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Explain magnetic separation of impuritie...

Explain magnetic separation of impurities from an ore.

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Electro-magnetic method : The method is used if the gangue or the ore particles are magnetic in nature. The Finely prwdered ore is dropped on a belt moving on two strong electromagnetic rollers. The magnetic and the non-magnetic substances form two separate heaps. for example ,let the ore particles be magnetic and then the non-magnetic roller.
Eg : Haematite and magnetic hae magnetic ore particles. cassiterite or Tin stone has wolframite as magnetic impurity.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-GENERAL PRINCIPLES OF MMETALLURGY-VERY SHORT ANSWER QUESTIONS
  1. Decribe a method for the refining of nickel.

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  2. How is cast iron different from pig iron?

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

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

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

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

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

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

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  9. Explain the terms gangue and slag.

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

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  11. What are the limitations of Ellingham diagram?

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

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  13. What is matte? Give its Composition.

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

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  15. Explain magnetic separation of impurities from an ore.

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  16. What is flux ? Give an example.

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

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  18. Between C and CO, Which is a better reducing agent for ZnO?

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  19. Give the uses of a) cast iron b) wrought iron c) Nickel steel ...

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  20. How is aluminium useful in the extraction of chromium and mangannese f...

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