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Metallurgy: Extracting Metals from Ores

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Questions and Answers

What is the primary purpose of the concentration of ores?

To remove unwanted impurities from the ore (correct)
To purify the metal
To crush and powder the ore
To isolate the metal from its concentrated ore

What is the term used to describe the removal of unwanted materials from the ore?

Isolation
Dressing or benefaction (correct)
Purification
Concentration

Which of the following factors is considered when selecting a method of concentration?

Only the physical properties of the compound
The type of metal, available facilities, and environmental factors (correct)
Only the type of metal
Only the available facilities

What is the term used to describe the unwanted materials present in an ore?

Gangue (A) Signup and view all the answers

What is the purpose of crushing, powdering, and grading the ore before concentration?

To make the ore more manageable (B) Signup and view all the answers

What is the principle behind the hydraulic washing method of ore concentration?

difference in gravities of ore and gangue particles (D) Signup and view all the answers

Which of the following methods is based on the difference in the magnetic properties of ore components?

Magnetic separation method (A) Signup and view all the answers

What is the first step involved in the extraction and isolation of metals from ores?

Concentration of the ore (A) Signup and view all the answers

In the hydraulic washing method, what happens to the heavier ore particles?

they are left behind (A) Signup and view all the answers

What is the purpose of the electromagnetic roller in the magnetic separation method?

to carry away the magnetic component (D) Signup and view all the answers

Which of the following methods is based on the difference in the wetting characteristics of ore and gangue?

Froth floatation method (B) Signup and view all the answers

What is the common application of the hydraulic washing method?

concentration of tin and lead ores (B) Signup and view all the answers

What is the primary function of collectors in the removal of gangue from sulphide ores?

To enhance the non-wetting ability of mineral particles in water (D) Signup and view all the answers

What is the purpose of froth stabilisers in the removal of gangue from sulphide ores?

To stabilise the froth (A) Signup and view all the answers

Why is leaching used in metallurgical processes?

To separate soluble constituents of a mixture (B) Signup and view all the answers

What is the purpose of adjusting the proportion of oil to water in the removal of gangue from sulphide ores?

To separate sulphide ores of different metals (D) Signup and view all the answers

What is the result of the agitation of the mixture in the removal of gangue from sulphide ores?

Froth formation and carrying of mineral particles to the top (D) Signup and view all the answers

What is the purpose of depressants in the removal of gangue from sulphide ores?

To separate sulphide ores of different metals (B) Signup and view all the answers

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