石灰活性度对铝土矿拜耳法溶出影响的机理  

Influencing Mechanism of Lime Activity for Digestion of Bauxite by Bayer Process

作　　者：刘安 陈文汨 张艳军 汪旺 LIU An;CHEN Wenmi;ZHANG Yanjun;WANG Wang(School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083

出　　处：《矿冶工程》2024年第4期229-233,共5页Mining and Metallurgical Engineering

基　　金：中南大学中央高校基本科研业务费专项资金(506021721)。

摘　　要：探究了影响石灰活性的因素及原因,并阐述了石灰活性影响铝土矿溶出性能的机理。结果表明,石灰石粒度以及煅烧温度是影响石灰活性的重要因素,煅烧温度1000℃下,石灰的活性度高达33.5 mL,石灰石粒度增至17.5~22.5 mm时,石灰的活性度增至46 mL。扫描电子显微镜分析结果表明,高活性石灰为蜂窝状、粒度均匀的细小颗粒,颗粒孔隙发达,且形成了相互贯通的孔通路。铝土矿溶出实验结果表明,石灰的活性及其添加量会影响铝土矿的溶出率和赤泥的物相组成,在C/S比1.0条件下添加高活性石灰,铝土矿相对溶出率高达98.12%。The factors and reasons influencing lime activity are presented,and the influencing mechanism of lime activity for digestion performance of bauxite is also expounded.It is found that the particle size of limestone and calcination temperature are two important factors influencing activity of lime.At a calcination temperature of 1000℃,the activity of lime is as high as 33.5 mL,while with the particle size of limestone increased to 17.5-22.5 mm,the activity of lime increases to 46 mL.The analysis results of scanning electron microscopy show that highly active lime has fine particles with uniform particle size and in a structure of honeycomb with well-developed and interconnected pores.The experiment of bauxite digestion shows that the activity of lime and its adding amount will bring influence to the digestion rate of bauxite and the phase composition of red mud.By adding highly active lime with a C/S ratio of 1.0,the relative digestion rate of bauxite is as high as 98.12%.

关 键 词：铝土矿 拜耳法 石灰 活性度 溶出 

分 类 号：TF111[冶金工程—冶金物理化学]