کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1636501 1516952 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Conversion of ferric oxide to magnetite by hydrothermal reduction in Bayer digestion process
ترجمه فارسی عنوان
تبدیل اکسید آهن به مگنتیت با کاهش هیدروترمال در فرآیند هضم بایر
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
چکیده انگلیسی
Digesting aluminum-bearing minerals and converting ferric oxide to magnetite simultaneously in Bayer digestion process is crucially important to deal with high-iron diasporic bauxite economically for alumina production. The reaction behaviors of hydrothermal reduction of ferric oxide in alkali solution were studied by both thermodynamic calculation and experimental investigation. The thermodynamic calculation indicates that Fe3O4 can be formed by the conversion of Fe2O3 at proper redox potentials in alkaline solution. The experimental results show that the formation ratio of Fe3O4 either through the reaction of Fe and Fe2O3 or through the reaction of Fe and H2O in alkaline aqueous solution increases remarkably with raising the temperature and alkali concentration, suggesting that Fe(OH)3− and Fe(OH)4− form by dissolving Fe and Fe2O3, respectively, in alkaline aqueous solution and further react to form Fe3O4. Moreover, aluminate ions have little influence on the hydrothermal reduction of Fe2O3 in alkaline aqueous solution, and converting iron minerals to magnetite can be realized in the Bayer digestion process of diasporic bauxite.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 25, Issue 10, October 2015, Pages 3467-3474
نویسندگان
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