Abstract
The work presented here is an investigation into the possibility of using marlstones as ceramic raw material. These marlstones are the only abundant clay minerals available in the area investigated, although they contain appreciable amounts of carbonates. To beneficiate the marlstone, it was treated chemically to reduce the carbonate content, and the effect of parameters such as the degree of carbonate removal, firing programme, percentage of soluble salts and percentage of free silica on the ceramic properties of the treated marlstone were studied. The results were compared with those obtained from an industrial clay used in the production of tiles. The results showed that the unglazed wall tiles produced from the beneficiated marlstone complied with international standard specifications for wall tiles.
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