Zinc sulphate, commonly known as "White Vitriol", is a widely used zinc compound manufactured synthetically for commercial applications. It is available in hydrated forms, with zinc sulphate heptahydrate (ZnSO4·7H2O) and zinc sulphate monohydrate (ZnSO4·H2O) being important commercial forms. Zinc sulphate is used extensively in fertilizers and micronutrient applications, as well as in rayon pulp, paper, paints and varnishes, textile processing, pigments and calico printing.
Research conducted in 1978 by Mr. P.N. Thakar and Mr. N.S. Randhewa of Punjab Agriculture University, Ludhiana, on micronutrients in Indian agriculture established areas of zinc deficiency based on soil tests and crop responses. In Bihar, zinc deficiency was reported to vary from 25% to 75% and even more of the normal value, with good responses to zinc sulphate application particularly in rice, potato and tea and across cereals.
Commercial manufacture can involve treating zinc ash or zinc dross, a waste by-product of galvanizing units, with sulphuric acid, followed by filtration, concentration and crystallization. Zinc sulphate heptahydrate crystals are separated from the mother liquor using a high-speed centrifuge crystallizer and may subsequently be dehydrated to produce zinc sulphate monohydrate. Analytical reagent grade zinc sulphate is preferably produced using zinc metal as the starting raw material.
| Particulars | Value |
|---|---|
| Plant Capacity | 5 Ton/Day |
| Land & Building (2000 sq.mt.) | Rs. 2.54 Cr |
| Plant & Machinery | Rs. 99 Lac |
| Working Capital for 2 Months | Rs. 68 Lac |
| Total Capital Investment | Rs. 4.35 Cr |
| Rate of Return | 23% |
| Break Even Point | 60% |
Zinc sulphate is a widely used zinc compound that is commercially manufactured through chemical processing of suitable zinc-containing raw materials. For technical-grade production, zinc ash or zinc dross can be treated with sulphuric acid, followed by filtration, concentration and crystallization. Zinc sulphate heptahydrate crystals are separated from the mother liquor and may subsequently be dehydrated to produce zinc sulphate monohydrate. The selection of raw material and processing conditions depends on the required grade and intended application.
Zinc sulphate is mainly used as a zinc source in agricultural fertilizers and micronutrient formulations. It is also used in applications involving rayon pulp, paper, paints and varnishes, textile processing, pigments and calico printing. Its agricultural importance is associated with correcting zinc deficiencies in soils and plants. The appropriate grade, composition and application method depend on the crop, soil condition, end-use requirements and applicable product specifications.
Zinc sulphate monohydrate and zinc sulphate heptahydrate differ primarily in their water of crystallization and resulting chemical composition. Monohydrate contains one molecule of water associated with zinc sulphate, while heptahydrate contains seven. The report identifies zinc sulphate heptahydrate and monohydrate as important commercial forms. Manufacturing may involve crystallization of the heptahydrate followed by dehydration when monohydrate is required. Their specifications and applications should be selected according to the intended industrial or agricultural use.
Zinc sulphate is important in agriculture because it supplies zinc, an essential micronutrient required for normal plant growth and development. Zinc deficiency can reduce crop performance and may require corrective application through suitable fertilizer practices. The report notes that zinc deficiency studies in India established areas of deficiency based on soil testing and crop responses, and that zinc sulphate produced beneficial responses in several crops. Application rates and methods should be determined according to soil and crop requirements and relevant agricultural recommendations.
Common raw materials identified in the report include zinc ash, zinc dross and sulphuric acid, while zinc metal is preferred for analytical reagent grade zinc sulphate. Zinc ash or dross can originate as waste by-products from galvanizing operations and contain zinc along with other metallic impurities. The selected raw material affects the purification requirements and final product quality. Manufacturing facilities generally need suitable systems for reaction, filtration, concentration, crystallization, separation and drying or dehydration.
Typical equipment for zinc sulphate production includes reactors, filter presses, storage tanks, pulverizers and drying equipment, depending on the selected manufacturing route and product grade. The report specifically identifies spray dryers, reactors, filter presses, storage tanks and pulverizers under plant and machinery. A commercial plant may also require crystallization, separation and material-handling systems. Equipment selection should consider raw material characteristics, production process, required product specification, operating conditions, environmental controls and quality requirements.
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