Which of the following statements is not correct? (i) Froth-floatation is used for removing gangue from…
Which of the following statements is not correct?
(i) Froth-floatation is used for removing gangue from sulphide ore.
(ii) Cresols are used to stabilise the froth.
(iii) Sodium cyanide can be used as depressant for preferential separation.
(iv) Aniline can be used as froth enhancer.
(i)
(ii)
(iii)
(iv)
Solution
Froth-flotation is a process for selectively separating hydrophobic materials from hydrophilic. This is used in mineral processing, paper recycling and waste water. Aniline or cresols are added to stabilise the froth, not for froth enhancer. Hence, the correct option is (4).