This improvement was attributed to the change in the minerals constitution ratios in the blends due to the increase in their calcite contents after El Masakheet addition, especially the Ca/Si and Ca/(Al + Si) atom ratios. In addition, a notable increase in their open porosity was recorded. Results showed that by blending El-Masakheet sample with 50% mass ratio with Kasr El-Sagha or Demia yellow samples, a pronounced increase in the thermal applicability of the fired blends from 900 to 1100 ☌ was achieved. The physical properties of the fired mixed specimens were followed up. The specimens were subjected to firing at different temperatures for 1 h. Different amounts of El-Masakheet sample was blended with Kasr El-Sagha and Demia yellow samples. By firing the dried Kasr El Sagha and Demia yellow samples specimens at different temperatures for 1 h, they showed complete destruction at 900 ☌. In addition, Kasr El-Sagha and Demia samples were of high-grade diatomite with minor calcite contents. The analyses showed that El-Masakheet sample was of low-grade diatomite with excess calcite content. Complete chemical and phase analyses of these samples were carried out. In this respect, three diatomite samples were collected for investigation from El-Masakheet, Kasr El-Sagha, and Demia deposits, El-Fayoum, Egypt. The idea of mixing different grades of diatomite ores with certain ratios to obtain blends with tailored minerals constitution that can help on improving their thermal insulation applicability is introduced in this study.
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