Explain the role of iodine in refining of zirconium
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Zirconium is produced by adding gaseous zirconium tetrachloride to molten magnesium metal.(In the absence of air).The end product is always contaminated with magnesium and it doesn't take much magnesium to make it brittle.
At one temperature iodine would react with zirconium metal to form zirconium tetraiodide & that at a higher temperature the tetraiodide would decompose to zirconium metal & free iodine.
First step,zirconium in the cladding is reacted with elemental iodine at 300-500°C to form volatile Zrl4,which,in the second step,is then decomposed at>1100°C.
Formation Zr+4l2→Zrl4 300-500°C
Decomposition Zrl4→Zr+4l2>1100°C
At one temperature iodine would react with zirconium metal to form zirconium tetraiodide & that at a higher temperature the tetraiodide would decompose to zirconium metal & free iodine.
First step,zirconium in the cladding is reacted with elemental iodine at 300-500°C to form volatile Zrl4,which,in the second step,is then decomposed at>1100°C.
Formation Zr+4l2→Zrl4 300-500°C
Decomposition Zrl4→Zr+4l2>1100°C
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