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The effect of impurities and qdditives on the Electrowinning of zinc.
Fukubayashi-HH; O'Keefe-TJ; Clinton-WC
NTIS: PB 240 143; :1-26
The effect of various zinc electrowinning solution impurities on the surface morphology of deposited zinc was investigated. Impurities studied included al, ag, cd, CO, cr, cu, ge, mn, ni, sb, sn, ti, pbo2, pbso4, and hcl. Also, the effect of animal glue, gum arabic, and na2sio3 additives on the deposited zinc surface structure was studied. Results were compared with deposits from a pure electrolyte consisting of h2so4 and zn+2, 200 and 65 gpl, respectively. Zinc was deposited on an al cathode, 99.9 pct pure, using pt anodes. Time, temperature, current density, and impurity concentrations were controlled. The bulk of the tests were conducted at 40 deg c and 75 a/ft2 (82 ma/cm2). A scanning electron microscope (sem) was used to examine the surface morphology. X-ray diffraction techniques were used to determine crystal orientation, and nondispersive x-ray spectrometer analyses were employed in an attempt to locate impurity concentrations on the zinc deposit when pitting or re-solution occurred. The impurities were categorized by their effect on current efficiency, morphology, and apparent mechanism of h2 evolution from the cathode.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 240 143
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