干燥预处理联合湿法纯化氟化铝残渣工艺研究  

Drying pretreatment combined with wet purification process of aluminum fluoride residue

作　　者：李婷婷 艾怡君 夏举佩[1] LI Ting-ting;AI Yi-jun;XIA Ju-pei(School of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan Province,China)

机构地区：[1]昆明理工大学化学工程学院,云南昆明650500

出　　处：《化学工程》2022年第9期68-73,共6页Chemical Engineering(China)

摘　　要：以氟硅酸与氢氧化铝制备氟化铝过程中产生的残渣(简称硅渣)为研究对象,为解决目前由该渣打入磷石膏这种处理方式所带来的影响,实现固废资源化利用,首先对其采用直接湿法纯化处理,发现效果差,然后结合对硅渣微观形貌的分析,提出干燥预处理与湿法联合纯化工艺。在单因素实验的基础上,通过响应曲面法对硅渣的纯化工艺条件进行优化。结果表明,在酸用量为1.0倍、搅拌速度为300 r/min、反应时间为110 min、反应温度为78℃及液固比为3.5∶1的条件下,残余铝质量分数低至0.039%,残余氟质量分数低至0.029%。借助XRD、TEM及EDS谱图等分析手段,确定硅渣的纯化工艺并解释硅渣干燥预处理后易于纯化的原理,分析硅渣纯化前后的物相组成,为硅渣的后续应用研究提供理论支撑。In order to solve the influence caused by the current treatment method of the slag into phosphogypsum and realize the resource utilization of solid waste,the aluminum fluoride residue(silicon residue)prepared by fluorosilicic acid and aluminum hydroxide was taken as the research object.First,the direct wet method was used to purify the silicon slag,and the effect was poor.Then,combined with the appearance morphology analysis of silicon residue,the drying pretreatment and wet combination purification process was proposed for the first time.On the basis of single factor experiment,the response surface methodology was used to optimize the purification process of silicon residue.As a result,under the conditions of acid dosage 1.0 times,stirring speed 300 r/min,reaction time 110 min,reaction temperature 78℃and liquid-solid ratio 3.5∶1,the residual aluminum and the residual fluorine mass fraction decreased to 0.039%and 0.029%,respectively.The purification process was determined by X-ray diffraction(XRD),transmission electron microscope(TEM)and energy dispersive spectroscopy(EDS),and the principle of easy purification after drying pretreatment of silicon residue was explained.Finally,the composition of the substance before and after the purification of silicon residue was analyzed,which can provide theoretical support for the subsequence application.

关 键 词：氟化铝残渣 干燥预处理 响应曲面法 纯化 

分 类 号：X781[环境科学与工程—环境工程]