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Coal mine microbial cemented filling material and preparation method thereof

A microbial glue and filling material technology, which is applied in the field of mine filling materials and microorganisms, can solve the problems of increasing the cost of cemented filling materials, consuming large energy, polluting the environment, etc., and achieves the effects of avoiding negative effects, less environmental pollution, and simple preparation process

Active Publication Date: 2018-12-11
CHINA UNIV OF MINING & TECH (BEIJING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the cement used in coal mine cemented filling materials is mainly cement or cement-based materials, and there are three main problems: (1) The cost of cemented filling materials is greatly increased
The grinding process of cement will consume a lot of energy, and the calcination process will emit a lot of greenhouse gases, which has the disadvantages of high energy consumption and environmental pollution.

Method used

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  • Coal mine microbial cemented filling material and preparation method thereof
  • Coal mine microbial cemented filling material and preparation method thereof

Examples

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preparation example Construction

[0032] Such as figure 1 Shown, a kind of preparation method of coal mine microbial cement filling material of the present invention comprises the steps:

[0033] (1) inoculating a single colony of urease-producing microorganisms isolated from the mine environment into a fermentation medium, and fermenting and culturing at 25° C. to 37° C. for 12 to 60 hours to obtain a working bacterial liquid;

[0034] (2) inoculating a single colony of the urease-producing microorganism Sporosarcina pasteurii in the fermentation medium, and fermenting and culturing at 25° C. to 37° C. for 12 to 60 hours to obtain a control bacterial liquid;

[0035] (3) Prepare urea and calcium source solutions with a concentration of 1 to 3 mol / L respectively, the urea solution and the calcium source solution have the same molar concentration, and mix them in equal volumes to make a urea-calcium source mixed solution;

[0036] (4) Select one of fly ash, gangue or aeolian sand as aggregate; or use fly ash a...

Embodiment 1

[0042] In this example, the urease-producing microorganism Bacteria A and the microorganism Sporosarcina pasteurii isolated from the mine environment were used to prepare cemented filling materials for coal mines, calcium chloride dihydrate was used as the calcium source, and aeolian sand was used as the aggregate , including the following steps:

[0043] (1) Inoculate a single colony of the urease-producing microorganism Bacteria A isolated from the mine environment into a fermentation medium, and ferment and cultivate it at 30°C for 24 hours to obtain a working bacterial liquid;

[0044] (2) Inoculate a single colony of the urease-producing microorganism Sporosarcina pasteurii in the fermentation medium, and ferment and culture it at 30° C. for 24 hours to obtain a control bacterial liquid;

[0045] (3) prepare respectively the urea solution that concentration is 2mol / L and the calcium chloride dihydrate solution that concentration is 2mol / L, and mix according to equal volum...

Embodiment 2

[0052] In this example, the urease-producing microorganism Bacteria B and the microorganism Sporosarcina pasteurii isolated from the mine environment are used to prepare cemented filling materials for coal mines. Calcium chloride dihydrate is used as the calcium source, and gangue is used as the coarse aggregate. Fly ash is used as fine aggregate, which specifically includes the following steps:

[0053] (1) Inoculate a single colony of the urease-producing microorganism Bacteria B isolated from the mine environment into the fermentation medium, and ferment and culture it at 30°C for 24 hours to obtain a working bacterial liquid; cultivate Sporosarcina Sporosarcina under the same conditions pasteurii, to obtain the control bacterial solution;

[0054] (2) prepare respectively the urea solution that concentration is 1.5mol / L and the calcium chloride dihydrate solution that concentration is 1.5mol / L, and mix according to equal volume and make urea-calcium chloride mixed solution...

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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...

Claims

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Application Information

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IPC IPC(8): C04B28/00
CPCC04B28/00C04B2111/00663C04B2103/0001C04B24/126C04B22/124C04B14/068C04B18/12C04B18/08
Inventor 邓雪杰程晓辉郭红仙
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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