Attrition Behaviour of Different Crystals in Stirred Vessels at Just Of—Bottom Conditions

Attrition measurements, carried out for 8 different crystalline systems in a stirred vessel at off-bottom suspension conditions, showed that: i. 4-28% of fragments were generated in 1 hr; ii. the fragments covered the entire spectrum of sizes below that of the original crystals; iii. the fragments became more elongated as their size decreased. The size distributions were satisfactorily fitted by superimposing the effects of abrasion and breakage mechanisms, the former being largely predominant. The response of the different crystalline systems to the attrition tests carried out adopting similar suspension conditions showed that the extent of attrition suffered by each system is mainly affected by its stress resistance.