... weight ratio, stirring edge dosing, to complet Specifications of Spray dried process: AppearanceLight yellow powderRelative density(20 )---AL2O3, %,≥30.029.028 ... .00001---Pb,%, ≤0.001---Cd,%, ≤ 0.0002--- Specifications of Roller dried process: AppearanceLight yellow powderRelative density( 20 )-AL 2 O 3 ...