核电厂放射性废保温棉玻璃固化比较研究

为了验证所研发的等离子体系统对废物的适用性,利用等离子体炉熔融模拟核电厂废保温棉,得到了固化体。与实验室马弗炉制得的固化体相比,等离子体炉制得的固化体中同样无晶相结构,成分因炉膛耐火材料的熔蚀而出现差异,抗压强度则更优;二者的元素浸出实验结果相近;等离子体炉的出料实验证实,熔融体的高温黏度适合所选定的出料工艺。这些结果表明,利用所研发的等离子体系统可以得到性能与实验室相当的玻璃固化体,核电厂的废保温棉可以用于含硼浓缩液的玻璃固化。

Comparison Study on Vitrifying Waste Thermal Insulation Wool form NPPs

To verify the applicability of the plasma melting system to the low-and intermediate-level waste from nuclear power plants,waste forms were obtained by vitrifying waste thermal insulation wool with an experimental plasma melter and a laboratory muffle.Physic-chemical properties of the as-received waste forms were analyzed.Compared with the muffle waste form(MF),the waste form from the plasma melter(PF)is amorphous as well.The PF has similar components to the MF except for the higher Al2O3 content,which may be caused by refractory corrosion.The compressive strength of PF is about two times higher than the MF.The plasma melting testes proved that the viscosity of the selected formulation is suitable to the draining process.The results show that the experimental plasma melter can produce satisfactory waste forms as those from laboratory,and the waste insulation wool may be used for vitrifying borate concentrate.