Synergistic extraction of rare earths by mixture of HDEHP and HEH/EHP in sulfuric acid medium
来源期刊：Journal of Rare Earths2008年第5期
论文作者：张永奇 李建宁 黄小卫 王春梅 朱兆武 张国成
文章页码：688 - 692
摘 要：The extraction of RE（III） （RE=La, Nd, Sm, Gd） in sulfuric acid medium using the mixture of HDEHP（H2B2） and HEH/EHP（H2L2） was investigated. The synergistic enhancement coefficient（R） was calculated for La （1.96）, Nd（3.52）, Sm（5.96）, and Gd（5.71）, respectively, at pH=2.0, and it was seen that the R increased with the increase of aqueous quilibrium pH. The configuration of the extracted complexes was considered to be RE（SO4）xH2x（HB2）3 with HDEHP, RE（SO4）xH2x（HL2）3 with HEH/EHP, and RE（HB2）2（HL2） with their mixture as the extractant with the slope method. The equilibrium constants and stability constants were calculated. A cation exchange mechanism was pro- posed as well.
张永奇，李建宁，黄小卫，王春梅，朱兆武，张国成
摘 要：The extraction of RE（III） （RE=La, Nd, Sm, Gd） in sulfuric acid medium using the mixture of HDEHP（H2B2） and HEH/EHP（H2L2） was investigated. The synergistic enhancement coefficient（R） was calculated for La （1.96）, Nd（3.52）, Sm（5.96）, and Gd（5.71）, respectively, at pH=2.0, and it was seen that the R increased with the increase of aqueous quilibrium pH. The configuration of the extracted complexes was considered to be RE（SO4）xH2x（HB2）3 with HDEHP, RE（SO4）xH2x（HL2）3 with HEH/EHP, and RE（HB2）2（HL2） with their mixture as the extractant with the slope method. The equilibrium constants and stability constants were calculated. A cation exchange mechanism was pro- posed as well.
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