Method for extracting and recovering nickel from nickel-containing waste capacitor material and preparing nickel product

• Main Authors: WANG MENGCHENG, HE JIAN, YANG KANG, LIU SIQI, XU YUEBING, HU KEWEI, WANG JINHU, YAO LIWEI, QIN WENQING
• Format: Patent
• Language: Chinese; English
• Published: 20.05.2022
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a method for extracting and recovering nickel from a nickel-containing waste capacitor material and preparing a nickel product. When the nickel product is nickel carbonate, the method comprises the following specific preparation steps: leaching and oxidizing by sulfuric acid and an oxidizing agent, removing impurities by an alkaline impurity removing agent, precipitating by a sodium carbonate solution, filtering and washing to obtain a nickel carbonate product with the nickel content greater than or equal to 45%. When the nickel product is the high-purity nickel sulfate solution, the specific preparation steps comprise high-temperature roasting, sulfuric acid leaching, nickel-containing pH regulator adjustment and solution purification, and the high-purity nickel sulfate solution is obtained. The method has the following beneficial effects: (1) the extraction efficiency of nickel is high, and a technical route can be selected according to the actual demand of a product; (2) the process