Jul 03, 2018· Secondly, the CaCO 3 and TiO 2 slurries were mixed together and ground by a GSDM-S3 type ultrafine grinding mill (3 L, Beijing gosdel power&technology Co. Ltd., Beijing, China) with a speed of 1200 r/min and the weight ratio of ball to powder was 4:1. After stirring at room temperature and pH = 8 for 90 min, the composite slurry was obtained.
