Solubility of radioactive inorganic salt in supercritical water

• DOI: 10.1007/s10967-018-5939-5
• Publication Date: 2018-06-08T11:18:22Z
• Authors: Qiang Qin; Shuai Wang; Honghua Peng; Yanbo Qiao; Hong Zhang; Kai Wang; Xueyang Liu; Zhenghua Qian; Liubin He; Jun Cai; Yulan Li; Xiaobin Xia
• Keywords: Supercritical water oxidation; Solubility equilibrium

In order to reduce the deposition of inorganic salt in continuous reactor during the treatment of radioactive spent extraction solvent by supercritical water oxidation, the solubilities of five kinds of radioactive inorganic salts were investigated at temperatures from 390 to 550 °C and pressures from 20 to 25 MPa. The solubilities of inorganic salts were correlated via a semi-empirical approach based on the phase equilibrium between the salt and supercritical water. In addition, parallel hydrolysis of the salts was found as it could be observed from decrease in pH and deviations of anion and cation concentration in the liquid effluent.