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

Soliman Younes Gajam, Srini Raghavan

Research output: Contribution to journalArticle

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 languageEnglish (US)
Pages (from-to)143-158
Number of pages16
JournalHydrometallurgy
Volume15
Issue number2
DOIs
StatePublished - Dec 1985

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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