Coal gangue is an abandoned rock discharged during coal mining and processing. When mining coal, the rock layers or bottom plates from the roof of the coal seam, as well as the various types of rock excavated and blasted from around the coal seam during the excavation are all called coal gangue.
Coal gangue utilization is an important part of comprehensive utilization of resources. The utilization of coal gangue can increase the economic benefits of coal enterprises, improve coal mine production structure and environmental quality.
In China, the total installed capacity of generators of low calorific value fuel such as coal gangue reached 28 million kW, and the single unit capacity was from 6 to 300 MW. The annual utilization of coal gangue was 140 million tons, and the annual power generation was 160 billion kWh.
Since the 1970s, the US Bureau of Mines has sampled and analyzed all coal gangue hills and made comprehensive plans for coal gangue utilization. For example, the heat energy is directly recovered from the burning coal gangue mountain for both recovering the heat and controlling pollution.
Because coal gangue brick products have characteristics of lightweight, high strength, good load-bearing seismic performance, excellent thermal insulation, heat insulation and sound insulation, so it is a broad market.
Road construction and backfilling are also important ways for comprehensive utilization of coal gangue. The use of coal gangue as engineering packing materials do not require an increase in cost and need a large amount of use, which brings good economic efficiency to the coal mine.
There are three main types of coal gangue for chemical use: the first is to extract a rare element in coal gangue by various methods, such as Ga, Se, Ti, Co, etc. The second is to recover beneficial mineral products such as kaolin; the third is the production of silicon, aluminum, sulfur and other inorganic chemical products.
The use of coal gangue fertilizer is mainly based on the fact that coal gangue contains rich organic carbon, and the organic matter content in the soil can be greatly increased after being applied to the soil.
The roll crusher is mainly suitable for fine crushing operations with a feed size of less than 150 mm and a finished product size of 100 mesh to 2 mm. What are the advantages of the roll crusher in use?
Compared with the striking type crushing equipment, the biggest disadvantage of the roll crusher is that the "crushing ratio" is relatively small, the particle size of the product changes with the wear of the gap of the roller, and the crushing effect on the sheet-like material is poor.
Therefore, the most important thing about using the roll crusher is the method of stepwise crushing. When crushing coal gangue, it should go through three processes of "coarse-middle-fine crushing".
The surface of the roll crusher is easily worn to grooves and makes the gap between the rolls larger, thereby reducing the crushing effect. When the roller is new, the gap between the two rollers is the smallest, and the fineness of the crushing is the best.
Therefore, to obtain a good coal gangue crushing product, the work we have to do is to minimize the variation value from fine to coarse, and to control the crushing particle size within the allowable range to ensure the quality of the product.
When crushing coal gangue, to achieve the target particle size, three processes of "coarse-middle-fine crushing" are usually carried out. According to the previous configuration experience, we configure a detailed crushing production line for the 10t/h coal gangue:
Raw material warehouseGZD6502300 vibrating feederPE400600 jaw crusher2PG0640 roll crusher3YK1237 vibrating screenDMC64 dust collectorfinished silo (also several B500 conveyors of different lengths).
It can be seen from the above that when there are three specifications of the finished coal gangue, the jaw crusher can be used as the first crush, and the roll crusher is used for the medium and fine crushing.
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