复合聚硅酸铁混凝剂的制备、性能与混凝机理研

金属矿山 ›› 2023, Vol. 52 ›› Issue (07): 268-274.

复合聚硅酸铁混凝剂的制备、性能与混凝机理研

李立辉^1,2,³ 丛忠奎⁴ 陈建设^1,2,³ 李斌川^1,2,³ 刘奎仁^1,2,³ 韩庆^1,2,3

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

出版日期:2023-07-15 发布日期:2023-09-05
基金资助:
云南省自然科学基金项目(编号:202101AS070029)。

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

LI Lihui^1,2,3 CONG Zhongkui⁴ CHEN Jianshe^1,2,3 LI Binchuan^1,2,3LIU Kuiren^1,2,3 HAN Qing^1,2,3

1. School of Metallurgy,Northeastern University,Shenyang 110819,China;2. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral,Ministry of Education,Shenyang 110819,China;3. Shenyang Key Laboratory of Nonferrous Metal Resource Recycling,Shenyang 110819,China;4. Liaoning Xindu Gold Co. ,Ltd. ,Chaoyang 122099,China

Online:2023-07-15 Published:2023-09-05

摘要/Abstract

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 Na2SiO3· 5H2O、Fe2(SO4)3· 7H2O 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 Fe2( SO4 )3· 7H2O、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。

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

Abstract: In order to find out the effect of ferrosilicon mole ratios on the coagulation effect of ferrosilicate,six kinds of ferrosilicate were prepared with Na2SiO3· 5H2O and Fe2(SO4)3· 7H2O 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:① Ferric 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. ② With 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. ③ For 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 Fe2(SO4)3· 7H2O and polysilicic acid,the coagulability of polysilicic iron is obviously improved,and the electric neutralization and adsorption bridge work together during the coagulation process.

Key words: compound coagulant,Fe morphology distribution,Si morphology distribution,electric neutralization,adsorption bridging

李立辉, 丛忠奎, 陈建设, 李斌川, 刘奎仁, 韩庆. 复合聚硅酸铁混凝剂的制备、性能与混凝机理研[J]. 金属矿山, 2023, 52(07): 268-274.

LI Lihui, CONG Zhongkui, CHEN Jianshe, LI Binchuan, LIU Kuiren, HAN Qing. Study on Preparation,Properties and Coagulation Mechanism of Composite Polysilicate Ferric Coagulant[J]. Metal Mine, 2023, 52(07): 268-274.

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