炼焦的英文：
coking

Because of the low thermal conductivity of coal and the slow rate of distillation, coking is a slow process.
因为煤的导热性低、蒸馏的速度慢，所以炼焦的过程较慢。

Sounds like you did coke.
好象你吃了可卡因了。

Coke consists mainly of carbon.
焦炭的主要成分是碳。

Coke is a smokeless fuel.
焦炭是一种无烟的燃料。

The main drawback to coke-oven is that the amount available depends on the production of coke.
焦炉气的主要缺点是气的供应量取决于焦炭生产情况。

How much coke did you do?
你吸了多少可卡因？