十二烷基三甲氧基硅烷对十二胺浮选铝硅矿物的影响

Effects of Dodecyl-Trimethoxy Silane on Flotation Behavior of Aluminum-Silicate Using Dodecylamine as Collector

通过单矿物浮选实验、动电位测定及红外光谱分析,研究了十二胺(DDA)和十二烷基三甲氧基硅烷(WD-10)2种浮选药剂对一水硬铝石和高岭石的浮选行为和作用机理.结果表明:在酸性条件下,十二胺单独使用时,高岭石的回收率略高于一水硬铝石,两种矿物的可浮性差异不大,不能有效实现高岭石与一水硬铝石的浮选分离;十二烷基三甲氧基硅烷单独使用时对高岭石和一水硬铝石均无捕收作用;与单用十二胺相比,DDA+WD-10的组合捕收剂对硅酸盐矿物浮选能力强,选择性好.在pH=4～5.5的范围及最佳药剂配比条件下,高岭石回收率在75%以上,而一水硬铝石回收率只有20%左右,能有效实现铝硅矿物的反浮选分离.

The floatation tests of the pure minerals,electrokinetic measurements and FTIR spectra analysis were employed to study the flotation behaviors and mechanism of diaspore and kaolinite using dodecylamine （DDA） and dodecyl-trimethoxy （WD-10） as collectors.The results show that the floatability of kaolinite is slightly better than that of diaspore with dodecylamine as a collector under acidic condition,whereas it does not mean the separation of kaolinite and diaspore can be realized due to the weakly difference of their floatability.Both kaolinite and diaspore have poor floatability using WD-10 as a collector.The combined collector performs much better than dodecylamine for kaolinite not only the collecting power,but also the selectivity.In the range of pH of 4-5.5 and under the optimum combination scheme of combined collector,the diaspore recovery is 20%,and the kaolinite recovery is higher than 75%,which can realize the reverse flotation separate for aluminum-silicates.