New Silicone Flotation Of Al-si Mineral Flotation Performance

A novel organosilicone cationic collector DTS12 with good solubility in water at room temperature was synthesized by methyl chlorosilane and aliphatic amine. The flotation behaviors of diaspore and the main gangue minerals-kaolinite, pyrophyllite and illite with the organosilicon collector and aliphatic amine were studied comparatively. The pure mineral flotation experiments showed that the organic silicone cationic collector DTS12 exhibited strong flotation capability on diaspore, illite, pyrophyllite and kaolinite in the pH range of 6～10. Using DTS12 as collector, with the concentration of 280mg/L, the flotation recoveries of the four aluminosilicate minerals are all over 86%. Research exhibits that the capturing ability of DTS12 is better than that of aliphatic amine under the same concentration.In order to find suitable conditions of bauxite desilication of reverse flotation system, the flotation of the single mineral with the existence of depressor was investigated. The results show that the soluble starch is an effective depressor agent for diaspore. And the depression of soluble starch is much more prominent. The separation of mixed mineral of diaspore and kaolinite by reverse flotation was studied preliminarily in this dissertation. The results show that the artificial mixed mineral of diaspore and kaolinite can be separated well when A/S of feeding mineral is 2.679 (diaspore:kaolinite=2:1) and the concertrate of A/S=15.02 can be obtained when 280mg/L DTS12 is employed as reverse flotation collector and 300mg/L soluble starch being depressor, while the pH value of the system maintained at 8, In addition, the recovery rates of the two ores are both more than 99%,and diaspore can be almost completely inhibited under the action of soluble starch with the flotation difference more than 93% between two ores. In a word, with suitable amount of DTS12 and soluble starch as collector and depressor respectively, diaspore could be effectively separated from kaolinite, illite and pyrophyllite through reverse flotation.The adsorption mechanism of the novel collector on the four minersls has been investigated through Zeta-potential and IR spectrum measurements. The PZC (Point of Zero Charge) of diaspore, kaolinite, illite and pyrophyllite are 6.2,3.6,3.1 and 2.4 respectively, and theζ-potential of kaolinite, pyrophyllite and illite shows a pronounced shift towards more positive zeta potentials in the presence of the collector. The IR spectrums of clay minerals treated by DTS12 both exhibit new peaks around at 3000-2800cm-1, which previously attributes to the stretching bands of-CH3 and -CH2, and no other peak shift was observed. So it can be concluded that the adsorption between organosilicon cationic collector DTS12 and the four aluminosilicates is dominated by physical electrostatic adsorption.