Question

The methods NOT involved in concentration of ore are
A Liquation
B Leaching
C Electrolysis
D Hydraulic washing
E Froth floatation
Choose the correct answer from the options given below :

• A. B, D and E only
• B. $C , D$ and $E$ only
• C. $A$ and $C$ only
• D. B, D and C only

Hint:

The concentration of ore involves separating valuable minerals from the gangue by methods like Hydraulic Washing, Froth Flotation, and Leaching. Electrolysis and Liquation are not used for this purpose.

Answer 1

The Correct Option is C

To determine which methods are not involved in the concentration of ore, let's review each option:

1. Liquation: Liquation is a process used for refining metals, not for concentrating ores. It is used to separate metals with low melting points, such as tin, from impurities.
2. Leaching: Leaching is a hydrometallurgical process used for the extraction of metals from their ores by dissolving them. This method is indeed involved in the concentration of specific ores, particularly those of aluminum and gold.
3. Electrolysis: Electrolysis is a method used for extraction or purification of metals, such as in the electrorefining of copper. It is not used for the concentration of ores.
4. Hydraulic Washing: Hydraulic washing is a method based on the difference in the gravity of the ore and gangue particles used in the concentration of ores, particularly with heavier ores like lead or tin.
5. Froth Flotation: This method is commonly used for concentrating sulphide ores, such as those of copper and zinc. It separates the hydrophobic particles from hydrophilic ones.

Analyzing the processes, we can conclude that:

• Liquation (A) and Electrolysis (C) are not methods used in the concentration of ores.

Therefore, the correct answer is option: A and C only.

To recap, the processes used in the concentration of ores described here are leaching, hydraulic washing, and froth flotation. These methods separate the desired minerals from the gangue based on their respective physical or chemical properties.