高硫高钠高放废液玻璃固化配方研究

摘要

中核四川环保工程有限责任公司(SEPEC)的高放废液采用玻璃固化法进行处理.这种高放废液中硫和钠的含量高,使得玻璃形成过程中的动力学过程变慢,限制了废物玻璃的包容量,产生“黄相”,对废物玻璃的质量带来不利影响.根据高放废液组成,准备多个废物玻璃配方开展实验室研究和论证,发现适当降低废物玻璃中Si和B的含量,提高碱性,添加Sb2O5和V2O5,以增加玻璃熔体中的氧负离子,有利于废物玻璃包容更多的Na2SO4.对实验室的配方样品进行了比较筛选,改进后提出了最后的推荐配方.使用该配方,在德国PVA(prototype vitrification test facility)冷台架上进行试验验证,废物玻璃中没有出现“黄相”富集,测定了废物玻璃相应的工艺性能和产品质量,结果符合有关工艺和标准的要求.据此,SEPEC高放废液玻璃固化项目(VPC)的初步设计采纳了该配方.%Glass vitrification technology will be used to treat high level liquid waste(HLLW)of Sichuan Environment and Protection Engineering Co.Ltd.(SEPEC).But this kind of HLLW contains high-sulfur and high-sodium,it slows down dynamitic process of the form of glass,restricts oxide loading of the waste glass,and causes yellow phase.That impair the quality of waste glass.Using simulants include many kinds of glass formulations are prepared accordingly to contents of HLLW,and researched and verificated.Decreasing the contents of Si and B in basic glass to raise contain Na2SO4 in waste glass; adding Sb2O5 and V2O5 content to increase oxygen ion in molten glass to increase its basicity.After compared the glass formulations and make improvements in laboratory,then the recommend formulation is given.Using this kind of glass formulation to do cold test on PVA facility to test the process properties and quality of waste glass,without accumulation of a separating yellow phase,the results meet the requests of its standards.Project of SEPEC (VPC) takes this kind of final glass formulation in its basic design documentation.