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377Ferrous Sulfate (FeSO₄·7H₂O) Product Overview: Ferrous sulfate easily oxidizes to yellow or rust color when exposed to humid air. It is soluble in water, and the commonly used concentration for ferrous sulfate solution is around 10%. As a co
Ferrous sulfate easily oxidizes to yellow or rust color when exposed to humid air. It is soluble in water, and the commonly used concentration for ferrous sulfate solution is around 10%. As a coagulant, it forms large flocs, offers good water clarity, settles quickly, and is highly effective in color removal. Ferrous sulfate is a low-cost treatment chemical and is particularly suitable for wastewater with a pH above 8.5.
| Property | Specification |
|---|---|
| Appearance | Pale green crystals, relatively dry, non-dripping |
| Ferrous Sulfate (FeSO₄·7H₂O) | ≥ 90.0% |
| Iron (Fe) Content | ≥ 18% |
| Lead (Pb) Content | ≤ 0.002% |
| Arsenic (As) Content | ≤ 0.0002% |
| Cadmium (Cd) Content | ≤ 0.0005% |
| Packaging | Woven bags, 25kg or 50kg double-layer bags |
Primary Use: Water treatment
Common Names: Ferrous sulfate, green vitriol, heptahydrate ferrous sulfate, dried ferrous sulfate
Uses include:
As a reducing agent in electroplating plants
As a coagulant for industrial wastewater
As a precipitant in dyeing and textile plants
As a raw material for iron oxide pigment (red iron) manufacturing
As a pesticide intermediate
As a raw material for fertilizer production
As a fertilizer additive for ornamental plants and flowers
Ferrous sulfate is widely used for flocculation, clarification, and decolorization of:
Dyeing wastewater
Papermaking wastewater
Domestic sewage
Industrial wastewater
It is especially effective for treating high-alkalinity and high-color wastewater and helps reduce the need for excessive acid neutralization.
Prepare a 5%–10% aqueous solution before adding it to raw water.
Adjust the pH of the raw water to 9–11 using lime for optimal results.
Heptahydrate ferrous sulfate offers benefits such as low cost, excellent decolorization, large floc formation, and fast settling.
Under acidic conditions, reducing agents such as ferrous sulfate, sodium sulfite, sodium bisulfite, or sulfur dioxide can be added to reduce hexavalent chromium (Cr⁶⁺) to trivalent chromium (Cr³⁺). Then, sodium hydroxide, calcium hydroxide, or lime is added to adjust the pH and form chromium hydroxide precipitate, which is separated from the wastewater.
