Magnetic Separation of Wolframite

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Questions and Answers

What is the primary purpose of the magnetic roller in the electromagnetic separation process?

To mix the ore with water and oil

To crush the ore into smaller particles

To attract the non-magnetic impurities

To separate the magnetic ore from the non-magnetic impurities (correct)

Which minerals are separated using the electromagnetic separation process?

Pyrite and ZnS

Magnetite and SnO2

Iron and manganese from tin-stone ore

All of the above (correct)

What is the characteristic of sulphide particles that makes them suitable for the froth floatation process?

They have a low melting point

They have a high density

They have a tendency to attach to oil bubbles (correct)

They are non-magnetic in nature

What is the purpose of roasting in the concentration of ore?

To remove impurities from the ore Signup and view all the answers

What is the role of compressed air in the froth flotation process?

To agitate the mixture and create bubbles Signup and view all the answers

What is the main difference between the electromagnetic separation process and the froth floatation process?

The method of separating the ore from the impurities Signup and view all the answers

What is the purpose of the oil in the froth flotation process?

To attract the sulphide particles and carry them to the surface Signup and view all the answers

What is the final product of the electromagnetic separation process?

A concentrated ore with impurities removed Signup and view all the answers

What is the advantage of the froth flotation process?

It is a low-cost process with efficient mineral separation Signup and view all the answers

What is the purpose of the belt in the electromagnetic separation process?

To pass the powdered ore over the magnetic roller Signup and view all the answers

What is the definition of roasting?

Heating the ore in the presence of air Signup and view all the answers

What is the characteristic of wolframite that makes it suitable for the electromagnetic separation process?

It is non-magnetic in nature Signup and view all the answers

What are the two types of chemical processes mentioned in the text?

Roasting and Calcination Signup and view all the answers

What is the purpose of the basin in the froth flotation process?

To collect the froth Signup and view all the answers

What is the role of the gangue material in the froth flotation process?

It settles down at the bottom of the tank Signup and view all the answers

What is the purpose of adding oil to the mixture in the froth flotation process?

To attract the sulphide particles and carry them to the surface Signup and view all the answers

What is the primary force responsible for the separation of metallic particles from gangue in the Gravity Separation Process?

Gravitational force Signup and view all the answers

Which type of ore is commonly concentrated using the Gravity Separation Process?

Heavy oxide ores Signup and view all the answers

What is the purpose of the Electromagnetic Separation Process?

To remove magnetic impurities from ores Signup and view all the answers

What is the name of the process in which the crushed ore is treated with a running stream of water?

Gravity Separation Process Signup and view all the answers

What happens to the light particles of gangue in the Gravity Separation Process?

They are washed away with the flow of water Signup and view all the answers

What type of ore contains impurities that are magnetic in nature and cannot be removed by other methods?

Tin ore Signup and view all the answers

What is the name of the process in which the crushed ore is treated with an electromagnetic field to separate the magnetic impurities?

Electromagnetic Separation Process Signup and view all the answers

Which of the following processes is not mentioned in the text?

Roasting Process Signup and view all the answers

Study Notes

Electromagnetic Separation Process

Wolframite (FeWO4) is removed from the ore by allowing powdered ore to fall on a belt passing over a magnetic roller.
The magnetic roller attracts the magnetic nature of the ore, causing it to fall in a heap, while the non-magnetic tin-stone is collected in another heap.
This process is used to separate magnetite, pyrite from ZnS, and roasted iron and manganese from tin-stone, SnO2 from impurities like tungstates.

Gravity Separation Process

Crushed ore is treated to a running stream of water, where light particles of gangue are washed away, and heavy metallic particles settle down at the bottom due to gravitational forces.
This process is used to concentrate heavy oxide ores, such as tin-stone, haematite, and noble metals.

Froth Floatation Process

This process is used to concentrate sulphide ores, such as galena (PbS), Zinc blend (ZnS), and copper pyrites (CuFeS2).
Sulphide particles attach to oil bubbles, and the mixture is agitated with compressed air, causing the sulphide particles to float to the surface and form froth.
The impurities are wetted by water and settle at the bottom of the tank.
The oils used for this process are pine oil, cresylic oil, and sometimes alcohol.

Chemical Process

There are two types of chemical processes: Roasting and Calcination.
Roasting is the process of heating the ores in the presence of air to a temperature at which the ores do not melt.

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Description

This quiz is about the process of magnetic separation of wolframite from ore. It involves the use of a magnetic roller and a belt to separate the magnetic and non-magnetic components.