铝土矿焙烧和溶出脱硅的X射线衍射研究  

X RAY DIFFRACTION STUDY ON DESILICATION OF DIASPORIC BAUXITE BY ROAST AND DIGESTION

作　　者：钱崇梁[1] 刘永康[1] 吴恩熙[1] 何伯泉[2] 

机构地区：[1]中南工业大学粉末冶金国家重点实验室 [2]中国有色金属工业总公司

出　　处：《中国有色金属学报》1997年第3期63-66,共4页The Chinese Journal of Nonferrous Metals

基　　金："九五"国家重点科技攻关资助

摘　　要：通过对高岭石和铝土矿焙烧过程物相变化的Ｘ射线衍射研究，阐明了铝土矿化学选矿预脱硅的机理。实验表明，矿石中固有的αＳｉＯ２（石英）是不能被脱除的，只有在焙烧温度高达９００℃以上、由偏高岭石分解形成的那部分非晶ＳｉＯ２才能被ＮａＯＨ溶出而脱除。此外，溶出精矿的相分析结果澄清了过去认为在低压溶出脱硅条件下高岭土是稳定存在的误解。给出了提高铝土矿铝硅比值的最佳焙烧工艺制度。The phase transitions of kaolinite and diasporic bauxite during roasting were studied by means of XRD analysis. The desilication mechanism of diasporic bauxite by chemical processing was explained. It was shown that the α SiO 2(quartz) in green ores can not be separated, but the amorphous SiO 2 formed by roasting kaolinite at temperature above 900 ℃ can be desilicated. The XRD analysis results of digested products cleared the misunderstanding that the kaolinite was the stable phase under the low pressure digestion condition. The suitable roast rule to increase the Aluminum/Silicon ratio(A/S) of diasporic bauxite was also presented.

关 键 词：铝土矿 脱硅 焙烧 X射线衍射 氧化铝 化学选矿 

分 类 号：TQ133.1[化学工程—无机化工] TD952.5[矿业工程—选矿]