黄陵煤泥制备聚氯化铝铁絮凝剂及絮凝性能研究

黄陵煤泥灰中Al2O3占19.67%,Fe2O3占7.23%,为了利用其较高的铝、铁含量,通过对煤泥灰进行煅烧活化、酸浸、聚合等过程,制备无机高分子絮凝剂聚氯化铝铁(PAFC)。正交实验表明,对铝铁浸出率影响最大的因素是煅烧温度,其次是酸浸时间,并得出最佳工艺条件为:煅烧温度800℃,煅烧时间2.5 h,盐酸浓度6 mol/L,液固比6,酸浸时间4.5 h。自制PAFC的红外光谱和扫描电镜图分析表明,产品中铝铁元素得到了很好的聚合。煤泥水絮凝实验表明,当PAFC投加量为30 mg/L,p H为6~8时,絮凝效果最好,透光率达到91.7%。

Preparation and flocculation efficiency of polyaluminum ferric chloride with Huangling coal slime

The content of Al2 O3 and Fe2 O3 were 19.67% and 7.23% in Huangling coal slime ash.In order to utilize the high aluminum and iron,the polyaluminum ferric chloride （PAFC） was prepared through calcining coal slime ash,acid leaching and polymerization.The analy-sis of orthogonal test showed that the calcination temperature was the main influencing factor on the aluminum and iron leaching rate,fol-lowed by acid leaching time.The optimum process were that,the calcination temperature was 800 ℃ ,the calcining time was 2.5 hours,the concentration of hydrochloric acid was 6 mol/ L,the ratio of liquid to solid was 6,the leaching time was 4.5 hours.The infrared spectroscopy and scanning electron microscopy indicated that aluminum and iron in the products polymerized well.The flocculation test of coal slime wa-ter showed that,when the polyaluminum ferric chloride dosage was 30 mg/ L and pH ranged from 6 to 8,the flocculation effect was the best and the transmission rate was 91.7%.