作　　者： ; ; ; ;

机构地区： 中南大学化学化工学院

出　　处： 《轻金属》 2009年第2期8-12,共5页

摘　　要： 以辛基硫酸胍SAG8为捕收剂,通过浮选实验、Zeta电位和红外光谱测定,研究了SAG8对铝硅酸盐矿物的浮选性能和作用机理。结果表明：在pH为4-12的范围内SAG8对高岭石、叶腊石和伊利石这三种铝硅酸盐都有较好的捕收能力。Zeta电位测得高岭石、伊利石和叶蜡石的等电点分别为3.5、3.0和2.3。矿物与SAG8作用后其表面正电荷密度增加的均不明显。其可能的原因是：胍是有机强碱,当胍分子一个NH^2＋与矿物表面Si-O^-通过静电作用吸附于矿物表面后,由于胍基中还存在一个NH2官能团,它与矿浆中或者矿物表面的OH^-发生氢键作用,矿浆表面OH^-浓度增加,从而使矿物表面正电荷密度增加不明显矿粒表面荷负电。结合浮选实验、Zeta电位和红外光谱可以推断出矿物与SAG8的作用机理：SAG8阳离子中同时存在阳离子型和分子型两种NH2官能团,使得SAG8阳离子以静电力和氢键两种方式吸附铝硅酸盐矿物表面。其中在酸性介质中,SAG8主要通过静电力方式吸附在铝硅酸盐矿粒表面,而在碱性条件下以静电力和氢键两种方式作用。 The flotation mechanism of aluminosilicate minerals using alkytguanidine collectors was studied through flotation experiments, zeta potential measurements and FT - IR spectrum analysis. It has been shown that kaolinite, inite and pyrophyllite all exhibit good floatability with alkylguanidines as collectors under pH 4 - 12. The flotation recoveries rise with the adding of the carbon chain length. Isoelectric point （IEP） is determined to be 3.5, 3.0 and 2.3 for kaolinite, illite and pyrophyllite respectively. However, it is anomalous that the presence of cationic collectors has less influence on the negatively charged mineral surfaces. It is explained by the special structure of guanidine which is one of the strongest base, having two NH2 groups, one of them maybe interact with minerals by electrostatic forces, and another maybe form hydrogen bonding with OH^- ions on the aluminosilicates surfaces or in the aqueous solution, increaseing the density of negative charge on the aluminosilicate surface and leading unpronounced positive charge increase on the aluminosilicate. Combining the flotation tests, zeta potential and FTIR measurements above, the interaction mechanism can be concluded that： the simultaneous presence of cationic and neutral amine groups makes it possible for SAG cation to bind on the three aiuminosilicate mineeals by both electrostatic attraction and hydrogen bonding. While in acidic medium, the interaction of the alkylguanidines on the aluminosilicates surfaces is mainly by means of electrostatic force and hydrogen bond; in the alkaline medium, is by way of electrostatic effect and hydrogen bond.

关 键 词： 铝硅酸盐矿物 辛基胍 泡沫浮选 吸附机理

领　　域： [矿业工程] [矿业工程]