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حذف سولفات تحت شرایط زهاب اسیدی معدن با استفاده از پیلارد نانو بنتونیت آلومینیوم و آهن | ||
| نشریه مهندسی منابع معدنی | ||
| مقاله 5، دوره 3، شماره 3 - شماره پیاپی 9، آذر 1397، صفحه 57-75 اصل مقاله (2.52 M) | ||
| نوع مقاله: علمی-پژوهشی | ||
| شناسه دیجیتال (DOI): 10.30479/jmre.2018.1522 | ||
| نویسندگان | ||
| شیما برکان1؛ والح آقازاده* 2 | ||
| 1دانشجوی دکتری، گروه مهندسی معدن، دانشکده مهندسی معدن، دانشگاه صنعتی سهند، تبریز | ||
| 2دانشیار، گروه مهندسی معدن، دانشکده مهندسی معدن، دانشگاه صنعتی سهند، تبریز | ||
| تاریخ دریافت: 26 تیر 1397، تاریخ بازنگری: 19 مرداد 1397، تاریخ پذیرش: 21 آذر 1397 | ||
| چکیده | ||
| سولفات موجود در زهاب اسیدی، در غلظتهای بالا به عنوان یکی از آلایندههای شیمیایی مطرح است؛ به طوری که عدم توجه کافی به حذف سولفات اثرات نامطلوبی برای موجودات زنده به همراه داشته است و حتی به تاسیسات آب و فاضلاب آسیب جدی وارد میکند. در این تحقیق، برای حذف سولفات از فرآیند جذب به عنوان یک روش موثر و در عین حال ساده و کم هزینه استفاده شده است. با توجه به اهمیت کانی‌های رسی به عنوان یک جاذب طبیعی و سازگار با محیط زیست، اصلاح آنها برای بهبود خواصشان همراه با ایجاد تخلخلهای دایمی بسیار کاربردی است. از آنجایی که در سال‌های اخیر توجه به پیلارد رس‌ها افزایش یافته است، در این پژوهش سعی شد با اصلاح خواص ساختاری نانو بنتونیت، جاذبی به صورت پیلارد شده با ترکیبی از فلزات آهن و آلومینیوم به دست آید. در این راستا، برای افزایش تعداد پیلارها، بهبود خواص جذبی، کاهش میزان مصرف آب و زمان سنتز این جاذب، از تابشهای مایکروویو و امواج اولتراسوند استفاده شد که در مقایسه با نمونه بنتونیت اولیه به جاذب موثری با ظرفیت جذب بالا دست یافته شد. در ادامه با بررسی اثر تغییرات دمایی و تطابق آن با دادههای ایزوترمی جذب فرندلیچ، لانگمویر و تمکین، ثابت ترمودینامیکی فرآیند محاسبه شد و نشان داد که فرآیند جذب با هر دو نمونه بنتونیت اولیه و پیلارد شده خود به خودی و گرمازا است. با توجه به تطابق دادهها با مدلهای سینتیکی شبه مرتبه دوم و مدل نفوذ درون ذرهای، مکانیزم اصلی جذب به صورت جذب سطحی شیمیایی همراه با نفوذ به داخل حفرات جاذب به ویژه در نمونه پیلارد شده است. | ||
| کلیدواژه‌ها | ||
| نانو بنتونیت؛ پیلارد نانو بنتونیت آلومینوم و آهن؛ حذف سولفات؛ جذب | ||
| عنوان مقاله [English] | ||
| Sulfate removal from acid mine drainage using Al, Fe-pillared nano bentonite | ||
| نویسندگان [English] | ||
| Sh. Barakan1؛ Valeh Aghazadeh2 | ||
| 1Ph.D Student, Dept. of Mineral Processing, Faculty of Mining Engineering, Sahand University of Technology, Tabriz | ||
| 2Associate Professor, Dept. of Mineral Processing, Faculty of Mining Engineering, Sahand University of Technology, Tabriz | ||
| چکیده [English] | ||
| High concentration of sulfate in acid mine drainage is one of chemical pollutants which can cause various health problems and damage the wastewater piping systems if not enough attention is given to its removal. In this research, adsorption process was selected as an effective, simple and low-cost method for sulfate removal. The modification of clay minerals as a natural and environmently-friendly adsorbent is very useful for improving their properties along with permanent porosity. In recent years, pillared clay has been received much attention. In this study, the structural properties of Al, Fe-pillared nano bentonite is improved by using the combined ultrasonic wave and microwave irradiation technology. In this adsorbent, the synthesis duration time and water consumtion are reduced and the number of active sites are increased. As a result, an effective adsorbent is produced with high absorption capacity compared to the initial bentonite sample. In this study, the thermodynamic parameters was calculated by examining the effect of temperature, while the adsorption data are fitted by Freundlich, Langmuir and Temkin isotherm models. The thermodynamic results showed that the adsorption process for both initial and pillared bentonite were exothermic and spontaneous. Second-order kinetic models and intra-particle diffusion model demonstrated that the main adsorption mechanism was chemical absorption with penetration into the absorbent porous media, especially in the pillared sample. | ||
| کلیدواژه‌ها [English] | ||
| Nano bentonite, Pillared Al-Fe nano bentonite, Sulfate removal, Adsorption | ||
| مراجع | ||
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