Extraction of uranium from tailings by sulfuric acid leaching with oxidants

3rd International Conference on Advances in Energy, Environment and Chemical Engineering

能源学;生态环境科学;化学工业

Huang, Jing^1 ; Li, Mi^1,2 ; Zhang, Xiaowen^1,2 ; Huang, Chunmei^1 ; Wu, Xiaoyan^1

School of Environmental Protection and Safety Engineering, University of South China, Hengyang

421001, China^1

Key Laboratory of Radioactive Waste Treatment and Disposal, University of South China, Hengyang

421001, China^2

关键词: Acid concentrations;    Dilute acids;    Leaching process;    Optimum reaction conditions;    Reaction temperature;    Sulfuric acid leaching;    Technological mineralogies;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/69/1/012050/pdf
DOI  :  10.1088/1755-1315/69/1/012050

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Recovery of uranium have been performed by leaching uranium-containing tailings in sulfuric acid system with the assistance of HF, HClO4, H2O2 and MnO2. The effect of reagent dosage, sulfuric acid concentration, Liquid/solid ratio, reaction temperature and particle size on the leaching of uranium were investigated. The results show that addiction of HF, HClO4, H2O2 and MnO2 significantly increased the extraction of uranium under 1M sulphuric acid condition and under the optimum reaction conditions a dissolution fraction of 85% by HClO4, 90% by HF, 95% by H2O2 can be reached respectively. The variation of technological mineralogy properites of tailings during leaching process show that the assistants can break gangue effectively. These observations suggest that optimum oxidants could potentially influence the extraction of uranium from tailings even under dilute acid condition.