Zinc sulfate (ZnSO4) is a colorless crystalline, water-soluble chemical compound. The hydrated form, ZnSO4‚7H2O, the mineral goslarite, was historically known as "white vitriol" and can be prepared by reacting zinc with aqueous sulfuric acid. It may also be prepared by adding solid zinc to a copper(II) sulfate solution. It is used to supply zinc in animal feeds, fertilizers, and agricultural sprays. ZnSO4•7H2O is used in making lithophone, in coagulation baths for rayon, in electrolytes for zinc plating, as a mordant in dyeing, as a preservative for skins and leather and in medicine as an astringent and emetic. The second largest use is in agricultural and animal nutrition. To correct zinc deficiency in soil it is applied to the soil alone or in fertilizer or incorporated pesticides sprays. In animal nutrition it is used as a trace element in feeds. Pure zinc sulphate solution is required for many purposes particularly for the preparation of lithopone, phosphorous and for the extraction zinc by electrolytic refining. At present there are the large number of manufacturers engaged in the production of zinc sulphate in the country consider amount of zinc sulphate required for various industrial applications is of high purity and analytical in recent times. The major players in Indian market are D C M Shriram Consolidated Ltd., D D Agro Inds. Ltd., Gujarat State Fertilizers & Chemicals Ltd., Haryana Land Reclamation & Devp. Corpn. Ltd., Hydromet (India) Ltd., Vantech Industry Ltd. With the recent revolution in modern agricultural cultivation the use of technical grade, zinc sulphate is bound to increase tremendously in the near future. So, there will be wide scope for new entrepreneurs to venture into this project.
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