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Tailing carbonization cemented filling method

A technology of cemented filling and tailings, applied in the field of tailings filling, can solve the problems of high cost of cementitious materials, high cost of mineralization storage technology, low utilization rate of high calcium and magnesium solid waste, etc., and achieve low cost and high filling strength Effect

Active Publication Date: 2021-08-06
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for tailings carbonization cementation filling to solve the problem of low utilization rate of high calcium and magnesium solid waste such as steel slag and construction waste, high cost of cementitious filling materials, and CO 2 Technical problems such as high cost of mineralized storage technology

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Embodiment Construction

[0035] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0036] The invention provides a tailing sand carbonization cementation filling method.

[0037] The method includes steps as follows:

[0038] S1: crush and grind the cementitious material, and use whole tailings as the aggregate;

[0039] S2: Fully stir the cementitious material, whole tailings, water and additives in S1 to prepare filling slurry;

[0040] S3: Arrange CO in the goaf 2 gas pipeline;

[0041] S4: Transport the filling slurry prepared in S2 to the filling station, and transport it to the underground goaf by means of pipeline pumping;

[0042] S5: After the goaf is filled, the filling area is closed and blocked to ensure the gas tightness of the filling area;

[0043] S6: After 24 hours of closing the filling area, through the CO arrange...

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Abstract

The invention provides a tailing carbonization cemented filling method, and belongs to the technical field of tailing filling. The method comprises the following steps: firstly, crushing and grinding solid wastes with high calcium and magnesium contents and low hydration activity as a cementing material, and fully mixing in proportion to prepare filling slurry; secondly, pumping filling slurry to a filling goaf through a conveying pipeline, and after the goaf is filled, closing and blocking a filling area; injecting CO2 into a closed filling area, and performing carbonization curing on the filling body; and finally, in the carbonization maintenance process, monitoring the solid, liquid and gas states of the top and bottom plates, the surrounding rock and the filling body in the filling areain real time, the stability of the surrounding rock is ensured, and the filling effect reaches the standard. Solid waste which is high in calcium and magnesium content, low in hydration activity and difficult to recycle is used as a cementing material, and the raw material cost of tailing cemented mining is greatly reduced. The tailing carbonization cemented filling method is simple in process, low in cost, simple in process, clean and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of tailing sand filling, in particular to a tailing sand carbonization and cementation filling method. Background technique [0002] Tailings cemented filling is one of the green mining measures advocated by our country. The cement used in cemented filling at home and abroad is still mainly Portland cement, and its cost accounts for 70% to 80% of the entire filling cost. Although solid waste materials such as water-quenched blast furnace slag (slag) ground powder and fly ash have been used in large quantities to replace some ordinary Portland cement in recent years, the prices of these solid waste materials have doubled in many areas of our country. The problem of high cementing cost has not been solved. The use of traditional cementing agents has brought huge costs to cemented filling mining, resulting in the cemented filling rate of underground mining in my country hovering below 30% for a long time. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B40/02
CPCC04B28/00C04B40/0231C04B2111/00775C04B2201/50C04B18/12C04B2103/10
Inventor 李佳洁靳心王成洲朱斯陶倪文姜福兴
Owner UNIV OF SCI & TECH BEIJING
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