Abstract
The physico-thermal properties of kaolinised rocks occurring at the Northern part of Mulieh village of Jaintia Hills, Meghalaya were studied with a view to find out its possible use in ceramic industry. The study was conducted on the crude as well as washed fractions of Grade I and Grade II clays obtained by systematic levigation. The investigation included the determination of unfired physical properties of all the three fractions of the clay leading to the suitability in ceramic industry. The PCE values and the fired characteristics at six different temperatures starting from 1200° to 1450°C at the interval of 50°C of all the three levigated fractions of the clay were determined. The results indicated that the crude clay being non-slaking in nature and contained about 68% residual fraction required proper processing for using it successfully in producing ceramic articles. Grade I clay when mixed with other ceramic raw materials in right proportions may prove promising in the manufacture of ceramic whiteware products except, of course, porcelain crockery due to the off-white fired colour. On the other hand, Grade II fraction which the industry may find useful if formulated judiciously considering the physico-chemical properties of the clay.
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