低温碳化法制备高分散性纳米碳酸钙的研究  

Preparation of Highly Dispersed Nano Calcium Carbonate by Low-Temperature Carbonization Method

作　　者：邢佳斌 李威 贾松岩 马亚丽 李雪 郑强 XING Jiabin;LI Wei;JIA Songyan;MA Yali;LI Xue;ZHENG Qiang(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)

机构地区：[1]沈阳化工大学化学工程学院,沈阳110142 [2]辽宁省镁钙无机功能材料工程研究中心,沈阳110142 [3]沈阳市镁钙资源利用技术重点实验室,沈阳110142

出　　处：《人工晶体学报》2024年第5期864-872,共9页Journal of Synthetic Crystals

基　　金：辽宁省教育厅青年研究项目(JYTQN2023368);2020—2022年辽宁省普通本科高等学校校际合作项目(辽教发[2020]28号文件);2021—2023年辽宁省科技厅创新能力提升联合基金(2021-NLTS-12-04)。

摘　　要：以石灰石为原料,采用低温碳化法制备了高分散性纳米碳酸钙。通过XRD、SEM、TEM等对纳米碳酸钙样品进行表征,考察了浆料比、碳化温度、CO_(2)通气速率、陈化时间、晶型控制剂对纳米碳酸钙粒径和分散程度的影响。研究结果表明,制备纳米碳酸钙的最佳工艺条件为:浆料比为5%,碳化温度为15℃,CO_(2)通气速率为200 mL/min,陈化时间2 h,并选用ZnCl_(2)为添加剂。在此条件下,制得晶粒尺寸为25~35 nm、分布均匀的立方体状纳米碳酸钙。结合Materials Studio对纳米碳酸钙的生长机理进行了分析,结果表明:碳酸钙的(104)和(116)2个晶面具有热力学稳定性,最终会成为顽强显露的晶面,促使生成立方体型纳米碳酸钙。Highly dispersed nano calcium carbonate was prepared using limestone as raw material by low-temperature carbonization method.The nano calcium carbonate samples were characterized by XRD,SEM,TEM,etc.The effects of slurry ratio,carbonization temperature,CO_(2) aeration rate,aging time,and crystal control agent on the particle size and dispersion degree of nano calcium carbonate were investigated.The process conditions for preparing nano calcium carbonate were obtained as follows:slurry ratio of 5%,carbonization temperature of 15℃,CO_(2) aeration rate of 200 mL/min,aging time of 2 h,and ZnCl_(2) as the crystal control agent.Under these conditions,cubic nano calcium carbonate with a grain size of 25~35 nm and uniform distribution was prepared.The growth mechanism of nano calcium carbonate was analyzed by Materials Studio.The results show that the(104)and(116)crystal planes of calcium carbonate were thermodynamically stable and would eventually become tenacious exposed crystal planes,which promots the generation of cubic nano calcium carbonate.

关 键 词：石灰石 纳米碳酸钙 低温碳化法 晶体生长 生长机理 晶型控制剂 

分 类 号：TQ132.32[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程]