بررسی تاثیر مصرف آهن و اکسیدکننده بر انحلال کنسانتره گالن در محیط فلوئوروبوریک اسید

نویسندگان

1 دانشجوی کارشناسی ارشد گروه مهندسی معدن، دانشکده فنی و مهندسی، دانشگاه بین‌المللی امام خمینی (ره)

2 استادیار گروه مهندسی معدن، دانشکده فنی و مهندسی، دانشگاه بین‌المللی امام خمینی (ره)

3 دانشیار گروه مهندسی مواد، دانشکده فنی و مهندسی، دانشگاه زنجان

چکیده

استخراج سرب از کنسانتره فلوتاسیون سرب با استفاده از فلوئوروبوریک اسید مورد مطالعه قرار گرفت و به عنوان یک فرآیند بالقوه و امیدوارکننده برای جایگزینی روش‌های تولید پیرومتالورژیکی سرب بهینه‌سازی شد. محتوای سرب، روی و آهن کنسانتره با استفاده از روشXRF به ترتیب 57/66، 5/50 و 1/55 درصد بود. پنج عامل کنترلی شامل غلظت اولیه HBF4، مقدار آهن افزودنی، میزان  اکسیدکننده مصرفی، دمای واکنش و زمان واکنش هرکدام در چهار سطح با استفاده از روش تاگوچی در نظر گرفته شد. آرایه متعامد L16 و آنالیز واریانس (ANOVA) برای تعیین شرایط بهینه و مهم‌ترین عامل‌های موثر بر استخراج روی از کنسانتره گالن به کار گرفته شد. آنالیز واریانس مشخص کرد که مقدار عامل اکسیدکننده و مقدار افزودنی مصرف ‌شده به ترتیب موثرترین پارامترهای فروشویی­اند. بنا به مطالعات گذشته این نتیجه می‌تواند مرتبط با لزوم تشکیل و حضور فلوئوبورات فریک و همچنین اکسایش یون فروس به فریک در سیستم باشد. نتایج آزمایشات نشان داد که بیشیه استخراج سرب در شرایط بهینه غلظت اسید 5 مولار، آهن مصرفی 46/8 گرم بر لیتر، مصرف عامل اکسیده کننده 33/3 گرم در لیتر و در دمای 80 درجه سانتی­گراد و زمان انحلال 6 ساعت حاصل می ­شود. راندمان بازیابی سرب در شرایط بهینه که با روش تاگوچی پیش‌بینی شده بود، با موفقیت به میزان 94/65 درصد رسید.

کلیدواژه‌ها


عنوان مقاله [English]

Study of the effect of iron and oxidizer on dissolution of galena concentrate in fluoroboric acid

نویسندگان [English]

  • H.R. Niyazi 1
  • G.R. Karimi 2
  • D. Moradkhani 3
1 M.Sc Student, Dept. of Mining Engineering, Imam khomeini International University
2 Assistant Professor, Dept. of Mining Engineering, Imam khomeini International University
3 Associate Professor, Dept. of Mining Engineering, University of Zanjan
چکیده [English]

The extraction of Pb from galena concentrate using fluoroboric acid media was studied and optimized as a potentially promising process to replace lead pyrometallurgical producing processes. The lead, zinc and iron content of the galena concentrate investigated were 57.66%, 5.50% and 1.55% respectively. Five control factors, including initial HBF4 concentration, the addition of iron and oxidizer agent, the reaction temperature and reaction time were considered in four different levels using Taguchi technique. L16 orthogonal array and analysis of variance (ANOVA) were applied to determine the optimum conditions and most significant factors affecting the overall lead extraction from galena concentrate. Analysis of variance indicated that the amount of oxidizer agent used and iron usage were the most influential leaching parameters respectively. According to former studies this result can be related to necessity of formation and presence of ferric fluoborate and also oxidation of ferrous ion to ferric in the system. The optimum dissolution condition to maximize lead extraction were; acid concentration = 5 mol/l, additive usage = 46.8 wt. %, oxidizer agent usage = 3 volume percent, temperature = 80 ºC and time = 6 hrs. Lead recovery efficiency in the optimum conditions predicted by Taguchi method successfully reached to 94.651%.

کلیدواژه‌ها [English]

  • Hydrometallurgy
  • Galena concentrate
  • Fluoroboric Acid
  • Ferric Fluoborate
  • Optimization

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