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Lead dioxide-plated titanium anode for electrowinning metals from acid solutions.

Authors
Higley-LW Jr.; Dressel-WM; Cole-ER Jr.
Source
Rolla, MO: U.S. Department of the Interior, Bureau of Mines, RI 8111, 1976 Jan; :1-10
Link
NIOSHTIC No.
10007644
Abstract
Electrowinning metals from solutions leached from low-grade ores is becoming an increasingly important extraction method as the metal industry turns to pollution-free recovery processes. Lead-alloy anodes are used industrially in the electrolytic recovery of zinc and copper. However, associated with the use of these anodes are the inherent problems of stability and lead contamination of the cathode. In an effort to eliminate these problems, the Bureau of Mines has developed a relatively inexpensive lead dioxide anode for electrowinning metals from strong acid solutions. The anode was prepared by depositing PbO2 directly on a titanium blank in a strong HNO3-Pb(NO3)2 solution at 2.15 to 6.45 A/dm2 and 60 deg c. This anode was tested in zinc and copper electrowinning cells containing 200 gpl h2so4 and 35 to 100 gpl metal ions at the current density of 3.23 to 6.45 A/dm2. Contamination of the cathode by lead was - <0.005 pct. A 30-day test at 6.45 to 12.90 A/dm2 in an electrolyte containing 200 gpl H2SO4 and no metal ions resulted in a slight change in surface morphology of the pbo2 anode but no measurable change in anode weight or dimensions.
Publication Date
19760101
Document Type
IH; Report of Investigations
Fiscal Year
1976
NTIS Accession No.
PB-250491
NTIS Price
A02
Identifying No.
RI-8111
NIOSH Division
RORC
Source Name
Lead dioxide-plated titanium anode for electrowinning metals from acid solutions.
State
MO
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