کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4914766 1427718 2018 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of coal ash on ring behavior of iron-ore pellet powder in kiln
ترجمه فارسی عنوان
اثر خاکستر زغال سنگ بر رفتار حلقه پودر پودر سنگ آهن در کوره
کلمات کلیدی
خاکستر زغال سنگ، پودر پودر سنگ آهن کوره روتاری، استحکام اتصال، تشکیل حلقه،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


- Coal ash was employed to research ring behavior of iron-ore pellet powder.
- Ring formation process in coal-fired kiln was analyzed.
- Insufficiency Fe2O3 recrystallization makes pellet powder can't form original ring.
- Glassy silicon oxides and liquation substances make powders form original ring.
- Original ring is evolved to final ring by Fe2O3 recrystallization.

Ring formation as a troublesome problem for grate-kiln production of iron-ore oxide pellet makes the quality of pellet declining, production efficiency reducing, and production cost increasing. Pellet powder and coal ash are the raw material of ring. Bonding strength, microstructure and composition of coal ash, iron-ore pellet powder, and their mixed powder were investigated to analyze the effect of coal ash on ring behavior of pellet powder and observe the forming of powder ring in kiln. Results showed that coal ash not only changes chemical composition of pellet powder, but also influences its bonding process. The proportion of hematite decreases while that of mullite and quartz increases with the rise of coal ash. High temperature (not less than 1250 °C) is a necessary condition to make powder form ring. Fe2O3 recrystallization of pellet powder is the primary manner for powder briquettes. Pure pellet powder is difficult to form ring because of its insufficient Fe2O3 recrystallization at beginning of formation, but their weak bonding can be intensified by coal ash. The combined actions of glassy phase silicide, liquation phase aluminosilicate and liquid phase of low melting substance make the ash briquette with tight structure and high strength in the initial of roasting which is difficult to be destroyed and maintain in rotary kiln as the original ring. Then with the continuous of high temperature roasting, sufficient Fe2O3 recrystallization makes the original ring further strong and unbreakable, and evolve to the final ring which is indestructible and malignant.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Powder Technology - Volume 323, 1 January 2018, Pages 195-202
نویسندگان
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