Research on the Influence of the Roasting Process of Bastnaesite on the Leaching Rate of Rare Earth AITranslate

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Chinese Library Classification Number:TF845.6[冶金工程—有色金属冶金]

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The effects of roasting process parameters such as concentrate particle size,roasting temperature,roasting time,and material layer thickness on the oxidation rate of roasted ore,praseodymium and neody-mium content in the cerium-rich concentrates,and leaching rate of rare earths,using Yakping bastnaesite concentrate as the raw material.The results indicate that employing smaller concentrate particle size,appropriate roasting temperature(500~525℃)and roasting time(3 h),and controlled material layer thickness(1.1 cm),could enhance the leaching rate of praseodymium and neodymium and reduce the praseodymium and neodymium content in the cerium-rich concentrates.However,due to the additional processing steps and energy consumption required for crushing concentrates,the original concentrate is directly roasted for easier industrial implementation.Under the above optimum conditions,the oxidation rate of roasted ore reaches 95.29%,the leaching rate of praseodymium and neodymium reaches 95.89%,and the praseodymium and neodymium content in the cerium-rich concentrates is minimized to 1.23%.This study provides a reference for achieving efficient praseodymium and neodymium leaching from bastnaesite.