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Which of the following processes is used for the concentration of sulphide ores in metallurgy?
Froth Floatation process
Magnetic Separation
Leaching
Calcination
Froth Floatation process
The Froth Floatation process is used for the concentration of sulphide ores based on the principle of differential wettability. In this process, the ore particles are wetted by oil (pine oil) and rise to the surface as froth, while the gangue (impurities) is wetted by water and settles at the bottom.
The Froth Floatation process is used for the concentration of sulphide ores based on the principle of differential wettability. In this process, the ore particles are wetted by oil (pine oil) and rise to the surface as froth, while the gangue (impurities) is wetted by water and settles at the bottom.
The principles of metallurgy and chemical processing are essential foundations for the Industrial Chemistry section of the UPSC and RRB General Science syllabus, which frequently tests the extraction methods for metals like Copper, Zinc, and Lead.
Froth Floatation is specifically used for sulphide ores like Galena (PbS), Cinnabar (HgS), and Zinc Blende (ZnS).
Pine oil acts as the frother, while sodium ethyl xanthate is often used as a collector to increase the non-wettability of the ore.
Depressants like Sodium Cyanide (NaCN) are used to separate two sulphide ores by preventing one from forming froth.
Magnetic Separation is used when either the ore or the impurities possess magnetic properties, such as for Magnetite or Hematite.
Leaching is a chemical process where the ore is dissolved in a suitable reagent; it is primarily used for the concentration of Bauxite ore (Bayer's process).
Calcination is a process of heating ore in the absence of air, used for carbonate and hydrated ores, not for concentration.
The process relies on the difference in the wetting characteristics of the metal sulphide and the gangue particles.
A is correct тАФ The Froth Floatation process utilizes the preferential wetting of sulphide ores by pine oil to separate them from hydrophilic gangue particles.
In the exam, always link Froth Floatation to Sulphide ores and Magnetic Separation to Ferrous ores (Iron); this distinction is a frequent examiner trap in RRB and SSC Science papers.
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