Wherever such metals aslead,zinc,copper,cadmium, ornickel(among others) are processed, much of the sulfuric acid needed in the metallurgical operations may be obtained on the site by converting sulfur dioxide, produced by roasting the ores, to sulfur trioxide, SO3, and thence to sulfuric acid...
zinc, tin, and silver ores in Bolivia, Canada, England, and Germany. Its naturally occurring compounds are chiefly the oxide (bismite or bismuth ochre, Bi2O3), the sulfide (bismuthinite or bismuth glance, Bi2S3), and two carbonates (bismutite, (BiO)2CO3, and bismutosphaerite). ...