Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1980-06-12
1982-08-24
Williams, Howard S.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
C25C 116
Patent
active
043459803
ABSTRACT:
In the process for electrowinning of zinc from acid zinc sulfate electrolyte, electrolyte is recirculated to the cells and a portion of the electrolyte is returned to the leaching operation of zinc-bearing material. By only returning electrolyte that overflows from electrolytic cells that contain new and/or recently cleaned anodes to the leaching operation, the amount of sludge in the cells can be reduced, the period between cleanings of cells can be lengthened and the amount of addition agent for controlling the lead content of deposited zinc can be reduced. Electrolyte overflowing from only those cells that contain new and/or recently cleaned anodes is diverted and kept separate from recirculating electrolyte from all other cells by providing separate means for collecting and transferring electrolyte to the leaching operation. Such means may consist of two separate overflow pipes in the cell overflow means, and shut-off means, whereby electrolyte can be directed either into the recirculation circuit or to the leaching operation, or both, as required.
REFERENCES:
patent: 3799850 (1974-03-01), Entshev et al.
patent: 3969203 (1976-07-01), Ramirez
patent: 4153522 (1979-05-01), Arbiter et al.
Metal Finishing, Jan. 1979, vol. 77, No. 13, pp. 130 & 132.
Thompson, Theoretical & Applied Electrochemistry, Revised Ed., N.Y., The Macmillan Co., 1925, pp. 212-213.
Chow Richard T.
Krauss Clifford J.
Ybema Douwe
Cominco Ltd.
Williams Howard S.
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