Use of mottled clay in the manufacture of grog refractories based on Vladimirovka kaolin

This paper sums up a study into the effect of mottled clay on the density of a grog—kaolin mix in pressing and firing. It is shown inadvisable to use coarse-ground mottled clay in the sintering of specimens. The clay was found to produce the best effect when added to the product batch as a fine co-ground mixture with grog or as a slip. The main process variables are given for the manufacture of critical grog refractories with mottled clay as the sintering agent.