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Usage

Uses

1. Agriculture:
Zinc sulfate monohydrate is used as a special compound fertilizer for improving rapeseed yield. It is also used to supply zinc in animal feeds, fertilizers, and agricultural sprays, which helps in the growth and development of plants and animals.
2. Textile Industry:
In the textile industry, zinc sulfate monohydrate is used as a mordant in calico printing and in the production of rayon, a synthetic fiber made from natural materials like wood pulp.
3. Wood Preservation:
Zinc sulfate monohydrate is utilized in preserving wood by preventing decay and fungal growth, thus extending the life of wooden structures and products.
4. Chemical Analysis:
Zinc sulfate monohydrate serves as a precipitation reagent during the preparation of sample solutions for ultra-high-pressure liquid chromatographic (UHPLC) analysis, which is a technique used to separate, identify, and quantify components in a mixture.
5. Nanotechnology:
It is used in the preparation of ZnO (zinc oxide) nanocrystals through the sol-gel incineration technique, which has applications in various fields, including electronics, optics, and sensors.
6. Electroplating:
Zinc sulfate monohydrate is employed in the electroplating process to coat objects with a thin layer of zinc, providing protection against corrosion and enhancing the appearance of the object.
7. Preparation of Zinc Compounds:
Zinc sulfate monohydrate is also used in the preparation of various zinc compounds, which have a wide range of applications in different industries.
Physical Properties:
Anhydrous zinc sulfate is a colorless rhombohedral crystalline solid with a refractive index of 1.658 and a density of 3.54 g/cm3. It decomposes at 600°C and is soluble in water, methanol, and glycerol.
The heptahydrate form, ZnSO4·7H2O, has a refractive index of 1.457 and a density of 1.957 g/cm3 at 25°C. It melts at 100°C, loses all its water molecules at 280°C, and decomposes above 500°C. It is very soluble in water (96.5 g/100 mL at 20°C) and soluble in glycerol (40 g/100 mL) but insoluble in alcohol.
The hexahydrate form, ZnSO4·6H2O, constitutes colorless monoclinic or tetragonal crystals with a density of 2.072 g/cm3 at 15°C. It loses five water molecules at 70°C and is soluble in water.
Occurrence and Uses:
Zinc sulfate occurs naturally as the mineral zinkosite. The heptahydrate form, ZnSO4·7H2O, is the mineral goslarite. The salt is used as a mordant in calico printing, in making rayon, in preserving wood, in animal feeds, in electroplating, and in preparing many zinc compounds.
Chemical Properties:
Zinc sulfate monohydrate is a white, free-flowing powder that is soluble in water and insoluble in alcohol.

Production

Zinc sulfate is produced as an intermediate in recovering zinc from mineral zinc blende, ZnS (see Zinc, Recovery). The mineral is roasted at about 1,000°C to form zinc oxide and sulfur dioxide which, on prolonged heating in excess air, converts to zinc sulfate: 2ZnS + 3O2 → 2ZnO + 2SO2 2ZnO + 2SO2 + O2 → 2ZnSO4 In the zinc recovery process, roasted products are leached with sulfuric acid, whereupon zinc oxide is converted to sulfate. ZnO + H2SO4 → ZnSO4 + H2O Also, zinc sulfate can be prepared by reacting metallic zinc with dilute sulfuric acid followed by evaporation and crystallization: Zn + H2SO4 → ZnSO4 + H2

Purification Methods

Crystallise it from aqueous EtOH or dilute H2SO4 below 39o when it forms the heptahydrate, and between 39o and 70o it forms the hexahydrate, and above 70o the monohydrate is stable. The anhydrous salt is obtained from the hydrates by heating at 280o or lower temperatures in a current of dry air. It decomposes to ZnO and SO2 at 767o. The solubility of the heptahydrate in H2O is 5.88% at 0o, 61.92% at 30o, 66.61% at 35o and 70.05% at 39o.

InChI:InChI=1/H2O4S.H2O.Zn/c1-5(2,3)4;;/h(H2,1,2,3,4);1H2;/q;;+2/p-2