Recovery of aluminium oxide from flint clay through H2SO4 leaching

Angus L. Daniels, Edison Muzenda, Mohamed Belaid, Freeman Ntuli

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This is a short communication on the work done to recover aluminium oxide from waste produced by a fertilizer manufacturing company in South Africa. Aluminium rich ore (known as flint clay) was subjected to an experimental study in which aluminium oxide (Al2O3) was recovered through acid leaching. Sulphuric acid was the leaching agent due to its suitability for leaching aluminium and other base metals. The following phases were present in the sample (Al2O3), magnetite (Fe2O3), silica (SiO2) and as well as other metal compounds in concentrations of less than 2%. Parameters investigated were, leaching time, acid concentration, solid to liquid ratio and leaching temperature. The maximum Al recovery was 69%. The optimum conditions found in this study were leaching time of 4 hours, acid ratio of 1:4, leaching temperature of 1000C and solid to liquid ratio of 1:6.

Original languageEnglish
Title of host publicationProceedings of the World Congress on Engineering 2012, WCE 2012
EditorsA. M. Korsunsky, Len Gelman, Andrew Hunter, S. I. Ao, David WL Hukins
PublisherNewswood Limited
Number of pages3
ISBN (Print)9789881925220
Publication statusPublished - 2012
Externally publishedYes
Event2012 World Congress on Engineering, WCE 2012 - London, United Kingdom
Duration: Jul 4 2012Jul 6 2012

Publication series

NameLecture Notes in Engineering and Computer Science
ISSN (Print)2078-0958


Conference2012 World Congress on Engineering, WCE 2012
Country/TerritoryUnited Kingdom

All Science Journal Classification (ASJC) codes

  • Computer Science (miscellaneous)


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