With the construction, highways, railways, bridges, water conservancy and hydropower and other infrastructure industries, the number of projects, sand and gravel aggregates in the market demand is increasing, the natural river sand mining restrictions, people began to look for new alternatives to ore materials processed into different specifications of the size of the sand, gravel, gangue has become a more commonly used mechanism of the production of one of the raw materials for sand, then gangue in the end what is it, what are the Use, with what crushing equipment is better?

Coal gangue is a solid waste discharged in the process of coal mining and coal washing process, is a kind of coal in the process of coal formation and coal beds accompanied by a kind of lower carbon content, harder than the coal black and grey rock. Coal-associated waste rock is a type of mining solid waste, a solid waste discharged during the process of digging, mining and coal washing. It is a kind of mining solid waste, including the mixture of washed gangue from coal washing plants, hand-selected gangue from coal production, coal and rock discharged from semi-coal and rocky roadway excavation, and white gangue outside of the coal system that is piled up together with the coal gangue. It is a mixture of carbonaceous, muddy and sandy shale with low calorific value. Containing 20 per cent to 30 per cent carbon, some containing humic acid. China has accumulated about 1000Mt of coal gangue over the years, and still continue to discharge about 100Mt per year, not only the accumulation of land, but also can spontaneously combust to pollute the air or cause fire. Coal gangue is mainly used for the production of gangue cement, concrete lightweight aggregate, refractory bricks and other building materials, in addition can also be used for the recovery of coal, coal and gangue mixing power generation, the production of crystalline aluminium chloride, water glass and other chemical products and the extraction of precious and rare metals, but also can be used as fertiliser.

Coal gangue main use of the following ways.

① Recovery of coal and pyrite: through a simple process, from the gangue wash out the good coal, through screening from the selection of poor-quality coal, while picking out the pyrite. Or from the selection of coal jig machine - plane shaker process to recover pyrite, washing coal and coal in the mix. Recovery of coal can be used as fuel for power boilers, gangue can be used as building materials, pyrite can be used as chemical raw materials.

② Used for power generation: mainly used to wash the coal and gangue mixing power generation. China has used the boiling furnace combustion of washed coal and gangue mixture (calorific value of about 2,000 kilograms per kilogram) to generate electricity. Slag can produce slag bricks and slag cement.

③ Manufacture of building materials: instead of clay as raw material for making bricks, it can be less digging good land. When burning bricks, the use of gangue itself combustible, can save coal.

That gangue crushing need to use what crushing equipment?

There are a lot of equipment for crushing gangue, according to the function of the equipment is divided into coarse crushing, medium crushing, fine crushing, corresponding to the good performance of each piece of equipment, good performance in the production process, processing gangue is very suitable.

1, coarse crushing equipment

Jaw crusher: primary processing of gangue, large size of the feed opening, deep crushing chamber, able to deal with large pieces of gangue, crushing ratio is large, the discharge is more uniform, the use of wedge device to adjust the size of the discharge size to meet the user's production needs.

2、Middle crushing equipment

Impact crusher: the use of impact crushing gangue, the use of finite element analysis technology, structural design is reasonable, the finished product has a good particle shape, showing cubic, to better meet the demand for materials, high sales in the market.

Cone crusher: a relatively new crushing equipment, set of hydraulic, electrical, mechanical and other technologies in one, a variety of crushing cavity type can be selected, the machine's wear resistance is good, the quality of wearing parts is high, the chances of failure is small, the material is more uniform, with fully automatic control system, touch screen control mode, the operation is simpler.

3、Fine crushing equipment

Impact crusher: it is a kind of high-efficient crushing and sand making equipment, adopting unique vortex chamber air circulation system, which can reduce dust overflow and production noise, and the production process is environmentally friendly and energy-saving, reliable and high-efficiency, and the sand making effect is good.