Filling material and its filling method:
(1) Source of filling materials
①Surface deposited waste rock; ② the waste rock excavation pit; ③ beneficiation plant tailings; ④ smelter slag; ⑤ Ge Bi aggregate; ⑥ quarrying metal gate from the surface and the like.
(2) Method for conveying filling materials
It can be transported by mine car or other machinery, or it can be transported by wind or water. At present, hydraulic conveying applications are widely used.The purpose of the filling process:
(1) Conducting ground pressure management
Use the formed filling body to carry out ground pressure management, use to control the surrounding rock caving and surface subsidence, and create convenient conditions and safe conditions for the mining face, protect the surface buildings, ease large-area ground pressure activities, and resume safe production.
(2) Eliminating internal fires
Some mines use this method to prevent spontaneous combustion deposits (inside fires or other disasters).
[Reference] The top plate of direct Xiangtan manganese ore, the ore is blade-shaped black shales, after caving under conditions of air and water, for 30 to 50 days after the spontaneous combustion. After the filling method, the internal fire was eliminated.
(3) Creating conditions for returning to the mining column
Whether the empty field can be filled in time after the mining house is harvested will directly lead to the mining of the pillar, which will directly affect the balance and balanced production of the third-grade mine. The lead-zinc ore of Fankou, mining tailings on both sides are cement, cement backfilling the pillar horizontal layering method. )
(4) Creating conditions for deep and underwater mining.
Used for deep mining, underwater mining and prevention of impact ground pressure.
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