Zinc sulfate heptahydrate (chemical formula: ZnSO₄·7H₂O, CAS No.:7446-20-0) is a crystalline compound with a molecular weight of287.56. It appears as colorless or white hygroscopic crystals or powder, soluble in water and slightly soluble in ethanol.
The substance exhibits a density of approximately1.957 g/cm³and melts at100°C, gradually losing water of crystallization upon heating. At280°C, it converts to anhydrous zinc sulfate, and decomposes into zinc oxide and sulfur trioxide at767°C.This compound is typically synthesized by reacting zinc oxide or zinc hydroxide with sulfuric acid.
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Zinc sulfate heptahydrate (chemical formula: ZnSO₄·7H₂O, CAS No.:7446-20-0) is a crystalline compound with a molecular weight of287.56. It appears as colorless or white hygroscopic crystals or powder, soluble in water and slightly soluble in ethanol.
The substance exhibits a density of approximately1.957 g/cm³and melts at100°C, gradually losing water of crystallization upon heating. At280°C, it converts to anhydrous zinc sulfate, and decomposes into zinc oxide and sulfur trioxide at767°C.This compound is typically synthesized by reacting zinc oxide or zinc hydroxide with sulfuric acid.
The production process involves pH-controlled reactions, filtration to remove impurities (e.g., copper, cadmium), oxidation of residual contaminants (e.g., iron, manganese), and crystallization.Key applications include:
1. Industrial uses: Raw material for manufacturing zinc salts, electrolyte for zinc electroplating, and component in wood preservatives and paper bleaching agents.
2. Agriculture: Zinc micronutrient fertilizer to address soil deficiencies.
3. Pharmaceuticals: Emetic agent in medical formulations.
4. Textiles: Mordant in dyeing processes and auxiliary in viscose fiber production.
5. Water treatment: Cathodic corrosion inhibitor in cooling systems, often synergized with polyphosphates or organic phosphonates at2–4 mg/L concentrations.Safety considerations classify it under hazard category9.2, with risks including skin/eye irritation (H318) and aquatic toxicity (H410). Handling requires protective measures against inhalation and contact (S22/S26) and adherence to environmental disposal protocols (S61). It is hygroscopic and should be stored in airtight containers at room temperature.
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Standard No. |
HG/T 2326-2015 |
|
Zinc sulfate heptahydrate,% ≥ |
98.0 |
|
PH value（50G/L solution） ≥ |
4.0 |
|
Packing |
25kg/bag,1000kg/big bag |
1. Textile Industry: Serves as a mordant in dyeing processes, particularly for fixing colors in Vat Blue dyeing, and acts as an alkali-resistant agent to enhance dye stability.
2. Paper Manufacturing: Functions as a bleaching agent to remove impurities, improving paper whiteness and quality.
3. Wood Preservation: Extends wood durability by preventing decay through chemical treatment.
4. Synthetic Fiber Production: Used in coagulating baths to facilitate fiber formation and enhance structural integrity in viscose and vinylon fiber manufacturing.
5. Electroplating & Electrolysis: Acts as an electrolyte additive to improve the quality and performance of metal coatings.
6. Agriculture: - Pesticides: Incorporated into formulations to control crop pests and diseases. - Micronutrient Fertilizer: Applied as a foliar spray or soil additive to address zinc deficiency in plants, promoting healthy growth.
7. Animal Feed: Added as a zinc supplement to support animal nutrition and metabolic functions.
8. Food Industry: Approved as a zinc fortifier in food products (e.g., dairy, cereals, beverages) to meet dietary zinc requirements.
9. Pharmaceuticals: Utilized as an emetic agent and astringent in medicinal preparations.
10. Chemical Synthesis: Key raw material for producing zinc compounds (e.g., zinc stearate, basic zinc carbonate) and inorganic pigments like lithopone.
11. Aquaculture: Controls parasitic infections (e.g., ciliates) in aquatic species and improves stress resistance in crustaceans.
12. Leather & Cable Industries: Preserves leather and enhances corrosion resistance in cable coatings.
13. Water Treatment: Regulates water quality in industrial cooling systems.This compound’s versatility spans industrial, agricultural, nutritional, and scientific domains, driven by its solubility and zinc bioavailability.
1. Bottles:500g,1kg, and smaller quantities such as1g,25g,50g,250g, or10g for laboratory or reagent-grade applications
2. Industrial bulk packaging:25kg paperboard drums,1kg containers, or200kg galvanized iron drums for large-scale industrial use.
3. Flexible unit options: Available in various weights (e.g.,25kg,1000g) depending on application requirements, with materials adapted to product properties, typically paperboard or metal drums for stability and moisture protection.
These specifications cater to diverse applications, ranging from chemical research to industrial production.
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