A kinetic model for the hydrochloric acid leaching of kaolinite clay in the presence of fluoride ions

Soliman Younes Gajam; Srini Raghavan

doi:10.1016/0304-386X(85)90050-7

A kinetic model for the hydrochloric acid leaching of kaolinite clay in the presence of fluoride ions

Soliman Younes Gajam, Srini Raghavan

Materials Science and Engineering

Research output: Contribution to journal › Article

14 Scopus citations

Abstract

The dissolution of kaolinite clay in hydrochloric acid solutions has been carried out in the presence of fluoride ions. Leaching in the presence of fluoride ions activates the clay for leaching, making higher extractions possible at lower roasting and leaching temperatures. The activation energy for the leaching of clay calcined at 540°C is decreased from 71 kJ/mol to 23 kJ/mol in the presence of fluoride ions. Dissolution in the presence of fluoride appears to fit a second-order reaction mechanism.

Original language	English (US)
Pages (from-to)	143-158
Number of pages	16
Journal	Hydrometallurgy
Volume	15
Issue number	2
DOIs	https://doi.org/10.1016/0304-386X(85)90050-7
State	Published - Dec 1985

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ASJC Scopus subject areas

Industrial and Manufacturing Engineering
Metals and Alloys
Materials Chemistry

Cite this

Gajam, S. Y., & Raghavan, S. (1985). A kinetic model for the hydrochloric acid leaching of kaolinite clay in the presence of fluoride ions. Hydrometallurgy, 15(2), 143-158. https://doi.org/10.1016/0304-386X(85)90050-7

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AB - The dissolution of kaolinite clay in hydrochloric acid solutions has been carried out in the presence of fluoride ions. Leaching in the presence of fluoride ions activates the clay for leaching, making higher extractions possible at lower roasting and leaching temperatures. The activation energy for the leaching of clay calcined at 540°C is decreased from 71 kJ/mol to 23 kJ/mol in the presence of fluoride ions. Dissolution in the presence of fluoride appears to fit a second-order reaction mechanism.

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10.1016/0304-386X(85)90050-7