FIRED PRODUCT, AND PRODUCTION METHOD THEREOF

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PROBLEM TO BE SOLVED : To provide a useful product being a fired product which is obtained by using an acidic residue to be generated when rare earth-containing mud is treated with an acid, and to provide a production method of the useful product. SOLUTION : Aggregate comprises the fired product obtained by firing the acidic residue to be generated when rare earth-containing mud is treated with the acid. The aggregate can have 1, 000 N or higher crushing strength. The aggregate is obtained, for example, by molding an acidic residue-containing raw material for aggregate into a pellet and firing the pellet. It does not matter if only the acidic residue is used as the raw material for aggregate or a combination of the acidic residue with another raw material such as lime is used as the raw material for aggregate. COPYRIGHT : (C)2015, JPO&INPIT