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Questions and Answers
What is the principle behind zone refining?
What is the principle behind zone refining?
How are impurities separated in zone refining?
How are impurities separated in zone refining?
What is the role of the mobile induction heater in zone refining?
What is the role of the mobile induction heater in zone refining?
Why is zone refining carried out in an inert gas atmosphere?
Why is zone refining carried out in an inert gas atmosphere?
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Which metals are commonly refined by the zone refining process?
Which metals are commonly refined by the zone refining process?
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Study Notes
Zone Refining Principle
- The principle behind zone refining is based on the difference in solubility of impurities in the solid and liquid states of a metal.
- The process involves melting a narrow region (zone) of the metal and slowly moving it through the rest of the metal, allowing impurities to dissolve in the molten zone.
Separation of Impurities
- Impurities are separated in zone refining because they are more soluble in the molten zone than in the solid metal.
- As the molten zone moves through the metal, impurities dissolve in it and are carried away, leaving behind a purer metal.
Role of Mobile Induction Heater
- The mobile induction heater is used to melt the narrow region of the metal, creating the molten zone.
- The heater is moved along the metal to create a continuous process of melting and purification.
Inert Gas Atmosphere
- Zone refining is carried out in an inert gas atmosphere to prevent contamination of the metal by atmospheric gases.
- The inert gas atmosphere also prevents oxidation of the metal, which could lead to impurities.
Metals Refined by Zone Refining
- Zone refining is commonly used to refine metals with high purity requirements, such as silicon, germanium, and certain metals used in semiconductors.
- These metals require high purity to maintain their electrical and thermal properties.
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Description
Test your knowledge of zone refining, a purification technique used for metals. Learn about the principle of fractional crystallization and how impurities are removed from the molten metal. Understand the process of heating and moving the rod to obtain pure metal.
