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A sample of galena is contaminated with ...

A sample of galena is contaminated with zinc blende. Name one chemical which can be used to concentrate galena selectively by froth floatation method.

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The chemical is sodium cyanide (NaCN). It forms as soluble zinc complex, ` Na_2 [ Zn (CN)_4] ` with ZnS which goes into solution and thus prevents it form forming the froth. Under these conditions, only PbS forms froth and hence can be separated from ZnS impurity.
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(a) What is a slag ? (b) Give the principle of zone refining ? ( c) An ore sample of galena (PbS) is contaminated with zinc blende (ZnS) . Give an example of a chemical which can be used to concentrate galena selectively by froth flotation process. (d) What is meant by the term 'Pyrometallurgy' ?

Name two ores which are concentrated by froth floatation method.

Which one of the following ores is best concentrated by froth floatation method ?

Which one of the following ores is best concentrated by froth flotation method:

PRADEEP-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -ADDITIONAL QUESTIONS (Very Short Answer Questions)
  1. Metal sulphides occur mainly in rocks and metal halides occur in lakes...

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  2. What is the role of collectors in froth floatation process ? G...

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  3. A sample of galena is contaminated with zinc blende. Name one chemical...

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  4. In the extraction of Al, impure alumina is dissolved in conc....

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  5. What is slag ? Give one example.

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  6. What type of ores are roasted?

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  7. What is meant by the term 'pyrometallurgy' ?

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  8. Indicate the temperature at which carbon can be used as a reducing age...

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  9. What is the role of coke in the extraction of iron from its ...

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  10. Name the reducing agent to obtain iron from Fe2 O 3 at hi...

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  11. Write a non - exothermic reaction takind place in the blast fur...

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  12. Which form of the iron is the purest form of commercial iron ?

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  13. What is the role of silica in the extraction of copper?

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  14. What is the composition of 'Copper matte'?

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

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  16. Which reducing agent is employed to get copper from the leached low-gr...

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  17. Write the overall reaction taking place in the process used for ...

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  18. How are tin and lead purified ?

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  19. Mention two important substances present in the 'anode mud' obtaine...

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  20. What is the principle of zone refining ?

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