Refining of metals by liquation

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Liquation: 

Impure metals in the form of ingots (blocks) are placed in upper part of a slanting hearth maintained at a temperature slightly above the melting point of metals. The pure metals melts and drains away while the impurities remain behind as dross in the hearth.
 

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Siemens Ozoniser how Siemens Ozoniser work

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F - block element What are f - block elements

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