中国有色冶金

In this paper, the origin and development of nickel-cobalt precipitation and enrichment technology in high-pressure acid leaching (HPAL) process for low-grade laterite nickel ore are introduced. The problems existing in the current application process are described in detail. At the same time, the alkali activation controlling technology (AACP) invented by ENFI is emphatically introduced.The technology includes three core technologies,in-situ base conversion of sodium hydroxide, pre-seeding reforming and template-induced growth, and convergent system regulation. It avoids the technical barriers set by foreign companies through patents in hydrogen sulfide and magnesium oxide precipitation technologies. The technical process is ingenious, the equipment is simple and universal, and the compatibility with the high-pressure leaching system is strong. The quality of nickel-cobalt hydroxide (MHP) products is excellent and stable.Moreover, ENFI has developed a high-pressure acid leaching process equipment engineering system (ENFIHPAL) for the problems existing in HPAL, which shortens the project implementation cycle, and carries out basic selection design, optimization and problem discrimination for the whole equipment system, which can ensure the stability and operation rate of the equipment system under complex operating conditions.After the successful application of AACP technology in Ruimu nickel-cobalt project in Papua New Guinea, it has also achieved remarkable application results in Liqin project, Huayueproject and other projects in Indonesia. The MHP products have become the best quality intermediate products at the raw material supply of the EV power battery industry.The HPAL-AACP process route is expected to be the first choice for the efficient utilization of low-grade laterite nickel ore.