Petroleum coke is a fuel produced using the byproducts of the petroleum refining process. 石油焦炭是一種燃料，是由石油提煉過(guò)程中的副產(chǎn)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. 將許多金屬硫化物的礦石焙燒是提煉過(guò)程的一個(gè)部分，焙燒過(guò)程產(chǎn)生二氧化硫，還原為硫磺后可用于硫酸工業(yè)。
