Extraction of zinc-cobalt from sulphate solution of cobalt cake by D2EHPA in the processing of indian ocean nodules

Kumar, Vinay and Bagchi, D and Pandey, B D (2006) Extraction of zinc-cobalt from sulphate solution of cobalt cake by D2EHPA in the processing of indian ocean nodules. Minerals Processing, 77 (5). pp. 299-304.

[img]PDF
Restricted to NML users only. Others may use ->

3079Kb

Abstract

During the processing of Indian ocean nodules, cobalt cake containing zinc in equal proportion is produced. In order to get pure cobalt and zinc from the sulphate leach solution of cake, a solvent extraction process has been considered using an organic extractant, di-(2-ethylhexyl) phosphoric acid (D2EHPA). Separation of cobalt and zinc has been carried out by mixing aqueous and organic phases in a rectangular vessel and separating the phases after equilibration in a glass funnel. The analysis of the metal from the aqueous phase was made by atomic absorption spectrometer to compute the metal transfer. The extraction and separation studies carried out under the different operating conditions indicated favourable zinc extraction at the lower pH (- 2) with partially saponified D2EHPA. The small amount of cobalt co-extracted with zinc was scrubbed with dilute sulphuric acid. With completely saponified D2EHPA, a high degree of cobalt extraction (99.8%) was achieved at aqueous feed pH of 5.0. The flow sheet developed could be used for the selective extraction and separation of zinc and cobalt from the leach liquor of cobalt cake.

Item Type:Article
Official URL/DOI:http://nmlindia.org
Uncontrolled Keywords:Copper bleed solution, solvent extraction, Indian Ocean nodules, cobalt cake, zinc, cobalt, di-(-2ethylheyxl) phosphoric acid.
Divisions:Metal Extraction and Forming
ID Code:2621
Deposited By:Mr. A.K. Sahu
Deposited On:23 Mar 2011 15:51
Last Modified:03 Jan 2012 12:47
Related URLs:

Repository Staff Only: item control page