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| Reduction mechanism of SiO2 and counter measures of over-reduction |
| QIN Jie1,2，QI Jian-ling1，LIU Gong-guo1，LI Zhan-jun1 |
（1. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization， Pangang Group Research Institute Co.， Ltd.， Panzhihua 617000， Sichuan， China
2. College of Materials Science and Engineering， Chongqing University， Chongqing 400030， China） |
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Abstract In order to solve technical problems and improve production efficiency， works have been carried out in time. In the smelting process of V-Ti metallized pellets with EAF， SiO2 can be over reducted easily， which will lead to a series of problems， such as unsmooth smelting process in EAF， difficult vanadium recovering from the hot metal， etc. In order to solve these problems， the effects of reactants， smelting temperature and smelting time on SiO2 reduction were studied. Then countermeasures were proposed， including binder optimization， control of deoxidizer adding amount， reduction of reaction temperature and smelting time. With these countermeasures， the technical indicators were improved obviously in the sixth campaign of the furnace. The accepted ratio of hot metal composition is above 85%，[w(V)]and[w(Si)]in vanadium-bearing hot metal are not less than 0.35% and not more than 0.5%， respectively.
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Received: 03 May 2017
Published: 21 December 2017
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2017, Vol. 52 
