Effect of Surfactants on the Kinetics of Nickel(II) Extraction by 2-Hydroxy-5-nonylacetophenone Oxime (LIX 84) in an n-Heptane/Water System

Abstract

The initial reaction rates of the extraction of nickel(II) by 2-hydroxy-5-nonylacetophenone oxime (HNAPO) in a two-phase oil/water system was measured using a total internal reflectance static transfer cell. A two-step reaction mechanism between nickel(II) and HNAPO was found to satisfactorily explain the observed initial reaction rate (R(int)). The addition of neutral surfactants, nonionic octaethylene glycol mono-n-dodecyl ether and zwitterionic n-dodecyldimethyl-3-ammonio-1-propanesulfonate, decreased R(int), which could be accounted for with a competitive surface adsorption model. The presence of the anionic surfactant sodium dodecyl sulfate accelerated and then decelerated R(int), while the cationic surfactant dodecyltrimethylammonium chloride caused a decrease. The effects of these charged surfactants were accounted for using a combination of a competitive surface adsorption model and the Boltzmann distribution of charged species.

Environmental-Friendly Process for Recovering Copper and Nickel from Jinchuan Tailings by Silica-Based Selective Adsorbents

“…However, ferric and other ion assemblages will raise a troublesome question of how to efficiently separate copper/nickel from the leachate. Generally, solvent extraction − and the ion exchange , technique are two major methods for the recovery of copper/nickel. Substantial tests proved that organic extractants and solvents used in the solvent extraction process are typically toxic and flammable and tend to cause environmental pollution problems.…”

Modelling of interfacial mass transfer in microfluidic solvent extraction: part II. Heterogeneous transport with chemical reaction

“…Unstirred devices such as static transfer cells have also been used to investigate hydrometallurgical SX kinetics. McCulloch et al (1996) and Warren et al (2006) respectively investigated the extraction of Cu II ions by 7-(4-ethyl-1-methyloctyl)-8-hydroxyquinoline (Kelex 100) and the extraction of Ni II by 2-hydroxy-5-nonylacetophenone oxime (LIX 84). However, in order to achieve reaction-controlled conditions, the reactants were restricted to low concentrations.…”