Ferrous Sulphate Solution
FeSO₄
Ferrous sulphate solution is an iron(II) coagulant supplied as a ready-to-dose aqueous solution of 20-30% FeSO₄, used for coagulation, clarification and de-oiling in dissolved-air-flotation (DAF) systems and oil-production water treatment. CHIMI ART manufactures the solution in Egypt and supplies it in drums, IBCs or bulk flexitanks, with a certificate of analysis accompanying every delivery.
Product Overview
Ferrous sulphate solution is an iron(II) coagulant supplied as a ready-to-dose aqueous solution of 20-30% FeSO₄, used for coagulation, clarification and de-oiling in dissolved-air-flotation (DAF) systems and oil-production water treatment. CHIMI ART manufactures the solution in Egypt and supplies it in drums, IBCs or bulk flexitanks, with a certificate of analysis accompanying every delivery.
Technical Specifications
- Chemical Formula
- FeSO₄
- CAS Number
- 7720-78-7
- Appearance
- Greenish-brown liquid
- Concentration
- 20-30% FeSO₄
- Specific Gravity
- 1.20-1.35
- pH Range
- 2.0-4.0 (1% solution)
- Solubility
- Fully miscible with water
- Available Packaging
- 200L drums · 1000L IBC · Bulk flexitank
- Shelf Life
- 12 months
- Storage Conditions
- Polyethylene containers
| Property | Value |
|---|---|
| Chemical Formula | FeSO₄ |
| CAS Number | 7720-78-7 |
| Appearance | Greenish-brown liquid |
| Concentration | 20-30% FeSO₄ |
| Specific Gravity | 1.20-1.35 |
| pH Range | 2.0-4.0 (1% solution) |
| Solubility | Fully miscible with water |
| Available Packaging | 200L drums · 1000L IBC · Bulk flexitank |
| Shelf Life | 12 months |
| Storage Conditions | Polyethylene containers |
Applications
Dosing Guidelines
Typical coagulation doses are in the range of 50-400 mg/L, varying with the turbidity, colour and organic content of the water; plant experience indicates the strongest performance at elevated pH, typically around 8.5-11.0. Determine the site-specific dose by jar testing, checking floc formation, settled turbidity and residual iron. Feed the solution with chemical-resistant metering pumps at a point of good mixing, and re-optimise seasonally as raw-water quality shifts. For DAF duties, confirm dose and flotation performance in a plant trial.
How It Works
Ferrous sulphate dissociates in water to release Fe²⁺ ions, which neutralise the negative surface charges on suspended and colloidal matter so the particles can aggregate into settleable flocs. Reacting with the water's natural alkalinity, the iron forms hydroxide precipitates that enmesh fine solids as they grow. Where dissolved oxygen or an oxidant is present, ferrous iron converts to the ferric form, whose hydroxide flocs are denser and settle faster — one reason coagulation performance with ferrous salts is typically strongest at elevated pH. In DAF de-oiling, the coagulant destabilises emulsified oil droplets so they attach to flocs and rise with the air bubbles for skimming. Jar testing on the actual water establishes the effective dose and coagulation pH.
Usage Tips
Store ferrous sulphate solution in polyethylene containers or lined tanks, closed and protected from direct sunlight; shelf life is 12 months. The solution is acidic and can stain surfaces and equipment, so use chemical-resistant pumps and piping and provide containment around storage and dosing areas. Keep air contact to a minimum, because dissolved oxygen slowly oxidises ferrous iron. Wear gloves, eye protection and protective clothing during handling, and wash away splashes promptly with water.
Certifications & Compliance
Related Products in This Family
Frequently Asked Questions
When should I choose ferrous sulphate solution instead of ferric chloride?
Ferrous sulphate solution is a cost-effective choice for duties that tolerate operation at elevated pH and for de-oiling in DAF and oil-production water systems, while ferric chloride works across a wider pH range with faster floc formation. The practical way to decide is parallel jar testing on your actual water, comparing settled turbidity, floc quality, alkalinity consumption and sludge volume.
At what pH does ferrous sulphate coagulate most effectively?
Performance is typically strongest at elevated pH, around 8.5-11.0, where denser hydroxide flocs form — especially when dissolved oxygen converts ferrous iron to the ferric form. Always verify the optimum window for your own water by jar testing before full-scale dosing.
How does ferrous sulphate solution help in DAF de-oiling?
The coagulant neutralises the charge on emulsified oil droplets so they destabilise and attach to the forming flocs, then rise with the fine air bubbles to the surface of the DAF unit where the oil layer is skimmed off. Dose and injection point are set in a plant trial to secure stable oil separation.
How is ferrous sulphate solution packaged and how long can it be stored?
It is supplied in 200 L drums, 1,000 L IBC totes and bulk flexitanks. Stored in closed polyethylene containers away from direct sunlight, shelf life is 12 months, and a certificate of analysis accompanies every delivery.
What is the advantage of a ready-made solution over dissolving crystals on site?
The ready-made 20-30% FeSO₄ solution can be dosed directly without make-down tanks or dissolving equipment, and its concentration is consistent from delivery to delivery. Ferrous sulfate heptahydrate crystals suit sites that prefer dry storage and a longer shelf life instead.
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