کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
233149 465326 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The implications of the froth recovery at the laboratory scale
ترجمه فارسی عنوان
پیامدهای بازیابی کف در مقیاس آزمایشگاهی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Lab kinetics tests were conducted at different froth scraping rates.
• It was found that the overall rate constant increases rapidly with faster scraping.
• The findings show that the froth recovery in the lab is much lower than 100%.
• The results cast doubt on the relevance of kc = PSb at normal flotation conditions.

This paper presents a critical review of the role of froth recovery in laboratory flotation kinetics tests. By conducting tests in the standard lab equipment (the Denver cell), it is demonstrated that, for typical scraping rates, the froth recovery is significantly lower than the 100% that is commonly assumed when interpreting lab kinetics data. Furthermore, it is shown that the curve of overall rate constant versus froth residence time, as defined by the scraping rate, is not linear, but increases quickly at faster scraping rates. These findings have important implications for scale-up. For one, differences in froth recoveries at the lab scale can lead to significant error in the modeled plant recoveries. For two, they undermine a key assumption used to derive and validate the linear relationship between collection rate constant and bubble surface area flux. This casts doubt on the assertion that it is only the collection rate—rather than the froth recovery, interface recovery, or some combination thereof—that is responsible for the observed collinearity between the bubble surface area flux and the overall rate constant.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Minerals Engineering - Volumes 66–68, November 2014, Pages 54–61
نویسندگان
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