Aqueous film-forming colloidal foam for preventing gas gushing in gobs and preparation method thereof

Abstract

The invention provides aqueous film-forming gel foam for preventing gas emission in goaf. The aqueous film-forming gel foam is prepared from the following raw materials: xanthan gum, guar gum, sodium bicarbonate, tartaric acid and water. The aqueous film-forming gel foam is capable of wrapping residual coal in goaf, and blocking coal and rock fractures so as to control gas emission in goaf and eliminate the phenomenon of transfinite gas in an upper corner even a ventilation roadway caused by gas emission, no toxic or harmful by-product is produced and a good application prospect is realized. The invention further provides a preparation method for the aqueous film-forming gel foam for preventing gas emission in goaf. The preparation method comprises the following steps: (1), preparing raw materials according to a ratio, adding xanthan gum and guar gum in water, and uniformly stirring to enable the materials to be dissolved completely, so as to obtain a thickened solution; (2), sequentially adding sodium bicarbonate and tartaric acid in the thickened solution obtained in the step (1), stirring for 10-15 min, and foaming to form the aqueous film-forming gel foam. The method has the advantages of simple process and low cost.

Description

technical field [0001] The invention belongs to the technical field of coal mine gas control, and in particular relates to an aqueous film-forming colloidal foam for preventing gas gushing in goafs and a preparation method thereof. Background technique [0002] Mine gas is one of the main natural disasters in coal mining. In recent years, with the development of mine centralized production technology, one mine side and one mine two sides have been widely used, and mine production efficiency has been greatly improved. However, due to the increase in the degree of mechanization and mining intensity, the absolute gas emission of the working face has directly increased significantly, the gas emission in the goaf has intensified, and the gas in the upper corner of the working face has frequently exceeded the limit, so that safe production cannot be guaranteed. Increased difficulty also limits the increase in mine output. In order to prevent the gas gushing out of the upper corn...

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Problems solved by technology

These technologies are effective for ensuring the safe production of gas mines or coal mines with small output, but as the mines extend to deeper areas, the gas content of coal seams gradually increases, and the original gas mines are transformed into high-gas mines or outburst mines. Relying on the above methods cannot effectively solve the problem of gas overrun in the upper corner. For example, the air volume introduced by the wind barrier method is small, which is only applicable to the working face where the gas emission concentration in the upper corner does not exceed 3%; add exhaust fans Relevant special equipment needs to be configured, increasing costs, and occupying limited space in the roadway, which affects the operating environment and conditions; the gas extraction rate of buried pipes in the upper corner is low, and the extracted concentration is usually less than 10%; although the gas concentration extracted from high-level drilling is relatively high , but limited by the drilling capacity of the drilling rig, the distance between the drilling sites is not large, the drainage pipelines withdraw frequently, the effective extraction time of the drilling site is short, and the drilling construction quality is difficult to guarantee; increasing the air volume of the working face will also cause goaf Increased air leakage in the area may easily lead to spontaneous combustion of coal in the goaf

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