EFFECT OF SILICA ON THE CRYSTALLIZATION OF SODIUM PERBORATE TETRAHYDRATE

Effects of SiO2 additive on sodium perborate tetrahydrate crystallizat ion (via chemical reaction of NaBO2 and H2O2) has been studied in a MS MPR-type reaction crystallizer. CSD and microscopic observations are u sed to evaluate the secondary nucleation behaviour. Secondary nucleati on rate decreases in case of SiO2 addition of up to 200 ppm. Higher Si O2 content results in higher primary nucleation rates. Abrasion resist ance increases with the amount of SiO2 additive.