Technological innovation

——New Technology of Nitric Acid Pressure Leaching of Limonite-type Laterite Nickel Ore

It has realized the cascade enrichment and separation of nickel, cobalt, manganese, iron, magnesium, aluminum, scandium and other metals in the global low-grade (containing about 1% nickel) limonite-type laterite nickel ore, except for the preparation of nickel and cobalt hydroxide It can also produce a large amount of high-value by-products such as iron concentrate (Fe>60%), highly active magnesium oxide, aluminum oxide, and scandium oxide, which completely solves the problem of the inability to separate iron, magnesium, aluminum, etc. when the sulfuric acid method treats laterite nickel ore Metals have the disadvantage of producing a large amount of waste residue, and the metal in the waste residue produced by the sulfuric acid method has been commercialized. In addition, the technology's acid-base recycling, water recycling, and cascade comprehensive utilization of thermal energy not only save costs, but also achieve the world's leading level of "three wastes" emissions, effectively realizing "green" production. In this process, the reaction temperature and pressure are also milder, and the equipment requirements are lower, realizing the localization of production equipment.

"New technology for nitric acid pressure leaching of limonite-type laterite nickel ore" was recognized as a "world's first" by the National Science and Technology Novelty Search and Consultation Unit of the Ministry of Science and Technology-Non-ferrous Metals Industry Science and Technology Novelty Search Center, and will be launched in June 2020 On the 29th, the China Nonferrous Metals Industry Association (formerly the Ministry of Metallurgical Industry) convened a technical evaluation team composed of 7 well-known experts in China’s metallurgical industry, including Academician Qiu Dingfan, Academician Zhang Wenhai, and Academician Huang Xiaowei. The overall technical level of the new nitric acid pressure leaching technology is in an international leading position, and the technology promotion market has great potential and promising prospects, which will have a significant impact on the nickel, cobalt and stainless steel industries." Our company uses this international leading technology to build an industrial test line that can process 10,000 tons of dry-base ore annually. The product quality is up to standard, the technology is reproducible, and the maturity is high. Currently, a green demonstration project of new technology for processing 1.8 million tons of limonite-type laterite nickel ore is being constructed in Beihai, Guangxi.

"New technology for nitric acid pressure leaching of limonite-type laterite nickel ore" (international leader)

—Preparation process of high nickel ternary precursor

Aiming at the complex alloy materials recovered from the smelting and recycling of waste catalysts containing nickel, cobalt, molybdenum, vanadium and phosphorus in the petrochemical industry, a one-step acid leaching process of nickel, cobalt, molybdenum, vanadium and phosphorus in the alloy was developed, and the process of "precipitation + resin + extraction" was adopted. Technology to separate nickel, cobalt, molybdenum, vanadium, and phosphorus, and purify them to obtain high-purity nickel sulfate, cobalt sulfate and other products. At the same time, nickel sulfate and cobalt sulfate can be further synthesized into nickel-cobalt-manganese ternary precursor products for batteries. This technology was assessed as "leading in the country" by the Sichuan Provincial Department of Science and Technology.

Preparation process of high-nickel ternary precursor (domestic leading)