Ferrous Sulfate Heptahydrate
Iron(II) Sulfate Heptahydrate, Green Vitriol, Copperas.
- CAS
- 7782-63-0
- EC
- 231-753-5
- Sectors
- Water & Wastewater Treatment, Agriculture, Building & Construction
Ferrous Sulfate Heptahydrate (CAS 7782-63-0) is an inorganic iron salt that appears as greenish or yellowish fine or lumpy crystals, supplied as a Technical Grade coagulant and iron source for wastewater purification, agricultural micronutrient programs and cement manufacturing. The product acts as a superior flocculant , removing phosphates and reducing hexavalent chromium in heavy industrial effluents. It is valued for its high solubility and effectiveness as a micronutrient in large-scale agriculture. In the construction sector, it is used as a cement additive to neutralize hazardous chromium levels and as a pigment precursor. Its cost-efficiency makes it a staple for environmental remediation and soil conditioning projects.
Typical Properties
| Molecular formula | Fe.H2O4S.7H2O |
|---|---|
| Molecular weight | 278.01 g/mol |
| Appearance | Ferrous sulfate is a greenish or yellowish solid in fine or lumpy crystals. |
| Form | Solution |
| Color | Slightly greenish to blue |
| Odor | pale bluish-grn. cryst. or gran., odorless |
| Melting point | 64 °C |
| Density | 1.897 g/cm³ |
| Water solubility | 25.6 g/100 mL (20 °C) |
| pH | 3.0-4.0 (25°C, 50mg/mL in H2O) |
| GHS signal word | Warning · Irritant / harmful |
| HS code | 28332950 |
| Grades available | Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Ferrous Sulfate Heptahydrate
Applications
- Wastewater Treatment: Functions as a primary coagulant to clarify water and treat hazardous industrial effluents.
- Agriculture: Applied as an iron fertilizer (Green Vitriol) to treat iron chlorosis and improve crop yield in alkaline soils.
- Construction: Used in cement manufacturing to reduce toxic Cr(VI) and as a colorant for concrete and bricks.
Safety & Risks
Classified as Acute Toxic (H302) and a Skin Irritant. Always use Nitrile Gloves, Protective Eyewear, and Dust Masks to prevent inhalation and skin staining.
Packaging
25 kg Bags, 1000 kg Big Bags (FIBC), or 50 kg Drums.