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Several mining companies are currently exploiting the sodium feldspar deposits in central Sardinia. The albitite occurs in veins and lenses of metasomatic origin hosted by Hercynian granites. Composition of the albitites varies significantly from pure albitites to quartz-rich to chlorite-rich to andesine-oligoclase, to potassium albitites. Because of compositional variability within the same deposit the mineral is selectively mined. The mineral bodies are first sampled and characterized by means of chemical-mineralogic determinations conducted in on-site laboratories. The mineral and waste rock are extracted separately from the extensive and numerous working faces producing a variety of feldspar materials to satisfy the diversified market demand. The raw materials are employed mainly in the manufacture of floor tiles (porcelain stoneware and single-fired) and sanitary-ware but some of it is exported.
The feasibility was studied of using an infrared gauge for on-line measurement of tile body moisture content after pressing. The infrared gauge was shown to enable monitoring the evolution of moisture content in ceramic tile bodies formed by pressing under different conditions. The results confirm the usefulness of the system for avoiding defects of dimensional stability (calibers or size inconsistency) in the finished product, and the possibility of using the system for automatic control of the pressing operation.
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