The kaolin content rarely exceeds 50% of the altered granite, but the depth of kaolinization often extends down to 900 ft. The kaolin deposits of Cornwall and Devon (UK) are typical of primary deposits, and, along with the primary deposits of France and Germany, represent the source of the majority of North American imported primary clays. Table 1.
The resulted showed that plastered brick waste and tile waste can be used to produce good quality brick for various engineering applications in construction and building. The replacement of brick clay by plastered brick waste and tile waste at the levels of 30% has good effects on the compressive strength of the bricks.
For example, the dissolving ratio of iron was in a muffle furnace for 4 h. The roasted solid was ground lower than nickel, but the concentration of iron ions was and leached with de-ionised water at 80 °C, a solid to liquid about 2.46 g/L, which is about 15 times of nickel.