Electric furnace smelting and oxygen heating are generally used in industry. Electric furnace smelting is to melt coke and calcium oxide (molecular CaO) in an electric furnace at about 2200 C to form calcium carbide (molecular CaC2). Oxygen thermal method: both: oxygen-enriched blast furnace oxygen thermal method to smelt CaC2 (calcium carbide), limestone to extract carbon, high temperature and low pressure gas generator. This one furnace three use technology, CaC2 production comprehensive utilization of waste heat and coal ash in the process of coal gasification, coal ash additives melting to produce CaC2 and ferrosilicon (purification of CaC2); "high temperature and low pressure" gas producer, so that the production of gas (gas) naturalization. Each ton of 80% CaC2 is smelted, and about 168kg of pure carbon is extracted from limestone, producing gas (CO 55%-95%) of 6000-2600 m3, producing about 4.5 tons of methanol. Oxygen enrichment not only raises the furnace temperature but also improves the CO quality of the gas. Oxygen can be used in one fell swoop and coal heat energy can be used in coal chemical industry or clean power generation. This process is CaC2 production and gas production without energy consumption and pollution-free.
Calcium carbide is one of the basic raw materials of organic synthesis chemical industry. It is an important raw material for acetylene chemical industry. Acetylene prepared from calcium carbide is widely used in metal welding and cutting.
The production methods are aerobic heating and electrothermal methods. Generally speaking, calcium carbide is produced by electrothermal method, i.e. quicklime and carbon-containing raw materials (coke, anthracite or petroleum coke) in calcium carbide furnace, depending on arc high temperature melting reaction to form calcium carbide. The production process is shown in the diagram. The main production process is: raw material processing; ingredients; through the upper end of the furnace entrance or pipe will be mixed into the furnace, in an open or closed furnace heated to about 2000 degrees Celsius, according to the following reaction calcium carbide: CaO + 3C CaC2 + CO. The fused calcium carbide is removed from the bottom of the furnace and then packaged as finished product after being cooled and broken. Carbon monoxide produced in the reaction is discharged in different ways according to the type of calcium carbide furnace: in the open furnace, carbon monoxide is burned on the material surface, and the flame is dispersed outward along with dust; in the semi-closed furnace, a part of carbon monoxide is placed in the suction hood on the furnace, and the rest is still burning on the material surface; In closed furnaces, all carbon monoxide is extracted.
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