Effect of manganese(II) and boric acid on the electrowinning of cobalt from acidic sulfate solutions

Citation
Bc. Tripathy et al., Effect of manganese(II) and boric acid on the electrowinning of cobalt from acidic sulfate solutions, MET MAT T B, 32(3), 2001, pp. 395-399
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Metallurgy
Journal title
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
ISSN journal
1073-5615 → ACNP
Volume
32
Issue
3
Year of publication
2001
Pages
395 - 399
Database
ISI
SICI code
1073-5615(200106)32:3<395:EOMABA>2.0.ZU;2-R
Abstract
The effect of Mn(II) and boric acid on the electrowinning of cobalt from ac idic sulfate electrolyte was investigated by electrochemical methods. The r esults indicated that the presence of Mn(II) or boric acid alone increased the current efficiency by 2 to 3 pet but that their combination had no addi tional effect. The preferred crystal orientation pattern changed from (110) (100) (101) to (100) (110) (101) in the presence of 0.1 to 10 g dm(-3) Mn( II); an additional change, to (110) as the only preferred orientation, occu rred at a very high concentration of Mn(II) (100 g dm(-3)). Boric acid had no effect on the crystal pattern of the cobalt deposits. In general, the pr esence of boric acid increased the brightness of all the deposits, irrespec tive of the presence of Mn(II) in the electrolyte, and had no effect on the deposit morphology. The cathode polarization behavior of the cobalt electr ocrystallization was affected only marginally by the presence of Mn(II) in the electrolyte, but the presence of boric acid with or without Mn(II) had a significant effect. Boric acid was found to suppress the rate of electror eduction of cobalt on stainless steel by an order of magnitude, irrespectiv e of the presence of Mn(II).