| Reduction of Malay cassiterite by hydrogen gas has been carried out to investigate the effects of hydrogen flow rate, temperature, cassiterite size, and addition of lime and silica. Reduction degree was determined by thermal balance and the reduced cassiterite was examined with microscope and X-ray diffraction. The results from this experimental work were summarized as follows. 1. Reduction was accelerated with increased hydrogen flow rate, but not so much affected above certain limit. 2. The finer cassiterite size was the higher reduction rate and the kinetic equation, r_0(1-(1-R)^(1/3)) =kt, was applied well to the reduction of cassiterite. 3. As temperature was raised, reduction speed was increased, and the activation energy for the hydrogen reduction of Malay cassiterite was 18.2 Kcal/mole. 4. Addition of lime or silica to cassiterite inhibited the reducibility of the ore. |
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