""بررسی اثر نوع و میزان ناخالصی ها در تلفات حرارتی فرایند تف جوشی سنگ معدن منیزیت ""

مهندسی متالورژی و مواد

مقاله 2، دوره 36، شماره 3 - شماره پیاپی 39، شهریور 1404، صفحه 27-38   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jmme.2025.92053.1185

نویسنده

محسن موسوی نژاد^*

گروه مهندسی مواد و متالورژی، دانشکده فنی و مهندسی، مجتمع آموزش عالی گناباد، خراسان رضوی

چکیده

در این مقاله اثر نوع ناخالصی و مقدار آن بر مصرف انرژی در کوره‌های تف‌جوشی منیزیا به کمک مدل‌سازی ترمودینامیکی مورد بررسی قـــرار گرفته است. بررسی های ترمودینامیکی توسط نرم افزار FactSage 6.1 در بازه‌ی دمایی ℃ 2000-800، فشار atm 1 و به صورت هم‌دما انجام شده است. نتایج نشان می دهد، افزایش خلوص سنگ معدن با افزایش مصرف انرژی همراه است. به عنوان مثال در فرایند کلسیناسیون در دمای ℃ 800، افزایش خلوص سنگ معدن از 85% به 100% باعث افزایش 16 درصدی در مصرف انرژی می شود. این در حالیست که با افزایش دمای حرارت‌دهی به ℃ 1900، همان میزان افزایش خلوص باعث افزایش 7% انرژی مصرفی شده است. همچنین امکان تشکیل ترکیبات مذابی همچون SiO2.2MgO در مقادیر بالاتر ناخالصی اکسید سیلیسیم وجود دارد. این موضوع باعث اتلاف حرارتی بیشتر در فرایند تف جوشی می شود. نتایج این تحقیق نشان می دهد، در شرایطی که ناخالصی‌های اصلی سنگ معدن منیزیت، CaO,SiO2 است، می توان با کنترل نسبت CaO/SiO2 در حدود 1.8، علاوه بر کاهش تلفات انرژی در کوره، مانع از تشکیل ترکیبات سیلیکات منیزیمی شده و خلوص MgO در محصول نهایی را افزایش داد.

کلیدواژه‌ها

سنگ معدن منیزیت؛ آنتالپی؛ اکسید کلسیم؛ اکسید سیلیسیم؛ تف جوشی

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