三水铝石矿与纯三水铝石的常压碱溶动力学与溶出机理

结合X射线衍射和扫描电镜技术,对三水铝石矿与纯三水铝石的晶体结构和微观形貌进行对比,并对其在常压和Na OH溶液中的溶出动力学和溶出机理进行系统研究。结果表明,与纯三水铝石相比,铝土矿中三水铝石的单晶颗粒较小,而晶面间距较大。二者上述结构差异性导致矿石中三水铝石晶体缺陷较多,在碱溶液中溶解时需要克服的能量较低。建立三水铝石矿与纯三水铝石的溶出动力学方程,计算得到其溶出表观活化能分别为99.144和115.149 k J/mol。...

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Published in中国有色金属学报：英文版 Vol. 25; no. 12; pp. 4151 - 4159
Main Author 杨会宾 潘晓林 于海燕 涂赣峰 孙俊民
Format Journal Article
LanguageEnglish
Published 2015
Subjects
三水铝石
动力学
拜耳法
晶体结构
溶解
Online AccessGet full text
ISSN1003-6326

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Summary:结合X射线衍射和扫描电镜技术,对三水铝石矿与纯三水铝石的晶体结构和微观形貌进行对比,并对其在常压和Na OH溶液中的溶出动力学和溶出机理进行系统研究。结果表明,与纯三水铝石相比,铝土矿中三水铝石的单晶颗粒较小,而晶面间距较大。二者上述结构差异性导致矿石中三水铝石晶体缺陷较多,在碱溶液中溶解时需要克服的能量较低。建立三水铝石矿与纯三水铝石的溶出动力学方程,计算得到其溶出表观活化能分别为99.144和115.149 k J/mol。
Bibliography:Hui-bin YANG,Xiao-lin PAN,Hai-yan YU,Gan-feng TU,Jun-min SUN（ 1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China, 2. Datang International High Aluminum Coal R＆D Center （National Energy Sources High Aluminum Coal Development and Utilization Key Laboratory）, Ordos 010321, China）
gibbsite; crystal structure; dissolution; kinetics; Bayer process
The crystal structure, morphology, dissolution kinetics and mechanism of gibbsitic bauxite and pure gibbsite in Na OH solution under atmospheric pressure were systematically investigated by XRD and SEM. The results show that the size of single crystal of gibbsite in gibbsitic bauxite is smaller than that in pure gibbsite, but the interplanar distance is larger than that of pure gibbsite, which result in more defects in the crystal and less energy needed to dissolve in alkaline solution for the gibbsitic bauxite. The dissolution kinetic equations of gibbsitic bauxite and pure gibbsite were established, and the corresponding activation energies were calculated to be 99.144 and 115.149 k J/mol, respectively.
43-1239/TG
ISSN:1003-6326