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प्रश्न
What is the role of flux in metallurgical processes?
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उत्तर
The ores, even after concentration, contain some gangue. To remove gangue, certain substances are mixed with concentrated ore which combine with the gangue to form a fusible material which is not soluble in molten metal. The substances used are called fluxes.
Fluxes are classified as:
(i) Acidic flux and
(ii) Basic flux. Acidic flux removes basic impurities while basic flux removes acidic impurities.
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संबंधित प्रश्न
Choose the correct answer from the options given below:
Aluminum powder is used in thermite welding because
A. It is a strong reducing agent
B. It is a strong oxidizing agent
C. It is corrosion resistant
D. It is a good conductor of heat
What is galvanization? How does it protect iron from rusting?
How does aluminum react with the Air ?
How does aluminum react with the Acid ?
State a reason why zinc is used in:
cosmetics?
Explain
Nitric acid can be stored in aluminium containers
State the use of:
cast iron
Name an alloy of aluminium used in aircraft construction.
Name an alloy of copper in electrical appliances or household vessels.
Explain the following term:
Ores
A tapping vessel opens in a tank-like container that is tapering on the lower side. The tank has an outlet for water on the upper side and a water inlet on the lower side. Finely ground ore is released in the tank. A forceful jet of water is introduced in the tank from lower side and gangue particles and pure ore are separated by this method.
- The above description is of which gravitation separation method?
- Draw a labelled diagram of this method.
Name the following:
The kind of welding in which aluminium powder is used.
Give reason for the following:
Galvanized metal ions should not be used for storing food.
Define the term : Charge
Write the name and formula of two ores of the following: Aluminium
Give composition and uses of the following alloys. Mention the reason for its use.
Brass
Give the name and formula of an ore of zinc.:
Roasting of the ore
The metals zinc and tin are present in the alloy
Name : The processes involved in Refining of ores
Name the processes involved in dressing of the ores.
