Size grading by air classification to prevent compaction of lime for aerial distribution

摘要

Agricultural lime (i.e. limestone rock ground into particles that will mostly pass through a 2mm sieve) is separated into coarse particles and a fine particle fraction (sub 100 micron particle size) using an air classification process, and the coarse particle fraction is used as lime for aerial topdressing that will not generally compact in the aircraft hopper as a result of aircraft vibration and can be relied on to flow freely out of the hopper when required.