METHOD FOR THE SURFACE PURIFICATION OF A GRAPHITE CONTAINING IMPURITIES USING A DILUTE AQUEOUS SOLUTION OF NH4F AND H2SO4

摘要

Process for preparing particles of graphite that are purified in surface, from particles of an impure graphite, this process comprises at least one step of treating particles of graphite by means of a diluted aqueous solution of (H₂SO₄ and NH₄F), H₂SO₄ and NH₄F each being present in the diluted aqueous solution at a weight content representing from 5 to 30% of total weight of the aqueous solution, the quantity of diluted aqueous solution representing from 70 to 95% of the weight of the particles of graphite that undergo purification.