Cement Kilns

Enthalpy of Formation Data


Standard enthalpies of formation are required in order to calculate the enthalpies of key reactions in cement kilns, and to calculate overall theoretical energy requirements. The values of standard enthalpy of formation from the elements in their standard states are in kJ/mol, in the standard state 298.15 K and 101325 Pa.


Phase Formula Molar Mass ΔfH° kJ/mol
Quartz SiO2 60.0843 -910.86
Kaolinite Si2Al2O5(OH)4 258.1606 -4120.40
Pyrophyllite Si2AlO5(OH) 180.1569 -2821.10
Hematite Fe2O3 159.6882 -825.48
Calcite CaCO3 100.0872 -1206.92
Dolomite CaMg(CO3)2 184.4019 -2330.09
Phlogopite KMg3AlSi3O12(OH)2 417.2616 -6075.22
Water (l) H2O 18.0153 -285.830
Water (g) H2O 18.0153 -241.826
Carbon Monoxide CO 28.0104 -110.530
Carbon Dioxide CO2 44.0098 -393.520
Albite NaSi3AlO8 262.2230 -3948.30
Orthoclase KSi3AlO8 278.3315 -3921.20
Ilmenite FeTiO3 151.7102 -1234.08
Hydroxyapatite Ca5(PO4)3(OH) 502.3115 -6752.00
Bixbyite Mn2O3 157.8743 -956.90
Lime CaO 56.0774 -635.09
Periclase MgO 40.3049 -601.25
Tricalcium silicate Ca3SiO5 228.3165 -2929.20
Dicalcium silicate Ca2SiO4 172.2391 -2307.50
Tricalcium aluminate Ca3Al2O6 270.1935 -3588.60
Tetracalcium aluminoferrite Ca4Al2Fe2O10 485.9591 -5092.89
Forsterite Mg2SiO4 140.6941 -2176.93
Sulfur Dioxide SO2 64.0663 -296.82
Thenardite Na2SO4 142.0446 -1387.58
Arcanite K2SO4 174.2617 -1437.71
Anhydrite CaSO4 136.1431 -1425.22
Sodium aluminate Na2Al2O4 163.9402 -2268.50
Potassium aluminate K2Al2O4 196.1573 -2281.10
"Tetracalcium magnesotitanite" Ca4Mg2Ti2O10 464.6760 -5669.00
Whitlockite Ca3(PO4)2 310.1767 -4120.80
Tetracalcium aluminomanganite Ca4Al2Mn2O10 484.1451 -5223.00

© Dylan Moore 2011: commenced 30/12/2011: last edit 25/01/2017.

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