The preparation of zinc sulfate heptahydrate and copper sulfate pentahydrate from calcined zincblende was investigated.

用经高温煅烧后的闪锌矿石与稀应制备七水锌和五水铜。

Corrosively medium for chemical production such as sodium hydrate,caustic soda,sulfuric acid,nitric acid,acetic acid,fatty acid.

工生产品中的腐蚀性物料，如：烧、、稀、碳、醋等。

Which indubitably indicate that the bismuthous sulfide can only dissolve in halogen acid except hydrofluoric acid, the mixed solution of dilute sulfuric acid and alkali halide.

结果表明铋只能溶于氢卤（除氢氟外）、稀与金属卤物的混合液中，不能溶于稀中。