Study On Interaction Of The Main Components Of Cement Raw Meal At The Atmosphere Of O₂/CO₂ In Cement Precalciner Kiln System

China has become the world’s largest producer of cement. Cement production accounted for 59.3% of world output in 2014.Achieved CO2 emission reduction in cement industry is imminent. CO2 in flue gas of Cement production is high.The O2/CO2 combustion technology applied in cement production is effective and feasible.It will greatly reduce the cost.But changed the atmosphere will affect the raw material decomposition and operating parameters in precalcinor.Therefore, it is necessary to study the synergies of the main component of cement raw material and ingredients CaCO₃, SiO2, Al₂O₃ and Fe₂O₃ in precalcinor.This paper using thermogravimetric analyzer and suspension experiment platform to study the decomposition characteristics and kinetics parameters of CaCO₃ and other raw cement ingredients SiO2, Al₂O₃ and Fe₂O₃ under non-isothermal and isothermalconditions.Compared study shows that Compared to air atmosphere O2/CO2 atmosphere suppress the decomposition of CaCO₃ under the condition oftwo kinds of temperature. Under non-isothermal conditions, the decomposition temperature of CaCO₃ was significantly improved.And under the isothermalconditions,the decomposition time of CaCO₃ was significantly prolonged.This is becausethe high CO2 partial pressurehindered thediffusion of CO2.Under the two temperatures and two atmospheres,decomposition mechanismmodel of pure CaCO₃ are biased towards the random nucleation and subsequent growth model.According to some studies of CaCO₃ crystal,the decomposition reaction of CaCO₃ crystalis tend to point to the surface.Under the condition of two kinds of temperature,decomposition of CaCO₃ in airatmosphere is affected minimal.While in O2/CO2 atmosphere,several kinds of oxides are has certain inhibitory effect for the decomposition of CaCO₃.The possible reason is that it generated the intermediate product during the high temperature reaction process.They clogged pores andinhibited the decomposition of CaCO₃.Under the condition of two kinds of temperature, the influence degrees of three ingredients haveslightly different.In non-isothermal condition, the influence of size is: Al₂O₃> SiO2> Fe₂O₃. And under the condition of isothermal, the influence of Al₂O₃ and SiO2 is basically same, but both greater than Fe₂O₃.This is decisiedby the reaction temperature and generate types of the intermediate, and heating rate.