A wet process for the beneficiation of a fly ash by-product has the following steps: a) forming a slurry mixture of a fly ash material and a liquid; b) gravitationally separating and collecting a first material fraction of the fly ash having a density less than the liquid by skimming off floating slurry material; c) separating a first magnetic fraction from the slurry by subjecting the slurry to a magnetic field of from about 300 gauss to about 10 kilogauss; d) separating the unburned carbon from the remaining slurry components by adding an effective amount of an oil having a carbon chain greater than octane, and a frothing agent whereby the oil coats the unburned carbon forming hydrophobic carbon materials and inducing air into the system for frothing the slurry mixture wherein the hydrophobic unburned carbon froths to the surface and is removed by skimming off the frothing layer; and e) collecting the remaining fraction of silicate spheres and silicates.

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Wet process for fly ash beneficiation

An improved froth flotation method is provided for the removal and recovery of an ultra-fine constituent such as carbon from tailings such as fly ash. A flotation apparatus is utilized that preferably includes a slurry conditioning tank and a flotation cell. The method of the present invention comprises the improvement of utilizing a flotation reagent formulation comprising a mixture of fuel oil and petroleum sulfonate. The method broadly includes the steps of (1) producing a slurry, or solid suspension, of the material containing the constituent to be recovered by adding a preselected amount of water or other slurrying liquid; (2) adding the flotation reagent comprising a mixture of fuel oil and petroleum sulfonate to the slurry that renders the selected constituent hydrophobic; (3) aerating the conditioned slurry; (4) recovering the selected ultra-fine constituent from an upper portion of the flotation apparatus; and (5) withdrawing and recovering tailings from a lower portion of the flotation apparatus.

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Method of removing carbon from fly ash

Process for the treatment of industrial and/or household waste, in which the said waste is subjected to a thermolysis or pyrolysis stage, characterised in that it additionally comprises a stage of separation of the inorganic inert matter from the carbonaceous matter (to be recovered) by the difference in their hydrophobic nature.

Process and plant for the treatment and recovery of industrial and/or household waste

Unconverted char in a mixture of particles formed in the partial oxidation of an ash-containing solid fuel is recovered by grinding the mixture and subjecting the ground material to froth flotation

Recovery of particles rich in carbon from aqueous suspensions containing same

L'INVENTION SE RAPPORTE A LA SEPARATION DE PARTICULES A HAUTE TENEUR EN CENDRES A PARTIR DE PARTICULES A HAUTE TENEUR EN MATIERE CHARBONNEUSE, CES PARTICULES AYANT ETE PRODUITES PAR OXYDATION PARTIELLE D'UN COMBUSTIBLE CHARBONNEUX SOLIDE. LE PROCEDE CONSISTE A BROYER LES PARTICULES POUR DIMINUER LEUR TAILLE ET A SOUMETTRE LA MATIERE BROYEE A UN TRAITEMENT DE FLOTTATION PAR MOUSSAGE POUR OBTENIR UNE FRACTION DE FLOTTATION DES PARTICULES RICHES EN CARBONE. SELON UN MODE DE REALISATION PREFERE DE L'INVENTION, CES PARTICULES D'UNE TAILLE SUPERIEURE A 0,84MM SONT ELIMINEES DE LA SUSPENSION ET LES PARTICULES RESTANTES SONT BROYEES PUIS SOUMISES A LA FLOTTATION PAR MOUSSAGE.

Corbeels Roger Jean

Papers

Recovery of particles rich in carbon from aqueous suspensions containing same

Procede de separation de particules riches en carbone a partir de particules produites par oxydation partielle d'un combustible charbonneux solide