Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1974-12-24
1976-02-10
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
423146, C25C 116
Patent
active
039376583
ABSTRACT:
The jarosite process of electrolytic refining of zinc is extended and improved by treating the jarosite residues to recover valuable by-products. The wet jarosite residue is acidified with sulphuric acid from the refining process acid plant to redissolve the iron sulphate, producing a liquid containing dissolved plant nutrients. A substantial part of the iron sulphate is removed by fractional crystallization and the mother liquor is heated to drive off water and produce dry nutrient sulphates to which super phosphate, formed by treating phosphate rock or bone with acid from the refinery acid plant to produce a final enriched fertilizer product.
The iron sulphate solution may be heated to drive off water and roasted to produce iron oxide. If desired, the iron oxide may be reduced to metallic iron.
Water and sulphur products produced in the treatment of the jarosite residues are recovered and integrated into the refinery plant circuits.
REFERENCES:
patent: 3434947 (1969-03-01), Steintveit
patent: 3684490 (1972-08-01), Steintveit
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