RECYCLING METHOD OF OIL-CONTAINING SLUDGE

PROBLEM TO BE SOLVED: To provide a recycling method of an oil-containing sludge capable of collecting iron component of the oil-containing sludge at low cost with good yield and also achieving reduction of oil component concentration of exhaust gas from a recycling facility and enhancement of sinter efficiency of sinter raw materials for blast furnace.SOLUTION: The recycling method of an oil-containing sludge is a method for recycling the oil-containing sludge ejected in a steel making process as a part of sinter raw materials for blast furnace and includes a process of mixing caustic lime with the oil-containing sludge so that a moisture content becomes 1 mass% or less, a process of mixing and burning a powder body obtained in the mixing process with fuel by a downward flame burner and blowing it on a sinter raw material layer after ignition of a Dwight Lloyd type sintering machine, where average distance H between the burner and the sinter raw material layer in the blowing process is over 150 mm, flame temperature T of the burner is over 1,300°C and ratio of calorie Qg per unit time of combustion exhaust gas of the burner to calorie Qm needed for increasing temperature of the oil and fat sludge supplied per unit time to the melting point is over 3.2.SELECTED DRAWING: Figure 3 【課題】低コストで歩留まりよく含油スラッジの鉄分を回収でき、かつリサイクル設備からの排ガスの油分濃度の低減及び高炉用焼結原料の焼結効率の向上が可能な含油スラッジのリサイクル方法の提供を目的とする。【解決手段】本発明の含油スラッジのリサイクル方法は、製鋼工程で排出される含油スラッジを高炉用焼結原料の一部としてリサイクルする方法であって、含油スラッジに生石灰を含水率が１質量％以下になるよう混合する工程と、混合工程で得られた粉体を下向き火炎のバーナーで燃料と混焼し、ドワイトロイド式焼結機の着火後の焼結原料層上に吹き付ける工程とを備えており、吹き付け工程におけるバーナーと焼結原料層との平均距離Ｈを１５０ｍｍ超、バーナーの火炎温度Ｔを１，３００℃超、単位時間当たりに供給される含油スラッジを融点まで昇温するために必要な熱量Ｑｍに対するバーナーの燃焼排ガスの単位時間当たりの熱量Ｑｇの比が３．２超である。【選択図】図３