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Impurities of sulphur, silicon and phosp...

Impurities of sulphur, silicon and phosphorus can be removed from cast iron by adding

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`Fe_(2)O_(3) +3C rarr 2Fe +3CO`
Limestone is added as flux and sulphur, silicon and phosphours change to their oxides and pass into the slag.
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ALLEN-METALLURGY-EXERCISE -04
  1. Why is an external emf of more than 2.2 V required for the extracation...

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  2. At temperature above 1073K, coke can be used to reduce FeO to Fe. How ...

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  3. Impurities of sulphur, silicon and phosphorus can be removed from cast...

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  4. How is copper extracted from low grade copper ores ?

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  5. Write two basic requirements for refining of a metal by Mond's process...

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  6. Although carbon and hydrogen are better reducing agents but they are n...

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  7. How do we separate two sulphide ores by froth floatation method ? Expl...

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  8. The purest form of iron is prepared by oxidising impurities from cast ...

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  9. The mixture of compounds A and B is passed through a column of Al(2)O(...

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  10. Why is sulphide ore of copper heated in a furnance after mixing with ...

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  11. Sulphdies ores are converted to oxides before reduction . This is expl...

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  12. Which method is used for refining Zr and Ti ? Explain with equation.

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  13. What should be the considering during the extraction of metal by elect...

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  14. What is the role of flux in metallurgical processes?

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  15. How are metals used as semiconductors refined ? What is the principle ...

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  16. Write down the reaction taking place in blast furnance related to the ...

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  17. Give two requirements for vapour phase refining.

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  18. Write the chemical reactions involved in the process of extraction of ...

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  19. Match the items of column I with items of column II and assign the cor...

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  20. Match the items of Column I with the items of Column II and assign the...

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