Method for comprehensively utilizing laterite-type nickel ore

Abstract

The invention relates to a process for comprehensively utilizing laterite-type nickel ore, which comprises the sequential steps of: conducting dump leaching and depositing to low-grade laterite-type nickel ore on one hand to produce nickel sulfide and cobalt sulfide after selective mining/ore dressing, on the other hand conducting pyro-smelting to high-grade laterite-type nickel ore, and obtaining ferronickel after pre-reduction roasting, furnace smelting and refining. The process preferentially combines the technologies of dump leaching and pyro-smelting and is characterized by low comprehensive production cost, high resource utilization rate, easy operation, less investment, small energy consumption, fast effect and the like.

Description

1. Technical field [0001] The invention relates to a method for comprehensively utilizing laterite-type nickel ore, which is suitable for the application of beneficiation and smelting of laterite-type nickel ore. 2. Background technology [0002] According to the statistics of relevant departments, the existing nickel resources in the world are about 160 million tons, of which 30-40% are produced in nickel sulfide deposits, and 60-70% are produced in nickel oxide deposits. Because nickel oxide ore is red, it is commonly called lateritic nickel ore. At present, more than 70% of the world's annual nickel production is produced with nickel sulfide as raw material, mainly because nickel sulfide ore is generally of high grade and easy to mine and utilize, while lateritic nickel ore has low nickel content, but its reserves and deposit scale Huge, shallow buried, suitable for open-pit mining. At the same time, lateritic nickel ore has problems such as difficulty in beneficiation, ...

AI Technical Summary

Problems solved by technology

Most enterprises adopt the relatively mature method of pyro-smelting to produce ferronickel, which can only process high-magnesium laterite nickel ore and the nickel grade of the raw material is generally required to be >1.8%. Ferronickel can be recovered, but the investment is large and the production cost is high. The consumption is high; the fire-based matte smelting method can only process high-magnesium laterite-type nickel ore and can also recover cobalt, but it is also a large investment, high production cost and long process flow; Oeyama process is a special technology of Oeyama Nickel Iron Plant in Japan. There is technology, using the pre-reduction-magnetic separation process to produce ferronickel, the production cost is relatively low, but the process equipment is complicated and the operation is difficult; the reduction-ammonia leaching process can recover cobalt, but the process and equipment are complicated and the recovery rate is low; high-pressure acid Leaching is suitable for processing low-magnesium laterite-type nickel ore, and its disadvantages are large investment, high production cost, complex process, and high difficulty in equipment operation and maintenance; atmospheric pressure acid leaching is suitable for processing low-magnesium laterite-type nickel ore, with less investment and less equipment It is simple, but the recovery rate is low and the process is immature. It is represented by the disclosure of Chinese patent application No. 200810031041.1 "Using atmospheric acid leaching process to treat low-grade laterite nickel ore"; the heap leaching method has investment in the treatment of low-grade laterite nickel ore less, simple equipment and other advantages, but the recovery rate is low, as represented by the Chinese Patent Publication No. CN1311089C "extracting nickel and cobalt in low-grade laterite nickel ore by heap leaching"

In short, for the lateritic nickel ore with low nickel grade, it is difficult to obtain better economic benefits and mine resource utilization by using the above-mentioned single method.

Images