碱熔预处理对粉煤灰溶解规律的影响及其动力学

在用粉煤灰合成沸石分子筛的过程中，粉煤灰在碱液中的溶解影响到合成反应的速率以及合成分子筛的性能。采用碱熔的方法处理粉煤灰，研究了粉煤灰在碱液中的溶解机理以及碱熔预处理对粉煤灰溶解规律的影响，并采用Noyes-Whitney方程分析其溶解动力学。结果表明，经过碱熔预处理的粉煤灰有36．11％的SiO2和16．33％的Al2O3转化为水溶性成分，剩余的非水溶性部分在碱液中的溶解速率也有大幅提高，硅铝离子达到平衡浓度的时间缩短，铝离子的平衡浓度有较大提升。Noyes-Whitney方程对粉煤灰在碱液中的溶解规律适用，相关系数都达到0．979以上。

Effect of alkaline fusion pretreatment on dissolution mechanism of fly ash and its adsorption kinetics

During the process of synthesis of zeolites using fly ash, the dissolution of the fly ash in the alka- line solution influences the rate of synthesis and the quality of synthetic zeolites. The mechanism of fly ash dissolu- tion and the influence of alkaline pretreatment to fly ash dissolution were studied. The kinetics of dissolution of fly ash was studied by the Noyes-Whitney equation. The results show that the 36.11% silica and 16.33% alumina are converted into the soluble compositions through the alkaline pretreatment and the dissolution rates of remain insolu- ble compositions are enhanced in the alkaline solution. In addition, the Noyes-Whitney equation can be applied in the dissolution of fly ash in the alkaline solution and the correlation coefficient reaches more than 0. 979.