Choose the correct statement(s) for froth flotation process, which is used for the concentration of sulphide ore.
a) It is based on the difference in the ability of different minerals to become wet.
b) It uses sodium ethyl xanthate, $C_{2} H_{5} OC S_{2} N a$ as collector.
c) It uses $N a CN$ as a depressant in the mixture of $Z n S$ and $P b S$ , where $Z n S$ forms soluble complex and $P b S$ forms froth.

Question

Choose the correct statement(s) for froth flotation process, which is used for the concentration of sulphide ore.
a) It is based on the difference in the ability of different minerals to become wet.
b) It uses sodium ethyl xanthate,

C_{2} H_{5} OC S_{2} N a

as collector.
c) It uses

N a CN

as a depressant in the mixture of

Z n S

and

P b S

, where

Z n S

forms soluble complex and

P b S

forms froth.

Filo · Accepted Answer

In some sulphide ores of copper, zinc and lead, the concentration is brought by froth flotation process. In this method, the advantage is taken of the preferential wetting of the ore by an oil. The finely ground ore is taken in a tank containing water and 1% of pine oil or turpentine oil.

Collectors (e. g., pine oils, fatty acids, xanthates, etc.) enhance non-wettability of the mineral particles and froth stabilisers (e. g., cresols, aniline) stabilise the froth.

Sometimes, 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 ZnS and PbS, the depressant used is NaCN. It selectively prevents ZnS from coming to the froth but allows PbS to come with the froth.

Option D is correct.

Question Text	Choose the correct statement(s) for froth flotation process, which is used for the concentration of sulphide ore. a) It is based on the difference in the ability of different minerals to become wet. b) It uses sodium ethyl xanthate, $C_{2} H_{5} OC S_{2} N a$ as collector. c) It uses $N a CN$ as a depressant in the mixture of $Z n S$ and $P b S$ , where $Z n S$ forms soluble complex and $P b S$ forms froth.
Answer Type	Text solution:1
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Text solutionVerified

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