Conversion of Chloride Wastes to Oxides by Microwave Heated Oxugen Plasma

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The oxygenation reaction of metal chlorides were tested by using the microwave heated oxygen plasma and their results were compared with the calculated equilibrium diagrams. The oxygenation characteristics by the oxygen plasma were concluded as follows.1. The experimental results of typical chlorides showed qualitatively how ease or hard their oxygenation are. Each experimental result of typical samples can be explained well by its calculated equilibrium diagram.2. Although in our experimental conditions, all of sample chlorides could not be oxygenated even if using the oxygen plasma. The equilibrium phase diagrams for the most of metal chlorides which appears in the waste showed that their oxides can be obtained if the high temperature conditions are given. The microwave heated oxygen plasma can be a strong tool for such a oxygenation reaction of metal chlorides wastes.3. The oxygenation characteristics were classified into three categories according to their oxygenation difficulties. For the oxygenation of the clorides of the magnesium type category, it is importantant to remove chlorine to shift the equilibrium by using a remover such as hydrogen. For the oxygenation of chalorides of the strontium type element whose oxides exist only as gas phase in high temperature region, the reaction quenching technique such as rapid cooling is required. The chlorides of the celium type can be oxygenated easily.