EARTHWORK MATERIAL AND MANUFACTURING METHOD THEREOF

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PROBLEM TO BE SOLVED : To provide an earthwork material that is an earthwork material using a residue generated after a treatment of mud containing rare earths with an acid, and that has excellent handling properties (for example, handling easiness and moldability during operations such as granulation) in the manufacturing process of the earthwork material, does not cause explosion of granulated product (earthwork material in the manufacturing process) during sintering, further has a wide sintering temperature for obtaining the earthwork material (sintered product) having favorable properties, and has easy sintering properties. SOLUTION : A particulate earthwork material obtained by sintering a granulated material formed of a mixture containing a residue generated after an acid treatment of mud containing rare earths and coal ash. A manufacturing method of the particulate earthwork material includes a mixing step for obtaining a mixture by mixing the residue and the coal ash, a step of obtaining a granulated product by granulating the mixture, and a step of obtaining an earthwork material by sintering the granulated product at 1, 150-1, 300°C. SELECTED DRAWING : None COPYRIGHT : (C)2017, JPO&INPIT