مطالعه تغییرات فاز و شرایط تشکیل فاز آلومینات سدیم در فرایند تشویه قلیایی بوکسیت در شرایط آسیاکاری مکانیکی و گرمایش

مهندسی متالورژی و مواد

مقاله 3، دوره 36، شماره 1 - شماره پیاپی 37، فروردین 1404، صفحه 29-48   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jmme.2025.90200.1166

نویسندگان

امید نوری کوهانی؛ نادر ستوده^* ؛ راضیه حیاتی

گروه مهندسی مواد، دانشکده فنی و مهندسی، دانشگاه یاسوج، یاسوج، ایران.

چکیده

آسیاکاری مکانیکی مخلوط‌های‌بوکسیت-کربنات سدیم با آسیای سیاره‌ای در زمانهای گوناگون‌ (15 دقیقه،‌2‌و5 ساعت) انجام شد. آزمونهای STA در اتمسفر هوا با نرخ گرمایش‌20 درجه در دقیقه تا دمای‌900 درجه سانتیگراد انجام شد.کاهش جرم نمونه بوکسیت حدود‌13% و برای مخلوط‌های ‌بوکسیت-کربنات سدیم در محدوده‌30-27% بدست آمد.گرمایش همدما در اتسمفر هوا، زمان یک ساعت و دماهای گوناگون انجام شد.لیچینگ نمونه‌های پس از گرمایش در دمای 900 درجه سانتیگراد با محلول سودسوزآور (NaOH, 0.1M) در دمای 80 درجه سانتیگراد و زمان یک ساعت برای انحلال فاز آلومینات سدیم انجام شد. نشانه‌های آلبیت، بوهمیت و هماتیت در الگوهایXRDمخلوط‌ پس از آسیاکاری مشاهده شدنداما در محصولات پس از گرمایش، فازهای‌آلومینات سدیم و سیلیکات سدیم‌آلومینیم شناسایی شدند. با افزایش دما و یا مقدار کربنات سدیم، نشانه‌های آلومینات سدیم در محصولات پس از گرمایش غالب بود.فازهای آلبیت و هماتیت در باقی‌مانده‌ جامد پس از لیچینگ شناسایی شدند. تغییرات فازها نیز در ریزساختارهای میکروسکوپی نمونه‌های پس از گرمایش و لیجینگ، ارزیابی شدند.

کلیدواژه‌ها

آسیاکاری مکانیکی؛ اکسیدآلومینیم؛ بوهمیت؛ تشویه قلیایی؛ آلومینات سدیم

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