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Question
In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by:
(i) using collectors.
(ii) adjusting the proportion of oil to water.
(iii) using depressant.
(iv) using froth stabilisers.
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Solution
(ii) adjusting the proportion of oil to water.
(iii) using depressant.
Explanation:
In forth floatation process, it is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants'. For example, in case of an ore containing \[\ce{Zns and PbS}\], the depressant used is \[\ce{NaCN}\].
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RELATED QUESTIONS
Write the principle behind the froth floatation process. What is the role of collectors in this process?
What is the role of depressant in froth floatation process?
What is the role of depressants in the froth floatation process?
Write the principles of the following methods :
Froth floatation method
Which process is usually applied for separating gangue from sulphide ores?
Which of the following ores are concentrated by froth floation?
(i) Haematite
(ii) Galena
(iii) Copper pyrites
(iv) Magnetite
How do we separate two sulphide ores by Froth Floatation Method? Explain with an example.
Match items of Column I with the items of Column II and assign the correct code:
| Column I | Column II |
| (A) Cyanide process | (1) Ultrapure \[\ce{Ge}\] |
| (B) Froth Floatation Process | (2) Dressing of \[\ce{ZnS}\] |
| (C) Electrolytic reduction | (3) Extraction of \[\ce{Al}\] |
| (D) Zone refining | (4) Extraction of \[\ce{Au}\] |
| (5) Purification of \[\ce{Ni}\] |
Match items of Column I with the items of Column II and assign the correct code:
| Column I | Column II |
| (A) Sapphire | (1) \[\ce{Al2O3}\] |
| (B) Sphalerit | (2) \[\ce{NaCN}\] |
| (C) Depressan | (3) \[\ce{Co}\] |
| (D) Corundum | (4) \[\ce{ZnS}\] |
| (5) \[\ce{Fe2O3}\] |
Assertion: Sulphide ores are concentrated by Froth Flotation method.
Reason: Cresols stabilise the froth in Froth Flotation method.
The oil used as frothing agent in froth flotation process is ______.
