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| Mechanism and experimental for dephosphorizion and chromium conservation of chromium containing melted iron |
| ZHAO Hai-quan1， 2，QI Yuan-hong1，SHI Yong-lin2，FENG Huan-lin2，NA Xian-zhao1 |
（1. State Key Laboratory of Advanced Steel Processing and Products， Central Iron and Steel Research Institute， Beijing 100081， China
2. Technology Centre， Taiyuan Iron and Steel （Group） Co.， Ltd.， Taiyuan 030003， Shanxi， China） |
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Abstract To solve the problem on the iron utlizion limition as high P，calculation and industry test on dephosphorization and chromium conservation of iron with Cr and Ni was studied，so as stainless steel dust could be recycled by the process of shaft furnace. But the liquid iron smelted by this process had the problem of high phosphorus content， which then led to the use of liquid iron restricted. For realizing dephosphorization and chromium conservation of liquid iron， through calculation， including thermodynamic conditions of the reduction of chrome， nickel and iron oxide and the critical oxygen potentials of phosphorus， chromium and carbon oxidized， three measures were put forward. The measures were using CaO alkaline slag series， controlling oxygen potential and tapping temperature. On the basis of the theoretical calculation， experimental study about dephosphorization and chromium conservation of chromium-nickel containing liquid iron which was smelted by shaft furnace， was carried out in industry. 35 t of chromium-nickel containing liquid iron was smelted in experiment. The results show that when the slag basicity is 1.15， the content of FeO in slag is controlled at about 5%， the tapping temperature is controlld within 1 673-1 684 K， dephosphorization rate could be reached to more than 36%， content of phosphorus in molten iron could be dropped to 0.023%， and Cr yield is over 88%. Experiment indicates that the purpose of dephosphorization and chromium conservation could be achieved by using the measures studied， and the problem of high phosphorus content in liquid iron containing chromium and nickel could be solved.
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Received: 23 March 2017
Published: 21 December 2017
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2017, Vol. 52 
