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فلوتاسیون کانسنگ ایلمنیت: تاثیر انحلال سطحی بر سینتیک فلوتاسیون و سینتیک جذب کلکتور | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 11، دوره 52، شماره 6، شهریور 1399، صفحه 1469-1484 اصل مقاله (3.29 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2019.15399.5909 | ||
| نویسندگان | ||
| امید سلمانی نوری1؛ مهدی ایران نژاد* 2؛ اکبر مهدیلو3 | ||
| 1دانشجوی دکترا دانشگاه امیرکبیر | ||
| 2Mining & Metallurgical Eng. Department | ||
| 3دانشگاه امیرکبیر | ||
| چکیده | ||
| اثر انحلال سطحی با اسید اگزالیک بر سینتیک فلوتاسیون و سینتیک جذب کلکتور برای ایلمنیت در حضور کانی‌های گانگ الیوین - پیروکسن، ترمولیت – کلینوکلر و کوارتز بررسی شد. برازش مدل سینتیکی مرتبه اول بر روی نتایج فلوتاسیون قبل و بعد از انحلال سطحی نشان داد که ثابت سینتیک و بازیابی زمان بینهایت ایلمنیت افزایش و این مقادیر برای کانی‌های گانگ کاهش یافته است. اندیس انتخابی سینتیکی ایلمنیت پس از انحلال سطحی در حضور کانی‌های الیوین - پیروکسن، ترمولیت - کلینوکلر و کوارتز به ترتیب از 1/28 به 1/98 ،از 1/42 به3/02 و از 3/05 به 3/58 افزایش یافته است که نشان‌دهنده تاثیر مثبت فرآیند انحلال سطحی است. بررسی نشان داد که جذب کلکتور از مدل سینتیکی مرتبه دوم پیروی می‌کند و پس از انحلال سطحی سینتیک جذب کلکتور و نرخ جذب اولیه کلکتور بر سطح ایلمنیت از 3/85 به8/44 گرم بر مول دقیقه افزایش و برای کانی‌های الیوین - پیروکسن، ترمولیت – کلینوکلر و کوارتز به ترتیب از 6/33 به 5/03 ،از 7/3 به 6/22 و از 7/77 به 7/37 گرم بر مول دقیقه کاهش یافته است. این نتایج با نتایج جذب کلکتور توسط آنالیز فرابنفش مطابقت داشت بطوریکه پس از انحلال سطحی میزان جذب کلکتور روی سطح ایلمنیت افزایش و در مورد کانی‌های گانگ کاهش می‌یابد. نتایج میکروسکوپ الکترونی نشان داد پس از انحلال سطحی، سطح ذرات ایلمنیت هموارتر و یکنواخت تر شده و در مورد کانی‌های گانگ، به دلیل انحلال بیشتر کاتیون‌های سطحی، حفراتی در سطح ذرات ایجاد می‌شود. | ||
| کلیدواژه‌ها | ||
| انحلال سطحی؛ سینتیک؛ فلوتاسیون؛ جذب کلکتور؛ ایلمنیت | ||
| موضوعات | ||
| فرآوری؛ مهندسی معدن و متالورژی | ||
| عنوان مقاله [English] | ||
| Impact of surface dissolution on flotation kinetics and kinetics of collector adsorption on ilmenite ore | ||
| نویسندگان [English] | ||
| Omid Salmani Nuri1؛ mehdi Irannajad2؛ Akbar Mehdilo3 | ||
| 1Amirkabir University of Technology | ||
| 3AUT | ||
| چکیده [English] | ||
| In this study, the effect of surface dissolution by oxalic acid was investigated on the flotation kinetics and kinetics of collector adsorption for ilmenite in the presence of olivine-pyroxene, tremolite-clinochlore and quartz. Fitting of first-order kinetic model on the results of flotation before and after surface dissolution showed that flotation kinetic constant (K) and ultimate recovery (R∞) of ilmenite is increased after surface dissolution and they are decreased for gangue minerals. The results showed that the kinetic selectivity index of ilmenite in the presence of olivine-pyroxene, tremolite-clinochlore and quartz are increased from 1.28 to 1.98, 1.42 to 3.02, and 3.58, respectively, after surface dissolution indicating the positive effect of surface dissolution process. Investigating the kinetics of collector adsorption showed that the collector adsorption is conforming to second[1]order kinetic model. After surface dissolution, the kinetics of collector adsorption and initial rate of collector adsorption on ilmenite surface is increased from 3.85 to 8.44 g.mol-1 min-1 and it is decreased for olivine-pyroxene, tremolite-clinochlore and quartz from 6.33 to 5.03, 7.3 to 6.22 and 7.77 to 7.37 g.mol-1 min-1, respectively. These results are in good agreement with the results of collector adsorption via UV analysis which the collector adsorption on ilmenite surface is increased and it is decreased for gangue minerals after surface dissolution. The results of SEM showed that the surface of ilmenite becomes smoother and uniform and about the gangue minerals, some cavities are produced due to dissolution of surface cations. | ||
| کلیدواژه‌ها [English] | ||
| Surface dissolution, Kinetics, Flotation, Collector adsorption, Ilmenite | ||
| مراجع | ||
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