The similar physicochemical properties of stibnite and arsenopyrite resulted in the difficult separation by traditional collectors in flotation. Hence, this study utilized Cu2+ and potassium butyl xanthate (KBX) coordinate assembly to form a novel Cu-KBX complex collector, investigating its properties, conformation, and its role in flotation separation of stibnite and arsenopyrite, as well as its diverse adsorption behavior on mineral surfaces. The stable Cu-KBX complex solution was formed when the molar ratio of Cu2+ to KBX was 1:2, exhibiting a network-like structure at that time. The micro-flotation results showed that at pH 5, the grade of Sb in the concentrate was as high as 61.08 %, with As content at only 4.65 %, enabling effective separation of stibnite and arsenopyrite. Furthermore, the Cu-KBX complex exhibited a reticulated structure at the stibnite surface, while it adhered in a granular fashion on the arsenopyrite surface. FTIR analysis confirmed stronger chemisorption of Cu-KBX onto stibnite compared to arsenopyrite. XPS results indicated that Cu-S was the main collecting component. However, a weak Fe(II)-S substance was found on the arsenopyrite interface, likely due to Fe3+ oxidizing in the slurry with the Cu-KBX complex. Therefore, this disruption of the Cu-KBX complex structure by Fe3+ in arsenopyrite sharply reduced its adsorption on arsenopyrite, enhancing the selective separation of stibnite and arsenopyrite.

中文翻译：

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Cu2+ 配位组件 KBX 捕收器选择性分离辉锑矿和砷黄铁矿的机理


辉锑矿和亚砷黄铁矿的相似物理化学性质导致传统捕收剂在浮选中难以分离。因此，本研究利用 Cu2+ 和丁基黄酸钾 （KBX） 配位组装形成新型 Cu-KBX 络合物收集剂，研究其性质、构象及其在辉锑矿和砷黄铁矿浮选分离中的作用，以及它在矿物表面的不同吸附行为。当 Cu2+ 与 KBX 的摩尔比为 1：2 时形成稳定的 Cu-KBX 络合溶液，当时呈现出网状结构。微浮选结果表明，在 pH 值为 5 时，精矿中 Sb 的品位高达 61.08 %，而 As 含量仅为 4.65 %，能够有效分离辉锑矿和亚砷黄铁矿。此外，Cu-KBX 配合物在辉锑矿表面表现出网状结构，而它以颗粒状方式粘附在砷黄铁矿表面。FTIR 分析证实，与砷黄铁矿相比，Cu-KBX 对辉锑石的化学吸附更强。XPS 结果表明，Cu-S 是主要的收集组分。然而，在砷黄铁矿界面上发现了一种弱的 Fe（II）-S 物质，这可能是由于 Fe3+ 在浆料中与 Cu-KBX 络合物氧化。因此，Fe3+ 在砷黄铁矿中对 Cu-KBX 复合物结构的破坏大大降低了其对砷黄铁矿的吸附，增强了辉锑铁矿和砷黄铁矿的选择性分离。