Zibo Dingqi Chemicals Co., Ltd. is one of the most experienced manufacturers and suppliers of ferrous sulfate heptahydrate granules in China. Welcome to wholesale high quality ferrous sulfate heptahydrate granules made in China here from our factory. For price consultation, contact us.
Product Overview
Ferrous Sulfate Heptahydrate Granules (FeSO4.7H2O) are an inorganic iron salt supplied in a blue-green crystalline granular solid form designed for industrial chemical synthesis and specialized water treatment processes.
It is critical to distinguish the heptahydrate chemical form (FeSO4.7H2O) from monohydrate or anhydrous alternatives. The seven molecules of crystallization water directly impact the molecular weight, active iron concentration, dissolution rate, physical handling properties, and storage requirements.
Technical Specifications for Evaluation
|
Parameter |
Specification Standard |
Test / Verification Method |
|
Product Name |
Ferrous Sulfate Heptahydrate Granules |
Visual & Chemical Identification |
|
Chemical Formula |
FeSO4.7H2O |
Stoichiometric Calculation |
|
FeSO4.7H2O Content |
>= 98.0% (or customized grade) |
Titrimetric Analysis |
|
Total Iron (Fe) Content |
>= 19.5% |
Atomic Absorption Spectroscopy |
|
Ferrous Iron (Fe2+) |
>= 19.0% |
Potassium Permanganate Titration |
|
Particle Size Distribution |
Custom screened ranges (e.g., 1-3mm) |
Mechanical Sieve Analysis |
|
Insoluble Matter |
<= 0.1% |
Gravimetric Analysis |
|
PH (5% aqueous solution) |
3.0 - 4.5 |
PH Meter |
Key Product Characteristics & Physical Advantages
Controlled Granular Morphology
The product is processed into uniform crystalline granules designed to minimize dusting during handling and transfer compared to traditional fine powders, improving operational safety and facility cleanliness.
Optimized Dissolution Rate
The specific surface area provided by the granular form balances mechanical handling stability with rapid solubility in aqueous solutions, ensuring efficient mixing and preparation in continuous dosing systems.
High Purity Chemical Profile
Manufactured with strict controls on insoluble impurities and heavy metals, providing consistent chemical reactivity required for demanding municipal water treatment and industrial synthesis applications.
Low Residual Moisture Management
Carefully managed crystallization parameters maintain structural integrity during standard storage periods, reducing the risk of premature caking and maintaining free-flowing characteristics.
Industrial Applications & Process Mechanisms
Wastewater Treatment & Phosphorus Removal
Utilized in municipal and industrial wastewater facilities for targeted chemical precipitation and coagulation.
Reaction Mechanism: Soluble ferrous ions (Fe2+) react with orthophosphates to generate insoluble iron phosphate precipitates, achieving efficient chemical phosphorus removal.
Operational Considerations: Performance relies heavily on raw water chemistry, including initial phosphate concentration, operating pH, dissolved oxygen levels, and liquid-solid separation efficiency. Dosing equipment must be compatible with acidic iron solutions.
Industrial Water Treatment & Effluent Conditioning
Applied in industrial effluent processing for specific reduction and precipitation procedures, such as reducing hexavalent chromium (Cr6+) to trivalent chromium (Cr3+) ahead of alkaline precipitation stages.
Chemical Manufacturing & Raw Material Utilization
Serves as an active divalent iron raw material in the synthesis of specialized iron compounds, inorganic pigments, and industrial formulations requiring controlled iron release rates.
Storage Stability & Oxidation Control
Because ferrous sulfate heptahydrate contains seven molecules of crystal water and reactive divalent iron, proper environmental management is essential during storage and handling:
Oxidation Prevention: Exposure to atmospheric oxygen and high humidity can cause surface oxidation, converting Fe2+ into brown ferric (Fe3+) compounds. Containers must remain tightly sealed.
Temperature & Moisture Control: Store in cool, dry, and well-ventilated indoor facilities. Excessive heat can cause crystal water loss (efflorescence), while moisture ingress can cause caking and agglomeration of the granules.
Shelf Life Management: Recommended storage protocols and estimated batch shelf lives are provided in product-specific technical documents based on local climatic packaging formats.
Packaging, Storage Conditions & Logistics
To protect the granular crystalline structure from moisture-induced caking and aerial degradation, standard export packaging options include:
Packaging Formats: Multi-layer woven polypropylene bags featuring inner polyethylene liners.
Transit Protection: Palletized and shrink-wrapped to maintain packaging integrity and moisture protection throughout international maritime or land transport.
FAQ
Q: Are laboratory or pilot testing samples available before placing a commercial bulk order?
A: Sample quantities can be arranged for laboratory testing or pilot-scale evaluation. Buyers typically coordinate courier freight arrangements for sample delivery. Please specify your required grade, particle size, and delivery destination when submitting a sample request.
Q: What are the typical dissolution characteristics and preparation requirements for these granules?
A: Ferrous sulfate heptahydrate granules dissolve readily in water under ambient conditions. However, the actual dissolution rate depends on water temperature, mechanical agitation intensity, and particle size distribution. Utilizing mechanical stirring and adequate mixing time ensures complete dissolution when preparing working dosing solutions for water treatment facilities.
Q: Can particle size distribution or packaging formats be customized for specific industrial processes?
A: Custom particle size screening and specialized packaging configurations, such as tailored net weights or specific inner liner specifications, can be accommodated subject to minimum batch production requirements and order volume. Technical feasibility must be reviewed and confirmed prior to contract finalization.
Q: What is the standard production lead time for international bulk shipments?
A: Standard production, quality verification, and port dispatch lead times typically range from 14 to 25 days following order confirmation, technical sign-off, and payment terms agreement. Exact schedules depend on current order volume, container availability, and destination port logistics.
Q: How is product batch consistency maintained across different shipments?
A: Manufacturing processes adhere to standardized internal quality control protocols. Each production batch undergoes analytical testing for active iron content, pH, and insoluble matter. A corresponding Certificate of Analysis is issued with every shipment to verify compliance with agreed technical specifications.
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