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Table 3 Chemical composition of fired M2-K2 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 68.90 64.86 58.55 54.23 49.63
Al2O3 11.00 10.44 9.58 8.99 8.36
Fe2O3 8.35 8.08 7.66 7.37 7.06
MnO 0.03 0.03 0.04 0.05 0.05
MgO 1.25 1.33 1.46 1.56 1.65
CaO 5.72 10.52 18.01 23.24 28.60
Na2O 0.94 0.98 1.05 1.09 1.14
K2O 1.13 1.08 1.01 0.96 0.91
TiO2 0.97 0.95 0.91 0.88 0.85
Ca/Si 0.58
Ca/Al + Si 0.49
Al/Al + Si 0.16
Ca/Si + Mg 0.55