Beneficiation of kish graphite
AssigneeIndresco Canada, Inc.
InventorsGeorge W. Bennett, Maxime Leduc, Jean-Guy St-Hilaire, Christian Garceau
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Abstract
A method and apparatus system are disclosed for the beneficiation of kish to produce coarse high purity graphite wherein a concentrate containing at least about 90% carbon is formed, treated with a dilute acid solution, and the pulp then subjected to an adjuvant-assisted attrition to form a novel synthetic flake graphite of 99+ wt. % carbon with at least 70% of the mass retained on +100 mesh, and an overall recovery of graphitic carbon from the feed of greater than 85% by weight.
Claims7
A method of beneficiating kish to produce flake graphite having 99%+ graphitic carbon content comprising concentrating the kish to form a graphite concentrate, screening the concentrate to collect an about +200 mesh fraction, milling said fraction at an energy level and for a time sufficient to liberate the flakes to a purity of at least about 90% carbon, screening said milled fraction to collect the remaining +200 mesh fraction, mixing said remaining +200 mesh fraction with an acid having a concentration of less than about 7.5% to form an acidic pulp, subjecting said pulp to attrition with a solid attrition adjuvant at an energy level and for a time sufficient to dislodge impurities remaining on the graphite and at least 50% by weight of the flake graphite in said graphite concentrate is recovered as a +100 mesh product, neutralizing said acidic pulp, and recovering the flake graphite from the neutralized pulp.
Dependencies are inferred from the claim text.