2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 8: Non-ferrous, Rotary Kiln, Ferro-alloys, Rare Earth, Coal
| Editors: | Kongoli F, Xueyi G, Shumskiy V, Kozlov P, Capiglia C, Silva AC, Turna T |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 350 pages |
| ISBN: | 978-1-987820-50-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Investigation of Reaction Mechanism in Oxygen-Enriched Direct Smelting of Jamesonite Concentrate
Xi Dai1; Xiaochen Chen1;1SCHOOL OF METALLURGY AND ENVIRONMENT, CENTRAL SOUTH UNIVERSITY, Changsha, China;
Type of Paper: Regular
Id Paper: 92
Topic: 6
Abstract:
The reaction mechanism of the oxygen-enriched direct smelting process of jamesonite concentrate was studied. With the assistance of FactSage software, the predominance diagram for the Sb-Pb-S-O system at different temperature was drawn. The products of the oxidation reaction for sulphide and the phase stability zone were affected by temperature. The increase of temperature is in favor of the formation of lead-antimony alloy. The phase changes that occurred in the particles of a typical jamesonite concentrate and the reaction products during direct smelting in a laboratory small-scale top blown furnace at 1523K were investigated by X-ray diffraction, scanning electron microscopy with energy-dispersive X-ray spectroscopy, optical microscopy and electron probe microanalysis. In the oxygen-enriched smelting of jamesonite, it was shown from the observation results that the oxidation reaction proceeded by three stages. During the initial step of smelting, the oxidation products were lead-antimony alloy and iron-enriched gudmundite. Then the selective oxidation of sulphides of lead and antimony continued. At the last stage, the ferrous sulphide oxidized and slagged. The formation of the gudmundite inhibited the volatilization of antimony, which led to more antimony in starting material into the alloy phase. The composition of lead-antimony alloy was investigated. It found that there was a small amount of copper and iron in the alloy besides lead and antimony. Copper and iron precipitated in the form of antimony-copper and antimony-iron alloy respectively during cooling of liquid alloy.
Keywords:
jamesonite concentrate;direct smelting;oxygen-enriched;reaction mechanismReferences:
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