Separation of Rare Earth and Aluminium by Long-chain Polymeric Phosphate Complexation Precipitation
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摘要:
在离子型稀土矿浸出过程中，稀土浸出的同时大量的非稀土杂质如铝离子也会进入稀土浸出液中。本文针对稀土浸出液中杂质铝离子的去除问题展开研究，采用聚磷酸丁二酯选择性络合沉淀料液中的稀土元素，分别考察了溶液pH、聚磷酸丁二酯的量、反应时间、反应温度对除铝效果的影响，结果表明：以聚磷酸丁二酯作为络合沉淀剂，控制模拟料液的pH值为2.5、加入m（聚磷酸丁二酯单体）：m（RE3+）=12：1当量的聚磷酸丁二酯、反应时间为10 min、反应温度为50℃时，稀土的沉淀率为91.35%，铝的共沉淀率为11.22%，有效地实现了稀土与铝的分离。
Abstract:In the leaching process of ionic rare earth ore, a large number of non-rare earth impurities such as aluminum ions will also enter the leaching solution. In this paper, the removal of impurity aluminum ions in the rare earth leaching solution was studied. The rare earth elements in the feed solution were selectively precipitated by polybutylene phosphate. The effects of solution pH, amount of polybutylene phosphate, reaction time and reaction temperature on the removal effect of aluminum were investigated respectively. The results show that: polybutylene phosphate is used as a complex precipitation agent, the pH value of the simulated feed liquid is controlled to 2.5, the polybutylene phosphate dosages is m(REG monomer): m(RE3+)= 12:1 equivalent is added, the reaction time is 10 min, the reaction temperature At 50 ℃, the precipitation rate of rare earth is 91.35%, and the precipitation rate of aluminum is 11.22%, which effectively separates rare earth from aluminum.
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Key words:
- rare earth /
- aluminum removal /
- polybutylene phosphate /
- complex precipitation /
- separation
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