Strategies for processing heat-sensitive materials
This article assesses strategies for controlling or reducing the heat generated when milling and classifying heat-sensitive materials that are soft, exothermic, hygroscopic, or have a low melting point. Information is included on both mill design options and engineered systems that chill process air or change material fracture characteristics to enable cryogenic grinding.
In size reduction processes, excess heat causes three problems: [1] the softening or melting of process material, [2] the start of exothermic reaction or combustion, and [3] the loss of a volatile component within the process material.