摘要
采用 pH计和电导率仪对Ca(OH) 2 H2 O CO2 系统合成纳米碳酸钙反应过程跟踪检测 ,结果表明 ,对质量分数为 2 %～ 1 0 %的Ca(OH) 2 悬浊液 ,温度为 1 6～ 30℃时 ,碳化反应前期速率受CO2 吸收控制 ,反应末期受Ca(OH) 2 溶解控制 ;温度为 1 2℃时 ,在碳化反应前期电导率第一次下降回复过程中 ,碳化反应速率受Ca(OH) 2 溶解控制·产品粒度随Ca(OH ) 2 悬浊液温度和质量分数的升高而增大 ,温度为 1 2～ 2 5℃ ,质量分数为 2 %～ 8%时 ,可制得纳米CaCO3 颗粒·电导率曲线的第一次下降回复与CaCO3 产品的粒度存在着对应关系 ,下降幅度越大 ,产品粒度越细·
The synthesis of nanoparticles of calcium carbonate in the reaction system Ca(OH) 2 H 2O CO 2 was measured in situ by using conductivity gauge and pH meter, with the lime suspension mass fraction of 2%～10% and temperature of 12～30?℃. At the temperature of 16～25?℃, the carbonation rate is controlled by the absorption of CO 2 at the initial period and finally it turns to be controlled by dissolution of Ca(OH) 2. At the temperature of 12?℃, different from that of the higher temperature, the carbonation rate is controlled by dissolution of Ca(OH) 2 during the first declining and regressing stage of conductivity curve. The particle size of the product is increased with the increase of the temperature and mass fraction of the Ca(OH) 2 suspension, and the nanoparticles of CaCO 3 is produced at the temperature of 12～25?℃ and with the lime suspension mass fraction of 2%～8%. A certain relationship between the first surge of conductivity curve and the particle size of the product was found, the bigger the first surge, the smaller the particle size.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2000年第2期169-172,共4页
Journal of Northeastern University(Natural Science)
基金
河北省科委计划项目! ( 9910 90 3 4 3 )
关键词
碳酸钙
纳米颗粒
结晶过程
成核
生长
合成
calcium carbonate
nanoparticles
crystallization
nucleation
growth
