鄂尔多斯煤矸石合成A型沸石吸附剂试验研究

Synthesis of Zeolite A Adsorbents by Coal Gangue in Erdos

试验以内蒙古鄂尔多斯煤矸石为原料,采用水热法合成A型沸石吸附剂。以氨氮去除率为指标,通过正交试验考察了焙烧温度、焙烧时间、晶化温度、晶化时间对合成A型沸石的影响并确定了最佳合成条件。结果表明:对A型沸石氨氮去除率的影响顺序为晶化温度>晶化时间>焙烧时间>焙烧温度,最佳合成条件为焙烧温度750℃,焙烧时间2.5 h,晶化温度95℃,晶化时间8 h。样品经XRD、SEM、BET表征,得到了形态较佳且结晶度较好的A型沸石,且该产品为良好的吸附剂。

The zeolite-based adsorbents were synthesized from coal gangue in Erdos by hydrothermal synthesis. The ammonia-nitrogen removal efficiency was regarded as an indicator, the effect of calcinations temperature, calcinations time, crystallization temperature, and crystallization time on the zeolite A was studied by orthogonal test method and the optimum synthesis conditions were determined.The results show that crystallization temperature is the maximal influence factor on the ammonia-nitrogen removal efficiency of zeolite A, followed by the crystallization time and calcinations time, the minimum is calcinations temperature, and the optimum synthesis conditions are as follows, calcinations temperature is 750 Tl , calcinations time is 2. 5 h, crystallization temperature is 95 Tl , and crystallization time is 8 h.The XRD, SEM and BET show that the zeolite A with better morphology, higher crystallinity, and it is still a good adsorbent.