Kinetic modeling of the reaction rate for quartz and carbon pellet

Abstract

Kinetic modeling of quartz and carbon pellet at temperatures of 1898 K, 1923 K, and 1948 K (1625 °C, 1650 °C, and 1675 °C) was investigated in this study. The carbon materials used were charcoal, coke, coal, and preheated coal. The overall SiC producing reaction can be described by the reaction SiO2 + 3C = SiC + 2CO. In the SiC-producing step, the reaction rate of quartz and carbon pellet can be expressed as d pctdt=(1−0.40×X−0.86fix - C×FC×pct)×A×exp(−ERT)d pctdt=(1−0.40×Xfix - C−0.86×FC×pct)×A×exp⁡(−ERT) The carbon factor FC was used to describe the influence of different carbon materials that effect the gas–solid interface reaction. For charcoal, coke, coal, and preheated coal, the FC values were 0.83, 0.80, 0.94, and 0.83, respectively. The pre-exponential factor A values for the preceding four carbon materials were 1.06 × 1016 min−1, 4.21 × 1015 min−1, 3.85 × 109 min−1, and 1.00 × 1025 min−1, respectively. The activation energies E for the SiC-producing step were 570, 563, 336, and 913 kJ/mole for charcoal, coke, coal, and preheated coal pellets, respectively.