Abstract
The application characteristics of cost-effective commercial medium-grade charcoal (MG charcoal) in the sinter-making process were assessed in this paper. The results showed that, in comparison to high-grade charcoal (HG charcoal), MG charcoal was characterized by a lower fixed carbon content, a higher volatile content, and a higher porosity and specific surface area, which led to its even greater difference in thermochemical behaviors with coke breeze than HG charcoal. This property of MG charcoal resulted in a faster sintering speed, a lower bed temperature, and a shorter holding time above 1200 °C for adhesive mineral melting, which restrained its proper replacement percentage at 20%, while it was 40% for HG charcoal. To achieve a sintering performance similar to the HG charcoal, the combustion behavior of MG charcoal and coke breeze was regulated simultaneously by coating fine-grained iron ore concentrate and adhering CaO, respectively. It was found that coating concentrate was useful to reduce the co...
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