عنوان مقاله
اثرTiO2 بر ویسکوزیته و ساختار پسماند در فلزات نوع کوره های حرارت دهی
فهرست مطالب
چکیده
مقدمه
روش های آزمایشی
نتایج و بحث
نتیجه گیری
بخشی از مقاله
مواد و روش ها
با استفاده از دوک دوار متصل به ریومتر دیجی تال بوک فیلد کالبره شده (LVDV-IIþ; Brookfield Engineering Laboratories, Middleboro, MA) ویسکوزیته اندازه گیری شد. جزییات روشهای آزمایشی در منابع دیگر نیز گزارش شده اند با این حال دیاگرام و نمودار شماتیک در شکل 1 نشان داده شده است. نمونه های با وزن 120 گرم بر طبق جدول 1 تهیه شدند و در بوته Rh ده درصد وزنی (H: 60mm, ID: 40mm) قرار گرفتند. درجه حرارت کوره با استفاده از ترموکوپل مرجع کالیبره شده و در چارچوب دمایی +3 درجه با استفاده از کنترل کننده PID کنترل گردید.
کلمات کلیدی:
Effect of TiO2 on the Viscosity and Slag Structure in Blast Furnace Type Slags Hyunsik Park, Jun-Young Park, Gi Hyun Kim, and Il Sohn TiO2 additions up to 10 mass% behaved as a basic oxide and lowered the viscosity in the CaO–SiO2–17 mass% Al2O3–10 mass% MgO-based slags by depolymerizing the silicate network structure. Raman spectroscopy revealed the sum of NBO/Si 1 and 3 decreased while the sum of NBO/Si 2 and 4 increased with TiO2 content. Unlike the silicate structures, the aluminate structures seems to be relatively unaffected by TiO2 additions according to the FTIR results. 5 mass% TiO2 significantly decreased the viscosity compared to the TiO2 free slags, but beyond 5 mass% TiO2 meaningful changes in the viscosity was not observed. From the comparison of the viscosity at constant TiO2 of 5 and 10 mass% and varying CaO/SiO2 ratio, increasing the CaO/SiO2 ratio was more effective in decreasing the viscosity than TiO2 additions. 1. Introduction Cost issues related to integrated steel mill operations and unavailability of high grade raw materials with high concentrations of iron has sparked interest in the use of other potential sources of iron bearing materials once regarded as uneconomical for the present day integrated steel mill operations. In particular, iron ores consisting of significant TiO2 such as ilmenite is comparatively abundant in Australia and other parts of the world. These ores due to the high TiO2 content may result in significant issues such as lower reduction degree of the ore,[1–4] variations in the liquidus temperature of the slag,[5–7] reduced refining capacity of the slag,[8–10] and slag viscosity deviations from optimum processing conditions.[11–15] However, potential benefits of TiO2 in the blast furnace slags have also been realized from work done by Morizane et al.[9] and others.[15–18] By forming a protective layer of titanium carbo-nitride on the refractory brick, the premature failure and erosion of the hearth was found to be inhibited. Thus, both the thermophysical and chemical properties of the slag can change with TiO2 additions and a fundamental understanding on these topics, in particular the effect of viscosity, is essential to maintain and optimize the overall efficiency of the blast furnace operations.
