Tag: general principles of metallurgy

Quizzes (6) Questions (151)

Questions Related to general principles of metallurgy

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

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

  1. Froth floatation

  2. Magnetic separation

  3. Gravity separation

  4. Electrostatic separation
Reveal answer Fill a bubble to check yourself
B Correct answer
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)
Multiple choice chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

The substance added in water in the froth floatation process is

  1. Olive oil

  2. Pine oil

  3. Coconut oil

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Ore dressing for iron is done by:

  1. froth floatation process

  2. magnetic separation

  3. hand picking

  4. all of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. froth flotation

  2. crushing and then screening

  3. hand picking

  4. washing in zigs
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

An ore on heating in air forms $SO _{2}$. State the process that will be used for its concentration.

  1. Hydrautic washing

  2. Magnetic separation

  3. Froth floatation

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Whenever a metal sulphide is heated in air, sulphur dioxide is formed as one of the products. A sulphide ore is concentrated by the froth floatation process.

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

In froth floatation process, gangue particles are wetted by pine oil.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Froth flotation is a process to purify sulfide ores, in presence of pine oil. The oil acts as hydrophobic agent and forms froth with hydrophobic impurities (gangue) which is skimmed off from the surface leaving behind the concentrated mineral.
Wet pine oil is used in froth flotation process because it does not have an affinity towards water (because of the hydrophobic chemicals as its constituents)and it attracts impurities which can be washed away.
Hence, it is true.