Abstract
The electrodeposition of Si metal in molten CaCl2 containing various types of calcium silicate has been studied at 1373∼1673 K. It was shown that the influence of the molar ratio of CaO to SiO2 on Si electrodeposition was not remarkable in contrast with our previous results that the molar ratio of CaO to TiO2 strongly affected the Ti metal deposition in the similar system. Silicon metal was obtained on MoSi2 cathode in the melt by potentio-static electrolysis. The cathodic current efficiency was about 30% regardless of the added types of calcium silicate. The current efficiency tended to be better as the electrolysis potential became negative, but the electrolysis below the border potential lead to lower current efficiency due to Ca co-deposition.
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