Influence of a carboxymethyl cellulose (CMC) binder on the mechanical properties of iron ore pellets
| Autor: | M.C.J. Van der Merwe, A. M. Garbers-Craig |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
musculoskeletal diseases
haematite pellets carboxymethyl cellulose Materials science Metallurgy digestive oral and skin physiology Metals and Alloys technology industry and agriculture compression strength 02 engineering and technology macromolecular substances Geotechnical Engineering and Engineering Geology Pelletizing 020501 mining & metallurgy Degree (temperature) Carboxymethyl cellulose drop strength Compressive strength CMC fibres 0205 materials engineering Polymer chemistry Materials Chemistry medicine free moisture content medicine.drug |
| Zdroj: | Journal of the Southern African Institute of Mining and Metallurgy, Volume: 117, Issue: 4, Pages: 337-341, Published: APR 2017 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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