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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 828 pages |
| ISBN: | 978-0-9879917-0-6 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
Measurement Of Non-isothermal Oxygen Potentials In The Cu-Fe-Ca-S-O Liquid During The Reduction Of Chalcopyrite, Lime, And Carbon Mixtures
Animesh Jha1; 2;1UNIVERSITY OF LEEDS, Leeds, United Kingdom; 2NATIONAL METALLURGICAL LABORATORY, Jharkhand, India;
Type of Paper: Regular
Id Paper: 200
Topic: 4
Abstract:
The reduction of Indian chalcopyrite concentrates from Ghatshila mines with carbon was studied in the presence of lime in the temperature range of 1123K to 1573K. An attempt was made to determine the oxygen potential corresponding to the selective separation of two metals, copper and iron, during the reduction of chalcopyrite by carrying out emf measurements under isochronal heating rate conditions using an yttria-stabilised solid electrolyte cell with Cu/Cu2O as the reference electrode. The isochronal rate data for oxygen potential measurements were analysed by comparing them with the data from isothermal kinetics studies on the reduction of natural and synthetic chalcopyrite minerals in the above temperature range. The analyses of phases formed were carried out using the X-ray powder diffraction and scanning electron microscopic techniques, which showed the presence of a new quinary solid solution CIII phase. The solid solution phase, CIII forms as a result of mixing between the two rhombohedral lattices: high-temperature form of Cu2S and CII (FeO.CaS) compounds. The mechanism of reduction of chalcopyrite with carbon in the presence of lime is illustrated by the explanation of the role of the intermediate phases, CII, CIII and matte phases.