What method is suitable for the reduction of Cr2O3?

Question

What method is suitable for the reduction of Cr2O3?

Answer 1

Cr2O3 is a stable oxide and so can not be reduced satisfactorily by coke in the process of smelting. Hence, it is reduced by ALUMINO THERMIC PROCESS. Al has great affinity for oxygen and so large amount of heat is released during reduction which makes the process easy.

Cr2O3 + 2Al   ------>  2Cr  +  Al2O3 + heat

Answer 2

The effects of Cr2O3, Fe2O3 and TiO2 on the crystallization behaviour of glass compositions in the SiO2–Al2O3–CaO–MgO(R2O) system were investigated by DTA, XRD and SEM. It was shown that the simultaneous addition of Cr2O3, Fe2O3 and TiO2 was more effective in inducing bulk crystallization in these glasses. The Avrami constant, n, and activation energy for crystallization of the most promising glass specimens were determined as 3.23 and 253.60 kJ/mol, respectively, suggesting a two-dimensional bulk crystallization mechanism. In this work the best nucleation temperature was determined to be 740 °C. The main crystalline phase detected in the most promising specimens after a two stage 3 h heat treatment at 740 °C and at 885 °C was an aluminium diopside.

yup that shud do

Answer 3

The effects of Cr2O3, Fe2O3 and TiO2 on the crystallization behaviour of glass compositions in the SiO2–Al2O3–CaO–MgO(R2O) system were investigated by DTA, XRD and SEM. It was shown that the simultaneous addition of Cr2O3, Fe2O3 and TiO2 was more effective in inducing bulk crystallization in these glasses. The Avrami constant, n, and activation energy for crystallization of the most promising glass specimens were determined as 3.23 and 253.60 kJ/mol, respectively, suggesting a two-dimensional bulk crystallization mechanism. In this work the best nucleation temperature was determined to be 740 °C. The main crystalline phase detected in the most promising specimens after a two stage 3 h heat treatment at 740 °C and at 885 °C was an aluminium diopside.