Combined effect of abrasion and corrosion on the wear of cast iron grinding balls with chromium contents from 12 to 30%

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Abstract:
 
The wear rates of high chromium cast iron grinding balls were measured in an ore grinding pilot-plant, simulating the operation of an industrial plant producing finely ground iron ore used as pellet feed. Iron ores with silica contents of 2 and 7% were used in the tests. The pH of the process water was either 7.2 or 8.5. In the higher pH condition, the lowest wear rate was obtained for a 24%Cr-3.0%C alloy, with high percentage of eutectic carbides in the microstructure. In the more corrosive environment, at pH 7.2, the best performance was shown by a 30%Cr -2.2%C alloy in spite of its lower carbide content and lower hardness. Comparing tests at pH 7.2, the increase of the silica content from 2 to 6% resulted in higher wear rates for all alloys and markedly reduced the performance difference among the various alloys. This result was attributed to the predominance of the abrasion effect over the corrosion effect.

Reference:
ALBERTIN, Eduardo; MORAES, Sandra Lucia de.; ZEITUNE, Camila Peres Massola. Combined effect of abrasion and corrosion on the wear of cast iron grinding balls with chromium contents from 12 to 30%. In: INTERNATIONAL BRAZILIAN CONFERENCE ON TRIBOLOGY, 1., 2010, Rio de Janeiro. Proceedings… 12p.

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