硅锰渣复合粉煤灰水热合成NaA沸石及其表征

对硅锰渣进行高温煅烧预处理,并复合粉煤灰作为原料,采用水热法合成了结晶度良好的NaA沸石。研究了硅铝比(n(SiO₂)/n(Al₂O₃))、碱度(c(NaOH))、水热温度以及水热时间等条件对合成产物的影响。结果表明:在煅烧硅锰渣与粉煤灰以质量比为1∶1,n(SiO₂)/n(Al₂O₃)=2.2,反应温度为90 ℃,碱度为2 mol/L,反应时间为4 h的条件下即可合成结晶度良好且具备一定热稳定性的NaA沸石。相较于传统的以粉煤灰为原料合成NaA沸石,本实验掺入硅锰渣形成复合体系,为硅锰渣的资源化利用提供了新途径。

Hydrothermal Synthesis and Characterization of Zeolite NaA Based on Combination of Silico-Manganese Slag and Fly Ash

The high crystallinity of zeolite NaA were prepared by hydrothermal method based on the combination of calcined silico-manganese slag(Si-Mn slag)and fly ash.The influence of n(SiO₂)/n(Al₂O₃),the concentration of NaOH,hydrothermal temperature and hydrothermal time on products were studied by single factor experiment.The results show that the zeolite NaA with good crystallinity and thermal stability can be synthesized at the condition of the mass ratio of calcined silico-manganese slag and fly ash=1∶1,n(SiO₂)/n(Al₂O₃)=2.2,temperature of 90℃,alkalinity of 2 mol/L and reaction time of 4 h.Compared with the traditional synthesis of the zeolite NaA with fly ash as raw material,the addition of silico-manganese slag makes it a composite system,providing a new way for the resource utilization of silico-manganese slag.