高镁炉渣酸解液硅酸自聚-离心脱硅工艺研究  

Study on desilication process of silicic acid from high magnesium slag acidolysis solution by self-polymerization and centrifugal

作　　者：姚衡 汤建伟[2,3] 刘咏 刘鹏飞[2] 化全县 王保明[2,3] YAO Heng;TANG Jianwei;LIU Yong;LIU Pengfei;HUA Quanxian;WANG Baoming(School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Ecology and Environment,Zhengzhou University;National Centre of Research & Popularization on Calcium,Magnesium,Phosphate and Compound Fertilizer Technology)

机构地区：[1]郑州大学化工学院 [2]郑州大学生态与环境学院 [3]国家钙镁磷复合肥技术研究推广中心

出　　处：《无机盐工业》2022年第11期83-89,共7页Inorganic Chemicals Industry

基　　金：国家重点研发计划项目(2016YFD0300800)。

摘　　要：利用酸法提取高炉渣中有价元素的过程中,存在着酸解液硅浓度过高的问题,不利于后续的过滤和金属元素的进一步富集,因此需要进行脱硅操作。针对溶液中硅的脱除问题,基于硅酸自聚原理,提出了硅酸自聚-离心脱硅的实验方法,该方法避免了沉淀法容易引入杂质的问题,适合酸性环境下高浓度硅的脱出。研究了不同实验条件对脱硅率的影响,采用电感耦合等离子体发射光谱(ICP-OES)对脱硅液成分进行分析,并通过X射线衍射(XRD)、扫描电镜-能谱(SEM-EDS)对离心硅渣的晶体结构和微观形貌进行分析,同时采用傅里叶红外(FT-IR)和核磁共振谱(NMR)研究硅酸聚合过程。通过实验发现,脱硅的最适宜工艺条件为:c(H^(+))为3.5 mol/L,反应温度为70℃,保温时间为2 h,离心转速为3 500 r/min,离心时间为3 min。在该条件下达到了99.5%的脱硅率。The extraction of valuable elements from blast furnace slag by using the acid method suffers from the problem of high silicon concentration in the acid solution,which is not conducive to subsequent filtration and further enrichment of metallic elements,so desilication operations are required.For the problem of desilication from solution,an experimental method of silicic acid self-polymerization-centrifugal desilication was proposed based on the principle of silicic acid self-polymerization,which avoided the problem of easy introduction of impurities by precipitation method and was suitable for the removal of high concentration of silicon under acidic environment.The effects of different experimental conditions on the desilication rate were investigated.The composition of the desilication solution was analyzed by inductively coupled plasma optical emission spectroscopy(ICP-OES),and the crystal structure and microscopic morphology of centrifugal silica slag were analyzed by X-ray diffraction analysis(XRD)and scanning electron microscopy-energy dispersive specterometer(SEMEDS),while fourier transform infrared spectroscopy(FT-IR)and nuclear magnetic resonance spectroscopy(NMR)were used to study the silicic acid polymerization process.It was found that the optimum process conditions for desilication were:c(H^(+))of 3.5 mol/L,reaction temperature of 70 ℃,holding time of 2 h,centrifugal speed of 3 500 r/min and centrifugal time of 3 min,and the desilication rate of 99.5% was achieved under these conditions.

关 键 词：炉渣 脱硅 硅酸自聚 离心脱硅 

分 类 号：X705[环境科学与工程—环境工程]