N-(2-氨乙基)-月桂酰胺浮选铝硅酸盐矿物的研究

Investigation on the Flotation of Aluminosilicates Using N-(2-Aminoethyl)-dodecanamide

研究了N-(2-氨乙基)-月桂酰胺对高岭石、伊利石和叶腊石等铝硅酸盐矿物的浮选行为.发现该表面活性剂对叶腊石的浮选回收率最高可达97.7%,对伊利石和高岭石的回收率相对较低,一般不超过82%.矿浆pH对高岭石、伊利石和叶腊石的回收率影响较小.酸性矿浆中表面活性剂通过静电引力吸附在矿粒表面;碱性矿浆中,表面活性剂通过氢键吸附在矿粒表面.红外吸收光谱证明,三种矿物表面中均存在-OH;在一个较宽的pH范围内,三种矿物矿浆的Zeta电位均为负值,表明矿粒表面荷负电.矿粒的扫描电镜(SEM)照片(×15000)表明,叶腊石主要呈薄片状颗粒,高岭石和伊利石颗粒呈不规则形状.

The present work deals with the effect of N-(2-aminoethyl)-dodecanamide on the flotation behavior of aluminosilicates(including kaolinite, illite and pyrophyllite). It was found that the N-(2-aminoethyl)-dodecanamide made the recovery of pyrophyllite more than 97.7%. The collecting power of N- (2-aminoethyl) dodecanamide for kaolinite and illite are relatively weak, generally, the recovery does not go beyond 82%. The pulp pH has less effect on the recovery of aluminosilicate. In the acidic range, the surfactants were adsorbed on mineral surface mainly by electrostatic forces, while, in the alkaline pulp, they were adsorbed mainly by way of hydrogen bond. The FT-IR spectra give a proof of hydroxyl groups on the aluminosilicates surface. The Zeta potential is negative over a wide pH-range. SEM photographs( x 15000) of aluminosilicate particles show that pyrophyllite particle take the shape of thin slice, but kaolinite and illite are particles with irregular appearance.