合成超细CaCO3的非稳态碳化反应特征和颗粒形态
来源期刊:中国有色金属学报2000年第3期
论文作者:林荣毅 张培新 张家芸
文章页码:444 - 448
关键词:超细CaCO3; Na5P3O10; 碳化特征
Key words:CaCO3 ultrafine particle;Na5P3O10; carbonation characteristics; Ca(OH) 2
摘 要:在合成超微细CaCO3的非稳态体系中,跟踪测定了Ca(OH) 2悬浮液在有添加剂Na5P3O10存在时的碳化过程。研究表明,在Ca(OH) 2悬浮液中加入(0.380 4~1.522)×10-4mol/L Na5P3O10就足以抑制Ca(OH) 2碳化反应的进行。 随着溶液中Na5P3O10浓度的增加,碳化反应速度减小。 Ca(OH) 2的碳化过程可分为两个阶段, 即反应初期的恒速反应阶段和反应末期的变速反应阶段。
Abstract: The carbonation of Ca(OH) 2 suspension in the presence of Na5P3O10 was measured in situ using conductivity gauge, pH meter, chemical analysis, and the reaction products were analyzed using SEM. The result showed that the carbonation can be divided into two stages, i.e. a constant rate stage and a falling rate stage. The presence of Na5P3O10 can obviously inhabit the Ca(OH) 2carbonation rate and CaCO3 growth rate.