Adsorption mechanism and flotation behavior of ammonium salt of N-Nitroso-N-phenylhydroxyamine on malachite mineral
Adsorption mechanism and flotation behavior of ammonium salt of N-Nitroso-N-phenylhydroxyamine on malachite mineral
复制标题
N-亚硝基-N-苯基羟胺铵盐对孔雀石矿物的吸附机理及浮选行为
DOI：
10.1016/j.apsusc.2022.152489
复制
发表时间：
2022-01-20
影响因子：
6.7
通讯作者：
Sun, Wei
中科院分区：
文献类型：
--
作者：
Wang, Chengwen;Sun, Lei;Sun, Wei
研究了孔雀石与带有NH4+基团和亚硝胺极性基团的N-亚硝基-N-苯基羟胺(NBH)铵盐的特定有机配体之间的吸附机理。敲击模式原子力显微镜 (AFM) 成像表明，当孔雀石在 pH 9.5 的碱性条件下在 NBH 溶液中处理时，孔雀石表面覆盖了纳米级的不规则突起。这表明NBH对孔雀石表现出良好的亲和力，并且吸附密度与NBH的浓度相关。基于铜氨理论以及傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）的结果，孔雀石与NBH相互作用的中间转变过程可概括为活化、扩散还原、结合和再沉积。从氨活化的孔雀石表面去除的铜离子与 NBH 共振结构结合形成二齿和单齿配合物。最终，这些微观分析通过宏观浮选试验得到证实。浮选回收表明配体-Cu络合物的形成增强了孔雀石在三相体系中的疏水性。因此，在浮选实验中使用NBH作为捕收剂选择性分离孔雀石和脉石矿物是可行的。
The adsorption mechanism between malachite and a specific organic ligand of the ammonium salt of N-Nitroso-N-phenylhydroxyamine (NBH) with the NH4+ group and nitrosamine polar group has been studied. The tapping mode atomic force microscopy (AFM) imaging illustrated that irregular protrusions were covered on malachite surface at the nanoscale when malachite was treated in NBH solutions under alkaline conditions at pH 9.5. It indicated that the NBH displayed an excellent affinity to malachite, and the adsorption density was correlated with the concentration of NBH. Based on copper ammine theory and the results of Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), the intermediate transition process of the interaction between malachite and NBH can be summarized as activation, diffusion and reduction, combination, and redeposition. The copper ions removed from the ammonia-activated malachite surface combined with the NBH resonating structures to form the bidentate and monodentate complexes. Eventually, those microscopic analyses are confirmed by the macroscopic flotation test. The flotation recovery illustrated the formation of ligand-Cu complex strengthened the hydrophobicity of malachite in a three-phase system. Therefore, it is feasible using NBH as collector to selectively separate malachite from gangue minerals in flotation experiments.