用略阳电厂粉煤灰合成沸石的试验研究

Test on Synthesizing Zeolite with Fly Ash of Lueyang Power Plant

以略阳电厂粉煤灰为原料,进行了用水热法和熔融水热法合成A型沸石和Y型沸石的试验研究。结果表明:粉煤灰在80℃和碱性条件下水热反应4d,可获得含P型沸石和X型沸石的粉煤灰沸石;向粉煤灰中加入Al(OH)3和NaOH固体,以800℃熔融1h后,在80℃下水热反应12h,可获得A型沸石;向粉煤灰中加入硅灰石和NaOH固体,以800℃熔融1h后,在80℃下水热反应36h,可获得Y型沸石。将3种合成沸石与天然沸石和粉煤灰进行吸附溶液中Cd2+的对比,吸附能力由强到弱的排序为Y型沸石>A型沸石>粉煤灰沸石>天然沸石>粉煤灰。

Test was conducted on synthesizing zeolite A and zeolite Y by hydrothermal method and mehing-hydrothermal method with the fly ash of Lueyang Power Plant. The results indicate that when fly ash is under the hydrothermal reaction and alkaline condition at 80 ℃ for d d, fly ash zeolite containing zeolite A and zeolite Y can be obtained. Zeolite A can be obtained by adding AI（OH）3 and NaOH solids into fly ash, melting at 800 ℃ for one hour and hydrothermal reaction at 80 ℃ for 12 h; and Zeolite Y can be obtained by adding wollastonite and NaOH solids into the fly ash, melting at 800 ℃ for one hour and hydrothermal reaction at 80 ℃ for 36 h. The three kinds of synthesizing zeolite are compared with natural zeolite and fly ash in adsorbing Cd^2＋ in the solution, and the adsorption ability is sequenced from strong to weak as： zeolite Y 〉 zeolite A 〉 flyash zeolite 〉 natural zeolite 〉 fly ash.