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。