Solvent Extraction of Iron(III) and Aluminum(III) and Separation from Rhodium(III) in Chloride Solutions Added Tin(II) with Tri-n-octylamine
Solvent Extraction of Iron(III) and Aluminum(III) and Separation from Rhodium(III) in Chloride Solutions Added Tin(II) with Tri-n-octylamine
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用三正辛胺溶剂萃取铁 (III) 和铝 (III) 以及在添加锡 (II) 的氯化物溶液中分离铑 (III)
DOI：
10.4144/rpsj.66.9
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Masakazu Niinae
中科院分区：
文献类型：
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作者：
A. Ishikawa;Takeshi Tanishige;Tasuma Suzuki;Masakazu Niinae
氯化物是铂族金属（PGMs）进入溶液的有效介质之一，因此氯络合物在PGMs分离的过程化学中特别重要。Rh（III）氯代配合物在有机溶剂中的萃取能力较差，这是由于配合物的电荷以及配合物在溶液中的惰性，即形成RhCl 6-n（H2O）n（3-n）-（n = 1-6）。从氯化物溶液中溶剂萃取Rh的问题尚未解决，并且没有用于Rh的有效工业萃取剂。向Rh（III）进料中加入Sn（II）是一种很好的方法，可用于使Rh更容易反应以萃取。然而，杂质如Fe（III）和Al（III）也用氯化物溶液从废汽车催化剂中一起浸出。因此，研究Sn（II）对Fe（III）和Al（III）杂质萃取的影响对于从含Sn（II）的氯化物溶液中萃取Rh具有重要意义。研究了Sn（Ⅱ）对三正辛胺（TOA）从含Sn（Ⅱ）的氯化物溶液中萃取Fe（Ⅲ）和Al（Ⅲ）的影响。Al（III）不与TOA萃取，无论有或没有Sn（II）。同时，随着Sn（II）浓度的增加，Fe（III）的萃取率降低，有机相中Rh（III）和Sn（II）的富集可实现Rh（III）与Fe（III）的分离。
Chloride is one of the effective medium in which platinum group metals (PGMs) can be brought into a solution, thus chlorocomplexes are particularly important in the process chemistry of PGMs separations. Rh(III) chlorocomplexes are poorly extracted into organic solvents, which is due to the charge of the complex as well as those inert character in a solution, that is, formation of RhCl 6–n (H 2 O) n(3–n)– (n = 1–6). The problem of solvent extraction of Rh from chloride solutions has not yet been solved and there is no effective industrial extractant for Rh. Adding Sn(II) to a Rh(III) feed is a good procedure which can be used to make Rh react more easily to extraction. However, the impurities such as Fe(III) and Al(III) are also leached together from spent automobile catalysts with chlo- ride solutions. Therefore, the investigation of effect of Sn(II) on extraction of Fe(III) and Al(III) as impurities is important for the extraction of Rh from chloride solutions added Sn(II). In the present study, the effect of Sn(II) on extraction of Fe(III) and Al(III) from chloride solutions contained Sn(II) with tri-n-octylamine (TOA) was investigated for the separation from Rh(III). Al(III) was not extracted with TOA, either with or without Sn(II). Meanwhile, the extraction of Fe(III) decreased with increase in the concentration of Sn(II) and the separation of Rh(III) from Fe(III) was possible by concentrating Rh(III) and Sn(II) in the organic pahse.