Tag: concentration of ores

Questions Related to concentration of ores

Sulphide ore of copper can be concentrated by froth floatation process.

chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

  1. True

  2. False

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Correct Option: A
Explanation:
Froth Floatation Process:- The process is best suitable for sulphide ores. The process is based on different wetting characteristics of the ore and gangue particles with water and pine oil. The ore is wetted by oil and impurities are wetted by water. Ore particles are adsorbed on potassium or sodium ethyl xanthate (as collector) and come at the surface along with the froth. Froth stabilisers (cresols, aniline) stabilise the froth. So sulphide of copper can be concentrated by froth floatation process.

Sulfide ores are usually dressed by the _____ process.

chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

  1. sieve process

  2. froth floatation

  3. magnetic floatation

  4. none of these

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Correct Option: B
Explanation:

Froth floatation process is based on the principle that the metallic sulphide particles of ore are preferentially wetted by oil and the gangue particles by water.
Sulphide ores being lighter are easily wetted by oil to come on the surface of solution with froths during froth floatation process, leaving behind heavy matter of gangue wetted by water.
Sulphide ores are usually dressed by froth floatation process.

The oil used in the froth floatation method for the purification of ore is _________.

chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

  1. Coconut oil

  2. Olive oil

  3. Pine oil

  4. Castor oil

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Correct Option: C
Explanation:
Froth Floatation process is suitable for sulphide ores. The process is based on different wetting characteristics of the ore and gangue particles with water and pine oil. 

The ore is wetted by oil and impurities are wetted by water. Ore particles are adsorbed on potassium or sodium ethyl xanthate (as a collector) and come at the surface along with the froth. Froth stabiliser (cresols, aniline) stabilise the froth. 

So, the correct option is $C$

During concentration of _____ ores by froth floatation process potassium ethyl xanthate is added.

chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

  1. sulphide

  2. carbonate

  3. halide

  4. amide

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Correct Option: A
Explanation:

During concentration of sulphide ores by froth floatation process potassium ethyl xanthate is added.
Ethyl xanthate, potassium ethyl xanthate and similar compounds compounds behaves as collector and attaches themselves by polar groups to ore particles making that hydrophobic and i.e., why ore particles are passed into froth.

Magnetic ores can be easily separated by gravity separation method.

chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

  1. True

  2. False

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Correct Option: B
Explanation:

The given statement is false as magnetic ores are separated by magnetic separation method.

Ores like magnetite or tungstates in tin ores are concentrated by ______.

chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

  1. Froth floatation

  2. Magnetic separation

  3. Gravity separation

  4. Electrostatic separation

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Correct Option: B
Explanation:
Magnetic Separation:- This method is adopted when either ore or the impurities are magnetic in nature. They are separated from each other by means of magnetic separators.
Eg: $SnO _2$ (Non magnetic) in $Fe _3O _4$ (magnetic)

The substance added in water in the froth floatation process is

chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

  1. Olive oil

  2. Pine oil

  3. Coconut oil

  4. None of the above

Show answer
Correct Option: B
Explanation:

Froth floatation process: This process is best suitable for sulphide ores. It is based on different wetting characteristics of the ore and gangue particles with water and pine oil. The ore is wetted by oil and impurities are wetted by water. Ore particles are adsorbed on potassium or sodium ethyl xanthate (as collector) and come at the surface along with the froth. Froth stabiliser (cresols, aniline) stabilises the froth.

Ore dressing for iron is done by:

chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

  1. froth floatation process

  2. magnetic separation

  3. hand picking

  4. all of the above

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Correct Option: B
Explanation:

In the field of extractive metallurgy, mineral processing, also known as ore dressing, is the process of separating commercially valuable minerals from their ores. 

Ore dressing for iron is done by magnetic separation.
So answer is B.

Which oil is used as frother in froth floatation process?

chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

  1. Mustard oil

  2. Coconut oil

  3. Olive oil

  4. Pine oil

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Correct Option: D
Explanation:

Pine oil enhances non-wettability of the mineral particles. So, it is used as frothier in froth-flotation process.

Any physical and chemical process by which low grade ores are concentrated, is __________.

chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

  1. froth flotation

  2. crushing and then screening

  3. hand picking

  4. washing in zigs

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Correct Option: A
Explanation:

Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic. Any physical and chemical process by which low grade ores are concentrated is called froth flotation.