Silica Sand Crushing Plant
Silica sand has been mined for thousands of years as it has many uses, from paving roads to filtering drinking water. It is also used in the hydrofracking process: fluid pressure fractures the rock and opens natural fractures and pores that would normally be closed due to the weight of the overlying rock, the sand grains are then carried into these fractures and prop them open after the fluid pressure is released.
Blasting and the use of crushers are used to loosen weakly cemented sandstone, while keeping the individual, round grains intact When the grains break, it lowers the performance for use as frac sand. After processing, much of the silt and clay is removed and very few grains would have freshly exposed surfaces.
After blasting, the sand is in a mix of rocks and boulders on the floor of the mine. A mobile crushing unit is brought to the mine and is placed close to the blast area in order to minimize the distance the shot rock needs to be hauled to be loaded into the crusher.
Crushing plants are generally consisting of a primary crushing unit and a secondary crusher with a screen plant. The materials from the blast area will be first carried to the primary jaw crusher for initial crushing. The primary crushed silica material is conveyed to the secondary impact crusher where it is further broken down. The resulting material is fed to a screen plant where it is sorted by size.
Smaller particles of a targeted size are carried away to stockpiles. Larger particles are returned secondary crusher and screens until they have reached the desired size.