系统研究了由粉煤灰合成沸石过程中温度、反应时间、液固比和NaOH浓度等合成条件对沸石生成及其阳离子交换容量(CEC,CationExchangeCapacity)的影响.结果表明,温度主要影响沸石矿物的结晶度;液固比主要影响沸石种类;NaOH浓度和反应时间对两者均产生明显影响.合成产物的CEC随温度、液固比、反应时间呈快速增加,并在分别达到110℃、2.5和16h时趋于一最大值.NaOH浓度越高,合成产物CEC也越高,至2mol·L-1时达到最大,之后显著下降.考虑到合成成本,最佳合成条件初步归纳为:温度110-120℃,反应时间8-16h,液固比2.5,NaOH浓度2mol·L-1.
The formation and cation exchange capacity (CEC) of zeolite synthesized after alkaline activation of a Chinese fly ash, as a function of temperature, liquid/solid ratio, NaOH concentration
and reaction time in closed systems were investigated. Temperature affected mainly the crystallinity of zeolite formed, liquid/solid ratio
affected mainly the type of zeolite, and while NaOH concentration and reaction time influenced both of them. The CEC value of synthesized products
increased greatly as a function of temperature, liquid/solid ratio and reaction time until the temperature of 110℃, the ratio of 2.5,
and the time of 16h were reached, and then approached to a constant value. The CEC value of synthesized zeolite increased initially with the increase
in NaOH concentration, reached its maximum value at a concentration of 2mol·L-1, and then decreased sharply above the concentration.
The results show that from the economic point of view, the optimal conditions are as follows: a temperature of 110～120℃, a reaction time of 8～16h,
a liquid/solid ratio of 2.5, and a NaOH concentration of 2mol·L-1.
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