مطالعه سینتیکی فروشویی اسیدی وانادیم از کان‌سنگ مگنتیتی ساغند یزد

نوع مقاله: مقاله پژوهشی

نویسندگان

1 پژوهشکده‌ی مواد و سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران ـ ایران

2 دانشکده‌ی مهندسی شیمی، دانشگاه صنعتی بابل، صندوق پستی: 484، بابل ـ ایران

چکیده

در این پژوهش، سازوکار بازیابی وانادیم از کان­سنگ مگنتیتی ساغند یزد به وسیله کربنات سدیم به عنوان اکسیدان و تکنولوژی فرایند فروشویی اسیدی مورد بررسی  قرار گرفت و هم­چنین تأثیر پارامترهای مختلف بر روی سینتیک انحلال وانادیم بررسی گردید. نتایج نشان داد که درجه حرارت تشویه، زمان تشویه و کربنات سدیم به عنوان عامل تشویه و هم­چنین درجه حرارت فروشویی، زمان فروشویی، اندازه ذرات کان­سنگ، غلظت اسید و نسبت مایع به جامد از عوامل بسیار مهم در بازده استخراج وانادیم از کان­سنگ می­باشند. پارامتر­های بهینه فرایند شامل درجه حرارت °C 1000، زمان 2 ساعت و مقدار نمک کربنات سدیم 40 درصد وزنی در فرایند تشویه در نظر گرفته شد، هم­چنین درجه حرارت °C 90، زمان 5 ساعت، اندازه ذرات کم­تر از 100 میکرون، غلظت اسید 4 مولار و نسبت مایع به جامد 1-mL.g 1/10 در فرایند فروشویی به دست آمد. با توجه به بررسی سینتیکی فرایند فروشویی وانادیم بر اساس مدل SCM، چنین نتیجه شد که کنترل­کننده واکنش فرایند فروشویی، نفوذ داخل ذره­ای می­باشد. بنابراین فرایند فروشویی وانادیم از مدل سینتیکی 3/2(X-1)-X3/2-1 = KD tپیروی می­کند. هم­چنین انرژی اکتیواسیون فرایند برابر با 19/2 کیلو کالری بر مول حاصل گردید ­که با مقادیر تئوری گزارش شده برای حالتی که نفوذ داخل ذر­ه­ای کنترل­کننده واکنش است، مطابقت دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Acid leaching kinetic study of vanadium from Saghand –e- Yazd magnetite ore

نویسندگان [English]

  • D. Ghoddocy Nejad 1
  • A.R. Khanchi 1
  • M. Taghizadeh 2
1 Materials and Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 11365-8486, Tehran - Iran
2 Chemical Engineering Department, Babol University of Technology, P.O.Box: 484, Babol - Iran
چکیده [English]

In the present research, the vanadium recovery mechanisms from Saghand –e- Yazd magnetite ore by sodium carbonate was studied as oxidant and acid leaching technology, and also the effect of the different parameters on the kinetics of the vanadium dissolution was investigated. The results showed that the temperature of roasting, the time of roasting  , sodium carbonate as the factor of roasting, as well as the temperature of leaching, time of leaching, size of ore particles, sulfuric acid concentration, and liquid to solid ratio are very important factors in the efficiency of vanadium extraction from ore. Optimum parameters in roasting process were considered temperature: 1000 °C, roasting  time: 2 h, sodium carbonate: 40 wt% (additive roasting), also leaching temperature: 85 °C, leaching time: 4 h, particle size: smaller than 100 microns the concentration of sulfuric acid: 4 M and liquid to the solid ratio: 10/1 mL/g were obtained in the leaching process. According to the kinetic study of the vanadium leaching based on SCM model, it was concluded that the control effect of the leaching process is intra-particle penetration. Therefore, the vanadium leaching process follows the 1-2/3X-(1-X)2.3 kinetic model. Also, the activation energy of the process was 2.19 kcal per mole, which corresponds to the reported theoretical values for the state in which the intra-particle penetration controls the process

کلیدواژه‌ها [English]

  • Vanadium
  • Kinetic
  • Roasting
  • Leaching
  • Activation energy
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