Complete Separation and Recovery of Se-As Wastes by Oxidative Evaporation Method with Soda Flux

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1. Vacuum Thermal Decomposition and Oxidative Combustion MethodApplicability of titled methods was examined not only thermodynamically but also experimentally. Both methods were difficult to apply for the recycling of the Se-As wastes.2. Consideration of Oxidative Evaporation Method with Soda FluxApplicability of oxidative evaporation method with soda flux was examined at various conditions. From the experimental results, it is concluded that this method is unsuitable for the recycling of the Se-As wastes.3. Application of Se-Pb Alloying MethodIn this method, selenium in the Se-As alloy forms the Se-Pb alloy by dissolving into molten lead while arsenic is evaporated. Almost all selenium could be fixed as the Se-Pb alloy and a purity of evaporated arsenic was very high. Excessive addition of lead had a harmful influence on the separation. Selenium could be separated from the Se-Pb alloy by the oxidative combustion method. From these results, the Se-Pb alloying method is applicable for the recycle of the Se-As wastes.