heptahydrate zinc sulphate
Heptahydrate zinc sulphate at room temperature as white granules or powder, orthorhombic crystal, convergence is a common astringent, dry air weathering. Loss of part of crystal water heated to 3 0 ° C, loss of six molecules of crystal water at 100 ° C, 280 ° C lost seven crystal water molecules at 767 ° C decomposition into zinc oxide and sulfur trioxide. Able to dissolve in water, micro-soluble in in ethanol and glycerin. Need to save closed. Mainly used as raw material for the manufacture of lithopone and other zinc salts, viscose fiber and vinylon fiber, such as secondary raw material, also used for dyeing mordant, wood and leather preservative, glue clarification, and preservative, medicine emetic and fungicides, such as trace element fertilizers used in agriculture.
Preparation of waste batteries
Will take off the battery of the zinc skin washed into a beaker, cut into small pieces, add water, add concentrated sulfuric acid, the appropriate heating. Zinc skin dissolve finished, zinc skin, the general control of the zinc skin a little excessive to operate these. And then zinc sulfate solution was heated evaporation, crystallization of the zinc sulfate at 120 ℃ drying, dry the finished product.
Chemical properties
Colorless orthorhombic crystal prismatic crystal. Soluble in water. Slightly soluble in alcohol and glycerin.
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