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Froth flotation...

Froth flotation

A

is a physical method of separation mineral from gangue.

B

is method to concentrate the ore depending on the difference in wetability of gangue and the ore.

C

Is used for the sulhide ores.

D

Is a method in which ore sink to the bottom

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The correct Answer is:
B, C
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Complex formed in the following methods are (I) Mond's process for purification of nickel (II) Removal of lead poisoning from the body (III) Cyanide process for extraction of silver (IV) Froth flotation process for separation of ZnS from galena ore by using depresent.

(1) Metals occur in the native form because of their (a) High electronegativity (b) Low reactivity ( c) Low density (d) High reactivity (2) Specific gravity of slag is (a) Higher than molten metal (b) Same as that of molten metal ( c) Less as that of molten metal (d) None of the above (3) Which process is used for the extraction of metals from their sulphide ores ? (a) Smelting Froth flotation ( c) Electrolysis (d) Metal displacement (4) Calamine is an ore of (a) Hg (b) Zn ( c) Ca (d) Cd (5) Non-fusible impurities of ores removed by adding Slag (b) Flux ( c) Gangue (d) None (6) Common method of extraction of metals from oxide ore involves. (a) Reduction with aluminium (b) Reduction with carbon Reduction with hydrogen (d) Electrolytic method (7) Smelting is the reduction of oxide to metal by (a) Carbon (b) Hydrogen ( c) Aluminimum (d) Electric current During froth flotation process, commonly used frother is. (a) CuSO_(4) (b) NaCN + alkali ( c) Pine oil (d) Potassium xanthate (9) Iron ores are dressed by (a) Froth flotation process (b) Hand picking ( c) Magnetic separation (d) All of the above (10) Silicon is the main constituent of (a) Alloys (b) Rocks ( c) Animals Plants.

(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' ?

Chief ore of Zn is ZnS . The ore is concentrated by froth flotation process and then heated in air to convert ZnS to ZnO . ltntgt 2 ZnS + 3O_(2) rarr 2 ZnO + 2 SO_(2) …(i) ZnO , thus formed is treated with dilute H_(2) SO_(4) . ZnO + H_(2) SO_(4) rarr ZnSO_(4) + H_(2) O ....(ii) On electrolysis of ZnSO_(4(aq)), Zn metal is produced. 2 ZnSO_(4) + H_(2) O rarr 2 Zn + 2H_(2) SO_(4) + O_(2) ....(iii) ZnO on dissolution in NaOH gives

Chief ore of Zn is ZnS . The ore is concentrated by froth flotation process and then heated in air to convert ZnS to ZnO . ltntgt 2 ZnS + 3O_(2) rarr 2 ZnO + 2 SO_(2) …(i) ZnO , thus formed is treated with dilute H_(2) SO_(4) . ZnO + H_(2) SO_(4) rarr ZnSO_(4) + H_(2) O ....(ii) On electrolysis of ZnSO_(4(aq)), Zn metal is produced. 2 ZnSO_(4) + H_(2) O rarr 2 Zn + 2H_(2) SO_(4) + O_(2) ....(iii) How many kilomoles of NaOH are required to dissolve all the ZnO produced in reaction (ii) ?

The substance used as froth stablisers in froth floatation process is :

NARAYNA-METTALURGY-MULTIPLE ANSWER QUESTOINS
  1. The reaction (s) which does (do) not occur in the reduction zone in th...

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  2. Which of the following reduction reactions are actually employed in co...

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  3. Froth flotation

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  4. The metals which cannot be obtained by electrolysis of aqueous solutio...

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  5. Which of the following are methods of concentration of minerals

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  6. Roasting is carried out to :

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  7. The correct statement (s) is/are

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  8. Following reaction(s) is/are involved in thermite process :

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  9. Why lime stone is added in the extraction of lead from galena?

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  10. Amphoteric nature of aluminum is employed in which of the following pr...

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  11. The major role of fluorpar (CaF2 ) which added in small quantities in ...

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  12. Which of the following statement is/are not correct?

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  13. Bessemerisation is carried out for

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  14. Which of the following statement is/are correct with the extraction of...

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  15. In the extraction of Ag and Au using a KCN solution, cyanide ions reac...

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  16. Which of the following are correctly matched?

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  17. Which of the following statements are correct ?

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  18. Which of the following statement is/are correct?

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  19. Find out the incorrect statement among the following.

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  20. Which of the following are the advantages of using oxygen in place of ...

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