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Table 4 Chemical composition of different mixtures of M2-D2 diatomite specimens after firing at 1100 °C for 1 h

From: To blend is a good solution to improve the heat insulation applicability of diatomite ores

Constituent, % M2 addition by mass%
5 15 30 40 50
SiO2 65.77 62.15 56.70 52.44 48.27
Al2O3 10.94 10.41 9.62 9.00 8.39
Fe2O3 6.78 6.66 6.49 6.33 6.19
MnO 0.04 0.05 0.05 0.059 0.06
MgO 1.76 1.80 1.86 1.89 1.93
CaO 10.35 14.57 21.31 25.88 30.75
Na2O 0.55 0.63 0.75 0.82 0.91
K2O 1.22 1.16 1.09 1.02 0.96
TiO2 0.89 0.87 0.85 0.83 0.80
Ca/Si 0.68
Ca/Al + Si 0.57
Al/Al + Si 0.17
Ca/Si + Mg 0.64