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Recovery of Cobalt from Synthetic Leaching Solution of Manganese Nodule Matte by Solvent Extraction-electrowinning

용매추출-전해채취법에 의한 망간단괴 매트상 모의 침출용액으로부터 코발트 회수

Kim, Hyun-Ho;Nam, Chul-Woo;Park, Kyung-Ho;Yoon, Ho-Sung;Kim, Min-Seuk;Kim, Chul-Joo;Park, Sang-Woon
김현호;남철우;박경호;윤호성;김민석;김철주;박상운

  • Received : 2016.02.26
  • Accepted : 2016.04.07
  • Published : 2016.04.30

Abstract

A scale up tests (380 kg/day) using a continuous solvent extraction and electro-winning system was carried out to separate and recover cobalt from a solution containing 1.91 g/L Co and 14.65 g/L Ni. The solution was obtained during a process including solvent extraction and precipitation stages for removal of Cu and Fe from a synthetic sulfuric acid solution of manganese nodule matte. The optimal condition for solvent extraction was : solvent concentration of 0.22M Na-Cyanex 272 (45% saponified with NaOH) and O:A phase ratios of 1:1.5, 10:1 and 1.5:1 used in extraction, scrubbing and stripping stages, respectively. The extraction and stripping efficiencies were found to be 99.8% and 99.88%, respectively. The stripped solution contained 40.27 g/L Co with 4 ppm Ni. Cobalt metal of 99.963% purity was yielded with current efficiency of 67% and current density of $0.563A/dm^2$ during the electro-winning process.

Keywords

Manganese nodules;Cobalt recovery;Solvent extraction;Electro-winning

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Acknowledgement

Grant : 해양광물자원 탐사 및 이용기술개발

Supported by : 한국해양과학기술원