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(57) Abstract: The coal was pulverized, and an ultrafine coal is finely dispersed, by weight average particle diameter (average particle diameter d 50) is in the range of 0.01~1μm Amplify the activity of coal, perform light absorption heat conversion and high rate heat absorption, and provide useful applications as far infrared radiation materials. SOLUTION: The coal powder raw material is further converted into ultrafine coal using a bead mill 1. The bead mill 1 includes a central rotating shaft 2, a rotor 3 connected thereto, and a stator 4 as a fixing member. The blades 6 are provided alternately at facing positions. The mixture of the coal powder raw material and water is supplied from the supply port 5 together with a zirconia bead (about 0.3 to 0.5 mm in diameter), and is finely pulverized while passing between the rotor 3 and the stator 4 and between the blades 6. The product is taken out from the product take-out port 7. If a single pass is not sufficient, pass multiple times. |