Nickel processing - Extraction and refining | Britannica

Nickel requires higher smelting temperatures in the range of 1,350 °C [2,460 °F] in order to produce an artificial nickel-iron sulfide known as which contains 25 to 45 percent nickel. In the next step, iron in the matte is converted to an oxide, which combines with a silica flux to form a slag.

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