Extremely low radiochemical method for neutralizing precipitation slag

• Main Authors: NIU YUQING, ZHI MEIFENG, ZHOU ZHIQUAN, KANG SHAOHUI, ZHAO FENGQI, SHU ZUJUN, WANG HAO, ZHANG JIAYU
• Format: Patent
• Language: Chinese; English
• Published: 01.07.2022
• Subjects: CHEMISTRY; DECONTAMINATION ARRANGEMENTS THEREFOR; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; PHYSICS; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULARRADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to the field of uranium-containing waste treatment, in particular to a method for neutralization precipitation slag extremely low emission. The method comprises the following steps: 1, carrying out multi-stage counter-current extraction on a uranium-containing solution of a nitric acid system by adopting an organic phase containing tributyl phosphate to obtain a tributyl phosphate raffinate water phase; in the nitric acid system uranium-containing solution, the concentration of nitric acid is 1-5 mol/L, the concentration of uranium is 60-160 g/L, the total mass concentration of impurity elements is 40-90 g/L, and the turbidity is 1t; 50 ppm; 2, carrying out multi-stage counter-current extraction on the tributyl phosphate raffinate water phase by adopting an organic phase containing trialkyl phosphine oxide to obtain a trialkyl phosphine oxide raffinate water phase; and 3, neutralizing and precipitating the trialkylphosphine oxide raffinate water phase by adopting a precipitator to prepar