Influence of a carboxymethyl cellulos (CMC) binder on the mechanical properties of iron ore pellets

Carboxymethyl cellulose is an organic binder used in the iron ore pelletizing industry. The basic principles of how carboxymethyl cellulose (CMC) solutions behave during the pelletizing process and how these principles affect the drop and compression strengths of the pellets are poorly understood. T...

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Bibliographic Details
Published in:Journal of the South African Institute of Mining and Metallurgy 2017-04, Vol.117 (4), p.337
Main Authors: van der Merwe, MCJ, Garbers-Craig, AM
Format: Article
Language:English
Subjects:
Bonding strength
Carboxymethyl cellulose
Cellulose
Compression tests
Compressive strength
Concentrates (ores)
Content analysis
Correlation coefficients
Drop tests
Hematite
Impact tests
Iron and steel industry
Iron compounds
Iron ores
Mechanical properties
Moisture content
Pelleting
Pellets
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Summary:Carboxymethyl cellulose is an organic binder used in the iron ore pelletizing industry. The basic principles of how carboxymethyl cellulose (CMC) solutions behave during the pelletizing process and how these principles affect the drop and compression strengths of the pellets are poorly understood. The aim of the investigation was therefore to gain knowledge on the behaviour of CMC during the pelletizing of haematite concentrate. Haematite pellets with different additions of CMC (0.1-0.4 wt%), were subjected to drop tests, compression tests, and free moisture content analysis. The relationship between the drop strength, compression strength, free moisture content, elapsed time, and CMC concentration was analysed. The drop strength had a strong correlation with the free moisture content of the haematite pellets, with a correlation coefficient of 0.94. The compression strength of the CMC-bonded haematite pellets increased as the free moisture content decreased, reaching a maximum upon depletion of the free moisture content. Haematite pellets with CMC concentrations of 0.1 and 0.2 wt% developed most of their strength within the first day after pelletizing, whereas pellets with concentrations of 0.3 and 0.4 wt% developed most of their strength between one and two days after pelletizing. The time within which CMC-bonded haematite pellets develop most of their strength is therefore dependent on the CMC concentration.
ISSN:0038-223X
2411-9717