Abstract
Attrition of granular salt (NaCl) in a powder blender has been found to be strongly influenced by varying the air humidity. Systematic studies revealed a significant reduction in attrition, up to an order of magnitude, for the material which was covered with a thin lubricating layer of moisture compared with dry material. Introduction of artificial lubrication by covering the surface of dry particles with a solid lubricant (MoS 2 or talcum powder) confirmed the lubricating effect and its order of magnitude, both in a powder blender and in an annular attrition cell. The effects are quantified in terms of coefficients of the Gwyn formulation of attrition rates. The reduction in attrition attributed to the increased inter-particle lubrication is corroborated by an independent test in which a rod penetrates a bed of particles.
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