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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Separation of thorium(IV) and extracting rare earths from sulfuric and phosphoric acid solutions by solvent extraction method
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Separation of thorium(IV) and extracting rare earths from sulfuric and phosphoric acid solutions by solvent extraction method

机译：溶剂萃取法分离IV（IV）并从硫酸和磷酸溶液中萃取稀土

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摘要

The bastnasite of Baotou (China) was roasted in concentrated sulfuric acid at 250-300 deg C and the calcined products were leached by water. Almost all rare earths (RE) were moved into solutions in trivalent along with some radioactive impurity thorium(IV) (Th(IV))which accounts for 0.4 percent of RE and other impurities such as Fe(III), Ca, F, P, etc. Through fractional extraction (seven stages for extraction and nine for scrubbing), the mass ratio of Th(IV) and RE (ThO_2/REO) in solution has decreased to 5 X 10~(-6). The purity of ThO_2 product recovered from organic phase is above 99 percent. The iron(III) in solutions can be removed in the form of precipitation by adding some magnesia into the solutions. Then RE can be concentrated by solvent extraction with 2-ethylhexyl phosphinic acid 2-ethylhexylester (P_(507)). The results of fractional extraction show that the concentration of total RE in aqueous solutions stripped by hydrochloric acid is over 200 g REO/l with the yield of RE above 99 percent. Individual RE can be attained by solvent extraction with P_(507) in the following process.
机译：在250-300摄氏度的浓硫酸中焙烧包头（中国）的兽皮，并将煅烧的产品用水浸出。几乎所有的稀土（RE）和一些放射性杂质th（IV）（Th（IV））都进入了三价溶液，这些杂质占RE的0.4％，还含有其他杂质，如Fe（III），Ca，F，P通过分步萃取（萃取七个阶段，洗涤九个阶段），溶液中Th（IV）和RE的质量比（ThO_2 / REO）降低至5 X 10〜（-6）。从有机相中回收的ThO_2产物的纯度高于99％。溶液中的铁（III）可以通过在溶液中添加氧化镁以沉淀的形式除去。然后可以通过用2-乙基己基次膦酸2-乙基己酯（P_（507））进行溶剂萃取来浓缩RE。分级萃取的结果表明，用盐酸汽提的水溶液中总RE的浓度超过200 g REO / l，RE的收率超过99％。可以在以下过程中通过用P_（507）进行溶剂萃取来获得单个RE。

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