Abstract In this study, for the first time, we applied ammonium phosphate to pre-treat chrysocolla prior to sulfidization flotation. In addition, we investigated the structural characteristics of the copper sulfide film formed on the chrysocolla surfaces and its response to flotation. Micro-flotation experiments revealed that the addition of (NH4)3PO4 prior to sulfidization greatly improves the floatability of chrysocolla and its recovery increased from 8.71% to 87.97% with butyl xanthate as the collector. The results of the field emission scanning electron microscopy analysis showed that numerous regular fragments appeared on the chrysocolla surfaces after the addition of (NH4)3PO4. The X-ray diffraction and X-ray photoelectron spectrometry analysis confirmed that these fragments were newly formed copper sulfide covering the chrysocolla surfaces, during this process a chemical reaction occurred in the slurry system, i.e. the Cu2+ were reduced to Cu+, the S2− were mainly oxidized to S−, (S2)−, (S2)2−. The copper sulfide species primarily in the form of crystalline covellite (Cu+3(S2)2−S−), which is the key to obtaining good flotation recovery. As a specific activator, (NH4)3PO4 participates in the liquid-solid phase chemical reaction between the sulfidizing reagent and the chrysocolla, which promotes the sulfidization reaction of chrysocolla.

中文翻译：

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磷酸铵对金藻表面硫化铜结晶形成的影响及其对浮选的响应

摘要 本研究首次应用磷酸铵对金藻进行硫化浮选前的预处理。此外，我们研究了金藻表面形成的硫化铜膜的结构特征及其对浮选的响应。微浮选实验表明，硫化前加入(NH4)3PO4大大提高了金藻的可浮性，以黄原酸丁酯为捕收剂，其回收率从8.71%提高到87.97%。场发射扫描电镜分析结果表明，加入(NH4)3PO4后，金球藻表面出现了大量规则碎片。X 射线衍射和 X 射线光电子能谱分析证实，这些碎片是新形成的覆盖在金球藻表面的硫化铜，在此过程中，浆料体系发生化学反应，即Cu2+被还原为Cu+，S2-主要被氧化为S-、(S2)-、(S2)2-。硫化铜物质主要以结晶紫铜 (Cu+3(S2)2-S-) 的形式存在，这是获得良好浮选回收率的关键。(NH4)3PO4作为一种特殊的活化剂，参与硫化剂与金黄藻之间的液固相化学反应，促进了金黄藻的硫化反应。