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Start Over Author "Lv Guozhi" Publisher elsevier bv
21 results on '"Lv Guozhi"'

3. Effect of NH4Cl on the rusting leaching behavior of metallic phase of iron in reduced ilmenite during TiO2 purification : An electrochemical and density-functional theory study

Author

Zhou, Lei, Zhao, Qiuyue, Lv, Guozhi, Dou, Zhihe, Mu, Wangzhong, Zhang, Ting-an, Zhou, Lei, Zhao, Qiuyue, Lv, Guozhi, Dou, Zhihe, Mu, Wangzhong, and Zhang, Ting-an

Abstract

Ilmenite is the primary feedstock for the manufacturing of titanium goods, however it needs to be refined before the usage. Becher is an eco-friendly process for refining ilmenite by rusting metallic iron from reduced ilmenite to separate iron and TiO2, and NH4Cl is the commonly utilized solvent in this method. In the current study, the contribution of NH4Cl was investigated by comparative analysis of the rusting leaching behavior of iron in the Becher process environment, and the solvents including NH4Cl, CH3COONH4, NaCl and CH3COONa were selected. Electrochemical measurements including potentiodynamic polarization analysis, electrochemical impedance spectroscopy as well as surface morphology analysis utilizing scanning electron microscopy and atomic force microscopy were performed. The obtained results indicate that NH4Cl has the highest rusting rate, with NH3 playing the most important role than Cl-. The presence of ammonia prevents the formation of an oxide film on the iron surface. The DFT calculation reveals the NH3 adsorption on the Fe surface enhances Fe susceptibility to electron loss, consistent with the experimental observation of NH3-accelerated iron corrosion. The obtained understanding and methodology sheds lights on the mechanism of NH4Cl action and offers new insights for the study of rusting leaching catalysts., QC 20231017

Published
2023
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