Zibo Dingqi Chemicals Co., Ltd. is one of the most experienced manufacturers and suppliers of ferrous sulfate heptahydrate powder in China. Welcome to wholesale high quality ferrous sulfate heptahydrate powder made in China here from our factory. For price consultation, contact us.
Product Overview
Ferrous sulfate heptahydrate powder is an inorganic iron salt containing seven molecules of crystallization water. It functions as a reactive iron source, precipitating agent, and chemical reductant across industrial manufacturing, municipal water treatment, and environmental processing sectors.
Evaluating the correct hydrate form ensures predictable chemical mass balance, accurate dissolution rates, and consistent reaction kinetics in industrial systems.
Technical Specifications
|
Parameter |
Specification Metric / Standard |
Test Method |
|
Product Name |
Ferrous Sulfate Heptahydrate Powder |
Visual & Chemical Identification |
|
CAS Number |
7782-63-0 |
Industry Standard |
|
Chemical Formula |
FeSO4 * 7H2O |
Stoichiometric Calculation |
|
Active Content (FeSO4 * 7H2O) |
>= 98.0% - 99.5% |
Titration Method |
|
Iron (Fe) Content |
>= 19.5% - 20.1% |
Atomic Absorption Spectrometry |
|
Insoluble Matter |
<= 0.1% - 0.5% |
Gravimetric Analysis |
|
Free Acid (H2SO4) |
<= 0.05% - 0.2% |
Volumetric Titration |
|
PH (5% aqueous solution at 25 C) |
3.0 to 4.0 |
Glass Electrode Method |
|
Heavy Metals (as Pb) |
<= 10 ppm - 50 ppm |
ICP-OES |
|
Physical Form |
Fine Crystalline Powder |
Sieve Analysis |
Water Treatment Applications
Ferrous sulfate heptahydrate powder is utilized in municipal and industrial water treatment facilities where iron-based chemical reactions are specified for contaminant removal and clarification.
Phosphorus Removal
Reaction Mechanism: Ferrous ions (Fe2+) react with soluble orthophosphate under controlled oxidation and pH conditions to form insoluble iron phosphate precipitates.
Process Variables: Treatment efficiency depends on initial phosphate concentration, raw water pH, iron-to-phosphorus molar ratio, dissolved oxygen levels, and downstream solid-liquid separation efficiency.
Application Note: Jar testing is recommended to establish optimal dosing points and polymer coagulant compatibility prior to full-scale implementation.
Chemical Reduction in Industrial Wastewater
Chromium Reduction: Applied in electroplating and metal-finishing wastewater treatment to reduce toxic hexavalent chromium (Cr6+) to less toxic trivalent chromium (Cr3+) prior to alkaline precipitation.
Oxidizer Neutralization: Acts as a reducing agent for hydrogen peroxide, chlorine, and other oxidative species in industrial effluent streams.
Coagulation and Clarification Assistance
Integrated into primary or secondary clarification stages as a coagulant aid to destabilize colloidal suspensions, enhance floc density, and improve settling velocities in high-turbidity wastewater streams.
Industrial Chemical and Manufacturing Applications
Beyond water treatment, ferrous sulfate heptahydrate powder serves as a primary chemical raw material and intermediate across diverse industrial sectors:
Iron Pigment Production: Used as a foundational precursor in the synthesis of synthetic iron oxide pigments (red, yellow, and black iron oxides) for paints, coatings, and construction materials.
Catalyst and Reagent Manufacturing: Utilized in the production of other iron salts, catalysts for organic synthesis, and specialized chemical formulations.
Agricultural Formulations: Deployed as an essential raw material for formulating secondary nutrient fertilizers and animal feed supplements, subject to local regulatory compliance and purity limits.
Manufacturing Process and Quality Control
Consistent product quality is maintained through strict operational control across raw material sourcing, crystallization, and finishing stages.
Crystallization Control: Crystal growth parameters are regulated to maintain uniform particle size distribution, minimize mother liquor entrapment, and control residual moisture levels.
Solid-Liquid Separation: Centrifugal separation isolates crystal fractions while removing soluble impurities and excess sulfuric acid.
Drying and Particle Sizing: Low-temperature drying prevents thermal degradation or premature oxidation of ferrous ions (Fe2+) to ferric ions (Fe3+). Mechanical screening ensures compliance with target particle size specifications.
Batch Testing Protocol: Every production batch undergoes analytical testing for active assay, iron content, insoluble impurities, and pH before packaging and issuance of the Certificate of Analysis (COA).
Packaging, Storage, and Handling
Packaging Options
Woven PP Bags: 25 kg or 50 kg net weight with inner polyethylene liners to prevent moisture ingress.
Jumbo Bags: 1,000 kg or 1,200 kg FIBC bags equipped with discharge spouts and moisture-barrier liners.
Palletization: Available with shrink-wrapping and edge protection for containerized ocean freight or domestic transit.
Storage Guidelines
Store in a cool, dry, well-ventilated, and covered storage facility away from direct sunlight and extreme temperature fluctuations.
Keep containers hermetically sealed to prevent atmospheric oxidation and moisture absorption, which can cause caking.
Isolate from strong oxidizing agents, alkalis, and moisture-sensitive materials.
FAQ
Q: What is the difference between ferrous sulfate heptahydrate powder and granular crystals?
A: The chemical composition is identical, but the physical form differs. Powdered grades offer faster dissolution rates, making them suitable for continuous dosing systems, whereas larger crystals may require dedicated dissolution tanks.
Q: How does exposure to air affect ferrous sulfate heptahydrate powder?
A: Extended exposure to humid air can cause surface oxidation, converting green ferrous (Fe2+) ions into brown ferric (Fe3+) compounds and leading to caking. Maintaining sealed packaging preserves product integrity.
Q: What documents are supplied with each commercial shipment?
A: Each shipment includes a batch-specific Certificate of Analysis (COA), Safety Data Sheet (SDS), Commercial Invoice, Packing List, and Bill of Lading. Additional regulatory or compliance documents can be provided upon request.
Q: What parameters should be defined before requesting a formal quotation?
A: To ensure the correct grade is quoted, provide your target application, required active assay, particle size requirements, packaging preference, destination port, and estimated order quantity.
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