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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 pH value and conductivity meter were used to measure the reaction process of CaCO3 nanoparticles in Ca (OH) 2 H2 O CO2 system. The results showed that Ca (OH) 2 suspension with mass fraction of 2% ~ 10% When the temperature is 16 ~ 30 ℃, the rate of carbonation reaction is controlled by CO2 absorption and the reaction is controlled by Ca (OH) 2 dissolution at the early stage of carbonization. When the temperature is 12 ℃, The reaction rate is controlled by the dissolution of Ca (OH) 2. The particle size of the product increases with the increase of temperature and mass fraction of Ca (OH) 2 suspension, the temperature is 1-25 ℃ and the mass fraction is 2-8% , The nano-CaCO3 particles can be obtained. The first drop of the conductivity curve has a corresponding relationship with the particle size of the CaCO3 product. The larger the drop, the finer the product size