زمین‌ شیمی و کانی‌ شناسی زغال‌ های ماستریشتین از حوضه‌ های آنامبرا و گنگولای نیجریه: کاربردهایی برای کیفیت زغال، ظرفیت منابع و ویژگی‌ های تجمعی

زمین شناسی اقتصادی

دوره 16، شماره 2 - شماره پیاپی 41، 1403، صفحه 135-161   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.2024.1109

نویسندگان

آیولا یوسف جیموه^{* 1}؛ مریم بلجی²؛ جیموه اجدی³؛ شکیرات مصطفی امینو¹؛ متیو آدلودون اکینپلو⁴

¹دکتری، گروه زمین‌شناسی و علوم معدن، دانشکده علوم محض و کاربردی، دانشگاه ایالت کوارا، مالته، ایالت کوارا، نیجریه

²دانشجوی دکتری، گروه زمین‌شناسی و علوم معدن، دانشکده علوم محض و کاربردی، دانشگاه ایالت کوارا، مالته، ایالت کوارا، نیجریه

³دانشیار، گروه زمین‌شناسی و علوم معدن، دانشکده علوم محض و کاربردی، دانشگاه ایالت کوارا، مالته، ایالت کوارا، نیجریه

⁴دکتری، دانشکده مهندسی عمران، دانشکده مهندسی و فناوری، دانشگاه ایالت کوارا، مالته، ایالت کوارا، نیجریه

چکیده

آنامبرا و گنگولا بخشی از حوضه‌های داخلی رسوبی در نیجریه هستند که با سوخت‌های فسیلی مشخص می‌شوند و نیجریه برای حل مشکل انرژی فعلی خود، تمرکز تولید برق خود را به زغال‌سنگ منتقل‌کرده است. زغال‌های مورد بررسی به ترتیب از دو منطقه آنکپا و مایگانگا در ایالات کوگی و گومبه به دست آمده‌اند. زغال‌ها برای تعیین کیفیت و استفاده و پتانسیل منابع خود مورد بررسی قرار گرفتند. این زغال‌ها با استفاده از تجزیه‌های مجاورتی، نهایی، عناصری، کانی‌شناسی و میکروسکوپی الکترونیکی تجزیه‌شده‌اند. هدف‌ این پژوهش تعیین قابلیت کک‌سازی، رتبه‌بندی، محیط‌های پالئوآنوی، پتانسیل هیدروکربن و تمایل به ذوب‌کردگی زغال‌هاست. مقادیر میانگین محتوای رطوبت، خاکستر، ماده فرار و کربن ثابت برای زغال‌های آنکپا به ترتیب 54/5، 43/16، 45/48 و 71/30 درصد و برای زغال‌های مایگانگا به ترتیب 68/10، 60/8، 33/44 . 41/36 درصد بوده که نشان‌دهنده زغال‌های نون- ککینگ زیربیتومینوس با محتوای فرار بالاست و برای سوخت و تولید برق مناسب هستند. نمودار ون کرولن بر اساس H/C در برابر O/C نشان داد که کروژن نوع IV وجود دارد. نتایجXRD ، نمودارهای همبستگی و مقادیر شاخص مواد آلوده و غیرماده‌ای (DAI) به ترتیب 49/7 و 46/13 برای زغال‌های آنکپا و مایگانگا نشان‌داد که زغال‌های آنکپا با مواد برجایی مانند کوارتز، پیریت و کلسیت غنی شده‌اند؛ در حالی‌که کائولنیت و کوارتز احتمالی مواد آواری در زغال‌های مایگانگا هستند.  به‌ طور خلاصه، تجمع زغال‌های آنکپا بر اساس نسبت اسید/ پایه (B/A)، نسبت سیلیسیم (G)، نسبت سیلیس/ آلومینا (S/A)، نسبت آهن/ کلسیم (I/C)، نسبت کربن/ هیدروژن (C/H) و نسبت کربن ثابت/ ماده تبخیرپذیر (FC/V) به ترتیب نشان‌دهنده تجمع ضعیف، متوسط و قوی برای زغال‌های آنکپا و تجمع قوی برای زغال‌های مایگانگا بود.

کلیدواژه‌ها

تجمع؛ زغال؛ ذرات آواری؛ زمین‌ شیمی؛ مجاورتی

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