METHOD FOR RESOURCE RECYCLING OF NICKEL-IRON ALLOY AND USE THEREOF

• Main Authors: HE, Fang, SHEN, Zhixin, CHEN, Ruokui, RUAN, Dingshan, QIAO, Yanchao, DENG, Haozhen, LI, Changdong
• Format: Patent
• Language: Chinese; English; French
• Published: 11.08.2022
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; FERROUS OR NON-FERROUS ALLOYS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

A method for resource recycling of a nickel-iron alloy and use thereof. The method comprises the following steps: (1) ball-milling, pulverizing, and sieving a nickel-iron alloy to obtain a nickel-iron alloy powder; (2) leaching the nickel-iron alloy powder with an acid solution, heating and stirring, and filtering to obtain a leaching solution and a leaching residue; (3) adding a phosphorus source to the leaching solution, mixing and stirring, heating, and filtering to obtain iron phosphate and a post-precipitation solution; and (4) adding a neutralizing agent to the post-precipitation solution, heating and stirring, and filtering to obtain a nickel-containing solution. After the nickel-iron alloy is dissolved using the acid solution, iron phosphate is prepared under the effects of the phosphorus source or the phosphorus source plus an oxidant, and a precipitation aid. Further, a lithium iron phosphate positive electrode material can be prepared by using iron phosphate as a precursor of lithium iron phosphate