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为简化离子型稀土矿提取稀土工艺,采用离子交换树脂富集矿山浸出母液技术制备高纯碳酸稀土用于有机溶料,系统考察了P507煤油萃取剂体系溶解碳酸镨钕过程中碳酸镨钕预处理方式、碳酸镨钕加入量、水相pH、杂质铝含量、反应时间和相比O/A等因素对萃取效果的影响。结果表明,以湿碳酸镨钕为原料,其加入量控制为有机相负载稀土浓度0.16～0.18mol/L,水相pH=2.0～3.0,相比O/A=1,反应时间12min,碳酸镨钕中的铝含量小于2.5%,30℃条件下,碳酸镨钕溶解完全,分相效果好,有机相中稀土浓度达0.177 1mol/L,萃取率为98.13%。采用4级逆流连续萃取试验,经16次反应平衡后有机相出口级稀土浓度为0.166 8mol/L,水相出口稀土浓度为0.001 1mol/L。采用P507煤油萃取剂体系溶解碳酸镨钕同步实现了空白有机相的皂化及萃取过程,碳酸稀土直接作为原料省略了酸分解工序,缩短了工艺流程,同时用作皂化剂,降低了化工材料消耗、废水排放量及环保成本,为简化稀土萃取分离提供了应用基础。
Abstract：In order to simplify extraction process of rare earth from ion-absorbed rare earth deposits,highpurity 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 and0.001 1 mol/L at outlet of aqueous phase after 16 extraction reactions to reach equilibrium applying fourstage 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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基本信息:
中图分类号:TF845
引用信息:
[1]张积锴,周洁英,伍莺,等.P507煤油萃取剂体系溶解碳酸镨钕研究[J].有色金属(冶炼部分),2021(12):86-92.
基金信息:
江西省重点研发计划项目（20202BBGL73116）; 赣州市重点研发计划项目（赣市科发[2020]60号）
2021-11-23
2021-11-23