摘要
以高浓度的白云石精制液为原料,采用碳化法制备高长径比文石型碳酸钙晶须。采用XRD、SEM、TEM等对碳酸钙晶须样品进行表征,主要考察碳化温度、搅拌速率、CO_(2)通气速率、陈化时间对碳酸钙分散程度和长径比的影响。研究结果表明,制备碳酸钙晶须的最佳工艺条件为:碳化温度为80℃,CO_(2)通气速率为25 mL/min,搅拌速率为200 r/min,陈化时间为1 h。在此条件下,可以得到产率为95%、晶须长径比为30~35、晶须含量为99.7%、白度为99.9%且分布均匀的晶须状碳酸钙。并对碳酸钙生长机理进行了分析,结果表明,碳化过程中Mg^(2+)抑制方解石型碳酸钙生长,促进文石型碳酸钙生长,并沿着(120)晶面方向优先生长。
Aragonite calcium carbonate whiskers with a high aspect ratio were prepared by carbonization method using high concentration dolomite refined solution as the raw material.The calcium carbonate whisker samples were characterized by XRD,SEM,TEM,etc.The effects of carbonization temperature,stirring rate,CO_(2) aeration rate,and aging time on the dispersion degree and aspect ratio of calcium carbonate whiskers were investigated.The results show that the optimum process conditions for the preparing calcium carbonate whiskers are as follows:carbonization temperature 80℃,CO_(2) aeration rate 25 mL/min,stirring rate 200 r/min,and aging time 1 h.Under these conditions,calcium carbonate with a yield of 95%,whisker aspect ratio of 30~35,whisker content of 99.7%,whiteness of 99.9%,and uniform distribution can be obtained.The growth mechanism of calcium carbonate was analyzed.The results show that Mg^(2+)can inhibit the growth of calcite calcium carbonate and promote the growth of aragonite calcium carbonate during the carbonization process,and calcium carbonate whiskers have a preferential growth along(120)crystal plane.
作者
于丰
郑强
齐婷玉
张郁柏
马亚丽
贾松岩
李雪
YU Feng;ZHENG Qiang;QI Tingyu;ZHANG Yubai;MA Yali;JIA Songyan;LI Xue(College of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;Liaoning Engineering Research Center for Magnesium and Calcium Inorganic Functional Materials,Shenyang 110142,China;Shenyang Key Laboratory for the Utilization Technology of Magnesium and Calcium Resources,Shenyang 110142,China)
出处
《人工晶体学报》
北大核心
2025年第5期898-908,共11页
Journal of Synthetic Crystals
基金
辽宁省教育厅青年研究项目(JYTQN2023368)
辽宁辽河实验室开放创新基金项目(LLL24KF-02-01)
辽宁省菱镁矿高值利用工程研究中心开放课题(LMKK20240102)。
关键词
白云石
碳酸钙晶须
碳化法
高长径比
晶体生长
dolomite
calcium carbonate whisker
carbonization method
high aspect ratio
crystal growth
