Robust adsorption of ellagic acid on galena surface for efficient flotation separation of molybdenite and galena

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Honghu Tang , Xiongxing Zhang , Yong Zeng , Zhongbao Hua , Wei Sun , Li Wang , Feng Jiang
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Abstract

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.

Abstract Image

Abstract Image

鞣花酸在方铅矿表面的强吸附对辉钼矿和方铅矿浮选分离的影响
辉钼矿与方铅矿的表面化学性质相似,对其高效浮选分离具有挑战性。本研究以可生物降解的小分子鞣花酸(EA)作为新型抑制剂,对方铅矿与辉钼矿浮选分离过程中的表面化学进行了选择性修饰。浮选实验表明,EA在pH为9时能有效抑制方铅矿,同时使辉钼矿的回收率保持在90%以上。在人工混合矿物试验中,泡沫中钼的回收率超过98%,而铅的回收率降至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,降低了方铅矿的疏水性,阻碍了捕收剂的吸附。溶液化学计算和紫外光谱分析表明,在pH值为9时,双去质子形式的EA为优势种。FT-IR、XPS和DFT计算进一步证实,EA化学物质通过特定的去质子化位点吸附在方铅矿上,形成Pb-O-C螯合结构,选择性地改变方铅矿的表面性质,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很强的潜力。
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来源期刊
Applied Surface Science
Applied Surface Science 工程技术-材料科学:膜
CiteScore
12.50
自引率
7.50%
发文量
3393
审稿时长
67 days
期刊介绍: Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.
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