Mine Goaf Treatment

In general, the mining of ore mined, will a certain space of mined-out area. As the underground pressure changes may occur goaf roof subsidence, uplift bottom, side to help prominent rock cracking, spalling or avalanche phenomenon, severe blew rocks occur (rock burst), will spread to the ground surface cracking caused by or collapse. A large area of ​​caving goaf, will result in a strong shock wave and have a huge impact pressure, which affects mine production or even cause a major accident. Then the mine goaf treatment has what it?

Filling method. The method of filling material is outside the mined area to harvest filling. The advantage is to reduce the range of movement goaf roof, to prevent the upper part of the impact generated rock caving, and can take advantage of tailings fill, reducing the volume of surface tailings. The main drawback is the construction of complex, costly and not conducive to the release of pressure deep underground. mobile impact crusher

Caving rock method. The method is returned immediately after mining in the mining column, as far as possible to take down the natural rock. Such as natural rock is not easy to take off, the still need to rock avalanche blasting, filling method compared with the low cost, can be artificially controlled to pressure underground activities. Surface to allow for subsidence or surface subsidence can be controlled conditions. iron ore flotation machines

Isolation method. According to the distribution of the mined areas of different isolation methods handled in two ways:

1, the scattered small isolated mined-out area, the main underground roadway will rock avalanche deposits in the mining and other impacts, measures to isolate the production section of the mined-out area and all hazards that may be passed between the channels, and in mining air near the surface can open a “skylight.” hammer mill for sale south africa

2, on a continuous or almost continuous large deposits in the buffer zone should be set between them, cutting off the main goaf continuous, controlled pressure range. Buffer zone can be a big band-shaped pillar, but also large with stone belt, no belt or man-made high-strength concrete, stone backfill material.