The role of depressants in the Froth Flotatio | vedclass

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(A) In the Froth Flotation process,depressants are used to selectively prevent one component of the ore from forming froth.For example,in the separati

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selectively prevent one component of the ore from coming to the froth.

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(A) In the Froth Flotation process,depressants are used to selectively prevent one component of the ore from forming froth.For example,in the separation of $PbS$ (Galena) from $ZnS$ (Zinc blende),$NaCN$ is used as a depressant.$NaCN$ reacts with $ZnS$ to form a soluble complex $Na_2[Zn(CN)_4]$,thereby preventing $ZnS$ from coming to the froth,while $PbS$ forms the froth.

$I$ (Method)	$II$ (Ore)
$(I)$ Magnetic separation	$a. Cu_2S$
$(II)$ Froth flotation	$b. FeCr_2O_4$
$(III)$ Gravity separation	$c. Al_2(SiO_3)_3$

The role of depressants in the Froth Flotation method is to $.....$.

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Haematite ore is concentrated by

If bauxite contains $SiO_2$ as an impurity,which of the following methods can be used for its purification?

Match the method of concentration of ore in Column $I$ with the ore in Column $II$.

$I$ (Method) $II$ (Ore)

$(I)$ Magnetic separation $a. Cu_2S$

$(II)$ Froth flotation $b. FeCr_2O_4$

$(III)$ Gravity separation $c. Al_2(SiO_3)_3$

$A$ process used for the concentration of ore is

In the concentration of $PbS$ containing $ZnS$ as impurity,the depressant used is:

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