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Some factories sorted nickel concentrate (10% nickel), copper concentrate and magnetic iron sulfur concentrate from mixed concentrate. Nickel concentrate or mixed concentrate usually use pyrometallurgy, produce the intermediate products - nickel matte, make copper and nickel enriched in sulfide form, and then refining and purifying to get nickel. 

 The metal powder supplier smelting nickel have three processes including roasting, smelting, blowing: `roasting, make part of the iron sulfide in concentrates be oxidized into iron oxide, emit a lot of heat, is basically a self heated process, can use multiple hearth roaster, linear type sintering machine, a rotary kiln or fluidized calciner (boiling furnace). asmelting. Heating and melting the roasted ore and flux, remove the iron oxide and quartz flux slagging in roasted ore, and remove part of the other impurities. The disulfide three nickel (Ni3S2), cuprous sulfide (Cu2S) and ferrous sulfide (FeS) in roasted ore formed a low-nickel matte, precious metals also included in it. Traditional smelting equipments have blast furnace, reverberatory furnace, in low tariff areas or smelting the difficult furnaces materials can also be used electric furnace. 

bblowing. blown the air into the molten low nickel matte, make the ferrous sulfide be oxidized into ferrous oxide and react with quartz (SiO2) slagging, produce the nickel-rich matte which composed by disulfide nickel and cuprous CAT6 Cable sulfide. Its main component is 70 to 75% of nickel and copper, sulfur 20 ~ 25%. Depending on the different blowing system, the iron content is 0.5 to 3%, such as the iron content dropping lower, the majority of cobalt in low ice nickel were into the converter slag. The liquid nickel matte produced by blowing converter through slow cooling for three days, in which the nickel sulfide, cuprous sulfide, and a small amount of copper-nickel alloy crystal segregated respectively.

 And then pulverized the high nickel matte to less than 280 mesh, first using magnetic separation method to separate a small amount of “alloy”, then separated by flotation, get the nickel sulfide and sulfide copper concentrate. About 90% of the platinum group metal enriched in the "alloy". The nickel sulfide by flotation can be made of metal nickel anode or nickel sulfide anode to electrolytic refine, as described below: First metal nickel anode electrolysis is roasting nickel sulfide to nickel oxide, use furnace or reverberatory furnace to restore and smelt produce crude nickel. Use this crude nickel as anode, pure nickel plate as the cathode, electrolysis in a diaphragm electrolyzer. 

Nickel sulfate (NiSO4) and nickel chloride (NiCl2) mixture as the electrolytic solution. In order to prevent the anode dissolved impurities precipitated in the anode, cathode and anode separated by separator. While electrolyzing, the cathode new liquid sent to cathode chamber, using the differential permeation of both sides liquid surface of the diaphragm, through diaphragm to the anode chamber, the anolyte outflow from the anode chamber by purifying, recycling. And then sulfide nickel anode electrolysis cast nickel sulfide into anodes directly, electrolyzing in a diaphragm electrolyzer, the anode sulfide’s sulfur is oxidized to elemental sulfur, remain in the anode mud, and nickel ions into the solution, then deposited on the cathodeto with electrolytic nickel. The nickel sulfide’s electroysis cathode and anode current efficiency has large difference, need to add more nickel ions in the electrolyte. Other processes are the same as the metal nickel anode electrolytic. During electrolysis, the anode copper, iron, cobalt and other impurities were into the electrolyte, therefore the anolyte from anode chamber need to purify. Generally use nickel powder replacement precipitate to remove copper; blowing air make the iron oxidized and hydrolysis precipitated; blowing chlorine to make cobalt oxidized into high cobalt, plus NiCO3 or Na2CO3 to precipitate Co(OH)3. This precipitate is called as cobalt slag, is an important raw material of mentioning cobalt. Source: