Flotation separation of galena and chalcopyrite by using hydroxyl radicals from an Fe2+/NaClO system as depressants

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Haiyu Zhang, Qinbo Cao, Yan Yan, Heng Zou, Xingguo Huang, Dianwen Liu
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Abstract

The flotation separation of galena (PbS) and chalcopyrite (CuFeS2) is not yet fully resolved due to the lack of efficient depressants. This study proposed a new depressant, i.e. an Fe2+/NaClO system, as an efficient PbS depressant. The inhibition effect of the Fe2+/NaClO system is attributed to the oxidation effect of •OH radicals from the reaction between HClO and Fe2+. The recovery of PbS is only 9.48 % and that of CuFeS2 is 82.33 % under the following conditions: pH 3.5, 4 min reaction time, 10:1 Fe2+:NaClO molar ratio and 1 × 10−2 mol/L NaClO concentration. Contact angle test results suggested that the hydrophobicity of PbS was decreased by conditioning with the Fe2+/NaClO system. X-ray photoelectron spectroscopy results showed that the S2− species on the PbS surface was oxidised into SO42−, and thus, PbSO4 occurred on the PbS surface. Furthermore, SO42− concentration reached 61.67 % of the total S species. Oxidative production coated the PbS surface well, depressing PbS flotation. However, the Fe2+/NaClO system barely changed the components of the CuFeS2 surface. The CuFeS2 surface still exhibits a high hydrophobic level. Therefore, PbS can be efficiently separated from CuFeS2 by using the Fe2+/NaClO system.

Abstract Image

利用 Fe2+/NaClO 系统中的羟基自由基作为抑制剂浮选分离方铅矿和黄铜矿
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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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