تشویه قلیایی در مخلوط گل‌قرمز-سدیم کربنات پس از آسیاکاری

نوع مقاله : علمی-پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مهندسی مواد، دانشکده فنی و مهندسی، دانشگاه یاسوج، یاسوج

2 دانشیار، گروه مهندسی مواد، دانشکده فنی و مهندسی، دانشگاه یاسوج، یاسوج

3 استادیار، گروه مهندسی مواد، دانشکده فنی و مهندسی، دانشگاه یاسوج، یاسوج

چکیده

در این پژوهش پس از تهیه نمونه گِل قرمز از شرکت آلومینای ایران (جاجرم) و تعیین ویژگی‌های آن، آزمایش‌های شیمیایی و فازیابی به روش‌های XRF و XRD انجام شد. سپس آسیاکاری مکانیکی مخلوط‌های گل قرمز-کربنات سدیم در زمان‌های 15 دقیقه، 2 ساعت و 5 ساعت صورت پذیرفت. آزمون‌های گرماسنجی هم‌زمان بر روی نمونه گل قرمز و مخلوط‌های حاصل از آسیاکاری در اتسمفر هوا تا دمای حدود 900 درجه سانتی‌گراد و با نرخ گرمایش 20 درجه در دقیقه انجام شد. کاهش جرم نمونه گل قرمز حدود 25/13 درصد و برای مخلوط‌های آسیاکاری در بازه 23 تا 26 درصد قرار دارد. تشویه قلیایی مخلوط‌ها نیز با گرمایش در محدوده دمایی ‌600 تا 900 درجه سانتی‌گراد، تحت فشار یک اتمسفر و به‌مدت یک ساعت انجام شد. نشانه فازهای NaAlO2، NaAlSiO4 و ‌NaFeO2 در الگوهای XRD نمونه‌های حاصل از تشویه قلیایی مشاهده شد. در مخلوط‌های گل قرمز-کربنات سدیم حاصل از آسیاکاری، این فازها شناسایی نشدند و پهن‌شدگی نقاط اوج نمودار و از بین رفتن نشانه کربنات سدیم با افزایش زمان آسیاکاری، رویداد غالب بود. فروشویی نمونه‌های تشویه‌شده با آب در دمای حدود 80 درجه سانتی‌گراد و زمان ‌60 دقیقه منجر به انحلال فاز NaAlO2 گردید و نشانه‌ای از این فاز در باقی‌مانده جامد پس از فروشویی مشاهده نشد. غلظت آهن در محلول‌های حاصل از فروشویی به روش آزمون جذب اتمی بسیار ناچیز بود. نتایج نشان داد در اثر تشویه قلیایی گل قرمز با کربنات سدیم و انحلال محصول جامد تشویه در آب، امکان جداسازی آلومینیوم از آهن و یا ترکیبات محتوی آهن فراهم می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Alkaline Roasting of a Red Mud–Sodium Carbonate Mixture After Milling

نویسندگان [English]

  • V. Niknezhad 1
  • N. Setoudeh 2
  • R. Hayati 2
  • Sh. Pashangeh 3
1 M.Sc Student, Dept. of Materials Engineering, School of Engineering, Yasouj University,Yasouj, Iran
2 Associate Professor, Dept. of Materials Engineering, School of Engineering, Yasouj University, Yasouj, Iran
3 Assistant Professor, Dept. of Materials Engineering, School of Engineering, Yasouj University, Yasouj, Iran
چکیده [English]

After preparing a red mud sample from Iran Alumina Company (Jajarm) and determining its parameters, the chemical analysis and phase evaluations were undertaken using XRF and XRD methods. Mechanical milling of red mud-sodium carbonate mixtures was done for 15 minutes, 2 and 5 hours. STA analysis of the red mud sample and as-milled mixtures was undertaken under an air atmosphere up to 900 ºC with a heating rate of 20 ºC/min. The results showed the mass loss of red mud is about 13.25%, whilst it is in the range of 23-26% for milled mixtures. The alkaline roasting was done by heating the mixtures at the temperature range of 600-900 ºC under an air atmosphere for one hour. The traces of NaAlO2, NaAlSiO4 and NaFeO2 phases were observed in the XRD patterns of the alkaline roasted samples. The signs of these phases were not observed in the milled mixtures of red mud-sodium carbonate; however the peak broadening and disappearing of the signs of sodium carbonate were the major events with increasing the milling time. Leaching of the alkaline roasted samples with water at 80 ºC for 60 minutes resulted in the dissolution of NaAlO2 phase, and the traces of this phase are not observed in the solid residues after leaching. The iron concentration was trace in the leached solutions by the AAS method. The results indicated that alkaline roasting of red mud with sodium carbonate, followed by dissolving the roasted solid products in water, makes it possible to separate the contained aluminium from iron and iron compounds.

کلیدواژه‌ها [English]

  • Bauxite
  • Bayer process
  • Mechanical milling
  • Red mud
  • Sodium Aluminate

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سابقه مقاله

  • تاریخ دریافت: 13 خرداد 1404
  • تاریخ بازنگری: 22 آذر 1404
  • تاریخ پذیرش: 12 شهریور 1404

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