RECOVERY METHOD OF VALUABLE METAL

• Main Authors: TSUSHIMA TAKU, O SHORIN, URATA KENTARO
• Format: Patent
• Language: English; Japanese
• Published: 24.09.2021
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; DISPOSAL OF SOLID WASTE; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PERFORMING OPERATIONS; PRETREATMENT OF RAW MATERIALS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; PRODUCTION AND REFINING OF METALS; RECLAMATION OF CONTAMINED SOIL SOIL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide a recovery method of a valuable metal from a material recovered from secondary batteries, which can prevent an increase of an operating temperature in a furnace, can recover at low cost and can improve the yield.SOLUTION: When recovering a metal by separating the metal and an oxide after melting and separating into the metal and oxide followed by cooling, after reducing and metalizing Ni, Co in the mixture by forming a molten slag by heat to 1498°C, by adding a flux and a reducing agent in which any one or more kinds of CaO and CaCO3 and SiO2 are contained into recovered material containing Ni, Co obtained by treating the used secondary batteries, a composition of liquid slag satisfies "2.64≤R-C×12÷16≤13.8", "0.73-4.48×[A]≤[B](0≤[A]<0.12)", "0.32-0.1×[A]≤[B](0.12≤[A]<0.32", "-0.24+0.76×[A]≤[B](0.32≤[A]≤0.84", and [B]≤1.2-1.0×[A](0≤[A]≤0.84).SELECTED DRAWING: Figure 1 【課題】炉内の操業温度の上昇を防ぎ、低コストで回収し、歩留まりを向上できる二次電池の回収物からの有価金属の回収方法を提供する。【解決手段】使用済みの二次電池を処理して得たNi,Coを含む回収物にCaO,CaCO3のいずれか１種以上及びSiO2が含まれるフラックスと還元剤を添加し、1498℃以上で加熱し溶融スラグを形成し混合物中のNi,Coを還元し金属化した後、金属と酸化物に溶融分離し冷却後に金属と酸化物を分離して金属を回収するにあたり、溶融スラグの組成が「2.64≦R-C×12÷16≦13.8」,「0.73-4.48×[A]≦[B](0≦[A]＜0.12)」,「0.32-0.1×[A]≦[B](0.12≦[A]＜0.32)」,「-0.24+0.76×[A]≦[B](0.32≦[A]≦0.84)」,「[B]≦1.2-1.0×[A](0≦[A]≦0.84)」を満たす。【選択図】図１