An inerting oxygen-consuming inhibitor for preventing goaf spontaneous combustion and its preparation method

Abstract

The invention discloses an inerting oxygen-consumption stopping agent for preventing a goaf from self-igniting and a preparation method thereof and belongs to the field of self-ignition prevention andtreatment materials in the coal mine goaf. The stopping agent is composed of an iron-containing oxygen-consumption agent, carbonate and thickener, wherein the mass ratio of the iron-containing oxygen-consumption agent to carbonate to thickener is 2:(1-2):(1-4). The preparation method comprises the following steps that 1, according to a matching proportion, the iron-containing oxygen-consumption agent is weighed and activated by using a sulfuric acid solution, the sulfuric acid solution is filtered, and the activated iron-containing oxygen-consumption agent is obtained; 2, according to a matching proportion, carbonate and thickener are added to the activated iron-containing oxygen-consumption agent in sequence and evenly stirred, and the inerting oxygen-consumption stopping agent for preventing the goaf from self-igniting is obtained. The preparation method of the stopping agent is simple, has the quadruple advantages of oxygen consumption, oxygen isolation, goaf inerting and cooling,and can improve the oxygen-consumption performance of a common deoxidation-type stopping agent, release inerting gas CO2, effectively lower the threat of spontaneous ignition of residual coal in the goaf, and provide a guarantee for safe production.

Description

Technical field: [0001] The invention belongs to the field of spontaneous combustion prevention materials for goafs, and in particular relates to an inerting oxygen-consuming inhibitor for preventing spontaneous combustion of goafs and a preparation method thereof. Background technique: [0002] Coal spontaneous combustion is one of the main disasters that threaten the safe production of coal mines. The resulting mine fires and fire accidents have caused huge casualties and property losses. At present, spraying inhibitors in gobs to prevent coal spontaneous combustion is a commonly used fire prevention technology in coal mines. Inhibitors can play the role of oxygen insulation and cooling, and inerting the active groups in coal, but the oxygen concentration around the coal remains There remains a threat to coal spontaneous combustion. [0003] In view of the above reasons, a new type of inhibitor is needed, which can not only have the effect of traditional inhibitors, but a...

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Problems solved by technology

[0004] Aiming at the drawbacks of the existing goaf spontaneous combustion prevention technology, the present invention provides an inerting oxygen-consuming inhibitor and a preparation method thereof for preventing goaf spontaneous combustion, the purpose of which is to accelerate the reducibility by adding carbonate components to the deoxidizer The ionization speed of iron powder and the consumption of reaction products make the equilibrium reaction between reducing iron powder and oxygen more thorough, and overcome the problem that the reaction of iron-based deoxidation inhibitors is not complete and cannot consume oxygen completely and efficiently. The CO produced by the reaction 2 It plays the role of inerting the goaf, while retaining the inhibitor to absorb water and oxygen, inerting the active groups in the coal, reducing the possibility of the remaining coal being oxidized, and playing the role of "resistance to oxygen" and "consumption of coal" for the spontaneous combustion of the underground coal. "Oxygen", "Inerting" and "Cooling" four protection functions, effectively inhibiting the spontaneous combustion of leftover coal in gobs, with a wide range of materials and low cost

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