化工学报2016，Vol.67Issue(6)：2449-2455,7.DOI:10.11949/j.issn.0438-1157.20151942
反应结晶过程中二水硫酸钙晶粒性能
Characteristic and structure of calcium sulfate dihydratecrystallites in crystallization process during reaction
窦焰 1刘同海 1沈浩 2郑之银 2刘荣 2崔鹏1
作者信息
- 1. 合肥工业大学化学与化工学院，安徽合肥 230009
- 2. 安徽六国化工股份有限公司，安徽铜陵 244000
- 折叠
摘要
Abstract
In CaHPO4·2H2O-H2SO4-H3PO4-H2O system, an orthogonal experiment with five factors and four levels, including crystallization temperature, SO42− concentration and P2O5 concentration in liquid phase (solution), stirring rate and crystallization time was designed.Based on the measurement of average particle size, the optimized process parameters for the maximum mean particle size are, 80℃ofcrystallization temperature, 50 g·L−1 of SO42−concentration, 260 g·L−1 of P2O5 concentration, 50 r·min−1 of stirring speed, and 2 h of crystallization time. Under the optimum conditions of the crystallization process, by means of analyses on the concentrations of SO42− and P2O5 in solution, and the techniques of XRD, SEM, EDS and laser particle size measurement, it showed that the reaction stage was the first 40 min with a decrease in mean particle size,andafter 40 min, the procedure of crystallization follows the Ostwald grading rules, along with the evolution from CaSO4·0.5H2O to CaSO4·2H2O, but with almost identical particle size.关键词
二水硫酸钙/反应/结晶/制备/过程Key words
calcium sulfate dihydrate/reaction/crystallization/preparation/process分类
化学化工引用本文复制引用
窦焰,刘同海,沈浩,郑之银,刘荣,崔鹏..反应结晶过程中二水硫酸钙晶粒性能[J].化工学报,2016,67(6):2449-2455,7.
