影响浸出母液稀土回收率和产品质量因素

Factors affecting the recovery rate and product quality of the leached mother liquor

摘要

离子型稀土矿浸出液在精制和稀土沉淀分离时会导致部分稀土化学损失，有一些金属杂质与稀土共同沉淀致使碳酸稀土产品杂质超标。文章研究了火山岩型离子型稀土矿浸出液在精制和稀土沉淀分离过程影响稀土损失率及产品纯度的因素并提出优化措施。指出浸出液精制pH值控制5.18~5.55既能使铁离子完全沉淀去除、控制Al₂O₃/TREO比在较低范围，又能降低TREO沉淀损耗率；稀土沉淀分离pH值6.6~7.1间，可兼顾高稀土回收率和低碳酸氢铵单耗；提高碳酸稀土结晶质量减少晶间水、改进固液分离工艺降低含液率，能提升碳酸稀土产品烧得率和纯度。

Abstract

In the process of leaching mother liquor of ionic rare earth ore, the chemical loss of some rare earth will be caused, and some impurities and rare earth ions will jointly precipitate rare earth mineral products impurities exceed the standard. This paper studies the factors affecting the recovery and product quality of rare earth, and proposes the measures to improve the recovery and product quality of rare earth. It is pointed out that the PH value of extracted mother solution between 5.18 and 5.55 can control the ratio of the aluminum trioxide and reduce the REO loss; the PH of purified mother solution between 6.6 and 7.1 can take into account the recovery rate of rare earth precipitation and the consumption of mixed rare earth carbonate crystallization, optimize the solid-liquid separation effect, improve the firing rate of mixed rare earth carbonate, and help increase the total amount of product REO.

关键词

离子型稀土 / 浸出液 / 杂质 / 稀土回收率 / 产品纯度

Key words

ionic rare earth / Leachate / Metal impurities / Rare earth recovery rate / Product purity

参考文献

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