摘要
利用在加有ＭｇＣｌ２ 的石灰乳悬浊液中进行碳酸化的方法，合成了文石ＣａＣＯ３ 晶须，晶须直径在１ ～２ μｍ ，长径比在１０ ～４０ 之间．详细研究了ＭｇＣｌ２ 的浓度、悬浊液初始ｐＨ 值、反应温度及搅拌速度等工艺条件对沉淀ＣａＣＯ３ 晶型的影响，并初步探讨了ＣａＯ 的活性对文石晶须形态习性的影响．利用Ｘ 衍射分析手段对沉淀ＣａＣＯ３ 晶型进行了定量测定．实验表明：在悬浊液初始ｐＨ 值为９ 左右，反应温度为６０ ℃以上及搅拌速度为２４０ ｒ／ｍｉｎ 的条件下，可制备出均一的文石ＣａＣＯ３
Aragonite calcium carbonate whisker was synthesized by introducing carbon dioxide into Ca(OH) 2 suspension mixed with MgCl 2. Examined are the effects of concentration of MgCl 2,pH value of initial suspension, reaction temperature and stirring rate on calcium carbonate polymorphs. The results show that magnesium ion act as an inhibitor for the calcite phase, and the aragonite whisker can be prepared for pH equa l9,and at temperatare over 60 ℃with a suitable stirring rate. X ray diffraction was used to identify the phase composition of precipitated calcium carbonate. Morphology and microstructure of whisker were examined using scanning electron microscopy. The final crystal has a high aspect ration ranging from 10 to 40;it can be influenced by the activity of calcium oxide.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
1999年第12期17-20,共4页
Journal of Xi'an Jiaotong University
基金
西安交通大学博士点论文基金
关键词
文石
晶须
碳酸化
合成
碳酸钙
晶型
calcium carbonate
aragonite
whisker
carbonate process
