{"title":"Selective Solvent Extraction of Calcium and Magnesium from Concentrate Nickel Solutions Using Mixtures of Cyanex 272 and D2EHPA","authors":"Alexandre S. Guimar\u00e3es, Marcelo B. Mansur","volume":113,"journal":"International Journal of Materials and Metallurgical Engineering","pagesStart":515,"pagesEnd":519,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10004297","abstract":"
The performance of organophosphorus extractants Cyanex 272 and D2EHPA on the purification of concentrate nickel sulfate solutions was evaluated. Batch scale tests were carried out at pH range of 2 to 7 using a laboratory solution simulating concentrate nickel liquors as those typically obtained when sulfate intermediates from nickel laterite are re-leached and treated for the selective removal of cobalt, zinc, manganese and copper with Cyanex 272 ([Ca] = 0.57 g\/L, [Mg] = 3.2 g\/L, and [Ni] = 88 g\/L). The increase on the concentration of D2EHPA favored the calcium extraction. The extraction of magnesium is dependent on the pH and of ratio of extractants D2EHPA and Cyanex 272 in the organic phase. The composition of the investigated organic phase did not affect nickel extraction. The number of stages is dependent on the magnesium extraction. The most favorable operating condition to selectively remove calcium and magnesium was determined.<\/p>\r\n","references":"[1]\tA. S. Guimar\u00e3es, P. S. Silva, and M. B. Mansur, \u201cPurification of nickel from multicomponent aqueous sulfuric solutions by synergistic solvent extraction using Cyanex 272 and Versatic 10\u201d, Hydrometallurgy, 150, 173-177, 2014.\r\n[2]\tL. H. Santos, P. L. G. Carvalho, G. D. Rodrigues, and M. B. Mansur, \u201cSelective removal of calcium from sulfate solutions containing magnesium and nickel using aqueous two phase systems (ATPS)\u201d, Hydrometallurgy, 156, 259-263, 2015.\r\n[3]\tD. S. Flett, \u201cSolvent extraction in hydrometallurgy: the role of organophosphorus extractants\u201d, Journal of Organometallic Chemistry, 609, 2426-2438, 2005.\r\n[4]\tM. B. Mansur, M. J. Slater, and E. C. Biscaia Jr., \u201cEquilibrium analysis of the reactive liquid\u2013liquid test system ZnSO4\/D2EHPA\/n-heptane\u201d, Hydrometallurgy, 63, 117-126, 2002.\r\n[5]\tR. K. Biswas, M. A. Habib, and M. N. Islam, \u201cSome physicochemical properties of (D2EHPA). 1. Distribution, dimerization, and acid dissociation constants of D2EHPA in a kerosene\/0.10 kmol m-3 (Na+,H+)Cl- system and the extraction of Mn(II)\u201d, Industrial & Engineering Chemistry Research, 39, 155-160, 2000.\r\n[6]\tS. Amer, and A. Luis, \u201cThe extraction of zinc and other minor metals from concentrated ammonium chloride solutions with D2EHPA and Cyanex 272\u201d, Revista de Metalurgia de Madrid, 31(6), 351-360, 1995.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 113, 2016"}