Petroleum coke is a fuel produced using the byproducts of the petroleum refining process. 石油焦炭是一种燃料，是由石油提炼过程中的副产品加工而成的。
Many sulfide-containing metal ores are burned as part of the extraction process, giving off sulphur dioxide, which can be recovered and used in the sulphuric acid industry. 将许多金属硫化物的矿石焙烧是提炼过程的一个部分，焙烧过程产生二氧化硫，还原为硫磺后可用于硫酸工业。
