The Synthesis Of Composite Cationic Collector And Its Aluminum Silicate Mineral Flotation Performance Study

In this paper, the synthesis of Silicone quaternary ammonium salt composite cationic collectors and flotation properties of minerals, such as diaspore, kaolinite, pyrophyllite and illite have been studied.The composite cationic collectors QAX223,QAX224,QAX225 and QAX226 were synthesized from fatty amine and silane coupling agents with KI as catalyst, using X-oil as solvent by one-step.The influence of different technical parameters, such as time, temperature and solvent usage on the resurts were studied. The best conditions were obtained as followings:the mole ratio of fatty amine:silane coupling agents:KI=l: 1.1:0.01, the temperature reaction is 110℃, the reaction time lasts for 20 hours. The products were characterized by IR and GC-MS.The results of flotation tests indicate that the flotation recoveries of the four aluminosilicate minerals are all up to 85%, in pH=6～10, using QAX224 as collector, with the concentration of 300mg/L. However, by adding starch as depressant, when the dosage of the depressor was increased to 300mg/L, nearly all diaspore could be depressed in a wide range of pH while silicate minerals were slightly activated. The A/S of the artificial mixed minerals of diaspore and kaolinite can increased 30.79 by the flotation test.The real mineral ratio of Al₂O₃ to SiO₂ can be increased by 5.7 to 9.58 by open circuit test at a pH value of 10, using sodium carbonate as regulator, QAX224 as collector, starch as depressant and terpenic oil as frother. It is possible to separate the diaspore from the silicate minerals such as kaolinite, pyrophyllite and illite under consumption starch 1 kg/t and collector dosage 1.4k g/t.Theζ-potential results show that the isoelectric points(IEP)of diaspore, kaolinite, illite and pyrophyllite are about 6.5,4.4,4.0and 3.3, respectively.The results of Contact angle measurements show that the order of the surface hydrophobicity of aluminosilicate minerals is kaolinite,illite,pyrophyllite,diaspore(from high to low),ζ-potential and IR spectrum measurements show that the interaction between composite cationic surfactants and diaspore is static adsorption, a chemical bonding also occurred in addition to physical action between the collector and silicate. Hydrogen-bonding interaction may play more important role for adsorption between starch and aluminosilicates .