黏土矿物对泡沫浮选过程有不同的负面影响,如捕收剂对有价值矿物的吸附率低,增加纸浆粘度,以及减少硫化铜的回收率和品位。本研究旨在评估聚苯乙烯基纳米粒子(NPs)用于黄铜矿的泡沫浮选及其减轻蒙脱石对该硫化物回收的负面影响的能力。实验阶段包括制备一种基于聚苯乙烯的纳米颗粒(St-CTAB-VI),通过动态夜间散射(DLS)进行分析以确定其流体动力学尺寸。然后,评估了在存在和不存在蒙脱石(15%)的情况下,NP对黄铜矿角的影响,并与使用戊基黄原酸钾(PAX)以及PAX和NP的混合物获得的接触角进行了比较。此外,zeta电位测量进行了研究之间的相互作用黄铜矿和蒙脱石或NP在固定浓度和微浮选试验进行了不同的时间,以评估黄铜矿的回收率在蒙脱石的存在,使用NP和与PAX的混合物。最后,进行浊度分析作为时间的函数,以评估在存在和不存在黄铜矿的情况下,15%蒙脱石悬浮液中沉降和絮凝现象的发生。纳米粒子,以及NP和PAX的混合物。结果表明,在蒙脱石存在下,NPs和PAX的混合物有助于增加黄铜矿的接触角。这可能与分子和纳米捕收剂的存在有关,这些捕收剂在黄铜矿颗粒上产生了更高的疏水性,有助于减少矿物表面粘土矿物的存在。此外,NPs和PAX的混合物促进了硫化物矿物表面纳米粒子的生成,这有助于分离粘液并促进浮选期间的气泡/矿物附着步骤。
Clay minerals have different negative effects on the froth flotation process such as low adsorption of collectors on valuable minerals, increased pulp viscosity, and the reduction in recovery and grade concentrates of copper sulfides. This study aims to evaluate the use of polystyrene-based
nanoparticles (NPs) for the froth flotation of chalcopyrite and their ability to mitigate the negative effect of montmorillonite on the recovery of this sulfide. The experimental stage consisted of preparing a type of polystyrene-based nanoparticle (St-CTAB-VI), which was analyzed by dynamic night scattering (DLS) to establish its hydrodynamic size. Then, the effect of NPs on chalcopyrite\'s angle\'s in the presence and absence of montmorillonite (15%) was evaluated and compared with the contact angle achieved using potassium amyl xanthate (PAX) and a mixture of PAX and NPs. In addition, zeta potential measurements were carried out to investigate the interactions between the chalcopyrite and the montmorillonite or the NPs under fixed concentrations and microflotation tests were performed employing different times to evaluate the chalcopyrite recovery in the presence of montmorillonite, using NPs and mixtures with PAX. Finally, turbidity analysis as a function of time was performed to evaluate the occurrence of sedimentation and flocculation phenomena in suspensions of 15% montmorillonite in the presence and absence of chalcopyrite,
nanoparticles, and mixtures of NPs and PAX. The results indicated that the mixture of NPs and PAX contributed to increasing the contact angle of chalcopyrite in the presence of montmorillonite. This can be associated with the presence of molecular and nanometric collectors that generated a higher hydrophobicity on the chalcopyrite particles, contributing to reducing the presence of clay minerals on the mineral surface. In addition, the mixture of NPs and PAX promoted the generation of
nanoparticles on the sulfide mineral surface, which helps to detach the slime and facilitate the bubble/mineral attachment step during flotation.