(中南大学 资源加工与生物工程学院, 长沙 410083)
摘 要: 研究了N-(3-氨丙基)-月桂酰胺对高岭石、 伊利石和叶蜡石的浮选性能。 结果表明: N-(3-氨丙基)-月桂酰胺对这些铝硅酸盐都有较好的捕收性能, 对高岭石、 伊利石和叶蜡石的回收率分别在91%, 90%和96%以上。 矿浆pH值对3种矿物的可浮性影响较小, 在一个较宽的pH范围内, 3种矿浆的Zeta电位均为负值, 矿粒表面荷负电。 红外光谱证明, 3种矿物中均含有—OH基。 酸性介质中, 捕收剂分子通过静电引力吸附在矿粒表面; 碱性介质中,捕收剂分子通过氢键吸附在矿粒表面。 矿粒的扫描电镜照片表明: 叶蜡石颗粒主要呈薄片状; 伊利石和高岭石颗粒呈不规则形状。
关键字: 铝硅酸盐矿物; N-(3-氨丙基)-月桂酰胺; 浮选; 吸附
(1. School of Resources Processing and Bioengineering,
Central South University, Changsha 410083, China;
2. Technology Development and Exchange Center of Nonferrous Metallurical Industry,Beijing 100841, China)
Abstract: The effects of sulfide minerals such as sphalerite, pyrite, ganela, chalcopyrite and sulfur on the growth and activity of wild and adapted acidithiobacillus ferrooxidans were studied under the common bioleaching condition of 30℃ and pH2.0. Experimental results show that the rates of oxidizing Fe2+ decrease in the 9K medium which contains sulfide minerals at four kinds of pulp density(0.25%,0.50%,0.75%,1.0%) respectively. This means that sulfide minerals used in this experiment have effects on the growth and activity of wild and adapted acidithiobacillus ferrooxidans.
Key words: sulfide minerals; pulp density; acidithiobacillus ferrooxidans; oxidation activity; bad effect