Research on the Relationship of Three Amine Collectors Structure and Their Flotation Performances on Three Aluminosilicate
There was a large reserve of bauxite resources in China. And these resources were mainly the diaspore-bauxite and contained plenty of aluminosilicate including kaolinite, illite and pyrophyllite. Reducing the contents of aluminosilicate would be significant to the using of Chinese bauxite resources.In this paper, from the single mineral flotation experiments, the surface properties and flotation behaviours of aluminosilicate including kaolinite, illite and pyrophyllite, using dodecyl amine (DDA), N,N-dimethyl-dodecyl amine (DRN12) and N-dodecyl-1, 3-propane diamine (DN12) as collectors, had been investigated. The flotation results shown that the flotation behaviours of aluminosilicate had been influenced greatly by three amine collectors; and the effect was in the order of DN12＞DRN12＞DDA.On the basis of FT-IR spectra and zeta potential measurements, the ionization of surface hydroxyl,as well as isomorphic exchange of surface ions, accounted for the mineral surface charges. And the mechanisms of interactions between the mineral surface and collectors mainly included two modes:electrostatic adsorption and hydrogen bonding; for the DDA and DRN12, the mechanism was mainly electrostatic adsorption; and for the DN12, the mechanisms of electrostatic adsorption and hydrogen bonding both existed.Results of quantum chemistry research shown that the collecting ability of amine collectors was greatly influenced by the electro-negativity of N in the amine molecules; and The |EHOMO| and △E (EHOMO-ELUMO) of N atom in DRN12 and DN12 were lower than that of DDA, and the positive charge of -N group in DRN12 and DA12 were higher than that of DDA. All these calculation results could explain the collecting power of DN12＞DRN12＞DDA.
Bauxite Amine-collectors Floatation Aluminosilicate Electrostatic adsorption Quantum chemistry
X. F. Cao C. M. Liu Y. H. Hu
School of Mineral Processing and Bioengineering, Central South University, Changsha, China
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
1513-1517
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）