(1) This mining method is not strict for the ore body, and the general ore body can be used. (From gentle slope to steeply inclined ore body; from Rongrong vein to thick ore body. The ore rock is stable from very stable to very stable, the ore body is from neat to complex; the surface is allowed to collapse to not allow for collapse). (2) The filling body is relatively compact and has strong compressive capacity, which can effectively prevent surrounding rock movement and control mine pressure. (3) The ore recovery rate is high and the depletion rate is low. (4) It can open the self-igniting mine bottom to prevent internal fire. (5) It is possible to effectively use tailings and waste rock to fill the goaf. (2) Main disadvantages: (1) The mining process is complicated; (2) The production capacity and labor productivity are low; (3) High mining cost (cement and steel, etc.) (4) Mining intensity bottom; (5) A large amount of filling water is required, and after the water is removed from the filling body, it is carried with a large amount of sludge and fine sand, leaking into the roadway and water, and increasing drainage facilities and drainage costs. Accelerate the wear of the pump and increase the cleaning effort of the water and ditch. (6) Deteriorating the environmental sanitation of underground tunnels. Due to the existence of these, hydraulic filling applications are still not widely used. But there is development. (3) What remains to be studied: (1) How to improve the strength of the filling body? (For example, whether the vibrator can be used to increase the medium strength. According to the relevant test, if the vibrator is not added, the void ratio of the tailings is 35%, and after the vibrator is added, the air ratio can reach 18-20%). (2) Seeking a more efficient topping process. According to the relevant information, the US patent describes a granular polystyrene material that can expand several times after heating, and fills the material into the empty area. This expanded material has sufficient strength to securely support the large roof of the goaf. Canada uses a pressurized grout filling method. (3) Concrete materials that are cheap and have sufficient sources should continue to be sought. At present, the amount of cement is large, and the source is still difficult. (4) Further simplifying the process of filling the filling process. Jig Bushings,Cnc Brass Machining Parts,Aviation Parts,Cnc Machining Screw With Solt JING SUNG Precision CO., , https://www.zjcncmachining.com
Evaluation of hydraulic filling mining method
(1) Main advantages: