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焦炭 COKE

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焦炭是固体燃料的一种。由煤在约1000℃的高温条件下经干馏而获得。主要成分为固定碳，其次为灰分，所含挥发分和硫分均甚少。呈银灰色，具金属光泽。质硬而多孔。
其发热量大多为26380～ 31400kJ/kg(6300～7500kcal/kg)。按用途不同，有冶金焦炭、铸造用焦和化工用焦三大类。按尺寸大小，常规冶金焦，小粒度冶金焦，焦粉等之分。主要用于冶炼钢铁或其他金属，亦可用作制造水煤气、气化和化学工业等的原料。

Coke is a type of solid fuel. It is obtained by dry distillation of coal at a high temperature of about 1000°C. The main component is fixed carbon, followed by ash, which contains very little volatile matter and sulfur. Silvery-grey with a metallic luster. Hard and porous.

Its calorific value is mostly 26380~ 31400kJ/kg (6300~7500kcal/kg). According to different uses, there are three categories: metallurgical coke, foundry coke and chemical coke. According to the size, conventional metallurgical coke, small particle size metallurgical coke, coke powder, etc. It is mainly used for smelting steel or other metals, and can also be used as a raw material for the manufacture of water gas, gasification and chemical industry.