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| Study on Dissolution of Praseodymium and Neodymium Carbonate with P507-Kerosene Extractant System |
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Received:August 13, 2021
Revised:August 19, 2021
Accepted:August 23, 2021
Published Online:November 19, 2021
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| DOI：doi：10.3969/j.issn.1007-7545.2021.12.013 |
| KeyWord:rare earth carbonate; loaded organic phase; P507; saponification; extraction |
| Author | Institution |
| ZHANG Ji-kai |
赣州有色冶金研究所有限公司 江西 赣州 |
| ZHOU Jie-ying |
赣州有色冶金研究所有限公司 江西 赣州 |
| WU Ying |
赣州有色冶金研究所有限公司 江西 赣州 |
| HU Xiao-mi |
赣州有色冶金研究所有限公司 江西 赣州 |
| CHEN Dong-ying |
赣州有色冶金研究所有限公司 江西 赣州 |
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| Abstract: |
| In order to simplify extraction process of rare earth from ion-absorbed rare earth deposits, high-purity rare earth carbonate was prepared by enriching mine leaching mother liquor with ion exchange resin. Dissolving praseodymium and neodymium carbonate in P507-kerosene extractant system was systematically studied. Effects of praseodymium and neodymium carbonate pretreatment, addition amount, pH value of aqueous, impurity aluminum content, reaction time and phase ratio on extraction effect were studied. The results show that using wet praseodymium and neodymium carbonate as raw materials, its adding amount is controlled as concentration of rare earth in organic phase of 0.16—0.18 mol/L, pH value of aqueous phase is 2.0—3.0, phase ratio is 1, reaction time is 12 min, aluminum content in praseodymium and neodymium carbonate is less than 2.5%, under 30 ℃, the solution of praseodymium and neodymium carbonate is completely dissolved. Concentration of rare earth in organic phase is 0.177 1 mol/L with extraction rate of 98.13%. Rare earth concentration at outlet of organic phase is 0.166 8 mol/L and 0.001 1 mol/L at outlet of aqueous phase after 16 extraction reactions to reach equilibrium applying four-stage countercurrent continuous extraction test. Saponification and extraction of blank organic phase are realized simultaneously by dissolving praseodymium and neodymium carbonate with P507-kerosene extractant system. Rare earth carbonate is directly used as raw material, omitting acid decomposition process and shortening process flow. At the same time, it is used as saponifying agent to reduce consumption of chemical materials, wastewater discharge, and environmental protection cost. It provides an application basis for simplifying extraction and separation of rare earth. |
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