Particle size refers to the physical dimension of individual mineral or rock fragments within a processed material stream, usually measured in microns or millimeters and represented as an equivalent spherical diameter. Particle size is a foundational parameter across all stages of mining and mineral processing. In bauxite mining, particle size affects digestion kinetics in the Bayer process, with finer particles reacting faster but requiring more energy to achieve. In gold mining, particle size determines the appropriate recovery method, since coarse gold responds to gravity concentration while fine or refractory gold requires finer grinding and chemical leaching. In iron ore operations, particle size dictates whether ore can be sold as lump product or must be processed into sinter feed or pellet feed, each commanding different market prices. In diamond mining, particle size is critical because different recovery technologies are effective across different size ranges, and preserving the integrity of larger, more valuable stones requires careful control of crushing to avoid breakage. Particle size is measured using techniques such as sieve analysis, laser diffraction, or image analysis. Controlling particle size throughout the comminution circuit, from primary crushing to final grinding, is essential for achieving target liberation, optimizing energy consumption, and meeting downstream processing and product specifications.
