De-aluminium Process of Pure Iron Raw Materials for Diamond Wire Production

The control technology of Al content in the raw material pure iron for smelting diamond wire using vacuum induction furnace was studied.Four schemes were designed to study the effect of furnace pressure,melting time and refining temperature on the Al content in molten iron after oxygenation and the effect of adding ZrO₂ filter in the tundish on inclusions.The results show that when the pressure in the furnace reaches 15kPa and the melting time is 60min,is not only ensures that the Al content in the iron liquid reaches a low value after the melting period,but also the O content does not increase greatly;when the refining temperature is 1620℃,the Al content in the molten iron reaches the lowest value after refining,which is 22×10^-6;after vacuum degassing,the oxygen content in molten steel is reduced to 100×10^-6.When the ZrO₂ filter is set in the tundish,the purity of pure iron is higher,the number of inclusions in the same area is less,and the size is smaller,the Al content in the ingot is as low as 10×10^-6,and the O content is as low as 37×10^-6.