C - Chemistry – Metallurgy – 05 – D
Patent
C - Chemistry, Metallurgy
05
D
53/22, 71/24
C05D 9/00 (2006.01) C01G 49/14 (2006.01) C05C 3/00 (2006.01) C25C 1/16 (2006.01)
Patent
CA 1058406
ABSTRACT OF THE DISCLOSURE The jarosite residues produced, for example in the precipitation of complex basic iron sulphate from solutions of iron and zinc and/or other metal sulphates in the presence of ammonium and/or potassium ions in the electrolytic refining of zinc, heretofore dumped in copious quantities as waste, is used as at least a component of fertilizer. The jarosite fertilizer production may be integrated with the metal refining process by using a mixture of reagents which provide both ammonium and potassium ions on dissociation in the metal sulphate solution to form mixed ammonium and potassium jarosites. A substantial part of the iron may be separated from the jarosite residues and recovered as oxide or metal. Mineral phosphate, such as rock or bone, may be treated with sulphuric acid, to form superphosphate which may then be admixed with the jarosite residues or with the sulphate sale by-products therefrom to produce a more potent fertilizer. Iron may be recovered as oxide by drying and roasting the separated iron sulphate to drive off volatile materials and metallic iron may be produced by reducing this oxide.
204359
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