High-stability colloidal foam for inhibiting oxidation self-heating of loose coal body and preparation method thereof

Abstract

The invention discloses high-stability colloidal foam for inhibiting oxidation self-heating of a loose coal body and a preparation method of the high-stability colloidal foam. The high-stability colloidal foam is prepared from the following raw materials in percentage by weight: 58-80% of water, 19-40% of fly ash, 0.4-0.8% of an air entraining agent, 0.2-0.6% of a film coating agent and 0.2-0.6% of a cross-linking agent. The preparation method of the high-stability colloidal foam comprises the following steps: firstly, weighing the fly ash and the film coating agent in proportion, adding the fly ash and the film coating agent into water, and fully stirring to obtain a uniform fly ash suspension; adding the air entraining agent into the fly ash suspension in proportion, quickly stirring for 5-10 minutes, and preparing fly ash foam through an air entraining foaming expansion process; and finally, adding the cross-linking agent in proportion, and stirring for 3-5 minutes to obtain the high-stability colloidal foam. The high-stability colloidal foam disclosed by the invention is good in heat-resistant stability and excellent in flame retardant property, can keep moisture for a long time and wet a coal body, has a good wrapping and bonding effect on loose coal bodies such as residual coal in a mine goaf, fire coal in a coal field fire area and the like, and can form a layer of coating film on the surface of the coal body to isolate oxygen for a long time.

Description

technical field [0001] The invention relates to the technical field of coal spontaneous combustion prevention and control, in particular to a high-stability colloidal foam for inhibiting oxidative self-heating of loose coal bodies and a preparation method thereof. Background technique [0002] Coal is the main energy source in my country. The endowment characteristics of energy resources of "rich in coal, poor in oil, and low in gas" determine that the position of coal as the main energy source in my country will not change in the short term. However, at the present stage, the mining of underground coal resources in coal mines is facing a serious threat of coal spontaneous combustion in goafs, mainly because the coal with a tendency to spontaneous combustion is in a broken and piled state. Under the condition of continuous oxygen supply, it undergoes a series of physical and chemical reactions to oxidize and accumulate heat. Spontaneous combustion at the ignition point, and ...

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Problems solved by technology

However, the existing foam materials have poor wrapping and wetting effect on loose coal bodies, short oxygen isolation time, and have very limited oxygen barrier and cooling effects on large-scale loose coal bodies in gobs.

[0004] Fly ash three-phase foam, etc. use foaming agent to modify the surface of fly ash particles, and adsorb on the gas / liquid interface during the foaming process to achieve the effect of stabilizing the foam; but the three-phase foam still has a stable time The problem of short and fast water loss, its half-life is less than 20h, and the remaining solid particles after the foam loses water will dry and pulverize, which cannot completely cover the remaining coal, so it is difficult to achieve the purpose of long-term wetting of the coal body and covering the oxygen barrier

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