Clay separation is the process of removing clay minerals from ore, concentrate, or process streams to improve ore grade, processing efficiency, and product quality in mining operations. In bauxite mining, clay separation is essential to reduce the reactive silica content of the feed to the Bayer Process refinery, as clay minerals — particularly kaolinite — consume caustic soda and reduce alumina recovery. Clay separation in bauxite beneficiation is commonly achieved through scrubbing, screening, hydrocycloning, and wet classification to separate fine clay particles from coarser bauxite nodules. In gold mining, clay separation from ore feeds improves leach kinetics, reduces reagent consumption, and prevents blinding of screening panels and carbon adsorption systems in CIP/CIL circuits. In iron ore processing, clay separation through wet screening, hydrocycloning, and attrition scrubbing is critical to achieving the iron grade and silica content specifications required by steel producers. In diamond mining, clay separation from kimberlite ore is a priority to expose diamond surfaces and prevent clay coating that would interfere with XRT, grease belt, and optical sorter recovery systems. Effective clay separation requires thorough scrubbing to break down clay aggregates, sufficient water addition to achieve adequate dispersion, and appropriate classification equipment to achieve a clean separation. Dispersants and surfactants are sometimes added to enhance clay deflocculation and improve separation efficiency.
