ISSN:
1572-8838
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Electrical Engineering, Measurement and Control Technology
Notes:
Abstract Electrolytic manganese (99-98% purity and sulphur) is commercially produced by using sulphate electrolyte at 35° C with the addition of sulphur compounds at current efficiencies of about 60–65%. In the present investigations, adherent, compact and higher purity manganese was obtained by electrolysis in manganese chloride solutions at lower temperature (∼−16° C) without any additives such as sulphur or selenium compounds. A basic study was made to determine the current efficiency of deposition from low temperature chloride electrolytes. Factors affecting the process were: bath temperature, current density, ammonium salt concentration, pH and time of deposition. It was concluded that the electrodeposition of high purity manganese from low temperature chloride electrolyte was feasible. From a comparison between the MnCl2-NH4SO3NH2 and MnCl2-NH4Cl systems adopted, it was shown that the former had the advantage over the latter in its higher current efficiency (87% against 84%) below −8° C, while the latter was superior to the former with regard to its wider range of optimum current density (1–4 A dm−2). The process may be used with advantage when high purity and ductile manganese free of impurities such as sulphur is required and when cooling of the bath is not an important and economic consideration.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00616147
