clinker is 94% of sodium aluminate, ...

Embodiment 2

[0018] Embodiment 2: First, add 50 parts of water, 0.2 part of ethylene glycol butyl ether, 0.3 part of nano-silicon, and 0.5 part of hydroxyhexyl cellulose in the special mixing container A, and the agitator rotates at a speed of 3000 ± 100 rpm , and the stirring time is 2min to form a uniform foam; then, add 100 parts of fly ash, 1 part of alumina clinker, 1 part of sodium carbonate, 1 part of quicklime, 1.2 parts of magnesium oxide, and 1.8 parts of magnesium chloride into dry mixing mixer B , 0.5 part of calcium lignosulfonate, 0.5 part of naphthalenesulfonate formaldehyde condensation product, described naphthalenesulfonate formaldehyde condensation product Na 2 SO4 content < 3%, the weight percentage of the alumina clinker is 94% sodium aluminate, 4% alumina, 2% calcium aluminosilicate, the stirrer rotates at a speed of 3000±100 rpm, and the stirring time is 3min , to form a mixed powder; finally, mix the mixed powder in the dry mixing mixer B into the homogenizing liqui...

Embodiment 3

[0019] Example 3: First, add 60 parts of water, 0.2 part of ethylene glycol butyl ether, 0.3 part of nano-silicon, and 0.5 part of hydroxyhexyl cellulose in the special mixing container A, and the agitator rotates at a speed of 3000 ± 100 rpm , and the stirring time is 2min to form a homogeneous foam solution; then, add 100 parts of fly ash, 2 parts of alumina clinker, 1 part of sodium carbonate, 2 parts of quicklime, 1.6 parts of magnesium oxide, and 2.4 parts of magnesium chloride into the dry mixing mixer B , 1 part of calcium lignosulfonate, 1 part of naphthalene sulfonate formaldehyde condensate, described naphthalene sulfonate formaldehyde condensate Na2SO4 content<3%, described aluminum oxygen clinker weight percent is sodium aluminate 94% , alumina 4%, calcium aluminosilicate 2%, the stirrer rotates at 3000±100 rpm, and the stirring time is 3min to form a mixed powder; finally, mix the mixed powder in the dry blender B into the special In the homogenizing liquid in the...

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Abstract

A fly ash solidification foamed material for preventing coal spontaneous combustion and a preparation method thereof. The fly ash solidification foamed material comprises the following ingredients, by weight: 40-60 parts of water, 100 parts of fly ash, 25 parts of complex powder for chemically self-producing gas, 1-5 parts of an accelerator, 1-4 parts of an activator, 0.6-1.5 parts of a water reducer, and 0.5-1 parts of a foam stabilizer. The preparing method comprises: adding the foam stabilizer in water and stirring to form a uniform foam solution; adding the fly ash, the complex powder for chemically self-producing gas, the accelerator, the activator, and the water reducer in a dry-blending mixer to form a blended powder; and finally adding the blended powder into the uniform foam solution to obtain the fly ash solidification foamed material. The material of the invention is light in weight, safe and low in costs, and has strong crack penetration capability, adjustable solidification time, great compressive strength, low heat conductivity coefficient, and a good heat insulation effect; foam fluid can uniformly cover loose coal-rock mass; carbon dioxide is released during a foaming reaction process to well dilute the oxygen concentration in residual coal space; and the operation technique is simple.

Description

technical field [0001] The invention relates to a solidified foam material and a preparation method, in particular to a fly ash solidified foam material for preventing coal spontaneous combustion and a preparation method. Background technique [0002] Coal spontaneous combustion is one of the main natural disasters in coal mines, which seriously threatens the production of coal mines and the lives of miners. Coalfield fires are mainly caused by coal spontaneous combustion caused by air leakage and oxygen supply from surface fissures. Spontaneous coal combustion in mines mainly occurs in goafs with air leakage passages, open cut-outs, production stop lines, geological structural belts, and high-risk areas of roadways. In order to prevent coal spontaneous combustion, technologies such as grouting, inert gas, inhibitor, gel and polyurethane foam have been adopted at home and abroad. However, these methods have some shortcomings. The yellow mud grouting technique consumes a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02
CPCC04B38/02C04B2111/28Y02W30/91C04B18/06C04B40/0028C04B2103/12C04B2103/302C04B2103/48
Inventor 秦波涛鲁义张雷林贾玉威李磊
Owner CHINA UNIV OF MINING & TECH
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