What is refining. Explain any five methods of refining.
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The process of purifying thecrude metals is called refining.
Distillation: -
This is very useful for low boiling metals like zinc and mercury. The impure metals are evaporated to obtain the pure metals as distillate.
Liquation: -
In this method a low melting metal like tin can be made to flow on a sloping surface, in this way it is separated from higher melting impurities.
Electrolytic refining: - In this method the impure metal is made to act as anode a strip of some metal in pure form is used as cathode . They are put in a suitable electrolytic bath containing soluble salt of the some metals the more basic metal remains in the solution and the less basic ones go to the anode mud.
Anode : M→Mn++ne−M→Mn++ne−
Cathode : Mn++ne−→MMn++ne−→M
Zone refining: -
It is based on the principle that impurities are more soluble in the melt than in the solid state of the metal
Distillation: -
This is very useful for low boiling metals like zinc and mercury. The impure metals are evaporated to obtain the pure metals as distillate.
Liquation: -
In this method a low melting metal like tin can be made to flow on a sloping surface, in this way it is separated from higher melting impurities.
Electrolytic refining: - In this method the impure metal is made to act as anode a strip of some metal in pure form is used as cathode . They are put in a suitable electrolytic bath containing soluble salt of the some metals the more basic metal remains in the solution and the less basic ones go to the anode mud.
Anode : M→Mn++ne−M→Mn++ne−
Cathode : Mn++ne−→MMn++ne−→M
Zone refining: -
It is based on the principle that impurities are more soluble in the melt than in the solid state of the metal
Answered by
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Answer:
the process of separating various constitutes or fractures of petroleum by fractional distillation is called refining .
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