Panshi Nickel Ore Dressing Plant

Panshi nickel ore beneficiation plant in 1976 and designed by the Beijing Nonferrous Metallurgy Design Research Institute, designed capacity of 1500t / d, 1980 put into operation. The copper- nickel separation flotation section was put into operation in 1983.
(1) Ore nature: The first ore and seven mining areas of the plant for mineral supply are large magma-dissolved copper-nickel-nickel deposits, and the main ore bodies are concentrated and the grade is also high. In addition to the main metal nickel, the mine is accompanied by metals such as copper and cobalt that can be recovered comprehensively. Metal sulfides mainly in two fields of a nickel-containing pyrrhotite, pentlandite, purple sulfur pentlandite, chalcopyrite and pyrite; sulfide mineral content accounted for about 20% of the total ore, wherein pyrrhotite The ore accounts for more than 60% of the sulfides, and the ratio of pyrrhotite to nickel pyrite is 3~4:1. The gangue minerals mainly include orthopyroxene, tremolite , talc , serpentine and the like.
The phase analysis of copper nickel showed that the nickel and copper in the sulfide were 93.2% and 97.18%, respectively. A large number of pyrrhotite and secondary silicate gangue minerals such as talc, amphibole, amphibole and serpentine which are easy to float and easily muddy are the main factors affecting the grade and recovery rate of copper-nickel mixed concentrate. . In pyrrhotite, except for the presence of nickel in the same form, a part of pentlandite is embedded in a solid solution state, and gangue minerals generally contain less than 0.1% of nickel. Therefore, in order to improve the nickel concentrate grade, In addition to the gangue, pyrrhotite with a low nickel content must also be selected.
(2) Process flow: The three-stage one closed-circuit crushing process is adopted, and the grinding and floating is the stage grinding, copper-nickel mixing-separation flotation process. See the next two figures.

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The main feature of the copper-nickel separation flotation process is the use of cyanide-free separation flotation, that is, using lime instead of cyanide, adopting a phase inhibition method to eliminate the pyrrhotite interference, so that the copper and nickel can be separated, and the copper-nickel separation flotation is simplified. The smelting process reduces metal losses and reduces the cost of smelting products. Practice has proved that the process is reasonable, and the copper-nickel ratio of the separated copper concentrate and the nickel-copper ratio of the nickel concentrate are both greater than 10, which is an important achievement in the nickel selection technology in China.
In addition, the copper-nickel mixed float also considers the magnetic separation of the copper-nickel concentrate to remove the pyrrhotite, but this part of the equipment has not yet been put into production. The nickel concentrate is dewatered in three stages and the copper concentrate is dewatered in two stages.
The process indicators, unit consumption indicators and main equipment of the concentrator are shown in the following table: [next]

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