Extraction of Ca(II) and Mg(II) from Hydrochloric Acid Solutions by N,N-Dioctyl-1-Octanamine in Methyl Isobutyl Ketone

Abstract

Problem statement: Amines as organic molecules are able to form complexes with metals ions and this is the reason why we can use them to extract metals ions from hydrometallurgical solutions. Approach: Based on that, we have investigated the extraction of Calcium and Magnesium with N,N-dioctyl-1-octammine from the mixture of elements prepared in artificial manner. We investigated the influence of HCl concentration and salts (NaCl, NaI and CH₃COONa) concentration in extraction of two elements (Calcium and Magnesium) from water solutions. All extractions were done from HCl water solutions with c = 3, 6 and 9 mol L^-1 and in presence of NaCl, NaI and CH₃COONa salts, which we prepared in different concentrations. Results: Extraction of Calcium from NaCl solution move from 50-75%, from NaI solution 0-90% and from CH₃COONa solution 37-81%. Extraction of Magnesium from NaCl solution move from 0-10%. In solution of NaI we can not extract the Magnesium and from CH₃COONa solution the extraction of magnesium moves from 0-30%. Conclusion: As optimal condition to separate Calcium from Magnesium is the extraction of Calcium from HCl solution with concentration 9 mol L^-1 in presence of NaI with concentration of 60 g L^-1. Using these condition 90% of Calcium was in organic phase and all of magnesium remains in water phase.