<論文>溶液SnO-SiO_2系中のSnOの活量測定

概要

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In the pyrometallurgical treatment of tin, it has been known that the selection of optimum slag composition has a significant to promote a smelting efficiency.In order to decide the slag composition, it is essential to investigate the thermodynamic characteristics of the molten slag, such as the activity of SnO in the slag.In the present study, the activity of SnO in the molten SnO~SiO, binary system which is the basic system of tin smelting slag was studied by EMF method using a zirconia solid electrolyte, and then the influence of addition of CaO, FeO and Aba, components on the activity of SnO was also examinated.The results obtained are summarized as follows:1) The activity of SnO in the molten SnO-SiO, system shifts from positive tonegative compared with Raoult's low as the molar ratio of SiO, is raised.2) The activity of SnO raises by additing CaO to SnO-SiO, system, and this effecttend to be remarkable with increase of Si02 content in the slag.3) The influence of FeO addition on the activity of SnO in SnO - SiO, system isnot observed remarkably, but the activity of SnO raises slightly only in thecase in which Si02 content in slag is high.4) The influence of Al,O, addition on the activity of SnO in the SnO-SiO, systemis not so observed.
秋田大学の論文