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Explain "Poling"....

Explain "Poling".

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when the metals are having the metal oxides as impurities this method is employed. The impure metal is melted and is then covered by carbon powder.Then it is stirred with green wood poles. The reducing gases formed from the green wood the carbon, reduca the oxides to the metal.
Eg : Cu & Sn metals are refined by this method.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-GENERAL PRINCIPLES OF MMETALLURGY-VERY SHORT ANSWER QUESTIONS
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  2. State the role of silica in the metallurgy of copper.

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  3. Explain "Poling".

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  4. Decribe a method for the refining of nickel.

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  5. How is cast iron different from pig iron?

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  6. What is the difference between a mineral and an ore?

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  7. Why copper matte is put in silica lined converter?

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  8. What is the role of cryolite in the metallurgy of aluminium?

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  9. How is leaching carried out in the case of low grade copper ores?

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  10. Why is zinc not extracted from zinc oxide through reduction using CO?

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  11. Give the composition of the following alloys. (a) Brass (b)Bronze ...

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  12. Explain the terms gangue and slag.

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  13. How is Ag or Au obtained by leaching from the respective ores?

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  14. What are the limitations of Ellingham diagram?

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  15. Write any two ores with formulae of the following metals: (a) Alumin...

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  16. What is matte? Give its Composition.

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  17. What is blister copper? Why is it so called?

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  18. Explain magnetic separation of impurities from an ore.

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  19. What is flux ? Give an example.

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  20. Give two uses each of the following metals: (a) Zinc (b) copper...

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