Influence of bubble diameter and solids concentration on bubble stability: Development of a novel analytical approach
来源期刊：中南大学学报(英文版)2014年第9期
论文作者：LIU Hong-Jun(刘洪均) ZHANG Wei(张炜) SUN Chun-Bao(孙春宝)
文章页码：3588 - 3595
Key words：bubble diameter; bubble lifetime; thin liquid film; UV-visible
Abstract: The properties and thickness of the bubbles in the froth control the flotation process. There is no work showing how to measure bubble film composition and thickness by a straightforward manner. In this work, a novel approach, a custom-designed bubble cell associated with layer interferometry (in the UV-vis region) and FT-IR spectroscopy was used to investigate the effect of solid particle type (hydrophilic vs hydrophobic), concentration and bubble diameter on stability of a bubble blown in air. Stability was quantified by measuring bubble lifetime and hydrated film thickness. Kerosene with silicone oil as a foaming agent was used to evaluate the impact of bubble diameter (test series I). Frother solutions (MIBC, Dowfroth 250, Hexanol and F-150) were used for the solid type concentration experiments (test series II). In the first series of experiments, it was determined that as the diameter of a bubble increased from 10 to 25 mm, so did the hydrated film thickness from 350 to 1000 nm. In the second series, as the silica concentration increased (0 to 10%), an increase in bubble lifetime and hydrated film thickness was resulted (130%-250%). An impact of solid hydrophobicity was found but to a lesser degree than expected. It is possible that the small particle size (<0.1 m) of silica was responsible for this behavior. The findings are used to interpret the effect of solids in flotation froth.
LIU Hong-Jun(刘洪均)1, 2, ZHANG Wei(张炜)2, SUN Chun-Bao(孙春宝)1
(1. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Department of Business Administration, Chinalco China Copper Corporation Limited, Beijing 100082, China)
Abstract:The properties and thickness of the bubbles in the froth control the flotation process. There is no work showing how to measure bubble film composition and thickness by a straightforward manner. In this work, a novel approach, a custom-designed bubble cell associated with layer interferometry (in the UV-vis region) and FT-IR spectroscopy was used to investigate the effect of solid particle type (hydrophilic vs hydrophobic), concentration and bubble diameter on stability of a bubble blown in air. Stability was quantified by measuring bubble lifetime and hydrated film thickness. Kerosene with silicone oil as a foaming agent was used to evaluate the impact of bubble diameter (test series I). Frother solutions (MIBC, Dowfroth 250, Hexanol and F-150) were used for the solid type concentration experiments (test series II). In the first series of experiments, it was determined that as the diameter of a bubble increased from 10 to 25 mm, so did the hydrated film thickness from 350 to 1000 nm. In the second series, as the silica concentration increased (0 to 10%), an increase in bubble lifetime and hydrated film thickness was resulted (130%-250%). An impact of solid hydrophobicity was found but to a lesser degree than expected. It is possible that the small particle size (<0.1 m) of silica was responsible for this behavior. The findings are used to interpret the effect of solids in flotation froth.
Key words:bubble diameter; bubble lifetime; thin liquid film; UV-visible
