Process for precipitating iron as jarosite with a low...

C - Chemistry – Metallurgy – 22 – B

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53/112

C22B 9/00 (2006.01)

Patent

CA 1136860

Abstract: A process for precipitating ferric iron as a jarosite from a sulphate solution containing ferric iron, free acid and valuable non-ferrous metals, characterised by diluting the said solution with a diluent solution of low acidity so that the ferric iron concentration of the diluted solution lies in the range 5 to 35 grams per litre and the free acid concentration lies in the range 5 to 40 grams per litre, heating to a temperature up to the boiling point at atmospheric pressure in the presence of at least one ion from the group consisting of sodium, potassium and ammonium ions, and in the presence of recycled jarosite, without the addition of any neutraliz- ing agent, so that substantially all of the ferric iron is precipitated as a jarosite, followed by separation of the jarosite from the solution, thereby producing a jarosite contaminated with only minor amounts of non-ferrous metals, and a solution containing recoverable valuable non-ferrous metals.

392366

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