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

纯碱助熔剂氧化蒸发法完全分离回收硒砷废料

• 批准号: 11650762
• 负责人: FUJISAWA Toshiharu
• 金额: $ 2.3万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650762/
• 关键词: Selenium; Arsenic; Se-As Waste; Photosensitive Drum; Lead; Oxidative Combustion Method; Soda Flux; Se-Pb Alloying Method; ソーダ酸化揮発分離法; 水酸化ナトリウム

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.

1.真空热分解法和氧化燃烧法不仅从理论上而且从实验上验证了这两种方法的适用性。这两种方法都难以应用于硒砷废物的回收.对纯碱助熔剂氧化蒸发法的考虑考察了纯碱助熔剂氧化蒸发法在各种条件下的适用性。从实验结果来看，该方法不适合于硒砷废物的回收. Se-Pb合金化法的应用该方法是将Se-As合金中的硒溶解在铅液中形成Se-Pb合金，同时使砷蒸发。几乎所有的硒都能以硒铅合金的形式固定下来，蒸发砷的纯度很高。铅的过量加入对分离有不利影响。采用氧化燃烧法可从硒铅合金中分离硒。结果表明，硒铅合金化法可用于硒砷废料的回收利用。