文档介绍：刘欢等:***化铁–硫酸钠体系中合成的施威特曼石的稳定性· 669 ·第41卷第5期DOI:.0454– 热处理针铁矿的结构与色度演化邹雪华,陈天虎,刘海波,陈冬,张萍,谢巧勤(合肥工业大学资源与环境工程学院,合肥 230009) 摘要:利用X射线粉末衍射仪、透射电子显微镜、比表面积分析仪、漫反射光谱仪等研究了针铁矿在空气气氛中的热结构演化和色度变化规律,并以红度、黄度、橙度和总反射率表征色度变化。结果表明:煅烧温度低于200℃时,针铁矿未发生相变,,样品颜色为橙黄色,总反射率、红度、橙度、黄度变化不明显;高于200℃时,针铁矿开始转变成赤铁矿,并形成纳米孔结构,比表面积呈现先增加后减小的变化,在250℃,颜色由橙黄色变成赤红色,总反射率、橙度和黄度降低,红度升高;且随着煅烧温度升高,针铁矿相变形成的颗粒内部纳米孔孔径逐渐增大,比表面积急剧减小,煅烧产物的颜色略有变化,总反射率、橙度、黄度和红度变化不明显;当温度大于750℃时,纳米孔消失,温度为900℃时,,产物颜色从赤红色向暗红色转变,总反射率和红度降低,橙度与黄度未变。关键词:针铁矿;赤铁矿;色度演化;结构演化;热处理中图分类号:P575 文献标志码:A 文章编号:0454–5648(2013)05–0669–05 网络出版时间:2013–04–23 10:25:15 网络出版地址:s/detail/ Structural and Chromatic Evolution of Goethite by Thermal Treatment ZOU Xuehua,CHEN Tianhu,LIU Haibo,CHEN Dong,ZHANG Ping,XIE Qiaoqin (School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China) Abstract: The structural and chromatic evolution of synthesized goethite calcinated in air was analyzed by X-ray powder diffraction, transmission electron microcopy and nitrogen adsorption analysis for specific surface area, respectively. Also, the chromaticity change of goethite was determined by diffuse reflectance spectroscopy. The results show that the orange goethite calcinated at 200℃ has the specific surface area of and no phase transf