What are the main raw materials used in coal washing plants?

1) Improve the quality of coal and reduce the emission of pollutants from coal combustion.

Coal washing can remove 50% 80 ash and 30% 40 total sulfur (or 60% 80% inorganic sulfur) in coal, and burning washed coal can effectively reduce soot, SO2 and NOx emissions, and washing 100 million tons of thermal coal can generally reduce emissions by 60 700,000 tSO2 and remove 16Mt of gangue.

2) Improve the efficiency of coal utilization and save energy.

The improvement of coal quality will significantly improve the efficiency of coal utilization. Some studies have shown that the ash content of coking coal is reduced by 1%, the coke consumption of ironmaking is reduced, and the utilization coefficient of ironmaking blast furnace can be improved. The use of washed anthracite in the production of synthetic ammonia can save 20% of coal; For every 1% increase in coal ash content for power generation, the calorific value decreases by 200 360 J g, and the standard coal consumption per kilowatt-hour increases by 2 5 g; The thermal efficiency of washing and preparing coal for industrial boilers and kilns can be increased by 3% and 8%;

3) Optimize product structure and improve product competitiveness.

The development of coal washing is conducive to the transformation of coal products from single structure and low quality to multi-variety and high quality, and realize the high quality of products. There are many users of coal consumption in China, and the requirements for coal quality and variety are constantly improving. In some cities, coal is required to have less sulfur content and less than 10% ash content, and it will not be able to meet market requirements without developing coal preparation.

4) Reduce capacity waste.

Due to China's coal-producing areas are far away from the economically developed areas with more coal, the transportation volume of coal is large, the transportation distance is long, the average coal transportation distance is about 600 kilometers, the coal can be washed and selected, a large number of impurities can be removed, and each washing 100MT raw coal can save transportation capacity.

Uses] Coking, heating, power.

Washed coal] Washed refined coal.

Clenedcoal refers to high-quality coal that has been mechanically processed by the coal washing plant, which reduces the ash and sulfur content, removes some impurities, and is suitable for some special purposes. Including coking, non-coking washed coal and heating, power washed coal, lump coal, washed coal, washed coal, etc.

Function] 1) Improve the quality of coal and reduce the emission of pollutants from coal combustion.

2) Improve the efficiency of coal utilization and save energy.

3) Optimize product structure and improve product competitiveness.

4) Reduce capacity waste.

The process of coal washing (coal preparation) is different, and the raw materials used (additives, hail and cherry school additives) are also different. (1) Heavy medium coal preparation should use weighting agent (heavy medium powder); (2) Flotation agents (including foaming agents, collectors, inhibitors and regulators) should be used for flotation; (3) Jigging coal preparation and shaker coal preparation only use water, without adding any additives.

Among them, heavy medium coal preparation is the most advanced gravity coal washing method at present, which is the technology of placing raw coal in a heavy medium with a density (specific gravity) higher than water for separation. There are two types of media used in heavy medium coal preparation: heavy liquid and heavy suspension.

Heavy liquids are aqueous solutions of various soluble, high-density salts (e.g., zinc chloride.

solution) or high-density organic liquids (e.g. tribromomethane, carbon tetrachloride.

The resuspension is made up of a high-density mineral fine powder such as magnetite.

Loess pyrite slag, river sand, barite.

Ganue, flotation tailings, etc.), the most commonly used is magnetite. The heavy medium powder you mentioned refers to the above-mentioned materials, and its function is to improve and adjust the density of the coal washing medium. Heavy liquids are high, most of them are toxic and corrosive, and they are not easy to use, so they are rarely used in industry.

Heavy suspensions are cheap, non-corrosive, easy, and have a wide range of densities in the prepared suspension, so they are widely used in industry.

Generally speaking, a coal preparation plant consists of the following main processes:

1) Raw coal preparation: including the acceptance, storage, crushing and screening of raw coal.

2) Sorting of raw coal: At present, the main sorting processes in China include the combined process of jigging and flotation; Combined remediation-flotation process; jigging-reintroduction-flotation combined process; lump coal heavy medium - end coal heavy medium cyclone sorting process; In addition, there are single jigging and single mediator processes.

3) Product dehydration: including the dehydration of lump coal and end coal, flotation refined coal dehydration, and slime dehydration.

4) Product drying: the use of heat energy to dry coal, generally used in relatively cold areas.

5) Treatment of slime water.

Coal Preparation Principles Process.

Clenedcoal refers to high-quality coal that is suitable for some special purposes after being mechanically processed by the coal washing plant, which reduces the ash and sulfur content, removes some impurities, and is suitable for some special purposes.