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?

    <p>To remove impurities from the ore</p> Signup and view all the answers

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

    <p>To agitate the mixture and create bubbles</p> Signup and view all the answers

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

    <p>The method of separating the ore from the impurities</p> Signup and view all the answers

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

    <p>To attract the sulphide particles and carry them to the surface</p> Signup and view all the answers

    What is the final product of the electromagnetic separation process?

    <p>A concentrated ore with impurities removed</p> Signup and view all the answers

    What is the advantage of the froth flotation process?

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

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

    <p>To pass the powdered ore over the magnetic roller</p> Signup and view all the answers

    What is the definition of roasting?

    <p>Heating the ore in the presence of air</p> Signup and view all the answers

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

    <p>It is non-magnetic in nature</p> Signup and view all the answers

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

    <p>Roasting and Calcination</p> Signup and view all the answers

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

    <p>To collect the froth</p> Signup and view all the answers

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

    <p>It settles down at the bottom of the tank</p> Signup and view all the answers

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

    <p>To attract the sulphide particles and carry them to the surface</p> 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?

    <p>Gravitational force</p> Signup and view all the answers

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

    <p>Heavy oxide ores</p> Signup and view all the answers

    What is the purpose of the Electromagnetic Separation Process?

    <p>To remove magnetic impurities from ores</p> 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?

    <p>Gravity Separation Process</p> Signup and view all the answers

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

    <p>They are washed away with the flow of water</p> Signup and view all the answers

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

    <p>Tin ore</p> 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?

    <p>Electromagnetic Separation Process</p> Signup and view all the answers

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

    <p>Roasting Process</p> 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.

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