Certains contenus de cette application ne sont pas disponibles pour le moment.
Si cette situation persiste, veuillez nous contacter àObservations et contact
1. (WO2019063354) CONCENTRATION DE PARTICULES DE GRAPHITE PAR AGGLOMÉRATION AVEC DES PARTICULES MAGNÉTIQUES HYDROPHOBES
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

Claims

1 . A process for concentrating graphite particles comprising

providing a feedstock which contains the graphite particles and an undesired material,

adding hydrophobic magnetic particles to the feedstock which results in a loaded feedstock containing agglomerates of the magnetic particles and the graphite particles, and

c) separating the agglomerates from the loaded feedstock by a magnetic field which results in isolated agglomerates.

The process according to claim 1 further comprising d) breaking up the isolated agglomerates to obtain the magnetic particles and the graphite particles separately.

The process according to claims 1 or 2 wherein the feedstock is a dispersion, preferably an aqueous dispersion.

The process according to any of claims 1 to 3 wherein the feedstock further contains a collector, which selectively forms a hydrophobic layer on the graphite particles.

The process according to claim 4 wherein the collector is a hydrocarbon selected from mineral oils, vegetable oils, biodiesel, BtL (Biomass-to-Liquid) fuels, products of coal liquefaction, products of the GtL (Gas to Liquid, from natural gas) process, long chain alcohols, and mixtures thereof.

6. The process according to claim 4 or 5 wherein the feedstock comprises 0.1 to 10 wt% of the collector, based on dry mass of the feedstock.

7. The process according to any of claims 1 to 6 wherein the feedstock comprises 5 to 99 wt% graphite.

8. The process according to any of claims 1 to 7 wherein the magnetic particles are added to the feedstock in an amount of from 0.01 to 100% by weight, preferably from 0.1 to 20% by weight, particularly preferably from 0.5 to 10 % by weight, based on the weight of the dry graphite particles and undesired material.

9. The process according to any of claims 1 to 8 wherein the feedstock is based on natural graphite ore, electronic scrap, or battery scrap.

10. The process according to any of claims 1 to 9 wherein the undesired material comprises a hydrophilic metal compound or a hydrophilic semimetal compound.

1 1 . The process according to any of claims 1 to 10 wherein the feedstock is subjected to a magnetic separation to remove a magnetic or magnetizable material.

12. The process according to any of claims 1 to 1 1 wherein the concentration of the graphite particles in the feedstock is increased by the process by a factor of 1.1. to 100.

13. The process according to any of claims 1 to 12 wherein the hydrophobic magnetic

particles are hydrophobized by treatment with a hydrophobizing agent selected from polyorganosiloxanes, alkylsiliconates, alkyltrichlorosilanes, alkyltrimethoxysilanes, alkylphosphonic acids, mono- or dialkylphosphoric esters, fatty acids, or mixtures thereof.

The process according to any of claims 1 to 13 wherein the graphite particles have average diameter D5o of 1 nm to 1 mm.

The process according to any of claims 1 to 14 wherein the magnetic particles comprise magnetic metals, ferromagnetic or ferrimagnetic alloys of magnetic metals, magnetic iron oxides, cubic ferrites; or mixtures thereof.

The process according to any of claims 1 to 15 wherein the graphite particles comprise graphite which is a hexagonal or rhombohedral crystalline, multi-layer modification of chemical element carbon.

An agglomerate as defined in any of claims 1 to 16 comprising a graphite particle, a hydrophobic magnetic particle, and a collector.