复合聚硅酸铁混凝剂的制备、性能与混凝机理研究  

Study on Preparation,Properties and Coagulation Mechanism of Composite Polysilicate Ferric Coagulant

作　　者：李立辉 丛忠奎 陈建设 李斌川 刘奎仁 韩庆 LI Lihui;CONG Zhongkui;CHEN Jianshe;LI Binchuan;LIU Kuiren;HAN Qing(School of Metallurgy,Northeastern University,Shenyang 110819,China;Key Laboratory for Ecological Metallurgy of Multimetallic Mineral,Ministry of Education,Shenyang 110819,China;Shenyang Key Laboratory of Nonferrous Metal Resource Recycling,Shenyang 110819,China;Liaoning Xindu Gold Co.,Ltd.,Chaoyang 122099,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110819 [3]沈阳市有色金属资源循环利用重点实验室,辽宁沈阳110819 [4]辽宁新都黄金有限责任公司,辽宁朝阳122099

出　　处：《金属矿山》2023年第7期268-274,共7页Metal Mine

基　　金：云南省自然科学基金项目(编号:202101AS070029)。

摘　　要：为探明硅铁物质的量比对聚硅酸铁混凝效果的影响规律,以Na_(2)SiO_(3)·5H_(2)O、Fe_(2)(SO_(4))_(3)·7H_(2)O为原料制备6种聚硅酸铁,通过XRD、SEM及FTIR等分析手段对聚硅酸铁进行物相和微观形貌表征,并系统研究了聚硅酸铁用量、pH值、搅拌时间等工艺参数对COD去除率的影响。结果表明:①聚硅酸铁具有多晶相结构,随硅铁物质的量比的增加,表面形貌由空心管状逐渐向片状结构转变。②随着硅铁物质的量比的增加,聚硅酸铁中Fe(Ⅲ)的自由离子、单核羟基络合物含量减少,聚硅酸铁的电中和能力减弱;相应硅酸多聚体含量升高,聚硅酸铁吸附架桥能力得到提升。③针对丁基钠黄药和二号油所制备水样,采用硅铁物质的量比为0.5的聚硅酸铁混凝剂净化处理,在聚硅酸铁用量为4 mmol/L、pH值为5.0、搅拌时间为20 min的条件下,COD去除率可达到48%。与Fe_(2)(SO_(4))_(3)·7H_(2)O、聚硅酸相比,聚硅酸铁混凝性能明显提升,混凝过程电中和与吸附架桥共同作用。In order to find out the effect of ferrosilicon mole ratios on the coagulation effect of ferrosilicate,six kinds of ferrosilicate were prepared with Na_(2)SiO_(3)·5H_(2)O and Fe_(2)(SO_(4))_(3)·7H_(2)O as raw materials,and the phase and microscopic morphology of ferrosilicate were characterized by XRD,SEM and FTIR.The effects of ferric polysilicate dosage,pH value,stirring time and other process parameters on COD removal rate were systematically studied.The results showed that:①Ferric polysilicate has a polycrystalline phase structure.With the increase of the material ratio of ferric silicate,the surface morphology changes from hollow tubular to sheet.②With the increase of ferrosilicon mole ratios,the content of Fe(Ⅲ)free ion and mononuclear hydroxyl complex in ferrosilicate decreased,and the electric neutralization ability of ferrosilicate decreased;The adsorption and bridging capacity of ferric polysilicate was improved with the increase of silicate polymer content.③For the water samples prepared by sodium butyl xanthate and No.2 oil,the removal rate of COD could reach 48%when the dosage of ferric silicate is 4 mmol/L,the pH value is 5.0 and the stirring time is 20 min.Compared with Fe_(2)(SO_(4))_(3)·7H_(2)O and polysilicic acid,the coagulability of polysilicic iron is obviously improved,and the electric neutralization and adsorption bridge work together during the coagulation process.

关 键 词：复合混凝剂 Fe形态分布 Si形态分布 电中和 吸附架桥 

分 类 号：X703.5[环境科学与工程—环境工程]