Influence of Salting-Out Effects, Temperature and the Chemical Structure of the Extractant on the Rate of Copper(ii) Extraction From Chloride Media With Dialkyl Pyridine Dicarboxylates

Abstract

ABS1RACTThe kinetics of copper(II) extraction from chloride solutions with ACORGA CLX-50 and three model dipentyl pyridine dicarboxylates having ester groups at various positions in the pyridine ring is investigated. It is shown that the extraction occurs in a diffusional regime and that both the ionic strength and temperature have a strong effect on the rate of copper extraction. Basically, the initial rate of copper extraction (denoted hereafter J0) increases as the ionic strength is increased, whereas J o increases or decreases versus temperature depending on the ionic strength. Such phenomena are explained in terms of salting-out effects and diffusion properties. Furthermore, ACORGA CLX·50 is shown to exhibit a good kinetic performance compared to the three model dipentyl pyridine dicarboxylates.

Improvement of separation efficiency of Cu(II) and Ni(II) in ammoniacal solutions by antagonistic effect of Aliquat336 on LIX84I

“…Compared the stability constants of copper with nickel (Table 1), it can be found that the stability of chloride-bearing metal species is markedly lower than that of metal ammine species. Additionally, some studies indicated that the salting-out effect is favorable to the extraction reaction [31,32]. Because the nickel chloride species is very unstable, the salting-out effect could play a major role during the nickel extraction.…”

Interfacial Complexation of Copper(ii) From Chloride Systems With Extractant Binary Mixture

“…In the previous work [15] it was suggested that the limiting step of the copper(II) extraction by ACORGA CLX-50 from concentrated chloride media could be diffusional in nature. It was confirmed by low values of activation energy (about 20 kJ=mol for moving drop experiments).…”

Copper Extraction From Chloride Solutions With Mixtures of Solvating and Chelating Reagents

“…However, granules of copper are obtained because the electrowinning is carried out from chloride solutions. The extraction of copper from chloride solutions with individual model esters and amides of various pyridinecarboxylic acids was broadly described by us (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20).…”