酸性介质中酸不溶物微粒SiO_2的絮凝沉降研究  

Flocculation and Settlement of Insoluble SiO_2 Matters in Acid Medium

作　　者：王培功[1] 郑晓霞[1] 李双志[1] 樊彩梅[1] 冯军强[2] 荆宏健 

机构地区：[1]太原理工大学化学化工学院,太原030024 [2]天脊煤化工集团股份有限公司,山西潞城047507

出　　处：《太原理工大学学报》2011年第2期169-173,共5页Journal of Taiyuan University of Technology

基　　金：天脊集团科技创新发展基金项目(2008-1225)

摘　　要：采用絮凝沉降原理对酸性介质中的酸不溶物微粒(SiO2)进行了处理,并用红外光谱对其结构进行了表征,通过比较酸不溶物的平均沉降速率、实验现象以及固液分界面的清晰度研究了无机凝聚剂T8、有机絮凝剂(G1,G2,G3)和复配絮凝剂(T8/G1,T8/G2,T8/G3)发生絮凝沉降的机理,确定了理想的絮凝剂及其适宜加入量。结果表明,酸不溶物表面含有羟基(-OH)基团且带有正电荷;T8主要通过增大酸不溶物的体积加快沉降速率,而G1或G2或G3则通过吸附架桥作用,并且均存在适宜的加入量,处理效果以复配絮凝剂T8/G1为最佳,适宜的沉降条件为:70 g/L的酸不溶物悬浮液中,T8加入量600 mg/L,G1加入量15 mg/L,达到的平均沉降速率是8.7 mm/min。In this paper, flocculation and settlement were used to deal with insoluble SiO2 matters in nitric acid and the chemical structure of insoluble matters（SiO2 ） was characterized with FTIR spectra. By comparing the average settling rates of insoluble matters, experimental phenomenan and definitions of solid-liquid interface, the mechanisms of flocculation and settlement of coagulant（T8）, organic flocculants（G1, G2 and G3） and composite flocculants（TS/G1, T8/G2 and T8/G3） were investigated and perfect flocculant with its optimum dosage was determined. The results show that the surfaces of insoluble matters in nitric acid have hydroxyl group and positive charge. The settling rate of insoluble matters is accelerated by T8 via increasing their volume, by contrast, G1 or G2 or G3 via bridging adsorption and the additive amount of G1, G2, G3 has an optimum dosage separately. The favorite composite flocculant is T8/G1, when dealing with the suspension of insoluble matters with the concentration of 70 g/L, the optimum dosage is T8 600 mg/L, G1 15 mg/L, under these conditions the average settling rate reaches 8.7 mm/ min.

关 键 词：絮凝沉降 酸不溶物 沉降机理 吸附架桥 

分 类 号：TQ028.5[化学工程]