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

망간단괴 매트상 모의 침출용액으로부터 용매추출-전해채취 공정에 의한 구리의 회수

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

  • Received : 2016.01.14
  • Accepted : 2016.02.12
  • Published : 2016.02.29

Abstract

A scale-up test with a continuous solvent extraction and electro-winning system was carried out to separate and recover copper from a synthetic sulfuric acid solution (Cu 10.5 g/L, Co 2.0 g/L, Ni 15.0 g/L, Fe 0.2 g/L). The solution was introduced into mixer-settlers with four stages of extraction and two stages of stripping for continuous countercurrent solvent extraction to separate copper from nickel and cobalt. The loading was carried out using 40% LIX 84-I(v/v) as extractant with a phase ratio of A : O = 1 : 1. Meanwhile, the stripping was undertaken at a phase ratio of A : O = 1 : 1.5 using depleted electrolyte containing 35.0 g/L Cu and 180 g/L $H_2SO_4$ as stripping solution. The extraction and stripping efficiencies were found to be 96.7% and 91.0%, respectively. The copper composition of the stripped solution (pregnant electrolyte) was 50.0 g/L Cu with impurities of 25 ppm nickel, 5 ppm cobalt and 3 ppm iron. In the electro-winning process, copper metal of 99.833 purity was yielded with current efficiency of 98.9% and current density of $1.50A/dm^2$.

Keywords

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

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Acknowledgement

Grant : 해양광물자원 탐사 및 이용기술개발

Supported by : 한국해양과학기술원