羧酸盐复合浸取剂对中重稀土浸出强化研究

以缅甸稀土矿与福建稀土矿为研究对象,采用柱浸工艺方法,研究风化壳淋积型稀土矿的矿石性质,分析乙酸铵添加浓度对风化壳淋积型稀土矿轻、中重稀土浸出的影响。结果表明,缅甸和福建稀土矿分别属于中钇型中重稀土选择型稀土矿和富铕轻稀土选择型稀土矿,并且均存在铈负异常和铕负异常现象。乙酸铵最佳添加浓度为0.04mol/L,稀土浸出可达到浸出平衡,浸出率提升到95%,同时乙酸铵主要通过增强钇元素的浸出,使缅甸稀土矿轻/中重稀土比值从1.04下降到0.98,福建稀土矿轻/中重稀土比值从1.65下降到1.47,表明乙酸铵能够明显提高中重稀土的浸出。

Enhance Leaching of Medium and Heavy Rare Earth with Carboxylate Compound Lixiviant

Myanmar rare earth ores and Fujian rare earth ores were studied by column leaching method. Ore properties and effects of ammonium acetate concentration on leaching of light, medium and heavy rare-earth were investigated. The results show that Myanmar rare earth ores and Fujian rare earth ores belong to middle yttrium type middle heavy rare earth ore and europium-rich light rare earth ore respectively and there were negative anomalies of cerium and europium. Leaching efficiency of rare earth rises with addition of ammonium acetate. The optimum addition concentration of ammonium acetate is 0.04 mol/L, rare earth leaching efficiency rises to 95%, and then reach the leaching equilibrium. Ammonium acetate mainly enhances leaching of lanthanum, which leads to drop of ratio of light and medium heavy rare earth in Myanmar rare earth ores from 1.04 to 0.98 and in Fujian rare earth ores from 1.65 to 1.47. Ammonium acetate can significantly improve leaching of medium and heavy rare earth.