ZINC SULPHATE HEPTAHYDRATE
Appearance and properties: colorless rhombic crystal, particle or powder, no odor, astringent taste.
| Product name | ZnSO4•H2O | Batch no.: | 20240410 |
| Packing | 25kg/bag | Batch size | kgs (bags) |
| Report date | 10/04/2024 | Mfg.date | 10/04/2024 |
| Exp.date | 09/04/2024 | Standard | GB/T 25865-2010 |
| Item | Measured | Result | |
| Appearance | white powder | white powder | |
| Zn | 34.5 % | 35.62% | |
| As mg/kg | 5 max | 0.51 | |
| Pb mg/kg | 10 | 0.23 | |
| Cd | 10 | 3.35 | |
| Conclusion: GB/T 25865-2010 | |||
Applications of Zinc Sulphate Heptahydrate
The heptahydrate form’s high water solubility facilitates quick dissolution and bioavailability, making it indispensable in multiple fields:
- Agricultural Fertilizers: Corrects zinc deficiencies in crops like corn, rice, and citrus, enhancing chlorophyll synthesis, photosynthesis, and yield by up to 20% in alkaline soils.
- Animal Feed Additives: Supplies essential zinc for livestock and poultry, supporting growth, reproduction, and immunity; typically dosed at 50-100 ppm in premixes.
- Water and Wastewater Treatment: Acts as a coagulant aid and precipitant for heavy metals, improving flocculation and clarity in municipal and industrial systems.
- Pharmaceuticals and Nutraceuticals: Used in oral zinc supplements and topical ointments for wound healing, acne treatment, and immune boosting, with daily intakes of 15-30 mg recommended.
- Industrial Processes: Essential in rayon and viscose production as a precipitating agent, and in leather tanning for pH adjustment and preservation.
- Chemical Synthesis: Serves as a catalyst in organic reactions and a mordant in dyeing textiles for color fastness.
With global production exceeding 500,000 tons annually, zinc sulphate heptahydrate plays a critical role in food security and sustainable agriculture amid rising micronutrient demands.
Why Choose Aozun Chem’s Zinc Sulphate Heptahydrate?
- Superior Solubility: Optimized crystal structure for 100% dissociation in water, ensuring uniform nutrient distribution without clumping.
- Trace Impurity Control: Meets FAO/WHO standards with <0.005% lead, safeguarding feed and fertilizer safety.
- Cost-Effective Supply: Bulk volumes at competitive rates, with scalable packaging for seamless integration into production.
- Global Accessibility: Efficient logistics to Asia, Europe, and North America, starting with MOQs of 1 MT.
- Sustainability Focus: Derived from recycled zinc sources, compliant with REACH and EU Fertilizer Regulation for eco-responsible farming.
Select Aozun Chem’s zinc sulphate heptahydrate to fortify your products and promote healthier ecosystems.
Frequently Asked Questions (FAQs)
What is zinc sulphate heptahydrate, and why is it important for agriculture?
Zinc sulphate heptahydrate (ZnSO₄·7H₂O) is the most common hydrated form of zinc sulfate, providing 21-23% elemental zinc for soil and foliar applications. Its importance in agriculture stems from correcting zinc deficiencies that stunt growth and reduce crop yields, affecting over 50% of global arable soils, particularly in calcareous regions.
How is it produced?
It is manufactured by dissolving zinc oxide or metallic zinc in dilute sulfuric acid, followed by hot filtration, concentration, and cooling to induce crystallization of the heptahydrate form. This process yields high-purity crystals with minimal iron impurities, often exceeding 98% recovery efficiency.
What are the safety considerations for handling zinc sulphate heptahydrate?
Zinc sulphate heptahydrate is mildly toxic and irritating to eyes, skin, and respiratory tract; avoid inhalation of dust and ingestion (LD50 oral ~1,000 mg/kg in rats). Use PPE, ensure ventilation, and store in cool, dry areas away from incompatibles like strong bases. It is non-flammable but can release sulfur oxides if heated excessively.
Is it suitable for organic farming or animal feeds?
Yes, certified organic grades comply with OMRI and EU organic standards as a mineral fertilizer and feed additive, provided cadmium levels are <0.1 mg/kg. It supports certified organic livestock nutrition at controlled doses to prevent over-supplementation.
What is the shelf life and storage recommendation for zinc sulphate heptahydrate?
It remains stable for 2-3 years when stored in sealed, moisture-resistant bags at <30°C to prevent efflorescence or caking. Avoid direct sunlight and high humidity; use silica gel desiccants for long-term storage in tropical climates.
Can zinc sulphate heptahydrate be used in water treatment applications?
Absolutely— at 10-50 ppm, it aids in phosphate removal and metal precipitation, enhancing turbidity reduction by 80% in coagulation processes. It’s preferred for its cost-effectiveness over ferric salts in treating industrial effluents.
How does zinc sulphate heptahydrate compare to zinc oxide in fertilizers?
Zinc sulphate heptahydrate offers superior water solubility (96 g/100 mL vs. 0.0016 g/100 mL for ZnO), enabling immediate foliar uptake, while zinc oxide suits slow-release soil amendments. Sulphate form also provides sulfur nutrition, making it ideal for multi-deficient soils.
For tailored advice or bulk inquiries, our resources cover formulation guides and case studies.
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