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

Preparation of High Infrared Reflective Chromic Oxide Green Pigment from Potassium Chromate by Hydrogen Reduction Calcination

以K2CrO4为原料,通过氢还原固相煅烧法制备了体积平均粒径为3.991m的Cr2O3绿颜料,考察了中间产物粗料CrOOH和细料Cr(OH)3及煅烧过程中煅烧温度、添加剂P2O5和TiO2对红外反射率的影响.结果表明,CrOOH煅烧所得Cr2O3的反射率较高,且随温度升高,红外反射率呈先升高后降低的规律,在最佳煅烧温度1150℃时达60%;在该温度下,通过添加P2O5和TiO2在高温下煅烧,Cr2O3绿颜料的红外反射率提高到70%,产物中出现了KCrPO7和(Cr,Ti)2O3新相,促进了红外反射率的提高.

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 1 150 ℃, 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.