Gangue separating method and device for mine

Abstract

A pit coal gangue separation method and equipment adopt combination of a screening crusher, a front mounted type belt conveyer, a screening machine and a selective crushing type separating machine, a postposition type belt conveyer and a gangue transporter. The method includes the following steps: grading on the spot for coal and gangue in downhole to make the coal gangue that is smaller than 50 mm fall onto the postposition type belt conveyer for carting; entering the coal and gangue that are larger than 50 mm to the selective crushing type separating machine, breaking down the same after striking by a revolving impeller, the knocked broken coal after screened by a spiral sieve plate falling into the postposition type belt conveyer for carting; throwing out the gangue which is not knocked broken onto a backboard under a force generated while the impeller in screw rotating motion, and falling the gangue onto the gangue transporter for transport. The equipment may be directly used in downhole for the separation of coal and gangue, wherein the gangue can directly fill a gob area without being discharged from mine, thus the equipment can prevent surface subsidence, reduce environmental pollution, and save transport capacity of the gangue both in surface and underground. The invention has advantages of compact equipment, convenience for assembling and disassembling, good separation effect, and extensive practicality.

Description

technical field [0001] The invention relates to a method and equipment for separating coal and gangue in mines, and is especially suitable for direct separation of bulk coal and gangue in mines. Background technique [0002] At present, the separation of coal and gangue is carried out on the ground, and the separation methods include hand separation, water separation, wind separation, and gamma ray separation. Hand selection: It is to pick out large pieces of gangue from the mixed coal on the belt conveyor by hand. Its working conditions are very difficult, the efficiency is low, it is easy to cause wrong selection, missed selection, and great potential safety hazards. Water separation: it uses the different proportions of coal and gangue to separate coal and gangue by the buoyancy of water, and the separation effect is better. However, the equipment is expensive, the process is complex, and the site required is large, so it is difficult to use...

AI Technical Summary

Problems solved by technology

However, its system is complicated, its sorting capacity is small, and there are hidden dangers of radioactive sources. There is often water or slime in the raw coal on site, so that the surface of coal and gangue is covered by slime, resulting in difficulties in identification.

With the increasing mechanization of coal mining, the amount of large gangue mixed into coal is gradually increasing, and it is sorted on the well, causing environmental pollution and occupying farmland.

If it is used for backfilling of goaf, the mixed coal is transported from the underground to the ground, and the sorted gangue is transported back to the underground from the ground, which is a waste of manpower, uneconomical, and causes secondary pollution.

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