三正辛胺(TOA)分离贵金属的系统研究 Ⅰ.反相萃取色层法分离七个贵金属

Systematic Study on Separation of Noble Metals With Trioctyl Amine(TOA)Ⅰ.Separation of Seven Noble Metals by Column Extraction Chromatography

本文系统详细地研究了七种贵金属彼此分离以及与贱金属分离的可能条件。此种工作尚未见报道。用三正辛胺作固定相。分别用1mol/L HCl、6mol/LHCl、2mol/L HNO_3—2mol/L HCl、3mol/L HNO_3-2mol/L HCl、4mol/L HNO_3-2mo1/L HCl和5％硫脲-1mol/L HCl为淋洗液,可以将Rh、Ru、Pd、Pt、Ir、Os、Au分步淋洗下来,达到彼此完全分离。为了使Rh(Ⅱ)与贱金属分离,必须将RhC1_6^(3-)转化为RhBrb_6^(3-),然后在另一色层柱上使它与贱金属分离。合成矿样的分析结果符合分析要求。

Separation of seven noble metals each other and from base metals has been investigated in detail. By column extraction chromatography with TOA as stationary phase, Rh, Ru, Pd, Pt, Ir, Os and Au can be completely separated by means of eluting successively with lmol/L HC1, 6mo1/L HCI, 2mol/L HNO_3-2mo1/L HC1, 3mol/L HN03-2mo1/L HCl, 4mol/L HNO_32mo1/L HCl and 5% thiourea-lmol/L HCI. The second TOA column is used to separate Rh and base metals in which Rh(Ⅱ)must be changed into the form of RhBr6^(3-). The determination of each noble metal is performed by ICP-AES. The determination of seven noblc metals in ores by addtion methods was carried out with good rlSUltS.