Provided is a granular activated carbon which has a filtered flow rate of a predetermined value or higher, and a high water purification performance; and a method for manufacturing the same. A granular activated carbon comprises a plurality of activated carbon granules and a binder for binding the plurality of activated carbon granules, wherein the binder is composed of net-like fibers. Also, a method for manufacturing the granular activated carbon includes a step for spraying and drying slurry which is obtained by dispersing the activated carbon granules and the fibers in water.

Provided is a granular activated carbon which has a filtered flow rate of a predetermined value or higher, and a high water purification performance; and a method for manufacturing the same. A granular activated carbon comprises a plurality of activated carbon granules and a binder for binding the plurality of activated carbon granules, wherein the binder is composed of net-like fibers. Also, a method for manufacturing the granular activated carbon includes a step for spraying and drying slurry which is obtained by dispersing the activated carbon granules and the fibers in water.

A process for producing activated carbon includes carbonizing an organic material to produce a charcoal, heating the charcoal in a chamber in the presence of oxygen at a temperature in the range of 400 to 500 C. for a duration of time sufficient to produce the activated carbon, and removing the charcoal from the heat once the activated carbon is formed.

An activated carbon slurry supply method comprises: a step A of obtaining activated carbon slurry containing ground activated carbon and raw material water, the step A including, in any order, a step A1 of grinding raw material activated carbon in a grinder to prepare the ground activated carbon having a smaller particle size than a particle size of the raw material activated carbon, and a step A2 of mixing either the raw material water and the raw material activated carbon or the raw material water and the ground activated carbon in a mixer; a step B of conveying the activated carbon slurry to a point of mixing with dilution water or a point of mixing with water to b e treated; and a step C of adding an acid at least before end of the step A.

An activated carbon slurry supply method comprises: a step A of obtaining activated carbon slurry containing ground activated carbon and raw material water, the step A including, in any order, a step A1 of grinding raw material activated carbon in a grinder to prepare the ground activated carbon having a smaller particle size than a particle size of the raw material activated carbon, and a step A2 of mixing either the raw material water and the raw material activated carbon or the raw material water and the ground activated carbon in a mixer; a step B of conveying the activated carbon slurry to a point of mixing with dilution water or a point of mixing with water to b e treated; and a step C of adding an acid at least before end of the step A.

A system and method for producing a coal product from a carbon source material. The coal product may include a green carbon foam, a finished carbon foam, and/or a coal siding product. The system and method for producing a green carbon foam may involve pulverizing the carbon source material prior to processing the pulverized carbon source material to produce the green carbon foam using a float bath or an extruder. During production of the green carbon foam, the temperature of the float bath or extruder may be maintained at a temperature determined relative to the Gieseler fluidity properties of the carbon source material used.

Provided is an additive for nonaqueous electrolyte secondary battery positive electrodes, which can improve the electrical conductivity of electrodes, decrease the resistance of electrodes, and increase the use efficiency of cation species such as lithium ions, sodium ions, various quaternary ammonium salts, and phosphonium salts. The additive includes a carbonaceous material having a specific surface area as determined by the BET method of from 1,000 m.sup.2/g to 2,000 m.sup.2/g, a micropore volume as determined by the DFT method of less than 0.60 cm.sup.3/g, and an oxygen content as measured by elemental analysis of 0.5% by mass or more and less than 1.3% by mass.

Provided is an additive for nonaqueous electrolyte secondary battery positive electrodes, which can improve the electrical conductivity of electrodes, decrease the resistance of electrodes, and increase the use efficiency of cation species such as lithium ions, sodium ions, various quaternary ammonium salts, and phosphonium salts. The additive includes a carbonaceous material having a specific surface area as determined by the BET method of from 1,000 m.sup.2/g to 2,000 m.sup.2/g, a micropore volume as determined by the DFT method of less than 0.60 cm.sup.3/g, and an oxygen content as measured by elemental analysis of 0.5% by mass or more and less than 1.3% by mass.

A process for producing activated carbon includes carbonizing an organic material to produce a charcoal, heating the charcoal in a chamber in the presence of oxygen at a temperature in the range of 400 to 500 C. for a duration of time sufficient to produce the activated carbon, and removing the charcoal from the heat once the activated carbon is formed.

Disclosed herein is a method for preparing coal-based, briquetted activated carbon. The method includes subjecting raw coal to a briquetting process, pulverizing the briquettes into particles, and performing carbonization and activation to obtain activated carbon. The briquetting process includes pulverizing raw coal to produce a feed, feeding the feed into a feed bin for degassing, adjusting the temperature and the water content of the feed in the feed bin, and feeding the feed in the feed bin into a briquetting apparatus for briquetting to form coal briquettes. The raw coal briquetting process of the preparation method is suited to a wide variety of coal, including non-caking coal. The preparation method yields a coal briquette product with a strength greater than 89% without any binder, which is beneficial to improve the strength and the like of activated carbon.