بررسی مقایسه‌ای مکانیزم و سینتیک لیچینگ اسیدی کنسانتره اسفالریت در حضور نمک‌های مختلف آهن

نوع مقاله : علمی-پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده مهندسی معدن، دانشگاه صنعتی امیرکبیر، تهران

2 استادیار، دانشکده مهندسی معدن، دانشگاه صنعتی امیرکبیر، تهران

3 استاد، دانشکده مهندسی معدن، دانشگاه صنعتی امیرکبیر، تهران

چکیده

کانسنگ‌های حاوی اسفالریت به عنوان منبع اصلی تولید فلز روی، به دلیل وجود لایه غیرفعال گوگردی دارای انحلال ضعیفی در اسید سولفوریک است. در این تحقیق، بررسی مقایسه‌ای مکانیزم و سینتیک لیچینگ اسیدی کنسانتره اسفالریت در حضور نمک‌های آهن از جمله نیترات، کلرید و سولفات آهن انجام شده است. برای این کار، یک کنسانتره اسفالریت، حاوی 23/41 درصد روی، 15/26 درصد گوگرد و 06/6 درصد آهن مورد بررسی قرار گرفت. پارامترهای نوع نمک اکسیدکننده، غلظت اسید سولفوریک، دما، زمان، نسبت جامد به مایع و نرخ تزریق اکسیژن مورد بررسی قرار گرفتند. نتایج حاکی از آن است که پارامترهای دما، نسبت جامد به مایع و غلظت یون فریک بیشترین تاثیر را بر نرخ انحلال اسفالریت داشته است. در شرایط بهینه،‌ غلظت اسیدسولفوریک 51/0 مولار، آهن فریک 9/0 مولار، نرخ تزریق اکسیژن 2 لیتر بر دقیقه، دمای واکنش 90 درجه سانتی‌گراد، زمان 12 ساعت و نسبت جامد به مایع 50 گرم بر لیتر، بازیابی روی برابر 85/94 درصد به دست آمد. بررسی سینتیکی نشان داد، بر اساس مدل هسته کوچک شونده، نحوه کنترل نرخ لیچینگ اسفالریت طبق مکانیزم نفوذ به دلیل ضریب همبستگی بالاتر نسبت به مکانیزم واکنش شیمیایی است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

A Comparative Study on the Mechanism and Kinetics of Acidic Leaching of Sphalerite Concentrate in the Presence of Different Iron Salts

نویسندگان [English]

  • M. Tirgham 1
  • H. Kamran Haghighi 2
  • M. Irannajad 3
1 M.Sc Student, Dept. of Mining Engineering, Amirkabir University of Technology, Tehran, Iran
2 Assistant Professor, Dept. of Mining Engineering, Amirkabir University of Technology, Tehran, Iran
3 Professor, Dept. of Mining Engineering, Amirkabir University of Technology, Tehran, Iran
چکیده [English]

As the main resource of zinc metal production, zinc sulfide mineral has poor sulfuric acid dissolution due to an inactive sulfur layer. This research has done a comparative study on the mechanism and kinetics of acid leaching of sphalerite concentrate in the presence of iron salts such as nitrate, chloride, and iron sulfate. For this purpose, studies were done on a sphalerite concentrate containing 41.23% Zn, 26.15% S, and 6.06% Fe. The investigated parameters include ferric ion concentration, sulfuric acid concentration, temperature, time, solid-to-liquid ratio, and oxygen injection rate, each evaluated at 5 levels. The results indicate that the parameters of temperature, solid-liquid ratio, and ferric ion concentration had the greatest effect on the sphalerite dissolution rate. In the optimal conditions of sulfuric acid concentration 0.51 M, ferric iron 0.9 M, oxygen injection rate 2 L/min, reaction temperature 90°C, time 12 h, and the solid-to-liquid ratio of 50 g/L, recovery of zinc was obtained to be 94.85%. Kinetic investigations showed that, based on the shrinking core model, the sphalerite leaching rate control is based on the diffusion mechanism due to the high correlation coefficient compared to the chemical reaction mechanism.

کلیدواژه‌ها [English]

  • Sulfide concentrate
  • Zinc
  • Atmospheric leaching
  • Ferric ion

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سابقه مقاله

  • تاریخ دریافت: 22 اسفند 1402
  • تاریخ بازنگری: 05 تیر 1403
  • تاریخ پذیرش: 01 مرداد 1403

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