Investigation on characteristics of calcination and sintering of limestone in O2/Co2 atmosphere

The calcination and sintering of limestone in O2/CO2 atmosphere were investigated. The results show that the specific surface area and the porosity of CaO calcined in air are bigger than those in O2/CO2 atmosphere, but the latter has bigger average pore radius and surface area than the former. The peaks of the specific surface area and the porosity of CaO calcined in O2/CO2 atmosphere appear at 1000°C. They decrease with increase in CO2 concentration, drop rapidly in low CO2 concentration, but slowly in high CO2 concentration. When increasing the same sintering time, the effect of sintering on the pore structure is less strong in O2/CO2 atmosphere than in air.