Method for producing carbon material dispersion, carbon material dispersion, and apparatus therefor

A carbon material refining apparatus comprising:

• a magnetic roll comprising a rotating hollow cylindrical element, and a magnet element, a surface of the rotating hollow cylindrical element being a contact surface with a carbon material, the magnet element comprising an arc-shaped magnetized facing surface arranged in close proximity to an inner surface of the hollow cylindrical element in an inner space of the hollow cylindrical element;
• a supply path located upstream of the rotating hollow cylindrical element of the magnetic roll, the supply path supplying the carbon material in powdered and/or granulated form;
• and
• a recovery section located downstream of the rotating hollow cylindrical element of the magnetic roll, the recovery section collecting the carbon material in powdered and/or granulated form which falls down without attaching itself to the surface of the hollow cylindrical element,
• wherein the supply path comprises a belt conveyor section which has a terminal portion near a topmost position of the magnetic roll and which conveys the carbon material in powdered and/or granulated form in an approximately tangential direction directly from the belt conveyor section to the magnetic roll.

A carbon material refining system comprising:

• an upstream-side dry refining apparatus and a downstream-side wet refining apparatus;
• the dry refining apparatus comprising a magnetic roll and a recovery section,
• the magnetic roll comprising a rotating hollow cylindrical element, and a magnet element, a surface of the rotating hollow cylindrical element being a contact surface with a carbon material, the magnet element comprising an arc-shaped magnetized facing surface arranged in close proximity to an inner surface of the hollow cylindrical element in an inner space of the hollow cylindrical element,
• the recovery section located downstream of the rotating hollow cylindrical element of the magnetic roll, the recovery section collecting the carbon material in powdered and/or granulated form which falls down without attaching itself to the surface of the hollow cylindrical element;
• and
• the wet refining apparatus comprising a magnetic filter,
• the magnetic filter comprising a magnet element arranged in a flow path of a carbon material dispersion approximately along an axial direction of the flow path, and a liquid flow passage in contact with a surface of the magnet element or a magnetic surface applied by a magnetic field of the magnet element, the carbon material dispersion passing through the liquid flow passage, with a proviso that the carbon material dispersion is prepared by dispersing the carbon material in powdered and/or granulated form, which has been applied to the dry refining apparatus and collected in the recovery section of the dry refining apparatus, in a dispersing medium.