中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 35 No. 8 August 2025 |
（1. School of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. China Rare Earth (Guangxi) Jinyuan Rare Earth New Materials Co., Ltd., Hezhou 542603, China;
3. Department of Physics and Nanotechnology, Faculty of Engineering and Technology,
SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India;
4. Science and Technology Center, MienTrung Industry and Trade College, Phu Yen 56000, Viet Nam）
Abstract:The oxidation characteristics of sulfite and thiosulfate were examined by using thermodynamic calculations and simulated desulfurization solution experiments to investigate their difference. Subsequently, a new multistage oxidation method using oxygen-ammonium persulfate was presented and applied to the oxidation of a real desulfurization solution. The results show that the concentrations of thiosulfate and sulfite in the real desulfurization solution decrease from 48.76 and 61.76 g/L to 2.24 and 0.02 g/L, respectively, and the ammonium sulfate products obtained are white with uniform particles. In addition, compared with ammonium persulfate alone, the multistage oxidation method can reduce the ammonium persulfate addition by 37.56% and treatment cost by 28.13%.
Key words: ammonium persulfate; oxygen; thiosulfate; desulfurization solution; cost
