利用α-石英基煤矸石合成4A分子筛的研究

Research on synthesis of 4A molecular sieve from α-silica-based gangue

结合煤矸石合成4A分子筛的工艺流程,对焙烧温度、酸浸条件、碱熔条件、晶化温度和时间等影响因素进行了对比实验,得出最佳合成条件:焙烧温度700℃、浸取温度70℃下在4 mol/L盐酸中酸浸8 h、熔融反应温度850℃且n(Na_(2)O)/n(SO_(2))为1.2~1.4、晶化温度90~110℃下晶化2~4 h.在此条件下,α-石英基煤矸石得到了充分活化,利用其制备出的4A分子筛结晶度高、收率高.从而指出了α-石英基煤矸石利用的新途径.

Combining with the technological process of synthesizing 4A molecular sieve from coal gangue,we carried out comparative experiments on the influencing factors such as calcination temperature,acid leaching condition,alkaline fusion condition,crystallization temperature and time,and obtained the optimal synthesis conditions as followed:calcination temperature was 700℃,acid leaching temperature was below 70℃in 4 mol/L hydrochloric acid for 8 hours,melting reaction temperature was 850℃ with n(Na_(2)O)/n(SO_(2))of 1.2~1.4,crystallization temperature was 90~110℃ for 2~4 hours.Under these conditions,the α-silica-based gangue was fully activated,and the 4A molecular sieve from it had high crystallinity and yield.It gave a new direction for the utilization of α-silica-based gangue.