A Study of Impurities in Cobalt Electrowinning

Publisher Website
Google Scholar
Abstract
In electrolyzing a standard fluoborate electrolyte containing 20 g./L cobalt as , 50 g./L boric acid, and 5 g./L NaF at 25 amp./sq. ft. (2.7 amp./dm.2), using lead anodes and stainless steel cathodes, the maximum tolerance for the metallic impurities for the production of satisfactory 7‐hour cobalt electrodeposits is, in mg./L: zinc 10; cadmium 1; arsenic (trivalent) 3; arsenic (pentavalent) 1; antimony (trivalent) 10; mercury (divalent) 1. Trivalent and hexavalent chromium in concentrations up to 100 mg./L were only slightly harmful, while nickel, copper, iron, and manganese were not found deleterious. The impurities may be removed by: (1) recrystallization of ; (2) recrystallization of ; or (3) precipitation of the impurities with under 20 1b./sq. in. (1.4 kg./cm.2) in solutions of a pH 4.0, followed by the familiar iron purification.

This publication has 0 references indexed in Scilit: