Kaolin deposits occuring in sedimentary rocks are generally classified as secondary or sedimentary. Some may have formed by the transportation and deposition of kaolinite formed elsewhere. However, diagenetic and weathering processes appear to play an important role in the in situ formation and modification of sedimentary koalins. Deposits often contain in excess of 60% kaolinite. Lower concentrations occur in kaolinite sand, formed by the in situ alteration of feldspathic sandstones.
Kaoline Sand Processing Operation
The two principle objectives of kaolinite sand processing are the removal of impurities and the production of desired particle size distribution. Air floated kaolins are produced for low grade applications. However, most kaolin is processed by wet classification involving the separation of fine platy kaolinite from coarser quartz, feldspar and mica.
Althrough kaolinite is concentrated in the fine fraction, the mineral also occurs in the coarser size fractions. Treatment of centrifuge underflow by ultraflotation recovers coarse kaolinite, which after sand grinding produces filler or coating grade clays depending on residence times. Operation of sand grinding in closed circuit with a hydrocyclone results in products with well controlled particle sizes.
Kaolinite Sand Processing Plant
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