太原理工大学学报2011，Vol.42Issue(2)：169-173,5.
酸性介质中酸不溶物微粒SiO2的絮凝沉降研究
Flocculation and Settlement of Insoluble SiO2 Matters in Acid Medium
摘要
Abstract
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(T8/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 Gl, 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Key words
flocculation and settling/ insoluble matters/ settlement machanism/ bridging adsorption分类
化学化工引用本文复制引用
王培功,郑晓霞,李双志,樊彩梅,冯军强,荆宏健..酸性介质中酸不溶物微粒SiO2的絮凝沉降研究[J].太原理工大学学报,2011,42(2):169-173,5.基金项目
天脊集团科技创新发展基金项目(2008-1225) （2008-1225）
