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Zinc
sulfate; White vitriol, also known as alum, jarosite, is colorless or white orthorhombic crystal or powder at room temperature. It has astringency and is easily soluble in water. The aqueous
solution is acidic and slightly soluble in ethanol and glycerol. The pure zinc sulfate does not turn yellow when it is stored in air for a long time, and becomes white powder when it loses water
in dry air. There are many kinds of hydrate: in the range of 0-39 ℃, the stable hydrate in equilibrium with water is zinc sulfate heptahydrate, in the range of 39-60 ℃, it is zinc sulfate 6H2O,
and in the range of 60-100 ℃, it is zinc sulfate monohydrate. When heated to 280 ℃, all the hydrates lose crystal water completely, decompose to zinc oxysulfate at 680 ℃, further decompose above
750 ℃, and finally decompose to zinc oxide and sulfur trioxide at 930 ℃. ZnSO4 · 7H2O and mso4 · 7H2O (M = mg, Fe, Mn, Co, Ni) form mixed crystals in a certain range. It is mainly used as raw
material for making pigment lithopone, lithopone and other zinc compounds. It is also used as nutrient for animals in zinc deficiency, feed additive for animal husbandry, zinc fertilizer for
crops (microelement fertilizer), important material for man-made fiber, electrolyte for electrolytic production of metallic zinc, mordant, medical emetic, astringent, fungicide, etc Wood and
leather preservatives, etc. It is obtained by the reaction of zinc or zinc oxide with sulfuric acid or by the extraction of sphalerite after roasting in reverberatory furnace
