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

1.真空热分解和氧化燃烧方法：从热力学和实验两方面考察了两种方法的适用性。这两种方法都难以应用于硒砷废料的回收利用。对纯碱熔剂氧化蒸发法的考虑考察了纯碱熔剂氧化蒸发法在不同条件下的适用性。从实验结果可以看出，该方法不适合回收硒砷废料。Se-Pb合金化方法的应用在Se-As合金中，Se-As合金中的Se通过溶解在熔融的铅中，同时砷被蒸发而形成Se-Pb合金。几乎所有的硒都可以被固定为Se-Pb合金，而且蒸发出的砷的纯度非常高。铅的过量添加对分离有不利影响。用氧化燃烧法从Se-Pb合金中分离出硒。从这些结果来看，Se-Pb合金化方法适用于Se-As废物的回收利用。

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.