化工进展2015，Vol.34Issue(12)：4375-4378,4397,5.DOI:10.16085/j.issn.1000-6613.2015.12.040
碱化度对聚合氯化铝混凝除硅的影响
Influence of basicity of polyaluminum chloride on removal of silicon
摘要
Abstract
By analyzing the alkalization degree of existing industrial-grade polymeric aluminum chloride in the laboratory and investigating several chemical reagent factories,we obtained that the alkalization degree of polymeric aluminum chloride commonly used on site is between 1.5—2.7. By synthesizing polymeric aluminum chloride with different alkalization degrees (2.0—2.4),we conducted a systematic coagulation experiment on the simulation of scale-forming water,and investigated the influence of alkalization degree on the coagulation silica removal of polymeric aluminum chloride. The results show that the alkalization degree will determine the distribution of aluminum speciation and therefore influence the effect of coagulation silicon removal. As the alkalization degree increases,the content of Alagradually decreases,the content of Albfirst increases and then decreases,while the content of Alc gradually increases. After simulation of wastewater treatment,the residual silicate speciation is largely different. After silicon removal of polymeric aluminum chloride (2.0),the content of Sia changes to 32.1mg/L,and the content of Sic changes to 15.3mg/L;after silicon removal ofpolymeric aluminum chloride (2.2),the content of Sia changes to 28.71mg/L,and the content of Sic changes to 30.5mg/L;after silicon removal of polymeric aluminum chloride (2.4),the content of Sia changes to 22.4mg/L,and the content of Sic changes to 41.2mg/L. The proportion in the decrease of Sia is the largest after silicon removal of polymeric aluminum chloride (2.0),and the proportion in the decrease of Sic is the largest after silicon removal of polymeric aluminum chloride (2.4). With the increase of alkalization degree,the total residual silicon contents are respectively 47.4mg/L,59.5mg/L and 63.6mg/L. Within the author's scope of research,the lower the alkalization degree,the better the effect of silica removal.关键词
聚合氯化铝/碱化度/铝形态/硅形态/混凝除硅Key words
polyaluminum chloride/basicity/aluminum speciation/silicon speciation/coagulation for silica removal分类
化学化工引用本文复制引用
赵晓非,张晓阳,杨腾飞,范蕾,王顺武,于庆龙..碱化度对聚合氯化铝混凝除硅的影响[J].化工进展,2015,34(12):4375-4378,4397,5.基金项目
黑龙江省教育厅科学技术研究项目(12531061). （12531061）
