首页|低温碳化法制备高分散性纳米碳酸钙的研究

低温碳化法制备高分散性纳米碳酸钙的研究

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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、CO2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 ℃,CO2通气速率为200 mL/min,陈化时间2 h,并选用ZnCl2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.
Preparation of Highly Dispersed Nano Calcium Carbonate by Low-Temperature Carbonization Method
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,CO2 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 ℃,CO2 aeration rate of 200 mL/min,aging time of 2 h,and ZnCl2 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.

limestonenano calcium carbonatelow-temperature carbonizationcrystal growthgrowth mechanismcrystalline controlling agent

邢佳斌、李威、贾松岩、马亚丽、李雪、郑强

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沈阳化工大学化学工程学院,沈阳 110142

辽宁省镁钙无机功能材料工程研究中心,沈阳 110142

沈阳市镁钙资源利用技术重点实验室,沈阳 110142

石灰石 纳米碳酸钙 低温碳化法 品体生长 生长机理 晶型控制剂

辽宁省教育厅青年研究项目辽宁省普通本科高等学校校际合作项目(2020-2022)辽宁省科技厅创新能力提升联合基金(2021-2023)

JYTQN2023368辽教发[2020]28号文件2021-NLTS-12-04

2024

人工晶体学报
中材人工晶体研究院

人工晶体学报

CSTPCD北大核心
影响因子：0.554
ISSN：1000-985X
年,卷(期)：2024.53(5)
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