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Ferrous Sulfate Heptahydrate, 19.7%Fe (FeO4S)

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Ferrous Sulfate Heptahydrate, 19.7%Fe (FeO4S)

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    $88.00 /ton
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With sodium cyanide use for gold cyanide being the preferred route for gold leaching, we are pleased to offer a product that restores harmony between you and your environment even after usage of cyanide.

Ferrous sulphate is used for detoxification of cyanide complexes in gold plant tailings before being channeled to the slimes dam.

It removes residual cyanide in the tailings aqueous solution by rendering it an immobile precipitate through the following reactions:

Fe2+ + 6CN- → Fe(CN)64-,

2Fe2+ + Fe(CN)64- → Fe2IIFeII(CN)6

The insoluble white ferrous ferrocyanide product rapidly absorbs oxygen from the air and turns deep blue, with the formation of ferric ferrocyanide

3Fe2IIFeII(CN)6 + O2+ 4H+→ Fe2III [FeII(CN)6 ]3 ↓ +2Fe2+ + 2H2O



Recommended Method of Application

Ferrous sulphate crystals are dissolved in cold water. The solution at a known concentration is kept in a container from where it is dosed at a rate that just detoxifies the residual cyanide. The optimal conditions for the detoxification reaction include a pH of between 5.5 and 6.5 as well as a Fe: CN ratio of  1:2.



ATC code


CAS number

7720-78-7 (anhydrous) 
17375-41-6 (monohydrate) 
7782-63-0 (heptahydrate) 






22804 (anhydrous) 
56459 (monohydrate) 
22804 (heptahydrate) 




24393 (anhydrous)
62712 (monohydrate)
62662 (heptahydrate)

RTECS number

NO8500000 (anhydrous)
NO8510000 (heptahydrate)


2IDP3X9OUD (anhydrous) 
RIB00980VW (monohydrate) 
G0Z5449449 (dihydrate) 
39R4TAN1VT (heptahydrate) 

UN number



Molecular formula


Molar mass

151.91 g·mol−1


White crystals (anhydrous)
White-yellow crystals (monohydrate)
Blue-green crystals (heptahydrate)




3.65 g/cm3 (anhydrous)
3 g/cm3 (monohydrate)
2.15 g/cm3 (pentahydrate)
1.934 g/cm3 (hexahydrate)
1.895 g/cm3 (heptahydrate)

Melting point

680 °C (1,256 °F; 953 K)
(anhydrous) decomposes
300 °C (572 °F; 573 K)
(monohydrate) decomposes
60–64 °C (140–147 °F; 333–337 K)
(heptahydrate) decomposes

Solubility in water

44.69 g/100 mL (77 °C)
35.97 g/100 mL (90.1 °C)
15.65 g/100 mL (0 °C)
20.5 g/100 mL (10 °C)
29.51 g/100 mL (25 °C)
39.89 g/100 mL (40.1 °C)
51.35 g/100 mL (54 °C)


Negligible in alcohol

Solubility inethylene glycol

6.4 g/100 g (20 °C)

Vapor pressure

1.95 kPa (heptahydrate)

Magnetic susceptibility (χ)

1.24·10−2 cm3/mol (anhydrous)
1.05·10−2 cm3/mol (monohydrate)
1.12·10−2 cm3/mol (heptahydrate)

Refractive index(nD)

1.591 (monohydrate)
1.526–1.528 (21 °C, tetrahydrate)
1.513–1.515 (pentahydrate)
1.468 (hexahydrate)
1.471 (heptahydrate)


View FileFerrous Sulphate Heptahydrate SDS    Size: (119.53 KB)

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