摘要
概述了国内外放射性废物的水泥固化和沥青固化处置方法。对用纱罩级硝酸钍生产核纯级四氟化钍过程中的工艺废水经蒸馏回收硝酸后的含较高浓度硝酸和盐的残液进行了水泥固化试验和固化块的水浸出试验。通过调整残液化学组份的浓度可以提高固化块的抗压强度,固化块表面涂沥青层可以有效降低放射性核素的浸出率,防止环境污染。
The disposal methods of radioactive effluent by cement solidification and bituminisation at domestic and overseas are reviewed. After the effluent from the process of producing nuclear grade thorium tetrfluoride with gauze cover grade thorium nitrate being distilled to recovery acid nitrate, much of acid nitrate and salts still remained in residual effluent. Cement solidification tests to residual effluent and leaching with water tests to condensate block are conducted. The compressive strength of condensate block can be increased by adjusting concentrate of chemical components in residual effluent. Painting pitch on surface of condensate block can effectively decreased leaching rate of radioactive nuclides and prevent environment from contaminating.
出处
《湿法冶金》
CAS
2005年第1期33-39,共7页
Hydrometallurgy of China
