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سنگ آهن، با توجه به درجه اکسیداسیون به چهار صورت به نام های: اکسید آهن هماتیت ؛ لیمونیت و ماگماتیت و به رنگ های قرمز ؛ زرد و سیاه در طبیعت یافت می شود و در صورت داشتن عیار بالای,%۴۰ معمولا به عنوان ذخیره معدنی استنباط شده و استحصال آن مقرون بصرفه می باشد . استخراج سنگ آهن با روش روباز و پلکانی صورت می گیرد . بدین صورت که ابتدا توسط دریل واگن عملیا...
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یک پیام ارسال کرد