Abstract
The deposit phenomenon is frequently observed and could prevent the smooth running of the production of fluxed iron ore pellets via the coal-fired grate-kiln process in China. This study investigated the effects of unburnt coal on the deposit formation mechanism in a rotary kiln. The experimental results indicated that the unburnt coal significantly contributed to the deposit formation. The CaO and SiO2 contents of silicates in the deposits increased as the degree of fuel conversion increased, while the content of iron oxides decreased. The locations of the chemical composition of bonding phases in the SiO2-CaO-Fe2O3–10%Al2O3–5%MgO phase diagram moved to a lower melting point. The calculated proportions of liquid phases of the bonding phase showed a trend of increasing as the amount of unburnt coal increased. In summary, the unburnt coal caused a change in the chemical composition of the bonding phases, promoting deposits in the rotary kiln for fluxed iron ore pellet production.
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