Preparation method for aluminium nitride

• Main Authors: Liu Yongqi, Li Changdong, Gong Qinxue, Cai Haibing, Liu Wei
• Format: Patent
• Language: English; Hungarian
• Published: 28.06.2024
• Subjects: APPARATUS THEREFOR; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; COMPOUNDS THEREOF; ELECTRICITY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS; FERROUS OR NON-FERROUS ALLOYS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PRETREATMENT OF RAW MATERIALS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The present invention relates to the field of recycling of waste lithium batteries. Disclosed is a preparation method for aluminum nitride. The preparation method comprises the following steps: adding a sodium hydroxide solution to waste positive electrode powder for reaction, and performing solid-liquid separation to obtain a sodium aluminate solution and positive electrode powder; adding acid to the sodium aluminate solution for reaction, performing solid-liquid separation, and extracting a solid phase to obtain an aluminum hydroxide precipitate; performing water washing and sieving on a negative current collector, performing solid-liquid separation, extracting a solid phase, and adding nitric acid for reaction, and performing solid-liquid separation to obtain a graphite material and copper nitrate; mixing the aluminum hydroxide precipitate with the graphite material, granulating the mixture, and then adding copper nitrate for mixing, and performing a calcination reaction to obtain aluminum nitride and copper oxide. According to the present invention, nitrogen does not need to be additionally conveyed in the aluminum nitride synthesis process, and a self-sufficiency state is always kept in the reaction process, so that the reaction is more stable, and the purity of the generated aluminum nitride is high.