Synthesis of high alumina refractories from lithomargic clay

Anthony Andrews, Elsie Nsiah-Baafi, Simon K.Y. Gawu, Peter A. Olubambi

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Lithomargic clay underlying Awaso bauxite deposits consists mainly of kaolinite and minor fractions of gibbsite. Gibbsite, useful as a source of alumina, was separated from kaolinite. Gibbsite was added to lithomargic clay in various amounts, using Mfensi clay as a binder, and fired at 1350 oC for 2 h. Linear firing shrinkage, density, porosity, water absorption and cold crushing strength were used to characterize the fired bricks. The mineralogical compositions in the fired bricks were analyzed by X-ray diffraction techniques. The results showed that increasing the gibbsite amount up to 40 wt% increased the firing shrinkage and density whilst the apparent porosity and water absorption values decreased. Increasing the gibbsite amount enhanced mullite and corundum formation whilst the formation of free-silica phases was inhibited. The cold crushing strength increased linearly with increasing gibbsite content.

Original languageEnglish
Pages (from-to)6071-6075
Number of pages5
JournalCeramics International
Issue number4
Publication statusPublished - May 2014
Externally publishedYes


  • Gibbsite
  • High alumina refractories
  • Kaolinite
  • Lithomargic clay

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry


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