M. Lundström, J. Aromaa
In this study we aim to identify the factors affecting the rate of chalcopyrite leaching in the presence of cupric ions, in concentrated chloride solutions. Experiments were carried out near the boiling point of the solution (T = 90 °C) at atmospheric pressure with [NaCl] = 280 g/l and [Cu2+] = 1-40 g/l at pH = 2. Electrochemical methods such as cathodic polarization and cyclic voltammetry were used to investigate the solution reactions, specifically the cathodic reactions of copper complexes. To identify the nature and the rate-controlling steps of the reactions rotating disk electrodes were also used. The environment studied is similar to that of the Outokumpu HydroCopperTM process. HydroCopperTM is a novel process for leaching copper from chalcopyrite using cupric chloride solution. The dissolution rate of chalcopyrite depends on the formation of a reaction product layer on the mineral surface. Also thermodynamic and/or kinetic factors of cathodic reactions can affect the nature of the leaching. The results from this study suggest that in the typical redox-potential range of an HydroCopperTM type environment, the dissolved copper exists mainly as the complex [CuCl]+. The diffusion coefficient and the unit rate constants for the solution species were calculated. Also the exchange current density and rate constant for electron transfer was estimated. A simulation was made of the cathodic polarization curve and compared with the experimental results. The cathodic reaction rate did not appear to limit the rate of chalcopyrite dissolution in concentrated cupric chloride environment.
@article{46b08854-b835-4854-9a81-af10b50dd37f,
title={Factors affecting chalcopyrite dissolution in NaCl-CuCl2 solutions},
author={M. Lundström and J. Aromaa},
year={2003},
language={en}
}TY - JOUR TI - Factors affecting chalcopyrite dissolution in NaCl-CuCl2 solutions AU - M. Lundström AU - J. Aromaa PY - 2003 LA - en ER -
The leachability tests for manufacturing scrap TV boards (STVB) have indicated the release of metals beyond the limit levels with potential problems f
Ionela Birloaga, Ida De Michelis, Francesco Ferella, Mihai Buzatu, Francesco Vegliò
This study investigates the hydrometallurgical recovery of copper and gold from waste printed circuit boards (WPCBs) using a sequential oxidative leac
Printed circuit boards (PCBs) from electronic gadgets at the end of their useful life period are currently being dumped in landfills or incinerated, c
MBUYA ILUNGA Bienvenu, TSHIBANDA NTAKAMUTSHI Patrick, MUHUNGU TSHUYI Symphorien, KAWAMA NGOIE Francis, KASONGO KALENGA Gigi, NKULU WA NGOIE Guy
The current technological and economic constraints impose the development of efficient and eco-friendly processes for the simultaneous treatment of su
Mark E. Schlesinger, Matthew J. King
This book presents a comprehensive overview of the principles and practices of copper extraction metallurgy. The objective is to provide both a theore
Copper solvent extraction units at large hydrometallurgical plants face constraints in metal recovery, phase disengagement, and reagent consumption, d