There are several methods for refining of crude metals (a) For which

1.	There are several methods for refining of crude metals (a) For which metal purification is cupellation used for? (b) Explain liquation. (c) What is the principle of zone refining?
Answer» (a) Copper. (b) The impure metal is heated in the sloping floor. The low meting metal melts and flows down leaving behind the impurities. Thus method is known as liquation. (c) This method is based on the principle that the impurities are more soluble in molten state. The impure metal, in the form of a rod, is melted over a very narrow region at one end. The impurities get accumulated in the molten region and the molten region is gradually transferred to one end by moving the heat source. The impurities collected in the molten region are swept at one end of the metal and are discarded.

There are several methods for refining of crude metals (a) For which metal purification is cupellation used for? (b) Explain liquation. (c) What is the principle of zone refining?

Answer»

(a) Copper.

(b) The impure metal is heated in the sloping floor. The low meting metal melts and flows down leaving behind the impurities. Thus method is known as liquation.

(c) This method is based on the principle that the impurities are more soluble in molten state. The impure metal, in the form of a rod, is melted over a very narrow region at one end. The impurities get accumulated in the molten region and the molten region is gradually transferred to one end by moving the heat source. The impurities collected in the molten region are swept at one end of the metal and are discarded.

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