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PURPOSE : A solidification briquette and a manufacturing method thereof are provided to have excellent initial and latter intensity expression, and to reduce manufacturing cost by using by-product steel. CONSTITUTION : A manufacturing method of solidification briquette comprises the following steps of; preparing(S1) a raw material including by-product steel, the inorganic solidifying agent of 5 to 10wt% for the by-product steel 100wt%, and the organic binder of 6 to 12wt%; mixing(S2) the raw material by putting water to the raw material; obtaining(S3) briquette by compression-molding the mixed raw material; and curing(S4) the briquette. The inorganic solidifying agent is blast furnace slag powder and slag cement. The blast furnace slag powder has the weight ratio of 0.25 to 4.0 for slag cement. [Reference numerals] (S1) Material preparing step; (S2) Material mixing step; (S3) Compression molding step; (S4) Curing step