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Robust adsorption of ellagic acid on galena surface for efficient flotation separation of molybdenite and galena
Applied Surface Science ( IF 6.3 ) Pub Date : 2024-12-17 , DOI: 10.1016/j.apsusc.2024.162117
Honghu Tang, Xiongxing Zhang, Yong Zeng, Zhongbao Hua, Wei Sun, Li Wang, Feng Jiang
Applied Surface Science ( IF 6.3 ) Pub Date : 2024-12-17 , DOI: 10.1016/j.apsusc.2024.162117
Honghu Tang, Xiongxing Zhang, Yong Zeng, Zhongbao Hua, Wei Sun, Li Wang, Feng Jiang
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The efficient flotation separation of molybdenite and galena is challenging due to their similar surface chemical properties. In this study, ellagic acid (EA), a biodegradable small molecule, was investigated as a novel depressant for selectively modifying the surface chemistry of galena in its flotation separation from molybdenite. Flotation experiments revealed that EA effectively depressed galena at pH 9, while maintaining molybdenite recoveries above 90%. In artificially mixed mineral tests, molybdenum recovery in the froth exceeded 98%, while lead recovery dropped to 6.34%. Surface chemistry analyses, including zeta potential and contact angle measurements, revealed that EA preferentially adsorbed onto the galena surface, decreasing its hydrophobicity and hindering collector adsorption. Solution chemistry calculations and UV spectroscopy identified the doubly deprotonated form of EA as the dominant species at pH 9. Further insights from FT-IR, XPS, and DFT calculations confirmed that EA chemisorbs onto galena through specific deprotonated sites, forming a Pb–cO–C chelate structure, which selectively modifies galena’s surface properties and enhances the wettability contrast between galena and molybdenite. These findings suggest that EA has strong potential as an environmentally friendly alternative to conventional galena depressants.
中文翻译:
鞣花酸在方铅矿表面的稳健吸附,用于辉钼矿和方铅矿的高效浮选分离
由于辉钼矿和方铅矿的表面化学性质相似,因此高效的浮选分离具有挑战性。在这项研究中,鞣花酸 (EA) 是一种可生物降解的小分子,作为一种新型抑制剂进行研究,用于选择性改变方铅矿在从辉钼石的浮选分离中的表面化学。浮选实验表明,EA 在 pH 值为 9 时有效抑制了方铅矿,同时将辉钼矿回收率保持在 90% 以上。在人工混合矿物测试中,泡沫中的钼回收率超过 98%,而铅回收率下降到 6.34%。表面化学分析,包括 zeta 电位和接触角测量,表明 EA 优先吸附在方铅矿表面,降低了其疏水性并阻碍了捕收剂吸附。溶液化学计算和紫外光谱确定 EA 的双去质子化形式是 pH 值为 9 时的优势物质。来自 FT-IR、XPS 和 DFT 计算的进一步见解证实,EA 通过特定的去质子化位点化学吸附到方铅矿上,形成 Pb-cO-C 螯合物结构,选择性地改变方铅矿的表面特性并增强方铅矿和辉钼矿之间的润湿性对比。这些发现表明,EA 作为传统方铅矿抑制剂的环保替代品具有巨大潜力。
更新日期:2024-12-17
中文翻译:

鞣花酸在方铅矿表面的稳健吸附,用于辉钼矿和方铅矿的高效浮选分离
由于辉钼矿和方铅矿的表面化学性质相似,因此高效的浮选分离具有挑战性。在这项研究中,鞣花酸 (EA) 是一种可生物降解的小分子,作为一种新型抑制剂进行研究,用于选择性改变方铅矿在从辉钼石的浮选分离中的表面化学。浮选实验表明,EA 在 pH 值为 9 时有效抑制了方铅矿,同时将辉钼矿回收率保持在 90% 以上。在人工混合矿物测试中,泡沫中的钼回收率超过 98%,而铅回收率下降到 6.34%。表面化学分析,包括 zeta 电位和接触角测量,表明 EA 优先吸附在方铅矿表面,降低了其疏水性并阻碍了捕收剂吸附。溶液化学计算和紫外光谱确定 EA 的双去质子化形式是 pH 值为 9 时的优势物质。来自 FT-IR、XPS 和 DFT 计算的进一步见解证实,EA 通过特定的去质子化位点化学吸附到方铅矿上,形成 Pb-cO-C 螯合物结构,选择性地改变方铅矿的表面特性并增强方铅矿和辉钼矿之间的润湿性对比。这些发现表明,EA 作为传统方铅矿抑制剂的环保替代品具有巨大潜力。