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1 000 ℃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46mL.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％.
Abstract
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 1 000 ℃,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％.
基金项目
中南大学中央高校基本科研业务费专项资金(506021721)
维普
万方数据