No abstract

The reaction kinetics of carbon reduction of silica were investigated using thermodynamic concepts and by fitting to relevant models the experimental data obtained for this reduction using a thermogravimetric unit in the temperature range of 1566 to 1933 K. The results show that the only way to produce SiC in this reduction is the reaction of Si, SiO, or SiO2 at the surface or by diffusion of SiO inside the carbon particles while CO and CO2 have no direct effect on the process. The controlling step of this reduction at temperatures lower than 1750 K is the chemical gas–solid or solid–solid reaction at the surface of the carbon particles, while at higher temperatures, the rate of SiO diffusing inside the carbon particles controls the rate of this reduction.

No abstract

No abstract

In the present study, the reduction of in-flight particles of iron ore concentrate by carbon monoxide has been investigated. A mathematical model was developed for simulating the motion of particles in a CO-Ar gaseous mixture within the reactor. Pre-designed experiments were carried out in a fabricated experimental set-up for validating the model. Excellent agreement between the model predictions and the experimental data approved the accuracy of the model. The nucleation and growth model and the fminsearch optimising method were used for investigating the reaction kinetics. The following equation was obtained relevant to CO reduction of the magnetite concentrate particles:[−Ln(1 − X )] 1/0.56 = 1.632 × 10 −3 d −1.637 P C 2.216 CO exp( − 2.196 × 10 5 /RT)t