... medium: the concentration of 80% sulfuric acid, 50% nitric acid, various concentrations of hydrochloric acid, liquid caustic soda, also applies ... industry and other enterprises: a variety of sulfuric acid, hydrochloric acid, alkaline, clear liquid or slurry oil positions. ... 6) iron and steel enterprise: pickling system, sulfuric acid, hydrochloric acid positions, with impurities of the sewage.7) wet ...