摘要
本文研究了水化铝酸钙、水化硫铝酸钙的碳化性能。实验结果表明,高硫型水化硫铝酸钙(钙矾石)比低硫型水化硫铝酸钙容易碳化,两者碳化后均分解成碳酸钙、二水石膏、铝胶。与水化铝酸钙相比,水化硫铝酸钙更容易碳化。C_3AH_6是这些水化物中最稳定的。水化铝酸钙碳化分解成碳酸钙和铝胶,碳铝酸盐可作为过渡产物存在。提出这些水化物的碳化反应受扩散控制。通过碳化过程中的物相变化探讨了反应机理,提出了碳化反应方程。
In this paper, carbonation of hydrated calcium aluminates and calcium sulphoaluminates are studied. The results show that ettringite is easier to react with CO_2 than monsulfoaluminate. They both decompose to form carbonate, gypsum, gibbsite. Hydrates of calcium aluminate are more stable than that of calcium sulphoaluminate, and C_3AH_6 is the most stable one. Hydrates of calcium aluminate decompose during carbonation and form calcium carbonates, gibbsite. Carbo-aluminate exists as mesoproduct and decomposes also when acting with CO_2. It is suggested that carbonation of these hydrates powder is diffusion-controlled. With IR and XRD, the carbonation reaction mechanism is proposed.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1989年第2期173-180,共8页
Journal of The Chinese Ceramic Society
