A method for recycling spent carbon cathode of aluminum electrolysis includes the following steps: (1) crushing and sieving spent carbon cathode, to obtain carbon particles; (2) mixing the carbon particles with a sulfuric acid solution, to obtain a slurry A, and then performing pressure leaching, to obtain a slurry B; (3) evaporating and concentrating the slurry B until a mass percentage of water is lower than 8%, to obtain a slurry C; (4) adding concentrated sulfuric acid to the slurry C to obtain a slurry D, then roasting the slurry D at 150-300° C. for 0.5-10 h, and then roasting at 300-600° C. for 0.5-8 h, to obtain the roasted carbon; and calcining the roasted carbon at a high temperature, to obtain the purified carbon, or mixing the roasted carbon with a leaching agent, and performing leaching, filtering, and washing, to obtain the purified carbon.

Embodiments of the invention are directed to systems and methods for purifying graphite particles. Graphite flakes can be milled, and then separated into groups with different nominal sizes. The different groups of particles are purified according to optimized purification processes. Groups of purified particles with narrow size distributions are created using embodiments of the invention.

Photoreduction of graphene oxide, by UV-generated ketyl radicals, to graphene. The photoreduction is versatile and can be carried out in solution, solid-state, and even in polymer composites. Reduction of graphene oxide can take place in various polymer matrixes. Methods for producing graphene-supported metal nanoparticles by photoreduction. Graphene oxide and a metal nanoparticle precursor are simultaneously reduced by the action of photogenerated ketyl radicals. Photoreduction is performed on polymer composite films in one embodiment.

Photoreduction of graphene oxide, by UV-generated ketyl radicals, to graphene. The photoreduction is versatile and can be carried out in solution, solid-state, and even in polymer composites. Reduction of graphene oxide can take place in various polymer matrixes. Methods for producing graphene-supported metal nanoparticles by photoreduction. Graphene oxide and a metal nanoparticle precursor are simultaneously reduced by the action of photogenerated ketyl radicals. Photoreduction is performed on polymer composite films in one embodiment.

Embodiments of the present disclosure describe a method of preparing a colloidal solution comprising preparing a salted aqueous solvent and dispersing a graphitic material in the salted aqueous solvent. Embodiments of the present disclosure further describe a method of treating a graphitic material comprising agitating a graphitic material in a salted aqueous solvent and removing residual chemical species to obtain a treated graphitic material. Embodiments of the present disclosure also describe a colloidal solution comprising a liquid medium and a treated graphitic material dispersed in the liquid medium sufficient to form a colloidal solution.

Embodiments of the present disclosure describe a method of preparing a colloidal solution comprising preparing a salted aqueous solvent and dispersing a graphitic material in the salted aqueous solvent. Embodiments of the present disclosure further describe a method of treating a graphitic material comprising agitating a graphitic material in a salted aqueous solvent and removing residual chemical species to obtain a treated graphitic material. Embodiments of the present disclosure also describe a colloidal solution comprising a liquid medium and a treated graphitic material dispersed in the liquid medium sufficient to form a colloidal solution.

The invention relates to a method for producing a pre-treatment coating composition for a metal substrate, the method comprising the steps of: i. mining graphite ore from a graphite ore body; ii. subjecting the graphite ore to an electrolytic treatment to obtain an expanded graphitic material; iii. subjecting the expanded graphitic material to an exfoliation treatment to obtain single-layer graphene and few-layer graphene, and iv. functionalising the graphene with a coupling agent for coupling graphene to the metal substrate.

A system and a method of continuously separating submicron thickness laminar solid particles from a solid suspension, segregating the suspension into a submicron thickness particle fraction suspension and a residual particle fraction suspension, the method comprising the steps of; providing a continuous centrifuge apparatus; providing a suspension of submicron thickness laminar solid particles in a solid suspension; wherein the solid suspension comprises the submicron thickness solid particles in a liquid continuous phase; separating the solid suspension in the apparatus.

A system and a method of continuously separating submicron thickness laminar solid particles from a solid suspension, segregating the suspension into a submicron thickness particle fraction suspension and a residual particle fraction suspension, the method comprising the steps of; providing a continuous centrifuge apparatus; providing a suspension of submicron thickness laminar solid particles in a solid suspension; wherein the solid suspension comprises the submicron thickness solid particles in a liquid continuous phase; separating the solid suspension in the apparatus.

Disclosed is a method for purification and lattice reconstruction of graphite in a power battery, which includes the following steps: subjecting a waste power battery to discharging, coarse breaking, pyrolysis, fine breaking and sorting sequentially to obtain electrode material powder; mixing the electrode material powder with a metal extractant, standing still, then washing with a purifying agent A, filtering to obtain a filter residue A, mixing the filter residue A with the metal extractant, standing still, then washing with a purifying agent B, and filtering to obtain a crude graphite; subjecting the crude graphite to the de-organic treatment, cooling, ball milling, and ventilation replacement to obtain a primary purified graphite; and introducing a rare gas into a primary purified graphite to repair the graphite lattice.