Abstract
The intrinsic kinetics for the chlorination of natural rutile in CO−Cl2 gas mixtures were studied in a shallow fluidized bed. The effects of particle size, temperature, and partial pressures of chlorine and carbon monoxide were determined. The chlorination of rutile was found to follow a topochemical reaction scheme, the rate of which can be expressed as eq 7, in the ranges 950 °C ≤ T ≤ 1150 °C and 0.9 kPa ≤ (pCl2, pCO) ≤ 57 kPa, where T is in K, d is in μm, p is in kPa, and t is in min. A reaction mechanism involving lower-valence titanium oxides produced near the surface during chlorination is proposed.
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