化工学报Issue(10)：4007-4015,9.DOI:10.11949/j.issn.0438-1157.20150373
反应-萃取-结晶过程制备碳酸钙的晶型转变与结晶机理
Polymorph transformation and formation mechanism of calcium carbonate during reactive extraction-crystallization process
摘要
Abstract
Distiller waste produced in ammonia-soda process restricts the development of soda industry. In this study, the polymorph transformation and crystallization mechanism of calcium carbonate in the reactive extraction-crystallization coupled process were investigated. The results show that carbon dioxide (CO2) is first absorbed by the organic phase and then transferred to the aqueous phase. Calcium bicarbonate is generated and then decomposed into amorphous calcium carbonate rapidly. Temperature has a significant effect on the polymorph of calcium carbonate. Needle-like aragonite forms preferentially at higher temperatures and spherical and flower-like vaterite forms preferentially at lower temperatures. Both of them will finally transform into rhombic calcite by dissolution and recrystallization. At 20℃, the formation of new vaterite and its transformation to calcite occur simultaneously in the coupled process. The content of vaterite in the particles increases with the increase of CO2 concentration.关键词
废物处理/结晶/碳酸钙/晶型转变/溶剂萃取Key words
waste treatment/crystallization/calcium carbonate/polymorph transformation/solvent extraction分类
化学化工引用本文复制引用
李云钊,宋兴福,孙玉柱,孙泽,于建国..反应-萃取-结晶过程制备碳酸钙的晶型转变与结晶机理[J].化工学报,2015,(10):4007-4015,9.基金项目
国家高技术研究发展计划项目（2011AA06A107）。@@@@supported by the National High Technology Research and Development Program of China (2011AA06A107) （2011AA06A107）
