Oxidation behaviour of violarite-based nickel concentrate in simulated suspension smelting conditions

S. K. Strömberg*, A. T. Jokilaakso, S. K. Jyrkönen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

A single-particle laminar-flow furnace was used to study the oxidation of a violarite- and pyrite-containing nickel concentrate from the Forrestania mine, Australia. The composition of the reaction gas varied from N2 to N2 + 75 vol% O2 and the gas preheating temperatures ranged from 500 to 1100°C. The degree of oxidation of the material was established through chemical analysis. Optical and scanning electron microscopy were used to determine the morphology and mineralogy of the oxidation products. The concentrate studied was found to be very reactive, and it ignited at ≤500°C. Total desulphurization of this nickel concentrate was observed at 900°C with 50 vol% oxygen in the reaction gas. The microscopical examinations showed that oxidation started with the formation of a porous oxide rim, after which oxidation proceeded either via grain growth of a two-phase structure or via preferential oxidation of the outer layer - both resulting in the formation of oxide crust. Moreover, particles were found to fragment by several different mechanisms.

Original languageEnglish
JournalTRANSACTIONS OF THE INSTITUTIONS OF MINING AND METALLURGY, SECTION C: MINERAL PROCESSING AND EXTRACTIVE METALLURGY
Volume107
Issue numberJAN/APR
Publication statusPublished - Jan 1998
MoE publication typeA1 Journal article-refereed

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