Kinetic study of Fe removal from precipitated silica prepared from yellow phosphorus slag

Authors

  • Yi Su,

    Corresponding author
    1. Institute of Chemical Engineering, Kunming University of Science and Technology, Kunming 650224, People's Republic of China
    • Institute of Chemical Engineering, Kunming University of Science and Technology, Kunming 650224, People's Republic of China.
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  • Guo Bing Li,

    1. Institute of Chemical Engineering, Kunming University of Science and Technology, Kunming 650224, People's Republic of China
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  • Ju Pei Xia

    1. Institute of Chemical Engineering, Kunming University of Science and Technology, Kunming 650224, People's Republic of China
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Abstract

This purification process may be described by the unreacted shrink core model with solid resultant (inert material) and fixed particle size, which is carried out by the action of nitric acid solution on the precipitated silica obtained from yellow phosphorus slag which was leached with phosphoric acid. The study results indicate that the purification process is a chemical reaction controlling step and its apparent activation energy Ea is 30.354 kJ/mol, with reaction order 0.6746.

Abstract

Le présent procédé de purification peut être décrit par le modèle du noyau rétrécissant non réagi avec la résultante solide (matériau inerte) et la taille de particule fixe. Ce procédé est obtenu par l'action d'une solution d'acide nitrique sur une silice précipitée obtenue à partir des scories de phosphore lavées à l'acide phosphorique. Les résultats de l'étude montrent que le procédé de purification est une étape de contrôle de la réaction chimique, dont l'énergie d'activation apparente Ea est de 30,2354 kJ/mol, avec un ordre de réaction de 0,6746.

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