荧光级高纯氧化铝的制备和应用

Preparation and application of phosphor grade alumina with high purity

以工业低铁级硫酸铝、工业硫酸铵为原料,先制备出高纯的硫酸铝铵,再用碳酸氢铵将它转化成碳酸铝铵,经高温煅烧后可制得纯度高,ω(Al_2O_3)>99.99％,分散性好的氧化铝粉体(D_(50)0.5μm),以该氧化铝为原料,制备的灯用稀土三基色荧光粉,其发光亮度和粉体性能均达到或超过了三基色粉的国家标准。

At first, high purity ammonium aluminium sulfate is prepared by using industrial aluminium sulfate with low iron and the industrial ammonium sulfate. Then it is conversed to ammonium aluminium carbonate by using ammonium hydrogen carbonate. After ammoni- um aluminium carbonate is calcinated at high temperature, an alumina powder with the high purity (>99.99%) and the good dispersion (D_(50) 0.5 μm) can be finally prepared. The glow intensity and property of the rare earth trichromatic phosphors which are prepared by using the alumina can all come up to or surpass the national standard for trichromatic phosphors.