Consolidation mechanism of gold concentrates containing sulfur and carbon during oxygen-enriched air roasting

Consolidation in calcines is a common problem in the oxygen-enriched air roasting of refractory gold concentrates containing sulfur and carbon when the initial temperature is greater than 600?C. To determine the phases that caused consolidation, gold concentrates were roasted under different conditi...

Full description

Saved in:
Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2017-04, Vol.24 (4), p.386-392
Main Authors: Li, Qian, Ji, Fang-zhou, Xu, Bin, Hu, Jian-jun, Yang, Yong-bin, Jiang, Tao
Format: Article
Language:English
Subjects:
Aluminosilicates
Aluminum silicates
Calcines
Calcium
Calcium aluminate
Calcium magnesium silicates
Carbon
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
concentrates
Consolidation
Corrosion and Coatings
Dolomite
Glass
Gold
Liquid phases
Magnesium silicates
Materials Science
mechanisms
Metallic Materials
Muscovite
Natural Materials
Oxidation
Oxygen
Oxygen enrichment
Pyrite
Roasting
Sulfur
Surfaces and Interfaces
Thin Films
Tribology
X-ray diffraction
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Consolidation in calcines is a common problem in the oxygen-enriched air roasting of refractory gold concentrates containing sulfur and carbon when the initial temperature is greater than 600?C. To determine the phases that caused consolidation, gold concentrates were roasted under different conditions and the calcines were mainly detected by X-ray diffraction (XRD). The possible underlying mechanism was then studied through comparisons of the XRD patterns of different calcines. The results indicated that the generation of calcium magnesium silicate, iron-doped calcium aluminosilicate, and calcium aluminate caused the consolidation. Furthermore, an enriched oxygen atmosphere accelerated the oxidation reaction and the emitted heat increased the local temperature in calcines. The local temperature was inferred to have increased to the generation temperature zone of the corresponding liquid phases. Oxidation of the pyrite and decomposition of the dolomite and muscovite mainly occurred at the initial stage of oxygen-enriched air roasting. Calcium was confirmed to be essential to the consolidation process.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-017-1418-1