Cutting wall filling method
The first mining stone, or the first mining rock, should be determined according to the specific circumstances. If the surrounding rock is solider than the ore, the ore is easy to be mined, the ore body has sufficient thickness, the ore is easy to be removed from the state, and the useful components are easy to be shaken. In this case, the surrounding rock can be mined after mining ore, and the surrounding rock is used first. stone. (In short, if the ore surrounding rock is soft, it will collapse in the stratification, otherwise, it will collapse the surrounding rock first). When the ore is first mined, the ore is collapsed on the paved hot layer, and the work is repeated according to this work cycle. If the surrounding rock is first collected, the surrounding rock that has been used for filling should be leveled, the cushion layer laid, and then the ore will be collapsed. (1) Rock drilling work: Using the up-and-down rock drill to make shallow eyes, the distance between the blastholes is generally 0.3 to 0.6 meters, and the depth of the blasthole is generally 1.2 meters. The blastholes are mostly arranged in the middle of the veins. The area occupied by a blasthole is 0.1 to 0.25 m 2 . The mining stratification height is generally 1.0 m. When the thickness of the vein is very small, it is best to use a small diameter blasthole (about 30 mm), which can shorten the distance between the blastholes, which is beneficial to reduce the loss of ore and save labor. (Although the number of blastholes has increased, the rate of rock drilling has increased as the diameter of the blasthole has decreased). (2) Charge blasting work: After the blasthole is finished, the blasting work can be performed. It is usually charged by a manual charging package. Before the collapse of the mine, the cushion should be laid on the filling in the stope. There are many types of cushions. You can use a layer of straw bags, sacks or tarpaulins to lay a layer of wood. In the previous method, the cushion is easily damaged, the number of reuses is small, and it is easy to mine, and it is also not conducive to the ore transportation in the mining, and is not convenient for the electric ore. The selected cushion should be made of materials that can be taken locally, cheap, durable, and reused many times for easy transportation. Plating steel has these advantages. At present, some mines use transport belts as cushion materials. It has been proved by practice that the belts are durable, reusable and easy to use. If the mining of precious metals and high grade, in order to improve the recovery rate, the more effective method is to lay 10 to 15 cm thick layer of filling material in concrete. (3) Ventilation work in the stope: This method uses the total negative pressure of the whole mine. The fresh air is transported from the flat roadway, enters the working surface through the patio of the mining area, cleans the working surface, and enters the ventilation flatway from another patio. (4) Pingchang transportation work The ore that has collapsed can be manually transported or mechanically transported. For example, electric rafts use small mechanical transport to reduce the physical labor of workers. This can also improve the efficiency of stope transportation. (5) Work of caving surrounding rock: After the ore in the mining is completed, the cushion is removed (the concrete floor is de-slanted) and the charge is detonated in the surrounding rock and detonated. The rock that collapsed after the blast is filled into the goaf. If there are too many rocks that have fallen, the excess ore can be released through the waste rock discharge hole built by the high-first layer, and the height of the filling layer can be adjusted. Then fill the work surface for leveling. Once the mat is laid, the next work cycle can be performed. Electric Mountain Bicycle, Electric Bicycle, 26inch Electric Bicycle Ningbo Sunhon International Co., Ltd. , https://www.scooterelectricadult.com