What is the significance of coal coking in coal chemical industry?

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1. Coal coking, also known as high-temperature coal retorting, takes coal as raw material, heats it to about 950°C under the condition of isolating air, produces coke by high-temperature retorting, and simultaneously obtains coal gas, coal tar and recovers other chemical products. craft. In order to ensure the coke quality, the most basic requirements for the selection of coking coal are volatile matter, cohesiveness and coking properties; most of the coking coal must be washed to ensure the lowest possible ash, sulfur and phosphorus content.
2. When choosing coking coal, we must also pay attention to the expansion pressure of coal in the coking process. Coking with low-volatile coal, due to its high viscosity of colloid, is prone to generate high expansion pressure, which will cause damage to the coke oven masonry, which needs to be solved by blending coal for coking. Products and uses: Coking products include coke, coal tar gas and chemical products.
3. Coke. The most important product of coking, more than 90% of coke in most countries is used in blast furnace ironmaking, followed by foundry and non-ferrous metal smelting industry, and a small amount is used to produce calcium carbide, carbon disulfide, elemental phosphorus, etc. coal tar. An important product of the coking industry, its output accounts for about 3% to 4% of the coal charged, and its composition is extremely complex. In most cases, the coal tar industry is specially separated and purified for use.
4. Gas and chemical products. The recovery rate of ammonia accounts for about 0.2%~0.4% of the coal charged, and it is often used as the final product in the form of ammonium sulfate, ammonium phosphate or concentrated ammonia. The recovery rate of crude benzene accounts for about 1% of the coal. Among them, benzene, toluene and xylene are the raw materials of organic synthesis industry. The recovery of sulfur and thiocyanate compounds is not only for economic benefits, but also for the needs of environmental protection.