Answer :

(i) SiO2 is used as a (acidic) flux in the process of extraction of copper from copper pyrites (CuFeS2). This flux reacts with the (basic) gangue (impurity), FeO to form iron silicate, FeSiO3, which is known as the slag.


The reactions involved in this process are as follows:


• Production of copper matte (mixture of Cu2S and FeS) from copper iron pyrites (CuFeS2)



• Oxidisation of FeS to FeO



• Production of slag



(ii) Sulphide ores are preferentially wetted by oils while the gangue is preferentially wetted by water .The ore particles get adsorbed on oil droplets and come to the surface where they can be collected as froth gangue is wetted by water and gets settled down. Eg. It is done for PbS ores.


Depressants help to separate two sulphide ores by selective prevention of froth formation by one ore and allowing the other to come into froth. NaCN is used as a depressant in order to separate two sulphide ores (ZnS and PbS).


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

Note : In the folChemistry - Exemplar

Which of the follChemistry - Exemplar

Common impuritiesChemistry - Exemplar

In the Froth FloaChemistry - Exemplar

Which of the follChemistry - Exemplar

With the help of Chemistry - Exemplar

<span lang="EN-USChemistry - Board Papers