METHOD FOR SEPARATING MANGANESE AND NICKEL

• Main Authors: WATANABE KEN, AZUMA DAIKI, MIYAZAKI HIDEKI, SMITH RICHARD LEE JR
• Format: Patent
• Language: English; Japanese
• Published: 01.03.2021
• Subjects: CHEMISTRY; DISPOSAL OF SOLID WASTE; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PERFORMING OPERATIONS; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; RECLAMATION OF CONTAMINED SOIL SOIL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide a method for separating manganese and nickel in which manganese and nickel can be separated from a material containing lithium metal oxide containing manganese and nickel safer and at a lower cost than conventional ones.SOLUTION: A method for separating manganese and nickel from a material containing lithium metal oxide containing manganese and nickel comprises a leaching process in which hydrothermal organic acid leaching treatment is performed to the material by using aqueous solution complex-forming organic acid, in which the leaching process includes: (a) a process of setting the temperature of the aqueous solution to 65°C or higher and 85°C or lower, and leaching the manganese from the material into the aqueous solution; and (b) a process of setting the temperature of the aqueous solution to higher than 85°C and 110°C or lower, and leaching the nickel from a solid obtained by performing liquid phase separation to the aqueous solution having passed the process (a) into the aqueous solution.SELECTED DRAWING: Figure 2 【課題】従来よりも安全でかつ低コストで、マンガン及びニッケルを含むリチウム金属酸化物を含んだ材料からマンガン及びニッケルを分離することができる、マンガン及びニッケルの分離方法を提供する。【解決手段】マンガン及びニッケルを含むリチウム金属酸化物を含んだ材料から、前記マンガン及び前記ニッケルを分離する分離方法であって、錯体形成性有機酸の水溶液を用いて、前記材料に対して水熱有機酸浸出処理を行う浸出工程を備え、前記浸出工程は、（ａ）前記水溶液の温度を６５℃以上８５℃以下とし、前記材料から前記マンガンを前記水溶液中に浸出させる工程と、（ｂ）前記水溶液の温度を８５℃超１１０℃以下とし、前記（ａ）工程後の前記水溶液を液相分離して得られる固体から、前記ニッケルを前記水溶液中に浸出させる工程と、を含む、マンガン及びニッケルの分離方法。【選択図】図２