Refining (metallurgy)
Process of purifying metals / From Wikipedia, the free encyclopedia
For other uses, see Refining.
In metallurgy, refining consists of purifying an impure metal. It is to be distinguished from other processes such as smelting and calcining in that those two involve a chemical change to the raw material, whereas in refining the final material is chemically identical to the raw material. Refining thus increases the purity of the raw material via processing.[clarification needed] There are many processes including pyrometallurgical and hydrometallurgical techniques.
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