低品位沉积型稀土矿硫酸浸出液的水解除杂研究  

Impurity Removal from Sulfuric Acid Leachates of Low-Grade Sedimentary Rare Earth Ores through Hydrolysis Precipitation

作　　者：徐璐[1,2] 龚大兴[1,2] 胡久刚 陈容容[3] 谭军 XU Lu;GONG Daxing;HU Jiugang;CHEN Rongrong;TAN Jun(Institute of Multipurpose Utilization of Mineral Resources,Chinese Academy of Geological Sciences,Chengdu 610041,China;Technology Innovation Center of Rare Earth Resources Development and Utilization,China Geological Survey,Chengdu 610041,China;College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中国地质科学院矿产综合利用研究所,四川成都610041 [2]中国地质调查局稀土资源应用技术创新中心,四川成都610041 [3]中南大学化学化工学院,湖南长沙410083

出　　处：《金属材料与冶金工程》2021年第2期35-40,共6页Metal Materials and Metallurgy Engineering

基　　金：中国地质调查局基础地质调查项目资助(DD20189507);湖南省自然科学基金(2019JJ30031)。

摘　　要：针对贵州毕节-六盘水地区沉积型稀土矿硫酸浸出液铝含量高、稀土含量低的特点,采用水解沉淀法对铁铝进行预分离,研究了温度、碱性物质种类和加入量等因素对杂质去除效果及稀土损失行为。结果表明,在pH>4.0时Al、 Fe去除率可达95%以上,但稀土损失率随溶液pH升高显著增加;升高温度至45℃以上可明显降低La、 Ce、 Pr、 Nd的损失;氧化镁、氧化钙、碳酸氢钠、氢氧化钠在pH>4时均具有较好的除杂效果,采用MgO作为沉淀剂,在45℃、 pH=4左右可以去除95%以上的杂质,而且渣量小、稀土损失少。Based on the characteristics of high aluminum and low rare earth content in the sulfuric acid leaching solution of the sedimentary rare earth ores in Bijie-Liupanshui area in Guizhou Province, the aluminum was pre-separated by hydrolysis precipitation method.The effect of temperature, types and amounts of alkaline substances on impurities removal and rare earth loss behavior were studied.The results showed that the removal rate of Al and Fe can be over 95%at pH>4.0, but the loss rate of rare earth increases significantly with the increase of pH. The loss of La, Ce, Pr, and Nd could be decreased obviously by increasing the temperature beyond 45℃. Magnesium oxide, calcium oxide, sodium bicarbonate, sodium hydroxide have good impurity removal efficiency at pH>4.0. Using MgO as a precipitant, more than 95% of impurities can be removed at p H=4 and 45 ℃, and the amount of formed slag and the lost rare earth is small.

关 键 词：沉积型稀土矿 硫酸浸出液 除杂 铝 

分 类 号：TF111.3[冶金工程—冶金物理化学]