A method of tailings carbonization cemented filling
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: 2022-04-01
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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[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 sand carbonization cementation filling method, which belongs to the technical field of tailing sand filling. In this method, the solid waste with high calcium and magnesium content and low hydration activity is crushed and ground as a cementitious material, and fully mixed in proportion to make filling slurry; secondly, the filling slurry is pumped to the filling mine through the delivery pipeline Goaf, after the goaf is full, close and block the filling area; CO 2 Inject into the closed filling area, and carry out carbonization curing on the filling body. Finally, during the carbonization maintenance process, real-time monitoring is performed on the solid, liquid, and gas states of the roof, floor, surrounding rock, and filling body in the filling area to ensure that the surrounding rock is stable and the filling effect is up to standard. The invention utilizes solid wastes with high calcium and magnesium content, low hydration activity and difficult resource utilization as cementitious materials, which greatly reduces the raw material cost of tailings cemented mining. The invention has a simple process, and is a low-cost, simple process, clean and environment-friendly tailings carbonization and cementation filling method.
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. ...
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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