Investigation on grinding wear behaviour of austempered ductile iron as media material during comminution of iron ore in ball mills

Abstract

An attempt has been made to assess the grinding wear behaviour of austempered ductile iron (ADI) as media material in comminution of Kudremukh haematite iron ore in a ball mill. Spheroidal graphite (S.G) iron balls were austenitised at 900ºC for one hour and austempered at 280ºC and 380ºC for different time durations. These materials were characterized by measuring hardness, carrying out X-ray diffraction analysis, studying microstructures using scanning electron microscope (SEM). Grinding wear behaviour of ADI was assessed during wet grinding at different pH of the mineral slurry. The wear resistance of ADI was compared with that of forged En 31 steel balls under similar grinding conditions. It was found that ADI balls austempered at 280ºC for 30 minutes which contains lower bainite registered superior wear resistance. It was also noted that the wear resistance of ADI was more at higher pH range of the slurry.

Corrosion behavior of austempered ductile iron (ADI) in iron ore slurry

“…There is a possibility that additional constituents could be introduced into the slurry from the grinding media balls and the chemical nature of the slurry keeps changing continuously in the mill and the slurry becomes corrosively active (Hebbar, 2011). In the absence of sliding (idle periods), the products of the corrosion will form a film on the surface, which will slow down or even arrest the corrosion.…”

Simulation on stress of large diameter CADI grinding ball based on ANSYS

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C ADI (Carbidic Austempered Ductile Iron) is a new kind of wear-resistant material developed on the basis of ADI [1] (Austempered Ductile Iron). There are many studies concerning CADI, such as on chemical composition [2][3][4][5] , microstructure [6,7] , properties [8][9][10][11] and heat treatment [12][13][14][15] .

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