Nickel ore is mainly divided into copper- nickel-nickel ore and nickel-nickel ore, and the processing and processing methods of the two are completely different.
Nickel ore copper sulfide nickel
The most suitable method for the beneficiation of copper-copper-nickel ore is flotation, and magnetic separation and re-election is usually an auxiliary beneficiation method. When flotation of copper-nickel ore, a collector and a foaming agent for flotation of copper sulfide minerals are often used. One of the basic principles for determining the flotation process is to allow copper to enter the nickel concentrate while avoiding nickel from entering the copper concentrate. Because the nickel in the copper concentrate loses a lot during the smelting process, the copper in the nickel concentrate can be recovered more completely. Copper-nickel ore flotation has the following four basic processes.
Direct use of priority flotation or partial priority flotation process: When the ore contains more copper than nickel, this process can be used to select copper as a separate concentrate. The advantage of this process is that copper concentrates with lower nickel content can be obtained directly.
1) Mixed flotation process: used to select ore containing copper below nickel, and the obtained copper-nickel mixed concentrate is directly smelted into high-ice nickel.
2) Mixing - preferred flotation process: mixing flotation of copper and nickel from ore, and separating copper concentrate containing low nickel and nickel concentrate containing copper from the mixed concentrate. After the nickel concentrate is smelted, high ice nickel is obtained, and the high ice nickel is further subjected to flotation separation.
3) Mixing - preferential flotation and recovery of part of the nickel from the mixed flotation tailings: when the floatability of various nickel minerals in the ore varies greatly, the copper-nickel is mixed and floated, and then from its tailings Further recycling of nickel-containing minerals with poor floatability.
Nickel ore nickel oxide ore
Nickel oxide ore is often removed by crushing, sieving, etc. to remove bulk rock with weak weathering and low nickel content. Since nickel in nickel oxide ore is often dispersed in gangue minerals with the same type of similarity, and the particle size is very fine, it cannot be enriched by mechanical beneficiation methods and can only be directly smelted.
The smelting and enriching method of nickel oxide ore can be divided into two major categories: fire method and wet method. The former can be divided into sulfur smelting, nickel iron method and granular iron method; the latter has reduction roasting - atmospheric ammonia leaching method, high pressure acid leaching method and the like.
Nickel oxide ore does not occupy an important position in China. Only the nickel oxide mines in Yunnan Mojiang Gold Plant and Yuanjiang Anding Area have certain reserves. The mine is designed to use sulfur smelting (reduction roasting) better than ammonia leaching. However, in general, the ore grade is low, magnesium is high (MgO 15% to 30%) refractory, fuel consumption is large, transportation is difficult, and it is difficult to put on the construction schedule.
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