首页|Fe3O4对黄铜矿在酸性硫酸铁溶液中铜溶解氧化还原反应的影响

Fe3O4对黄铜矿在酸性硫酸铁溶液中铜溶解氧化还原反应的影响

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由于钝化层的形成,黄铜矿(CuFeS2)在氧化条件下浸出通常具有溶解速率缓慢的特点.为了将黄铜矿浸出过程中的钝化效应降至最低并提高铜的回收率,研究了 CuFeS2在不同pH值(1.0、1.5和1.8)和温度(25和50 ℃)条件下浸出时,向Fe2(SO4)3-H2SO4浸出剂中添加磁铁矿(Fe3O4)对铜溶解速率的影响.结果表明,溶液pH值、电位和温度在溶解过程中起着关键作用.在pH 1.8、50 ℃和400 mV的条件下,Fe3O4-CuFeS2混合体系中铜的回收率达到最大值(70％),而未添加Fe3O4时,CuFeS2中铜的回收率较低(48％).添加Fe3O4有助于维持较高的氧化还原值.添加Fe3O4还使活化能从79.04 kJ/mo l降低到53.69 kJ/mol.这表明,当Fe3O4存在时,由于形成了更易溶解的中间体斑铜矿(Cu5FeS4)和辉铜矿(Cu2S),CuFeS2更易被氧化.两种溶解过程都受到矿物表面的化学控制.此外,对浸出残渣的矿物学分析表明,当无Fe3O4存在时,作为表面钝化物的黄钾铁矾浓度较高.因此,添加Fe3O4减少了钝化层的形成,提升了铜的回收率.
Influence of Fe3O4 on redox changes during Cu dissolution from CuFeS2 in acidified ferric sulfate
Chalcopyrite(CuFeS2)leaching under oxidizing conditions is generally characterized by slow dissolution rates due to the formation of passivation layers.The aim of this study is to develop a method that will allow the minimization of the passivation effect on the leaching of chalcopyrite and enhance copper recovery.To achieve this goal,the effect of parameters such as magnetite(Fe3O4)addition to the lixiviant Fe2(SO4)3-H2SO4 during the leaching of CuFeS2 at various pH(1.0,1.5 and 1.8)and temperatures(25 and 50 ℃)on copper dissolution rate overtime,was investigated.The results revealed that the solution pH,potential and temperature played a vital role during the dissolution.The highest recovery rate(70％)of Cu was achieved at pH 1.8,50 ℃ and 400 mV from the mixed Fe3O4-CuFeS2,whereas the recovery rate of Cu from CuFeS2 in the absence of Fe3O4 was relatively low(48％).It was found that the addition of Fe3O4 allowed to maintain higher redox potential values.The addition of Fe3O4 also decreased the activation energy from 79.04 to 53.69 kJ/mol,suggesting that CuFeS2 is easily oxidized in the presence of Fe3O4 through the formation of more soluble intermediates(bornite(Cu5FeS4)and chalcocite(Cu2S)).Both dissolution processes were chemically controlled on the surface of the mineral.Furthermore,the mineralogical analysis of leaching residues showed that jarosite which is a candidate for surface passivation appeared in higher concentration in the absence of Fe3O4.Therefore,the addition of Fe3O4 reduced the formation of a passivation layer and enhanced the recovery rate of Cu.

chalcopyritedissolutionmagnetitegalvanic couplepassivation

Kolela J NYEMBWE、Elvis FOSSO-KANKEU、Frans WAANDERS、Martin MKANDAWIRE、Didier K NYEMBWE、Bhekie B MAMBA

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Water Pollution Monitoring and Remediation Initiatives Research Group,School of Chemical and Minerals Engineering,Faculty of Engineering,North-West University,Potchefstroom,South Africa

Department of Mining Engineering,College of Science Engineering and Technology,University of South Africa,Florida Science Campus,Johannesburg,South Africa

Department of Metallurgy,Faculty of Engineering and Built Environment,University of Johannesburg,Doornfontein,Johannesburg,South Africa

Department of Chemistry,School of Science and Technology,Cape Breton University,Canada

School of Mining,Metallurgy and Chemical Engineering,Faculty of Engineering and the Built Environment,University of Johannesburg,Johannesburg,South Africa

Institute for Nanotechnology and Water Sustainability,College of Science Engineering and Technology,University of South Africa,Florida Science Campus,Johannesburg,South Africa

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黄铜矿 溶解 磁铁矿 电偶 钝化

local South African Mining CompanyExtraction Metallurgy Laboratory at the University of JohannesburgNorth-West University(IREA Account)University of South Africa(CSET Special Research Fund)

2024

10.1016/S1003-6326(24)66519-2

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(6)
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