کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
233162 465326 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of particle breakage mechanisms during regrinding on the subsequent cleaner flotation
ترجمه فارسی عنوان
اثر مکانیسم شکستن ذرات در هنگام ریزش بر روی فلوتاسیون پس از آن پس از آن
کلمات کلیدی
رندرینگ، آسیاب غلتکی، آسیاب مخلوط، مکانیزم شکستن ذرات، شناور چالکوسیت
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• A tumbling mill and a stirred mill provide different particle breakage mechanisms.
• Breakage mechanisms influence the collector distribution on particle surfaces.
• Impact breakage causes collector to distribute evenly on newly produced particles.
• Attrition breakage causes collector to be distributed on fine particles.

Stirred mills have been widely used for regrinding, and are acknowledged to be more energy efficient than tumbling mills. These two types of mills present different particle breakage mechanisms during grinding. In this study, the effect of regrinding by both mills on surface properties and subsequent mineral flotation was studied, using chalcocite as the mineral example. A rod mill and a stirred mill with the same stainless steel media were used to regrind rougher flotation concentrates. Different chalcocite flotation recovery was achieved in the cleaner stage after regrinding in tumbling and stirred mills. The factors contributing to the different recovery included particle size, the amount of created fresh surfaces, surface oxidation and the redistribution of collector carried from rougher flotation. All the factors were examined. It was determined that the predominating factor was the different distribution of collector resulting from different particle breakage mechanisms in the stirred and tumbling mills, in line with ToF-SIMS analysis. In the tumbling mill, the impact particle breakage mechanism predominates, causing the collector to remain on the surface of newly produced particles. In the stirred mill, the attrition breakage removes collector from the surface, and decreases particle floatability. Furthermore, the type of grinding media in the stirred mill also influences the subsequent flotation, again due to the change of particle breakage mechanisms. The results of this study demonstrate that the selection of regrinding mills and grinding media should not only depend on the required energy efficiency, but also on the properties of the surfaces produced for subsequent flotation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Minerals Engineering - Volumes 66–68, November 2014, Pages 157–164
نویسندگان
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