Method for producing battery-grade nickel sulfate by means of laterite nickel ore

• Main Authors: PEI XIN'AN, TANG HONGHUI, LI XINGDUI, WANG CHUNYI, LI CHANGDONG
• Format: Patent
• Language: Chinese; English
• Published: 15.12.2020
• 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

The invention discloses a method for producing battery-grade nickel sulfate by means of laterite nickel ore. The method includes the following steps that the laterite nickel ore is sorted, and lump ore and sediment ore are obtained; the lump ore is crushed, and dump leaching treatment is performed to obtain a crude nickel sulfate solution A; the sediment ore is separated to obtain high-chromium ore, low-iron high-magnesium ore and high-iron low-magnesium ore, and the low-iron high-magnesium ore is dried, roasted, reduced and vulcanized to obtain low-grade nickel matte; the low-grade nickel matte is subjected to blowing, water extraction and oxygen pressure leaching to obtain a crude nickel sulfate solution B; pressure leaching is performed on the high-iron low-magnesium ore to obtain a crude nickel sulfate solution C; and the crude nickel sulfate solutions A, B and C are extracted, and evaporative crystallization is performed to obtain the battery-grade nickel sulfate salt. According to the method, the advant