Effect of silica on the crystallization of sodium perborate tetrahydrate

Abstract

Abstract Effects of SiO 2 additive on sodium perborate tetrahydrate crystallization (via chemical reaction of NaBO 2 and H 2 O 2 ) has been studied in a MSMPR-type reaction crystallizer. CSD and microscopic observations are used to evaluate the secondary nucleation behaviour. Secondary nucleation rate decreases in case of SiO 2 addition of up to 200 ppm. Higher SiO 2 content results in higher primary nucleation rates. Abrasion resistance increases with the amount of SiO 2 additive.