Mechanism of slag pellets sticking on the wall of reduction pot in magnesium production by Pidgeon process  

作　　者：Jilei Xu Jinhui Liu Dong Guo Mao Chen Peixu Yang Rongbin Li Shaojun Zhang 

机构地区：[1]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China [2]Henan Province Industrial Technology Research Institute of Resources and Materials,Zhengzhou University,Zhengzhou 450001,China [3]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Journal of Magnesium and Alloys》2024年第6期2397-2412,共16页镁合金学报（英文）

基　　金：funded by the China Postdoctoral Sci-ence Foundation(Grant No.2020M682337);Certificate of Postdoctoral Research Grant in Henan Province(Grant No.201903011);National Key Research and Development Program of China(Grant Nos.2016YFB0301001 and 2016YFB0301101).

摘　　要：In the preparation of magnesium by Pidgeon process,the phenomenon slag pellets sticking on the wall of reduction pot always appear,and the glaze sticking on the inner wall of the reduction pot is difficult to remove.The mechanism of this phenomenon is studied in this work by X-ray fluorescence spectrometer(XRF)measurement,electron probe microanalyzer scanning(EPMA)analysis,differential scanning calorimetry(DSC)analysis,and thermodynamic calculations.The main components of the glaze are MgO,Ca_(12)Al_(14)F_(2)O_(32),CaF_(2),CaO,and a small amount of Ca_(4)Si_(2)O_(7)F_(2).The solid-liquid transition temperature of Ca_(12)Al_(14)F_(2)O_(32)and CaF_(2)is close to the production temperature of Pidgeon process,which leads to the bonding between the slag pellets and the pot wall.The loss of CaF_(2)in glaze layer will reduce the total amount of liquid phase and increase the temperature at which Ca_(12)Al_(14)F_(2)O_(32)is completely transformed into liquid phase,which causes glaze layer sticking on the inner wall of the reduction pot.

关 键 词：Pidgeon process GLAZE Ca_(12)Al_(14)F_(2)O_(32) CaF_(2) Solid-liquid transition 

分 类 号：TG146.22[一般工业技术—材料科学与工程]