Journal of the Mining Institute of Japan

In this article we described the practical results of seismic method of prospecting, which we have carried out at Chalai-nor, Manchoukuo in summer 1939.

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The results of a systematic study of the conditions affecting the electrodeposition of manganese from its sulphate solution using diaphragm cell are presented.
Variables investigated include: concentration of addition agents and manganese sulphate, cathodic current density, hydrogen ion concentration of catholyte and temperature.
The behavior of the cathodic deposit and the cathodic current efficiency are improved by the addition of sulphite ion to the catholyte containing manganese sulphate and ammonium sulphate. When the temperature rises over 50°C, however, the presence of the sulphite ion has no beneficial effect and the cathodic current efficiency decreases very rapidly, particularly at low current density.
The preferred bath for obtaining smooth silver-white plates of pure manganese with favorable current efficiency of over 50% contains 0.2-1.0 N-MnSO₄, 100-250 g/L-(NH₄) ₂SO₄ and 0.05-1.36 g/L-S0₂. The preferable cathodic current density, bath temperature and hydrogen ion concentration of catholyte in the porcelain diaphragm is respectively 3-6 A/dm², 20°C-30°C. and pH 3-8.
In larger scale esperiments with a cloth diaphragm under the addition of special reagent, the impurities of the electrodeposited manganese metal are only trace of iron and 0.022-0.05% of total sulphur.

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