پديد آورنده :
نظري ، محسن
عنوان :
اثر فعال سازي مكانيكي بر احياي كربوترمي ايلمنيت
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
[هشت]،100،[II] ص: مصور ، جدول ، نمودار
يادداشت :
ص. ع به: فارسي و انگليسي
استاد مشاور :
محمد حسن عباسي
توصيفگر ها :
مينرال هاي تيتانيم
تاريخ نمايه سازي :
23/01/1388
استاد داور :
نادر ستوده ، مسعود پنجه پور
چكيده فارسي :
به فارسي و انگليسي : قابل رويت در نسخه ديجيتال
چكيده انگليسي :
AbstractEffect of mechanical activation in high energy ball milling on carbothermic reduction ofilmenite concentrate has been examined by a combination of steady state and dynamictechnique In unmilled mixed of ilmenite graphite sample with increasing temperature upto 1200 C in the rate of 10 C min reduction didn t evident But in milled ilmenite graphitesamples reduction proceed via three stages Reduction initiated with rapid reduction ofilmenite to elemental iron and rutile and followed by slaw reduction of rutile to sub oxides XRD examination of milled samples that reduced in isothermal state indicated thatTi2O3 and Ti3O5 produce at this stage At temperatures up to 1150 C in final stage ofreduction process titanium oxides reduced to titanium carbide The unit cell of Titaniumcarbide increased with increasing time of reduction at constant temperature Becausetitanium carbide that produced in this process is a nonstoichiometric compound and it scarbon content increased with increasing time Longer milling time resulted in lowering ofonset reduction temperature Also with increasing milling time the activation energy ofreduction process reduced especially in first stage Studying of morphology andmicrostructure of sample that milled in 10 hours and reduced in 1300 C indicate thattitanium carbide particles dispersed in iron matrix In milled ilmenite graphite samples in10 hours kinetic parameters and mechanism of reduction at each stage investigated withisothermal technique In first stage chemical reaction in ilmenite carbon or carbonmonoxide was rate controlling steps In second and third stages solid state diffusion andfirst order chemical reaction were rate controlling steps respectively The activationenergies of reduction of ilmenite graphite samples in 10 hours were 278 8 193 3 and530 8Kj respectively Key Words Ilmenite carbothermic reduction mechanical activation Thermogravimetry
استاد مشاور :
محمد حسن عباسي
استاد داور :
نادر ستوده ، مسعود پنجه پور
