What is the purpose of zone refining, Chemistry

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What is the purpose of zone refining? In a binary phase diagram (pressure omitted), what is the maximum number of phases which can coexist for at least one degree of freedom? 

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Zone Refining :  Zone  refining  process  is  based  on the  fact  that  first  solid  to crystallize in a two component system is normally purer than liquid as impurity by repeating the sequence of operations a few times.

Max. No. of Phases:  Two

 


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