Coal mine microbial cemented filling material and preparation method thereof

Abstract

The invention discloses a coal mine microbial cemented filling material and a preparation method thereof. The material is prepared from raw materials of aggregate and a microorganism, wherein the microorganism is a urease-producing microorganism. Urea hydrolysis reaction of the urease-producing microorganism is adopted to induce calcium carbonate deposition to form gel, the gel completely replacesa cement base in a traditional cemented filling material to serve as a cementing material for coal mine cemented filling, and a microbial liquid solution and a urea and calcium source solution are adopted to blend the aggregate to a required concentration and prepare the coal mine microbial cemented filling material. The applied microorganism in the coal mine microbial cemented filling material replaces a cement-based cementing material, reduces the negative impact on the environment caused by the use of a large amount of cement, reduces the cost of the cemented filling material, and ensuresthat the performance of a filling body meets the technical requirements of coal mine cut and fill mining. The coal mine microbial cemented filling material is a novel cemented filling material with environmental friendliness, low energy consumption and low emission, and has wide applicable fields and promotion value.

Description

technical field

[0001] The invention relates to a microbial cemented filling material for coal mines and a preparation method thereof, which belongs to the technical field of mine filling materials and microorganisms, and is especially suitable for environment-friendly coal mine filling and mining. Background technique

[0002] Underground coal mining will lead to a series of serious problems such as overburden fracture, surface subsidence, groundwater system damage, and environmental pollution. The scientific mining of coal is facing great challenges. As a green mining technology, filling mining is one of the important technical means of scientific coal mining. Cemented filling is an important branch of coal mine filling mining technology. This technology fills the cementing material into the goaf to support the surrounding rock, reduces the disturbance of mining to the overlying rock, improves the resource recovery rate, and reduces the discharge of waste on the surface, r...

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