Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1992-08-14
1994-09-20
Bernhardt, Emily
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423 27, 423 36, 423 37, 423 95, 423101, 423106, 423108, 423109, 423141, 423146, C22B 700, C22B 308, C22B 1930
Patent
active
053487133
ABSTRACT:
A process is disclosed for recovering zinc, lead, copper and precious metals from zinc plant residue, said process comprising leaching the residue with return zinc spent electrolyte, neutralizing residual acid and reducing ferric iron in the solution by addition of zinc sulphide concentrate in the presence of a limited quantity of oxygen, flotation of the resulting slurry to separate unreacted zinc sulphide, treatment of flotation tailings with sulphur dioxide and elemental sulphur to further leach iron, zinc and impurity elements and precipitate copper, flotation of the resulting slurry to separate a copper sulphide concentrate, thickening, filtering and washing of the flotation tailings followed by addition of lime and sodium sulphide to activate lead sulphate and flotation of a lead concentrate from the residue. Iron and impurity elements are precipitated from the copper flotation tailings thickener overflow solution by addition of zinc hydroxide sludge, lime and oxygen to produce a high strength, iron free zinc sulphate solution.
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J. M. Boxall and S. E. James, National Zinc Company, Bartlesville, Oklahoma 74003, USA, "Experience with the Goethite process at National Zinc", pp. 676-686 (1987).
Chalkley Michael E.
Collins Michael J.
Kerfoot Derek E.
Bernhardt Emily
Grumbling Matthew V.
Sherritt Gordon Limited
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