As stated earlier, the best blue clay for tiles is generally found beneath brick earth. Impurities such as grit, pebbles, etc. are removed from the selected clay. The clay is ground into a powder form in crushing roller mills. It is then pugged.
For the preparation of superior tiles, the powdered clay is mixed with water in a tank and allowed to settle down. The coarser particles settle down, and the solution containing the finer particles is run off into a lower tank. The collected material in the lower tank is allowed to dry leaving the fine clay ready for further processing.
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