Basic Research on the high purity metal production using the reaction between various heterogeneous phases

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The followig basic researchs were carried out on the pyrometallurgical reactions between gas-solid, gas-liquid, liquid-liquid, solid-liquid phases, and hydrometallurgical and electrochomical reactions between liquid-liquid phases. These experimental results will be available as important knowledge for production of high purity metals.The activity coefficients of oxygen in liquid alloys were determined by the improbed coulometric titration method and the relation between sulfur and oxygen in liquid alloys were investigated.The content of sulfur in high purity copper was found to be able to decrease less than 1 ppm by means of <10^(-7)> atm with 0.25%.The fire refiuing by vacuum melting applied to molten matts and liquid metals. The distribution coefficients of impurity elements were determined between Cu- <Cu_2> S, Cu- <Cu_2> O, slag-matte and metal-flux.The extraction reactions of less-common metals and precious metals by using aqueous or organic solutions were investigated.The electrochemical behaviors of impurity elements in aqueous or moltn chloride solutions were investigated.