Zinc sulphate is the inorganic compound with the formula ZnSO4 as well as any of three hydrates. It was historically known as "white vitriol". It is a colorless solid that is a common source of soluble zinc ions. Usage:used for feed additive for various animals. 1.mainly used as the raw material for the production of zinc-barium powder and other zinc salts. 2.is an important supplemental material for viscose fiber and vinylon fiber, as well as printing & dyeing agent, wood and leather agent, bone glue clarifying and protecting agents, medical emetic and fungicide. 3.It is also applied to electric plating, mineral selection, prevention of the diseases of fruit tree saplings and circulating cooling water treatment, etc. 4.In agriculture, it can be used as fertilizer and feed additive, etc