experimental investigation of energy consumption and co2 emission in cement kiln in effect of replacement natural pozzolan by method of grinding clinker and pozzolan separately

In this research, natural pozzolanic materials were used in cement production to reduce the emission of co2 and energy consumption. the rate of substitution of cement with natural pozzolan powder varied from 20% to 50% in 100 samples. compressive strength tests were carried out on mortar specimens (4×4×16 cm3) after 2, 7, and 28 days. the obtained activity index was approximately 85% and volcanic ash was pozzolan. the compressive strength values changed from 122 to 318 kg/cm2 after 7 days and from 201 to 433 kg/cm2 after 28 days. however, the reduction of co2 emission with 20% to 50% of additive amounted from 130.74 tons to 419.32 tons of co2 per ton of clinker. by using 3 to 53% of additives, electricity consumption decreases from 1.89 to 33.39 kwh per ton of clinker. moreover, this amount of additive can raise energy savings from 99160.8 to 1751841.8 kj per ton of clinker.