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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 5    October 2003

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Reverse flotation separation on diaspore and kaolinite in the presence of cationic polyacrylamide polymers
LIU Guang-yi(刘广义), ZHONG Hong(钟 宏),
LU Yi-ping(卢毅屏), FENG Qi-ming(冯其明)

College of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, China

Abstract:Based on the analyses of crystal structures and surface properties of diaspore and kaolinite, an effective diaspore depressant, CPAM(cationic polyacrylamide) polymers was discovered by single minerals tests, separation experiments of artificial mixed minerals, zetapotential and adsorption measurement. The reverse flotation separation on diaspore and kaolinite can be carried out using collector dodecylamine acetate and depressant CPAM under pH5.5-8.5. On the surfaces of diaspore, there are a large amount of active aluminum atoms. They can bond with-C(O)NH2groups in CPAM and make the -CH2N+(CH3)3 groups in CPAM orient toward the outer surfaces of diaspore, which prevents a majority of the dodecylamine cations from adsorbing on diaspore, enhances hydrophilicity of diaspore, and depresses the floatability of diaspore. But for kaolinite, CPAM polymers have little effect on its floatability.

 

Key words: cationic polyacrylamide; reverse flotation; diaspore; kaolinite

ISSN 1672-7029
CN 43-1423/U

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