Preparation of High Infrared Reflective Chromic Oxide Green Pigment from Potassium Chromate by Hydrogen Reduction Calcination
铬酸钾氢还原固相煅烧法制备高红外反射率氧化铬绿颜料

A high infrared reflective chromium oxide green pigment was prepared by a hydrogen reduction calcination method.The maximum reflectance of Cr2O3 reached 70%.The influential factors on the reflectance such as reduction product,CrOOH,Cr(OH)3,temperature,and dopants TiO2 and P2O5 were studied.It was found that the reflectivity of Cr2O3 was improved by the calcination temperature and doping of TiO2 and P2O5.When the calcination temperature reached 1150℃,the reflectance of Cr2O3 was 60%,at this temperature,the reflectance reached 70% when the Cr2O3 was doped with P2O5 and TiO2 under the enhancement of KCrPO7 and(Cr,Ti)2O3 phase formation.