THE SYNERGISTIC MECHANISM OF SOLVENT EXTRACTION OF GOLD IN HCl MEDIA WITH TOA AND TOPO

来源期刊：中南大学学报(英文版)1999年第1期

论文作者：Yang Tianzu Shui Chenjing Bin Wanda

文章页码：29 - 32

Key words：gold; synergistic extraction; hydrochloric acid media; mechanism of extraction

Abstract: The mechanism of synergistic extraction of gold in HCl media was researched with tri-n-octyl amine(TOA) and tri-noctyl phospine oxide(TOPO). Itwas determined that the composition of synergistic extract is (TOAHTOPO)AuCl₄; the constant of synergistic extracting equilibrium is 10^9.20; and the synergistic reaction is exothermic with -17.187 kJ/K·mol of ΔH₂₉₈. The extraction mechanism was also studied bythe IR-spectra and UV-spectra. It is found that the extractionmechanism belongs to ion-as- sociation type.