Zinc sulfate, chemical formula ZnS04, colorless rhombic substance, relative density 3.54. Heating to 770℃ decomposes into zinc oxide. The hydrate contains zinc sulfate monohydrate ZnS04:H20, a white powdery knot Crystal, the relative density is 3.31, heated to 280℃ water loss becomes anhydrous substance; Zinc sulfate ZnS04.6H20 hexahydrate, colorless monoclinic or tetragonal crystal, relative density of 2.07, lost when heated to 70℃ Remove 5 crystalline waters to become zinc sulfate monohydrate; Zinc sulfate ZnS04:7H20 heptahydrate, colloquial name opalum, zinc alum, is the most common one, colorless rhomboid crystal or white crystal powder, gradually weathering in dry air, the relative density is 1.96, 39℃ at the loss of 1 crystal water to become zinc sulfate hexahydrate. Zinc sulfate is easily soluble in water, aqueous solution is weakly acidic, soluble in glycerol, slightly soluble in ethanol, and potassium sulfate to form ZnSO4:K2SO4·6H20 type of double salt. Zinc sulfate heptahydrate can be obtained by dissolving gold zinc or zinc oxide in dilute sulfuric acid, concentrating and crystallizing at 30℃, and then rising to high temperature Degree, can obtain other kinds of zinc sulfate.