... .10---Cr 6+ ,%, ≤0.0005---Hg,%, ≤0.00001---Pb,%, ≤0.001---Cd,%, ≤0.0002--- Specifications of Roller dried process: AppearanceLight yellow powderRelative ... .10- Cr 6+ ,%, ≤0.0005- Hg,%, ≤0.00001- Pb,%, ≤0.001- Cd,%, ≤0.0002- Dosage: River water (ppm)Industry circulation water (ppm ...