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