Experimental Study on Plasma Melting Treatment of Simulated Non-Combustible Radioactive Waste

The melting treatment and isotopic tracing experiments were carried out on a self-designed plasma bench melting test with glass solidification formulas of single waste as well as mixed waste of glass fiber, concrete and soil. After melting at 1 100-1 300 ℃ for 1 h, all the four samples were turned into glass waste-forms. The density, leaching and mechanical performance of resultant glass waste-forms were tested, showing the comparable requirement with the radioactive waste glasses. The results of the tracer experiment show that the plasma melting system has high interception rate for the tracer elements Co, Cs and Sr. In addition, the glass waste-forms has higher curing capacity for Co and Sr, but lower for Cs. In engineering application, it is suggested to add a pretreatment system such as granulation at the front of the melting furnace system to reduce the proportion of material directly entering the flue gas purification system and improve the solidified efficiency of the materials.