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صنعت فولاد - معرفی فرآیند گندله سازی سنگ آهن

معرفی فرآیند گندله سازی سنگ آهن

پنجشنبه 10 شهریور 1390 04:33 ب.ظ

نویسنده : علی فروزان
ارسال شده در: گندله سازی ،

گندله سازی یكی از روش های تبدیل ذرات و نرمه مواد اولیه به توده هایی از فاز متراكم است. گندله محصول نهایی فرایند گندله سازی و ماده اولیه برای فرایندهای تولید آهن خام در كوره بلند و تولید آهن اسفنجی به روش های متعدد احیای مستقیم میباشد. برای كاربرد گندله باید كیفیت آن جهت حمل و نقل مطلوب باشد.

در اصطلاح متداول گندله یعنی گلوله های تولید شده از سنگ آهن و سایر مواد افزودنی كه نخست خام و سپس سخت و یا پخته می شود و برای احیا به روش سنتی تولید آهن در كوره بلند و یا روش های متعدد احیای مستقیم به كار می رود. چون گندله، ماده اولیه برای تولید آهن خام است، لذا باید در كوره های احیا، ویژگی مكانیكی - شیمیایی و حرارتی مطلوبی را داشته باشد.

مراحل تولید گندله به روش سنتی از طریق ساخت و تولید گندله خام و پخت آن در مراحل زیر صورت می گیرد:

1- ایجاد جوانه بین ذرات مرطوب بار اولیه گندله در اثر پیوند هیدرولیكی یا شیمیایی، رشد جوانه ها، ایجاد گلوله و رشد آن و تولید گندله خام (كه این مرحله پس از آماده سازی مواد خام و مخلوط كردن آنها در مخلوط كن ها به همراه افزودنیهای لازم نظیر بنتونیت و ... صورت می گیرد)

2- خشك نمودن گندله خام، حذف رطوبت در اثر حرارت

3- پخت گندله خشك شده و تحكیم پیوند بین ذرات گندله در اثر اتصال های سرامیكی

4- سرد نمودن گندله پخته شده




دیدگاه ها : () 




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