铝电解质物相组成对X射线衍射法测定分子比的影响  

Effect of phase composition of aluminum electrolyte on molecular ratio determination by X-ray diffraction

作　　者：李波 张树朝 王文广 瞿媛媛 冯敬东 LI Bo;ZHANG Shuchao;WANG Wenguang;QU Yuanyuan;FENG Jingdong(Zhengzhou Non-ferrous Metals Research Institute Co.,Ltd.of CHALCO,Zhengzhou 450041,China)

机构地区：[1]中铝郑州有色金属研究院有限公司,河南郑州450041

出　　处：《冶金分析》2023年第12期47-52,共6页Metallurgical Analysis

摘　　要：铝电解质分子比升高,电解质的初晶温度升高;相反,初晶温度降低。准确测定铝电解质分子比对生产具有重要的指导意义。在几种测定分子比的方法中,X射线衍射法(XRD)因具有制样简单、分析速度快等优点,在电解铝企业广泛应用。但随着铝电解质成分复杂化,不少企业发现X射线衍射法测定的分子比并不能指导生产,且结果与化学分析的结果差别较大。由于对X射线衍射法测定分子比的原理、影响因素等不够清楚,因此很难发现产生差别的原因。本文针对上述问题,分析了X射线衍射法测定分子比的原理,推导了X射线衍射法测定复杂铝电解质分子比的理论公式,给出了测试的物相和衍射峰。探究了测定结果不准确的原因,以期对行业发展有一定的指导作用。The initial crystal temperature of electrolyte increases with the increase of molecular ratio of aluminum electrolyte.On the contrary,the primary crystal temperature decreases.The accurate determination of molecular ratio of aluminum electrolyte has important guiding significance for the production.Among several methods of molecular ratio determination,X-ray diffraction(XRD)is widely used in electrolytic aluminum enterprises due to its advantages of simple sample preparation and fast analysis speed.However,with the complexity of aluminum electrolyte components,many companies have found that the molecular ratio determined by XRD could not well guide the production,and the determination results have great difference from those obtained by chemical analysis.Because the principle and influencing factors of molecular ratio determination by XRD are not clear enough,it is difficult to find out the reason for the difference.In view of the above problems,the determination principle of molecular ratio by XRD was analyzed.The theoretical formula for the determination of molecular ratio of complex aluminum electrolytes by XRD was derived,and the phase and diffraction peak were given.The reasons of inaccurate measurement results were investigated,which had a certain guiding role for the industrial development.

关 键 词：铝电解质 物相 分子比 X射线衍射(XRD) 氧化铝 氟化钙 

分 类 号：O657.39[理学—分析化学] TF821[理学—化学]