Metallurgy Principles and Processes
Chemistry ⇒ Metals and Non-metals
Metallurgy Principles and Processes starts at 9 and continues till grade 12.
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Describe the process of leaching with an example.
Explain the role of a flux in metallurgy.
Explain why carbon cannot be used to reduce aluminium oxide to aluminium.
Explain why highly electropositive metals are extracted by electrolytic reduction.
Name the chemical used as a depressant in the froth flotation process for separating lead sulphide (PbS) from zinc sulphide (ZnS).
Name the process used to purify copper by making use of electricity.
State one reason why froth flotation is not suitable for oxide ores.
A sample of bauxite contains 60% Al₂O₃. Calculate the mass of pure Al₂O₃ in 250 kg of the ore.
Which of the following is a flux used in the extraction of iron?
(1) Silica
(2) Limestone
(3) Sodium chloride
(4) Charcoal
Which of the following is a method of refining metals?
(1) Zone refining
(2) Roasting
(3) Smelting
(4) Leaching
Which of the following is not a method of ore concentration?
(1) Froth flotation
(2) Roasting
(3) Magnetic separation
(4) Hydraulic washing
Which of the following is not a step in the extraction of a metal from its ore?
(1) Concentration of ore
(2) Roasting or calcination
(3) Alloying
(4) Reduction
During electrolytic refining of copper, the pure metal is deposited at the ________.
In the blast furnace, the function of limestone is to remove ________ as slag.
In the extraction of zinc from zinc blende (ZnS), the ore is first converted to ________ by roasting.
Roasting is carried out in the presence of ________.
State whether the following statement is true or false: 'All ores are minerals, but all minerals are not ores.'
True or False: Calcination is the process of heating an ore in the absence of air to remove volatile impurities.
True or False: Gangue refers to the impurities present in the ore.
True or False: The Hall-Héroult process is used for the extraction of aluminium.
