METHOD FOR PRODUCING BATTERY-GRADE NICKEL SULFATE BY MEANS OF LATERITE NICKEL ORE

• Main Authors: LI, Xingdui, WANG, Chunyi, TANG, Honghui, PEI, Xinan, LI, Changdong
• Format: Patent
• Language: English; French; German
• Published: 17.01.2024
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; FERROUS OR NON-FERROUS ALLOYS; INORGANIC CHEMISTRY; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

Disclosed is a method for producing battery-grade nickel sulfate by using laterite nickel ore comprising the following steps: sorting the laterite nickel ore to obtain lump ore and sediment ore; crushing the lump ore, and then performing heap leaching, to obtain a crude nickel sulfate solution A; separating the sediment ore to obtain high chromium ore, low iron, high magnesium ore, and high iron, low magnesium ore, and drying, roasting, reducing, and sulfurating the low iron, high magnesium ore to obtain low nickel matte; blowing and performing water extraction on the low nickel matte, and then performing oxygen pressure leaching, to obtain a crude nickel sulfate solution B; performing pressure leaching on the high iron, low magnesium ore to obtain a crude nickel sulfate solution C; and performing extraction on the crude nickel sulfate solutions A, B, and C, and then evaporating and crystallizing, to obtain battery-grade nickel sulfate. In the present disclosure, advantages of three technologies, that is, an RKEF process, a pressure leaching process, and a heap leaching process are fully utilized, and the three technologies are integrated together to complement each other, such that characteristics of different ores are utilized, and appropriate processes are used, and as a result the production costs are low, and a comprehensive recovery rate of nickel and cobalt reaches more than 90%.