PPROBLEM TO BE SOLVED: To provide a method for producing a waste oil-based solid fuel capable of utilizing a solid waste oil and/or a high viscous liquid waste oil as a fuel conveniently which has conventionally been hard or impossible to utilize as a fuel. PSOLUTION: This method for producing the waste oil-based solid fuel comprises mixing the solid waste oil and/or the high viscous liquid waste oil with a low viscous liquid waste oil and dissolving them, preparing the waste oil having a particle size of 15 mm and viscosity of 3,500 cP by use of a residual massive waste oil (a waste oil ball), and then mixing the prepared waste oil with a waste oil absorbent. PCOPYRIGHT: (C)2010,JPO&INPIT
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