Removal of suspensions of fine particles from water by colloidal gas aphrons (CGAs)

被引:25
作者
Mansur, EHA [1 ]
Wang, YD [1 ]
Dai, YY [1 ]
机构
[1] Tsing Hua Univ, State Key Lab Chem Engn, Dept Chem Engn, Beijing 100084, Peoples R China
关键词
separation; colloidal gas apheons; flotation; surfactant;
D O I
10.1016/j.seppur.2005.07.022
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Colloidal gas aphrons (CGAs) are micron-sized gas bubbles produced by stirring surfactant solutions at high speed. A single CGA dispersed in water is composed of a gaseous inner core, surrounded by double water-soapy layer. CGAs have large interfacial area per unit volume and exhibit relatively high stability. These characteristics make CGAs very suitable in flotation systems. Early work on CGA has shown that it has considerable potential in the field of solvent extraction. While the area of application is very broad, is has been used for the flotation of biological products such as microbial cells, removal of ash-forming materials from coal, waste water processing, etc. In this paper, the flotation of magnesium hydroxide (particle size 2.3-9 mu m) and polystyrene (particle size 24-300 mu m) by CGAs has been studied. The effect of particles size on removal efficiency was analyzed. There is an optimum particle and bubble size that will give high removal efficiency. The effect of surfactants type and surfactants concentration on removal efficiency has also been investigated. Results of more than 100 experiments show that CGAs made from ionic surfactants (HTAB, SDBS) is more efficient for the removal of fine particles than that generated from non-ionic surfactant (Tween 20). High removal efficiency can be obtained at surfactant concentration approximately equal to the critical micelle concentration (CMC). Yields higher than 50% of magnesium hydroxide and 97% of polystyrene are reached at surfactant CMCs. (C) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:71 / 77
页数:7
相关论文
共 50 条
  • [31] Magnetic force assisted settling of fine particles from turbid water
    Hong, H. P.
    Kwon, H. W.
    Kim, J. J.
    Ha, D. W.
    Kim, Young-Hun
    PROGRESS IN SUPERCONDUCTIVITY AND CRYOGENICS, 2020, 22 (02): : 7 - 11
  • [32] Coagulative colloidal gas aphrons generated from polyaluminum chloride (PACl)/dodecyl dimethyl betaine (BS-12) solution: Interfacial characteristics and flotation potential
    Lu, Xiaoli
    Zhang, Ming
    Xie, Li
    Zhou, Qi
    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2017, 530 : 209 - 217
  • [33] Oil-in-water Pickering emulsions stabilized by colloidal particles from the water-insoluble protein zein
    de Folter, Julius W. J.
    van Ruijven, Marjolein W. M.
    Velikov, Krassimir P.
    SOFT MATTER, 2012, 8 (25) : 6807 - 6815
  • [34] Fine particle removal from flue gas using emulsion liquid membrane technique
    Ren, Xiaxia
    Li, Hongxia
    Liu, Ce
    Zhao, Mingyu
    Zhang, Junjie
    2019 3RD INTERNATIONAL WORKSHOP ON RENEWABLE ENERGY AND DEVELOPMENT (IWRED 2019), 2019, 267
  • [35] Selective Electrodialysis for Copper Removal from Brackish Water and Coal Seam Gas Water
    Eberhard, F. S.
    Hamawand, I.
    INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH, 2017, 11 (01) : 1 - 11
  • [36] Using Fe(III)-coagulant-modified colloidal gas aphrons to remove bio-recalcitrant dissolved organic matter and colorants from cassava distillery wastewater
    Zhang, Ming
    Xie, Li
    Wang, Zhou
    Lu, Xiaoli
    Zhou, Qi
    BIORESOURCE TECHNOLOGY, 2018, 268 : 346 - 354
  • [37] Improving the removal of fine particles from coal combustion in the effect of turbulent agglomeration enhanced by chemical spray
    Sun, Zongkang
    Yang, Linjun
    Shen, Ao
    Hu, Bin
    Wang, Xiaobei
    Wu, Hao
    FUEL, 2018, 234 : 558 - 566
  • [38] Agglomeration and removal characteristics of fine particles from coal combustion under different turbulent flow fields
    Sun, Zongkang
    Yang, Linjun
    Wu, Hao
    Wu, Xin
    JOURNAL OF ENVIRONMENTAL SCIENCES, 2020, 89 : 113 - 124
  • [39] Membrane gas absorption for CO2 capture from flue gas containing fine particles and gaseous contaminants
    Zhang, Lin
    Qu, Rumin
    Sha, Yan
    Wang, Xia
    Yang, Linjun
    INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL, 2015, 33 : 10 - 17
  • [40] Cold model study on inclusion removal from liquid steel using fine gas bubbles
    Cho, JS
    Lee, HG
    ISIJ INTERNATIONAL, 2001, 41 (02) : 151 - 157