Table 3: Chemical compositions of cement original materials in certain sampling period [1].

Material typeSiO2
(%)
Al2O
(%)
Fe2O
(%)
CaO
(%)
Loss
(%)
Impurity
(%)
Power
(Kwh/ton)
Cost
(¥/ton)

Limestone4.500.990.2445.0040.562.9112.4525.00
Sandstone65.005.761.610.522.628.9012.9415.00
Steel slag17.506.9029.0031.490.3013.4519.8968.00
Shale45.3123.306.108.6310.346.3228.6020.00
Coal ash59.2624.558.073.738.326.0728.6020.00