Several low cost cemented tailings filling methods

Solid waste cemented filling is a cemented filling method with mine solid waste as filling material and cement or mining solid waste as cementitious material. Metal mine tailings include red mud, phosphorus slag, phosphogypsum, etc. waste rock is the two main solid wastes. Mine solid waste cemented filling mainly refers to the cemented filling method with mine waste rock and tailings as filling materials. This filling method makes full use of mine solid waste, which can greatly reduce the filling cost, improve the filling efficiency, especially reduce the discharge of mine solid waste in a large amount. Therefore, it provides a strong support for the popularization and application of cemented filling mining method to solve the mining technical problems of difficult mining beds.

The cemented filling of waste rock takes the excavation waste rock of the mine as the filling aggregate, and takes cement or solid waste cementitious material as the cementitious material. The filling method of filling into the goaf after gravity mixing. The technical feature is that the waste rock of natural grading in the mine is fully used in the mine. Through the diversion input of waste rock aggregate and gelling agent and gravity mixing process, the mechanical properties of the filling body are taken as the goal to achieve the best water filling and minimize the energy consumption and cement consumption. Because waste rock is used as the main filling aggregate, the cost of filling material is lower than that of fine sand cemented filling material, and the compressive performance of waste rock cemented filling body is better than that of mortar cemented filling body. After the waste rock cemented filler is filled into the stope, there is almost no water seepage, which can avoid the environmental pollution caused by underground.

Tailings cemented filling refers to the cemented filling method using flotation tailings as aggregate, including graded tailings cemented filling and full tailings cemented filling. For cemented filling with graded tailings, a large amount of tail mud needs to be discharged. Full tailings cemented filling refers to the cemented filling method using full grain tailings without grading and desliming as filling aggregate. Due to its great technical difficulty, it began to be mature and applied in mines at home and abroad in the 21st century. For the whole tailings filling aggregate, due to the high shale content, the cement will be lost due to dehydration at low concentration, resulting in high cement consumption, serious deterioration of underground operation environment, and even difficult solidification due to segregation and classification,. Therefore, it is required to carry out full tailings cemented filling in the state of high concentration. In the narrow sense, the full tailings cemented filling method does not add coarse aggregate, mainly gravity transportation, and can be pumped. The filling slurry does not dehydrate after being filled into the stope, with only a small amount of bleeding. The generalized full tailings cemented filling method can coarsen the aggregate. The whole tailings and filler added with coarse aggregate are mainly pumped and can also be transported by gravity under appropriate conditions.