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Kinetics and mineral transformations of panzhihua electric furnace titanium slag during oxidation roasting

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Abstract

The thermodynamic results show that the oxidation processing can be divided into three stages, began to convert at 450–800 °C, rapidly convert at 800–1200 °C, and remain unchanged at 1200–1550 °C. The kinetic results show that the chemical reaction control mechanism was dominant in the range of 370–632 °C, and the controlling step shifted to diffusion through the product layer in 851–1035 °C. The activation energies of 40.554 ± 3.182 and 82.723 ± 4.332 kJ mol−1 were calculated for the temperature ranges of 370–632 °C and 851–1035 °C. The transformation rate of rutile increases from 5.4 to 25.1% as the temperature increases from 600 to 800 °C. Then, the transformation rate of rutile rises sharply from 25.1 to 63.7% as the oxidation temperature increases from 800 to 1200 °C. There is a maximum transformation rate of 63.7% at 1200 °C.

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Authors and Affiliations

  1. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China

    Yu-feng Guo, Jian-fa **g, Ling-zhi Yang, Feng Chen, Shuai Wang & **g He

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  1. Yu-feng Guo
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  2. Jian-fa **g
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  3. Ling-zhi Yang
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  4. Feng Chen
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  6. **g He
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Correspondence to Feng Chen.

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Guo, Yf., **g, Jf., Yang, Lz. et al. Kinetics and mineral transformations of panzhihua electric furnace titanium slag during oxidation roasting. Reac Kinet Mech Cat 135, 915–926 (2022). https://doi.org/10.1007/s11144-022-02190-1

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