Coal washing is a relatively complex process, the following were some introduction. Coal washing is a kind of coal product that uses coal and impurities (meteorites) to separate coal and impurities by physical, chemical or microbial sorting methods and process them into coal products of uniform quality and different uses. Processing Technology. According to different coal preparation methods, it can be divided into physical coal preparation, physical and chemical coal preparation, chemical coal preparation and microbial coal preparation. Physical coal preparation is sorted according to the difference in physical properties of coal and impurities (such as particle size, density, hardness, magnetic properties, electrical properties, etc.). The main physical sorting method is 1 gravity coal preparation, including jigging coal preparation and heavy weight. Medium coal preparation, chute coal preparation, shaker coal preparation, wind power coal preparation, etc. 2 Electromagnetic selection, using the difference in electromagnetic properties of coal and impurities for sorting, this method has no application in the actual production of coal preparation. Physical chemical coal preparation-floating coal preparation (referred to as flotation) is sorted according to the difference of physical and chemical properties of mineral surface. Currently, there are many flotation equipments , including mechanical agitation flotation and no mechanical agitation flotation. Two. Chemical coal preparation is a process in which chemical components are used to enrich useful components in coal to remove impurities and harmful components. Currently, chemical methods are commonly used in the laboratory for desulfurization. According to the types of commonly used chemical agents and reaction principles, it can be divided into alkali treatment, oxidation method and solvent extraction. Microbial coal preparation is the use of certain autotrophic and heterotrophic microorganisms to directly or indirectly use its metabolites to leach sulfur from coal to achieve the purpose of desulfurization. PREPARATION PREPARATION physical and physico-chemical techniques commonly used in the actual production of coal preparation technique is generally effective in the removal of inorganic sulfur coal (pyrite sulfur), an organic chemical coal preparation and coal may also remove microbial PREPARATION sulfur. At present, the coal preparation methods commonly used in industrial production are coal preparation methods such as jigging, heavy medium, and flotation. In addition, dry coal preparation has also developed rapidly in recent years. In general, 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 domestic sorting processes include jigging-flotation combined process; heavy medium-flotation combined process; jigging-heavy-flotation combined process; lump coal heavy medium-total coal The heavy medium cyclone separation process; in addition to the single jigging and single weight process. (3) Dehydration of products: including dehydration of lump coal and end coal, dehydration of flotation clean coal, dewatering of coal slime. (4) Drying of the product: The coal is dried by thermal energy, and is generally used in relatively cold regions. (5) Treatment of slime water. Coal preparation principle process The role of coal washing: (1) Improve coal quality and reduce emissions of coal-fired pollutants Coal washing can remove 50%-80% of ash and 30%-40% of total sulfur (or 60%~80% of inorganic sulfur) in coal. Burning coal can effectively reduce soot, SO2 and NOx. Emissions, washing 100 million tons of thermal coal can generally reduce 600,000 to 700,000 tSO2, remove 16Mt of meteorites. (2) Improve coal utilization efficiency and save energy The improvement of coal quality will significantly improve coal utilization efficiency. Some studies have shown that the ash content of coking coal is reduced by 1%, the coke consumption of ironmaking is reduced by 2.66%, the utilization factor of ironmaking blast furnace can be increased by 3.99%, and the production of synthetic ammonia by using anthracite can be reduced by 20%; coal ash for power generation. For every 1% increase, the calorific value is reduced by 200-360J/g, and the standard coal consumption per kWh is increased by 2~5g; for industrial boilers and kiln burning washing coal, the thermal efficiency can be increased by 3%~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, low quality to multiple varieties and high quality, and achieve high quality 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 sulfur content is less than 0.5% and ash content is less than 10%. If the coal is not developed, it will not meet the market requirements. (4) Reduce capacity waste Because China's coal-producing areas are far away from economically developed areas with more coal, the coal has a large volume of transportation and a long transportation distance. The average coal transportation distance is about 600 kilometers. After washing, the coal can remove a lot of impurities and wash 100Mt of raw coal. , can save 9600Mt.km capacity. Of course, with the advancement of technology and the development of the times, some special washing processes that are under research or have already been put into production will be further developed and replaced with traditional processes. Drilling Rig Accessories,Elevator Link,Water Injection Pump,Oilfield Drilling Elevator Link Sinotai Petroleum Equipment Co.,Ltd , https://www.sinotaigroup.com