Mathematical and Statistical Process Modeling of Hydrochloric Acid Leaching of Iron-Oxide Impurity from Inyi Kaolin: Response Surface Methodology

Authors

  • John Sunday Uzochukwu Department of Chemical Engineering, Nnamdi Azikiwe University, Awka, Nigeria
  • Onu Chijioke Elijah Department of Chemical Engineering, Nnamdi Azikiwe University, Awka, Nigeria
  • Ohale Pascal Enyinnaya Department of Chemical Engineering, Nnamdi Azikiwe University, Awka, Nigeria
  • N. Nweke Chinenye Department of Chemical Engineering, Nnamdi Azikiwe University, Awka, Nigeria
  • Madiebo Emeka Michael Department of Chemical Engineering, Nnamdi Azikiwe University, Awka, Nigeria
  • John Chioma Mary Department of Chemical Engineering, Nnamdi Azikiwe University, Awka, Nigeria

Keywords:

kaolin, leaching, iron-oxide impurity, hydrochloric-acid, ANOVA, process modeling

Abstract

The iron-oxide impurity is comparatively abundant in the low-grade kaolin from Inyi in Enugu, Nigeria. The iron-oxide impurities in kaolin make it unsuitable for industrial use. This study focused on the mathematical and statistical process modeling of iron-oxide impurity leaching from Inyi Kaolin by hydrochloric acid (HCl). Response Surface Methodology (RSM) was used to examine the combined effects of leaching temperature, solid-liquid ratio, reaction time, stirring speed, particle size, and acid concentration on the removal of iron contaminant from the local kaolin in HCl. The second-order polynomial regression equation designed with a correlation coefficient R2 of 0.9959 provided the best description for the experimental data. The leaching temperature of 79.99°C, the solid-liquid ratio of 0.021, and the reaction time of the leaching temperature was 79.99°C, the solid-liquid ratio was 0.021, the reaction duration was 240 minutes, the stirring speed was 580.985 rpm, the particle size was 0.045mm, the acid concentration was 3.513mol/cm3, and the yield was at its highest point of 94.35%.

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Published

12-08-2023

Issue

Section

Articles

How to Cite

[1]
J. S. Uzochukwu, O. C. Elijah, O. P. Enyinnaya, N. N. Chinenye, M. E. Michael, and J. C. Mary, “Mathematical and Statistical Process Modeling of Hydrochloric Acid Leaching of Iron-Oxide Impurity from Inyi Kaolin: Response Surface Methodology”, IJMDES, vol. 2, no. 8, pp. 7–14, Aug. 2023, Accessed: May 20, 2024. [Online]. Available: https://journal.ijmdes.com/ijmdes/article/view/168