Surface Chemistry Features in the Flotation of KCI
Despite the successful industrial practice to recovery KCI by flotation, the adsorption state of collectors at KCI salt surfaces is still not fully understood. In this paper, the captive bubble contact angle measurements at KCI and NaCI crystal surfaces in their saturated solutions are reported. The influence of different collectors and their concentration are considered. The results show that both cationic and anionic collectors produce a hydrophobic state at the structure breaking KCI salt surface, with finite contact angle values of between 30° and 40°. In contrast, the contact angle at the structure making NaCl salt surface is zero at all collector concentrations, suggesting that no collector adsorption occurs, a supposition that is supported by results from molecular dynamics simulation (MDS). Further, it appears that the presence of surface defects such as edges and comers promote the adsorption of collectors at the KCI surface, and that the flotation is achieved by bubble attachment at the edges/comers of KCI particles with the formation of aeroflocs.
KCI flotation Contact angle Adsorption Molecular dynamics simulation
F. Q. Cheng Y. N. Zhang H. Du J. Liu J. Nalaskowski J. D. Miller
Shanxi University, Taiyuan, China Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, U.
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
1243-1254
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）