乙二胺四乙酸配位螯合法制备钴铝尖晶石蓝色颜料

提出一种可以在较低温度下焙烧制备出钴铝尖晶石蓝色颜料的方法.以六水合硝酸钴、九水合硝酸铝为主要原料，乙二胺四乙酸(EDTA)为配位螯合剂，通过EDTA配位螯合钴、铝得到有机配合物前驱体，经过焙烧制备钴蓝颜料.通过国际照明委员会的色度图谱(CIE)、X射线衍射(XRD)和傅里叶红外光谱(FTIR)，分别对所制备样品的物相和呈色进行研究表征.主要考察了钴铝物质的量比、反应体系pH值、焙烧温度等工艺条件对铝酸钴尖晶石相的完整性和颜料呈色的影响.制备钴铝尖晶石蓝色颜料的最佳工艺参数是900 ℃温度下保温时间为2 h，pH值为9~10，前驱体的钴铝比为 1∶2.5.

BluePigment Cobalt-Aluminum Spinels Prepared by EDTA Chelating Method

A method is proposed to prepare cobalt aluminum spinel blue pigment under a relatively low temperature.Cobalt aluminum spinels were prepared by the thermal decomposition of EDTA chelating cobalt and aluminum complex precursors which are derived from metal nitrate salts and ethylenediamine tetraacetic acid (EDTA).EDTA was used for chelating agent,cobalt nitrate hexahydrate and aluminum nitrate nonahydrate were used to synthesize the precursors.The phase and coloration of the prepared samples were characterized by the Commission International Eclairage (CIE) chromaticity diagram,X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR).The main variables which can systematically investigate the coloration and crystalline phase were cobalt-aluminum ratio,pH value of the reaction system and the calcination temperature.The optimizing process parameters to prepare cobalt aluminum spinel blue pigment:the temperature is 900 ℃ with 2 h heating preservation,the pH value is 9~10,and the cobalt-aluminum mole ratio is 1∶2.5 in the precursors.