摘要
Active lime was used to produce Ca（OH）2fine powder.And then Ca（OH）2fine powder with analytically pure CeO2fine powder（0,0.2%,0.4%,0.6%,0.8%and1.0%by mass,respectively）were mixed via wet mixing.After drying and ball milling,the specimens were pressed and fired at 1 450℃,1 500℃,1 550℃,1 600℃and1 650℃,respectively.The hydration resistance of the specimens was evaluated by measuring the mass gain after soaking the specimens in a chamber kept at 20℃and90%relative humidity.The influences of CeO2and calcination temperature on the hydration resistance of CaO aggregates were investigated by determination of bulk density,apparent porosity,and XRD,SEM and EDS analysis.The results show that：（1）the sintering of CaO aggregates is promoted by CeO2addition and the hydration resistance of CaO aggregates is improved;（2）CeO2mainly locates in CaO grain boundary,some CeO2is solved in the CaO grains which improves CaO sintering;（3）the appropriate calcination temperature is 1 550℃.When the calcination temperature is below 1 550℃,the specimens are sintered inadequately.The density and hydration resistance of CaO aggregates are nearly stable when the calcination temperature is above 1 550℃.
Active lime was used to produce Ca（OH）2fine powder.And then Ca（OH）2fine powder with analytically pure CeO2fine powder（0,0.2%,0.4%,0.6%,0.8%and1.0%by mass,respectively）were mixed via wet mixing.After drying and ball milling,the specimens were pressed and fired at 1 450℃,1 500℃,1 550℃,1 600℃and1 650℃,respectively.The hydration resistance of the specimens was evaluated by measuring the mass gain after soaking the specimens in a chamber kept at 20℃and90%relative humidity.The influences of CeO2and calcination temperature on the hydration resistance of CaO aggregates were investigated by determination of bulk density,apparent porosity,and XRD,SEM and EDS analysis.The results show that：（1）the sintering of CaO aggregates is promoted by CeO2addition and the hydration resistance of CaO aggregates is improved;（2）CeO2mainly locates in CaO grain boundary,some CeO2is solved in the CaO grains which improves CaO sintering;（3）the appropriate calcination temperature is 1 550℃.When the calcination temperature is below 1 550℃,the specimens are sintered inadequately.The density and hydration resistance of CaO aggregates are nearly stable when the calcination temperature is above 1 550℃.
