Preparation method
After the reaction is complete, the zinc oxide is added to dilute sulfuric acid solution to make a slurry. After filtration, the copper, cadmium and nickel are replaced by zinc powder. After filtration, the filtrate is heated, and potassium permanganate is added to oxidize the impurities such as iron and manganese. After filtration, it is clarified, concentrated, cooled and crystallized, centrifuged and dried. It can also be prepared by leaching calcined zinc ore powder with sulfuric acid.
Anhydrous zinc sulfate can be produced by heating ZnSO4·H2O monohydrate to about 280℃ to completely dehydrate it. Zinc sulfate ZnSO4·7H2O heptahydrate can also be used as the starting material, and it is slowly heated at a lower temperature to gradually dehydrate into monohydrate, and then the temperature is raised to about 280℃. [8]
Application field
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industry
It is the main raw material for the manufacture of zinc barium white and zinc salt, and can also be used as a dyeing mordant, a preservative for wood and leather, and an important auxiliary raw material for the production of viscose fiber and vinylon fiber. [3] In addition, it is also used in the electroplating and electrolysis industries, and can also be used in the manufacture of cables.
Cooling water is the largest amount of water used in industry. The cooling water in the closed cycle cooling system can not corrode and scale the metal, so it must be treated, this process is called water quality stability, and zinc sulfate is used as a water quality stabilizer here. [3]
medicine
Oral zinc sulfate can correct zinc deficiency and restore the function of the enzyme system. Zinc ion can precipitate protein, external use has astringent preservative effect, and can help the formation of granulation tissue. [4] Medicinal zinc sulfate is suitable for the treatment of intestinal disease acrodermatitis, aphthous sores, chronic ulcers, conjunctivitis and so on caused by zinc deficiency. However, sharing with penicillamine can weaken the latter effect. Zinc sulfate monohydrate can be used as zinc supplement in feed. [5]
agriculture
Can be used to prevent the disease of fruit tree nursery, is also a common fertilizer to supplement crops zinc trace element fertilizer, can be used as base fertilizer, leaf fertilizer and so on. [5] Zinc is one of the necessary nutrients for plants, and corn is prone to white flower seedlings due to zinc deficiency. When zinc deficiency is severe, the growth will stop or even the seedlings will die. Especially for some sandy loam soil or fields with high pH value, zinc sulfate and other zinc fertilizers should be applied. Fertilization method: Take 0.04~0.06 kg of zinc fertilizer, 1 kg of water, mix 10 kg of seed, pile up 2~3 hours to sow. Apply zinc fertilizer to the rhizosphere layer before sowing, 0.75~1 kg per mu. If the leaf color is light at the seedling stage, zinc fertilizer can be sprayed with 0.1 kg per mu.