Question

(A) In a zone refining process, show that the subsequent impurity concentration along the refining direction a is given by: ?"(?) = ??((1 − ?)+,- where c0 is the initial impurity concentration which is uniform throughout the specimen, and k is the partition coefficient.

(B) Silicon is purified by a process of zone refining. If it contains an impurity (1ppm) with a partition coefficient k = 10^-5, how much would remain in the middle of the bar after a zone pass?

Answer 1

You can refer this link: https://books.google.co.in/books?id=fHFogyL7VlkC&pg=PA57&lpg=PA57&dq=Silicon+is+purified+by+a+process+of+zone+refining.+If+it+contains+an+impurity+(1ppm)+with+a+partition+coefficient+k+%3D+10%5E-5,+how+much+would+remain+in+the+middle+of+the+bar+after+a+zone+pass?&source=bl&ots=QOVi40ddLJ&sig=UC4RFc_5WuDEai1rsWYLnS3CyYE&hl=en&sa=X&ved=2ahUKEwiOtpfHr5reAhUKXCsKHW23DhEQ6AEwAnoECAcQAQ#v=onepage&q=Silicon%20is%20purified%20by%20a%20process%20of%20zone%20refining.%20If%20it%20contains%20an%20impurity%20(1ppm)%20with%20a%20partition%20coefficient%20k%20%3D%2010%5E-5%2C%20how%20much%20would%20remain%20in%20the%20middle%20of%20the%20bar%20after%20a%20zone%20pass%3F&f=false