R. G. McDonald and B. I. Whittington, “Atmospheric Acid Leaching of Nickel Laterites Review Part I. Sulphuric Acid Technologies,” Hydrometallurgy, Vol. 91, No. 1, 2008, pp. 35-55. doi:10.1016/j.hydromet.2007.11.009

has been cited by the following article:

• TITLE: Experimental Design in Solvent Extraction: A Study for Divalent Metals Separation in D2EHPA/Isoparaffin System

  AUTHORS: Clenilson Da Silva Sousa Junior, Marisa Nascimento, Lídia Yokoyama, Osvaldo Galvão Caldas Da Cunha

  KEYWORDS: Experimental Design; D2EHPA; Solvent Extraction; Divalent Metals

  JOURNAL NAME: Engineering, Vol.4 No.11, November 27, 2012

  ABSTRACT: The solvent extraction process combined with tools of experimental design assists in developing procedures for separation and purification of elements or mineral compounds with high purity. In this work the technique was used to replace the traditional methods for the collection of basic information required for the development of a circuit of solvent extraction. According to the literature, several factors may influence the extraction of divalent metals by D2EHPA in sulfate media, among which the concentration of metals in solution. The objective was to study the variables affecting the separation process Mn/Ni/Co/Cu, such as the aqueous/organic (A/O), contact time, concentrations of the divalent metals in sulfuric medium, pH and solvent concentration. An investigation into the variables that control the process was done using a “cube + star” experimental design, with central point. The results demonstrate it is possible to obtain of a satisfactory mathematical model that describes the process.