Analysis of Particle Size Control in the Preparation of Nano-size CaCO_3 Particles  

作　　者：曹维良 王泽 张敬畅 

机构地区：[1]College of Science, Beijing University of Chemical Technology Beijing 100029, China

出　　处：《Chinese Journal of Chemical Engineering》2003年第5期589-593,共5页中国化学工程学报（英文版）

摘　　要：Cubic shaped CaCO3 particles with mean size of 30-40nm were prepared by intermittent carbonation process without any additives. It was found that the flow rate of CO2 has no distinct influence on the particle size in the range of 30 120ml·min^-1 under conditions of 13℃ and stirring rate of 680r·min^-1. A further increase of flow rate makes the particles larger. When CO2 flow rate is 70ml·min^-1, a high agitation rate is in favor of the reduction of the crystal size in the range of 70-680 r·min^-1. When flow rate is 120 ml·min^-1, the particles prepared at agitation rates of 680r·min^-1 and 280r·min^-1 have similar sizes, while products prepared at 90r·min^-1 have larger size.Cubic shaped CaCO3 particles with mean size of 30-40 nm were prepared by intermittent carbonation process without any additives. It was found that the flow rate of CO2 has no distinct influence on the particle size in the range of 30-120ml·min-1 under conditions of 13℃ and stirring rate of 680r·min-1. A further increase of flow rate makes the particles larger. When CO2 flow rate is 70ml·min-1, a high agitation rate is in favor of the reduction of the crystal size in the range of 70-680 r·min-1. When flow rate is 120 ml·min-1, the particles prepared at agitation rates of 680r·min-1 and 280r·min-1 have similar sizes, while products prepared at 90r·min-1 have larger size.

关 键 词：nano-size CaCO3 ANALYSIS number of growth unit AGGLOMERATION 

分 类 号：O611[理学—无机化学]