Abstract

Possibility of performing deep purification of lithium hydroxide solutions to remove admixtures of alkaline-earth and transition metals, magnesium, aluminum, uranium, thorium, and radium radionuclides (strontium) by using the sorption and membrane methods has been examined. It was shown that successive procedures of mechanical filtration, ultrafiltration with a ceramic membrane having pore size of 50 nm, and sorption purification on an imine carboxyl cation exchanger make it possible to obtain lithium carbonate with no less than 99.9% main substance. The content of impurities being determined in the sample obtained does not exceed 0.005–0.01 wt %. The specific activity of a sample as regards the sum of alpha- and beta-emitters does not exceed their lower detection limit (less than 0.1 Bq/g).

中文翻译：

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深度纯化锂化合物以去除化学和放射性杂质

摘要

已经研究了通过吸附和膜法对氢氧化锂溶液进行深度纯化以去除碱土金属和过渡金属，镁，铝，铀，th和镭放射性核素（锶）的混合物的可能性。结果表明，依次进行机械过滤，用孔径为50nm的陶瓷膜进行超滤以及在亚胺羧基阳离子交换剂上的吸附纯化的连续步骤使得可以得到主要成分不少于99.9％的碳酸锂。测定的样品中杂质含量不超过0.005-0.01 wt％。关于α-发射体和β-发射体之和的样品比活度不超过其检测下限（小于0.1 Bq / g）。