Development of New Extractants for Platinum Group Metal Ions in Hydrochloric Acid Solutions

Development of New Extractants for Platinum Group Metal Ions in Hydrochloric Acid Solutions
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盐酸溶液中铂族金属离子新型萃取剂的研制

DOI:
10.1007/978-3-030-92662-5_16
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发表时间:
2022
期刊:
Rare Metal Technology 2022
影响因子:
--
通讯作者:
Narita Hirokazu
Narita Hirokazu
中科院分区:
--
文献类型:
--
作者:
出口結美子;伊藤暁彦;Narita Hirokazu

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溶剂萃取广泛应用于铂族金属离子的分离纯化。本文介绍了我们开发的两个系列的新型萃取剂的钯(II)和铑(III)的氯化物。我们已经发现,硫化物二酰胺型硫代二甘醇酰胺(TDGA)萃取钯(II)氯化物比传统的萃取剂二正己基硫醚(DHS)快得多。与DHS不同,TDGA还显示出对强酸性溶液的高稳定性。用TDGA萃取的Pd(II)可以通过使用氨水反萃取。我们还发现,含酰胺的叔胺(ACTA),特别是二酰胺型ACTA(BisAA:N-正己基-双(N-甲基-N-正辛基-乙基酰胺)胺)和三酰胺型ACTA(TrisAA:三(N-甲基-N-正辛基-乙基酰胺)胺),可以有效地从1-5 mol/L HCl溶液中萃取Rh(III),尽管这些溶液中主要存在通常不可萃取的五氯碘酸盐络合物[RhCl 5(H2O)]2−。这种高萃取效率被认为是[RhCl 5(H2O)]2−和质子化的BisAA或TrisAA分子之间形成独特的外层配位组装体的结果。负载的Rh(III)可以用高浓度的HCl溶液或NaOH水溶液汽提。
Solvent extraction is widely used for the separation and purification of platinum group metal ions. This paper describes our development of two series of novel extractants for Pd(II)and Rh(III) chloridometalates. We have found that sulfide-diamide-type thiodiglycolamides (TDGAs) extract Pd(II) chloridometalates much faster than the conventional extractant di-n-hexyl sulfide (DHS). The TDGAs also show high stability against strongly acidic solutions, unlike DHS. The Pd(II) extracted with the TDGAs can be stripped by using aqueous ammonia. We have also found that amide-containing tertiary amines (ACTAs), especially the diamide-type ACTA (BisAA:N–n-hexyl-bis(N-methyl-N–n-octyl-ethylamide)amine) and the triamide-type ACTA (TrisAA: tris(N-methyl-N–n-octyl-ethylamide)amine), efficiently extract Rh (III) from 1–5 mol/L HCl solutions, even though a typically unextractable pentachlororhodate complex, [RhCl5(H2O)]2−, is dominantly present in these solutions. This high extraction efficiency is considered to be the result of the formation of unique outer-sphere coordination assemblies between the [RhCl5(H2O)]2−and protonated BisAA or TrisAA molecules. The loaded Rh (III) can be stripped with either a highly concentrated HCl solution or a NaOH aqueous solution.
硫代二甘醇酰胺化合物对四氯和四溴钯 (II) 离子的萃取能力比较
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