两种类水滑石母液回用的工艺技术研究
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摘要
以为寻求降低生产成本和减少环境污染的方法,试验采用低饱和度共沉淀法合成类水滑石,在合成的过程中存在废水量大和资源浪费的问题,通过对类水滑石母液回用的研究,探究类水滑石母液再用是否对新制备的类水滑石结构产生影响。试验采用低饱和度共沉淀法制备类水滑石,利用X-射线粉末衍射(XRD)对所制备的类水滑石样品进行表征。试验结果表明:所制备的两种类水滑石材料MgAl3-1 HTLcs和Fe Mg Al3-1HTLcs其XRD图上并没有发现MgO、Al_2O_3、Mg(OH)_2或Al(OH)_3衍射峰,而且衍射峰型窄尖,说明样品中的晶相单一,晶面生长的有序度较高,结晶度较好,类水滑石滤液以及重用滤液对类水滑石结构的形成几乎不产生影响。因此类水滑石母液的重复利用既降低了生产成本,又减少了环境污染,而且还提高了原子利用率,节约了资源。
In order to reduce the production cost and reduce the environmental pollution, the synthesis of hydrotalcitelike hydrotalcite by low saturation coprecipitation is a problem in the process of synthesis and waste of resources. By studying the reuse of hydrotalcite-like mother liquor, the effect of hydrotalcite-like mother liquor on the hydrotalcite-like structure was investigated. Hydrotalcite-like hydrotalcites were prepared by low saturation coprecipitation method. The prepared hydrotalcite-like hydrotalcite samples were characterized by X-ray powder diffraction(XRD). The results showed that MgO, Al_2O_3, Mg(OH)_2 or Al(OH)_3 diffraction peaks are not found on the XRD patterns of MgAl3-1 HTLcs and FeMgAl3-1 HTLcs prepared by the two hydrotalcite-like materials. The results indicate that the crystal phase is single, the order of crystal growth is higher, the crystallinity is better, the hydrotalcite-like filtrate and reuse filtrate have little influence on the formation of hydrotalcite-like structure. Therefore, the reuse of the hydrotalcite-like mother liquor not only reduces the production cost, but also reduces the environmental pollution, improves the atomic utilization rate and saves the resources.
In order to reduce the production cost and reduce the environmental pollution, the synthesis of hydrotalcitelike hydrotalcite by low saturation coprecipitation is a problem in the process of synthesis and waste of resources. By studying the reuse of hydrotalcite-like mother liquor, the effect of hydrotalcite-like mother liquor on the hydrotalcite-like structure was investigated. Hydrotalcite-like hydrotalcites were prepared by low saturation coprecipitation method. The prepared hydrotalcite-like hydrotalcite samples were characterized by X-ray powder diffraction(XRD). The results showed that MgO, Al_2O_3, Mg(OH)_2 or Al(OH)_3 diffraction peaks are not found on the XRD patterns of MgAl3-1 HTLcs and FeMgAl3-1 HTLcs prepared by the two hydrotalcite-like materials. The results indicate that the crystal phase is single, the order of crystal growth is higher, the crystallinity is better, the hydrotalcite-like filtrate and reuse filtrate have little influence on the formation of hydrotalcite-like structure. Therefore, the reuse of the hydrotalcite-like mother liquor not only reduces the production cost, but also reduces the environmental pollution, improves the atomic utilization rate and saves the resources.
引文
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[9]催小明.类水滑石化合物的生产及应用前景[J].上海化工,2009,30(3):27-31.
[10]宋国君,孙良栋,李培耀..水滑石的合成、改性及其功能复合材料的应用[J].材料导报,2008,22(1):53-57.
[11]CAVANI F,TRIFIR F A.Vaccari hydrotalcite-type anionicclays:preparation,properties and applications[J].Catalysis Today,1991,11(2):173-301.
[12]Kannan S,Rives V,Knozinger H.High-temperature transformations of Cu-rich hydrotalcites[J].Journal of Solid State Chemistry,2004,177(1):319-331.
[2]Cavani F.,Trifiro F.,Vaccari A.Hydrotalcitetype anionic clays:reparation,properties and applications[J].Catalysis Today,1991,11:173.
[3]Bellotto M.,Rebours B.,Clause O.,Lynch J.,Bazin D.,Elkaim E.Supramolecular Structure,Electronic Property and Stability of Ni-Mg-Al Layered Double Hydroxides[J].J Phys.Chem.,1996,100:8535.
[4]Rives V.Layered Double Hydroxides:Present and Future[M].Nova Science Publishers:New York,2001.
[5]Shigeo Miy Atas.A Raman spectroscopic study of organomontmorillonites,Journal of Raman Spectroscopy[J].Clays and Clay Materials,2004,23,369.
[6]Toshiyuki,Hibin,Absumu Tsunashima.Clean route for the synthesis of hydrotalcites and their property of selective intercalation with benzenedicarboxylate anions[J].Chem Mater,1998,10:4055.
[7]纪红兵,王乐夫.类水滑石材料应用于氧化反应研究最新进展[J].天然气化工,2002,27(10):49-54.
[8]谢鲜梅.类水滑石化合物的制备、性能及研究应用[D].山西:太原理工大学,2006.
[9]催小明.类水滑石化合物的生产及应用前景[J].上海化工,2009,30(3):27-31.
[10]宋国君,孙良栋,李培耀..水滑石的合成、改性及其功能复合材料的应用[J].材料导报,2008,22(1):53-57.
[11]CAVANI F,TRIFIR F A.Vaccari hydrotalcite-type anionicclays:preparation,properties and applications[J].Catalysis Today,1991,11(2):173-301.
[12]Kannan S,Rives V,Knozinger H.High-temperature transformations of Cu-rich hydrotalcites[J].Journal of Solid State Chemistry,2004,177(1):319-331.