A novel cationic organ silicon collector QAS222 for reverse flotation of bauxite

作者：Yu Xin Yang; Zhong Hong^*; Liu Guang Yi; Su Xiao Ming

来源：Journal of Central South University(Science and Technology), 2011, 42(7): 1865-1872.

• Aluminosilicate minerals
• Bauxite
• Collector
• Quaternary ammonium
• Reverse flotation

The flotation behaviors of diaspore, kaolinite, pyrophyllite illite and their mixture were studied with a novel cationic collector entitled QAS222 and the acting mechnisam of the collector with the minerals was analysed by Zeta potential measuring and FT-IR spectrum analyzing methods. The results indicate that QAS222 is an effective collector in the reverse flotation of bauxite; efficient separations of the mixture at different mass ratios of Al2O3 to SiO2 can be achieved in a slurry of pH=11 at a QAS222 concentration of 4 × 10-4 mol/L. The iso-electric point (IEP) on diaspore surface increases from 6.2 to 10.9 with the addition of QAS222 in the slurry, and these on kaolinite, pyrophyllite and illite are 3.4, 3.0 and 2.5 respectively in the absence of QAS222. Although potentials of the four minerals increase and then decrease at different rates with the increase of slurry pH values, the potential on aluminosilicate minerals are positive in slurry range of pH=2-12, which confirms the flotation results of the minerals. Except for electrostatic adsorptions, formation of hydrogen bond and ammonium absorptions, chemical adsorptions occur between the QAS222 and the kaolinite, pyrophyllite and illite surfaces, which allows for the QAS222 to be strongly absorbed on the mineral surfaces, resulting in their enhanced floatability. However, these actions between the QAS222 and the diaspore surfaces in a slurry of pH=11 is weaker than those between the QAS222 and the kaolinite, pyrophyllite and illite surfaces, and wherein subsequently surface adsorptions cannot be formed, resulting in its bad floatability.

• 出版日期2011
• 单位中南大学