Diatomaceous Moler Heart Insulation Materials

Diatomaceous earth is a silica reach porous fossil rock refuse of light gray, light yellow, and light pink color, formed by shells of diatomaceous weed. The shells were deposited on the bottom of water reservoirs, and mud clay between these shells cements the deposits. Diatomaceous ore exists on all continents probably the most famous is in Denmark (Fig. 2.83). 

In good diatomaceous ore, there is more that 70 % silica. Due to the small pore dimensions (pore diameter 5-100 pm), diatomaceous materials have low thermal conductivity. 

Clay minerals, which are part of diatomaceous ores, determine the plasticity at shaping, the sintering process, and the service temperature. Probably the three main variables in diatomaceous ores are the nature (and dimensions) of diatomaceous shells, the nature of clay minerals, and the ratio of diatomaceous shells to clay minerals [205, 206]. These variables vary from deposit to deposit, so the properties of diatomaceous bricks from different deposits differ. 

The possible defects are only dimensional tolerances and cavities (in case of slurry processing), but it is necessary to keep in mind the safe service temperature (Fig. 2.88). In large part the safe service temperature is determined by the clay 

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