高铁高硅煤矸石制备P型分子筛

Preparation of P Type Molecular Sieves from Gangue of High Iron and High Silica Content

以高铁高硅的煤矸石为主要原料,经350℃氧化2 h、酸浸除铁后,先在750℃条件下煅烧2 h,然后在400℃条件下,经NaOH碱熔活化2 h,再水热晶化,得到了P型分子筛。运用XRF,XRD,SEM等仪器对原矿、预处理产物和晶化产物进行了检测,结果表明:氧化后硫酸酸浸除铁率为96.8%;碱熔能使煤矸石煅烧粉生成可溶性的硅铝酸盐;产物为纯净的P型分子筛,平均粒径为2.53μm;Ca2+交换量为325 mg CaCO3/g干基沸石,Mg2+交换量为96mg MgCO3/g干基沸石。

The high iron and silica content gangue was taken as the main material to synthesize P type molecular sieves by hydrothermal crystallization after oxidation at 350 ℃ for 2 h,iron removal by acid leaching,calcination at 750 ℃ for 2 h and alkali melting at 400 ℃ for 2 h.The ore,the pretreated material and the crystallization products were characterized by XRF,XRD and SEM.The results showed that the iron removal ratio of sulfuric acid leaching was 96.8%,the calcined gangue powder turned into soluble aluminosilicate.The crystallization products were pure P type molecular sieves,the average particle size was 2.53 μm,the calcium ion exchange capacity of the dry products was 325 mg CaCO3/ g,the magnesium iron exchange capacity of the dry products was 96 mg MgCO3/ g.