پديد آورنده :
نصيري، يوسف
عنوان :
بررسي اثر افزودني اكسيد منگنز بر تشكيل و پايداري سمنتيت طي فرآيند احياي مستقيم هماتيت
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
استخراج فلزات
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
سيزده،82ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
مسعود پنجه پور، مهدي احمديان
توصيفگر ها :
آهن , كاربيد آهن , كربوراسيون , منگنز و اكسيد منگنز
تاريخ نمايه سازي :
17/4/93
استاد داور :
محمود مرآتيان، رحمت اله عمادي
چكيده انگليسي :
To Study the Effect of Manganese Oxide Additive on the Formation and Stabilization of Cementite During the Direct Reduction of Hematite Process Nasiri Yousef January 22 2014 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiDr Masoud Panjepour Assoc Prof Supervisor Email panjepour@cc iut ac irDr Mehdi Ahmadian Assist Prof Supervisor Email Ahmadian@cc iut ac ir AbstractIn the recent years iron carbide is considered as a new material with high carbon content forsteelmaking process This is due to special features of cementite such as being non flammable easy transportation and storage and high carbon content which is useful as a source of energy Asthermodynamic view iron carbide is a metastable phase which can decompose to metallic ironand graphite Hence the effective parameters on the stability of cementite were studied in therecent decades The results showed that temperature atmosphere kind of the iron ore andadditives are the most important parameters in the stability Among the additives Mn and MnO 2have received less attention Therefore the effect of Mn and MnO 2 on the formation and stabilityof cementite during reduction and carburizing process of iron ore was surveyed in this study First hematite powder with 5 and 10 wt Mn and MnO 2 was mixed where 10 naphtha was added as acold binder Raw samples with 9 and 5mm diameter and height respectively were compressedunder 500N force and sintered for 4 hours at 900 C Reduction and carburizing processes wereperformed in a packed bed reactor at 750 C for different times of reaction where atmospherecontained 10 Ar 30 CH4 and 60 H2 The weight analysis results showed that hematite wasreduced to iron and then carburized Based on these results after 5min reduction process ofhematite more than 95 wt iron was produced The formed iron as a catalyst for dissociation ofmethane to form activated atomic carbon was the main reason of carburizing with a acceptablerate of reaction Increasing time of process increased the formed cementite in the samples wherethe maximum amount of cementite was formed at 15 min The studies showed that Mn increasedthe rate of reduction while MnO 2 has a opposite effect Increasing the amount of Mn from 5 wtto 10 wt has not a significant effect on reduction rate but the MnO2 has a significant effect onthis process Mn increased the stability and the rate of cementite formation and MnO2 juststabilized the carbide Also microstructure studies showed that the formed carbide in puresamples with no additives has a Layer and massive morphology while Mn and MnO 2 change thismorphology to the spherical form Keywords Iron Iron carbide Reduction Carburization Hematite Manganese manganese Oxide
استاد راهنما :
مسعود پنجه پور، مهدي احمديان
استاد داور :
محمود مرآتيان، رحمت اله عمادي
