Understanding the Many Uses of Flake Graphite
What is Flake Graphite?
The term "flake graphite" refers to a type of natural graphite that is identified by its distinct "flaky" or platy structure. It typically occurs as very small, flat, platelet-like crystallite particles that easily break along planes of cleavage. This platy structure is what distinguishes it and allows it to be used for various applications that require this characteristic flake shape.
Formation and Deposits
Flake Graphite forms through metamorphism of organic matter like coal in high-grade metamorphic rocks at temperatures between 700-1,100°C. The largest known deposits of it in the world are located in China, Brazil, Canada, and Madagascar. Its deposits are found in discrete veins or disseminated deposits within host rocks like schist, gneiss and marble. Flake particles range in size from micrometers to over a millimeter in diameter. Purity and flake size distribution are important factors that determine the end uses for different deposits.
Purification and Processing
Raw ores require processing to upgrade the purity and flake quality. Initially, the ore undergoes liberation processes like grinding, washing and flotation to separate graphite flakes from waste gangue minerals. Further purification is done by thermal treatment that involves heating the concentrate in air at temperatures between 500-1,000°C. This removes volatile compounds and increases the carbon content. The purified flakes are then graded and sized into different size fractions through screening.
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