“The nickel oxide ore wet smelting process involves leaching the nickel oxide ore with acid. The nickel is then purified and enriched with an inorganic ion exchange resin in a complex metal ion solution. The nickel metal is then produced by an electrowinning process.†8 On the 2nd of the month, Dr. Chen Dongsheng, Professor of Henan University, introduced the wet smelting technology of nickel oxide ore .
In July of last year, the world’s first environmentally friendly industrialized production line for the hydrometallurgical production of nickel oxide ore was conducted via inorganic ion exchange resin engineering center of Henan University, Jinchuan Group Co., Ltd., Guangdong Jiaying College and Luoyang. The researchers of Environmental Protection Technology Co., Ltd. have worked collaboratively for four years to design and build. On April 12 this year, the results were published in the internationally renowned authoritative chemical journal AIChE Journal.
As a strategic scarce metal, nickel is widely used in alloy manufacturing, nickel-metal hydride batteries and other specialized fields. Many years of mining have resulted in the depletion of nickel sulphide ore, and people have no choice but to turn to nickel oxide deposits that account for 70% of global nickel storage. However, the wet extraction technology mainly used in the nickel oxide ore is not only low in separation efficiency but also the organic extractant is a flammable and explosive poisonous substance. The development of an efficient, environmentally friendly nickel oxide ore smelting process has become an urgent need for the global use of nickel resources.
In order to solve this international technical problem, the team led by Chen Dongsheng used porous silica gel as a skeleton, and through functional design, built an ion exchange resin with specific adsorption properties as an essential material for the separation of specific metal elements in complex systems to achieve nickel ions. From the high-efficiency and clean separation of leachate, in 2010, the world's first inorganic ion exchange resin production line was established in the pilot plant of inorganic ion exchange resin engineering center of Henan University.
Dr. Li Xin, inorganic ion exchange resin engineering center of Henan University, said that at the experimental stage, the team had already used the selective resin it developed to recycle resources from the Jinchuan Group's abandoned tailings, and extracted nickel therefrom. Copper and other valuable metals and nickel sulfate, copper sulfate and other salt products, successfully completed the industrialization test. “The next step is to use inorganic ion exchange resins for hydrometallurgy of nickel oxide ore (including tailings and low-grade ore). If this technology is promoted, it will change the world production pattern of nickel metal, making it impossible to use the original The nickel ore can be regenerated," said Dr. Chen.
It is understood that the extensive application of this process will greatly reduce energy consumption, promote energy conservation and emission reduction, and greatly increase resource utilization. “Hydrometallurgy of Nickel Oxide Ore†was also hailed by Tang Zhongli, the main discoverer of Jinchuan nickel ore and the academician of the Chinese Academy of Engineering as “a business that the predecessors did not want to doâ€.
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