<Original Papers>Fundamental Researches on Metallurgical Treatment of Manganese Ores.(IV) : Studies on the Electrodeposition of Manganese

With a view to acquiring fundamental researches of the electrodeposition of manganese from a mixed solution of manganese sulfate and ammoniunm sulfate containing a small amount of sulfur dioxide as an addition agent, the present writeres investigated variables which affect the efficiencies of deposition of manganese, i. e., bath composition, current density, speed of agitation and bath temperature. The electrolytic cells, containing about 500 ml of electrolyte, divided three compartments with canvas bags. One copper cathode (4×5cm) and two lead-silver alloy anodes (3.7×4.7cm) were used for electrodes. In all cases a fresh portion of bath was used for each electrolysis run and time of deposition was one hour in nearly all cases. From the results, it may be prefered that the operating conditions for obtaining dense silver-white deposition with current efficiency greater than about 70 per cent are as follows : bath composition Mn 25g/l as MnSO_4 (NH_4)_2SO_4 130g/l SO_2 0.25g/l. current density 5～8A/dm^2 speed of agitation 300 r.p.m. bath temperature 35～40℃