ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Extraction and separation of Cd(II) and Ni(II) with salts of Cyanex 301 and amines

V. I. Kuzmin, M. N. Leskiv, N. V. Gudkova, and D. V. Kuzmin

Institute of Chemistry and Chemical Technology, Krasnoyarsk Science Center SB RAS, Krasnoyarsk, Russia

E-mail: kuzmin-dv@mail.ru

Received: 1 June 2020  Accepted: 22 September 2020

Abstract:

The extraction of cadmium from sulfuric acid solutions and its separation from nickel with salts of bis(2,4,4-trimethylpentyl)dithiophosphinic acid (Cyanex 301) and amines was studied. The data obtained show that extractants based on Cyanex 301 and Quaternary ammonium bases are most suitable for this since it is possible to extract cadmium in the form of sulfates and bisulfates as well as stripping metal from the organic phase. For deep extraction of cadmium from sulfate solutions in this system, 1–2 stages of extraction are sufficient. At this stage, the separation coefficient of cadmium and nickel β_Cd/Ni reaches values > 10⁶, and the distribution coefficient of cadmium reaches almost 10⁴. Cadmium stripping is achieved by treating the organic phase with an ammonia solution containing ammonia more than 4 mol/L. The process can be used in the processing of cadmium–nickel batteries.

Keywords: Nickel–cadmium separation; Solvent extraction; Cyanex 301; Amines

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-020-01373-1

Chemical Papers 75 (3) 1115–1121 (2021)