Process for recovering lead from lead-containing raw materials

Details Process for recovering lead from lead-containing raw materials Process for recovering lead from lead-containing raw materials

1993-09-03

1994-10-18

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75696, 204104, 423 27, 423109, C22B 1300

Patent

active

053564553

ABSTRACT:
There is proposed a process for recovering lead, comprising the steps of: feeding molten caustic soda, lead-containing feed and an oxygen-containing gas into a reaction some having a temperature of 600.degree. to 700.degree. C. as a result of which there are obtained lead metal withdrawn from the process and a melt containing sodium sulphate, zinc and copper sulphides, and gangue. The melt is discharged from the reaction zone of subjected to a first leaching operation to obtain, as a result, a slurry representing a mixture of solid particles of sodium sulphate, zinc and copper sulphides, gangue and an aqueous solution containing essentially caustic soda. Further on, the slurry is filtered to produce a concentrated aqueous solution containing essentially caustic soda and a solid residue. The concentrated caustic soda solution is subjected to thickening by evaporation and the resulting caustic soda melt is fed into the reaction zone. The solid residue is subjected to a second leaching operation to obtain suspension which is filtered to ultimately produce a cake representing solid particles of zinc and lead sulphides, and gangue having, adsorbed on their surface, a sodium sulphate solution, and an aqueous solution containing essentially sodium sulphate. Said solution is subjected to electrochemical treatment to obtain sulphuric acid withdrawn from the process, and alkali which is fed to said first leaching operation. The cake is washed to obtain a sodium sulphate solution which is fed to said second leaching operation.

REFERENCES:
patent: 4971662 (1990-11-01), Sawyer et al.

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