FIELD: nanotechnology.
SUBSTANCE: invention can be used in deep processing of dust captured from flue gases of electrothermal production of silicon. It is repulped with water at a ratio of liquid to solid (15-20): 1 technogenic waste in the form of dust comprising carbon nanoparticles are processed with an aqueous solution of fluohydric acid with a concentration of 15-32%, neutralised with ammonia to a pH of 6.5-8.5. The pulp and the precipitation containing the nanoparticles are mechanically separated by two-stage centrifugation or two-stage filtration. The byproducts in the form of fluorinated solutions can be recycled to aluminium fluoride.
EFFECT: reduced energy costs, simplified technology of production of carbon nanoparticles, improved environment due to utilisation of previously stored wastes.
4 cl, 3 dwg, 1 tbl, 1 ex
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