Copper electrowinning from gold plant waste streams

Lemos, F.A.; Sobral, Luis Gonzaga Santos; Dutra, Achilles Junqueira Bourdot

doi:10.1016/j.mineng.2005.10.019

Cited by 27 publications

(24 citation statements)

References 15 publications

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“…The complexation of Cu in a cyanide system is known to have a high stability constant ͑␤͒ and high equilibrium constant ͑K͒, indicating preferential highorder complexation in the electrolyte 19,21,22 Cu…”

Section: Resultsmentioning

confidence: 99%

Acceleration Effect of CuCN in Ag Electroplating for Ultralarge-Scale Interconnects

Cho

Lee

Kim

et al. 2007

Electrochem. Solid-State Lett.

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The addition of CuCN accelerated the deposition rate in cyanide-based Ag electroplating. The catalytic effect came from the high-order complexation of Cu with the free CN − ions in electrolyte. It changed the equilibrium state of the electrolyte, presented as an increase in the amount of Ag͑CN͒ 2 − compared to Ag͑CN͒ 3 2− . Because Ag͑CN͒ 2 − could be reduced more easily, Ag electroplating was accelerated. Fourier transform infrared analysis showed the equilibrium change with the increase in Ag͑CN͒ 2 − peak according to the CuCN addition. For superfilling, it is necessary to localize the complexation on the Cu surface.

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Section: Resultsmentioning

confidence: 99%

Acceleration Effect of CuCN in Ag Electroplating for Ultralarge-Scale Interconnects

Cho

Lee

Kim

et al. 2007

Electrochem. Solid-State Lett.

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“…Energias livres e potenciais de eletrodo padrão para as reações possíveis envolvendo a redução de cobre em meio cianídrico [13]. 16 .…”

Section: Tabelaunclassified

“…A Reação 1 representa a redução de cobre a partir de seu complexo, a reação 2 mostra a oxidação de cianeto livre formando um composto gasoso intermediário conhecido como cianogênio [12,13] …”

Section: Introductionunclassified

Eletrorrecuperação de cobre e oxidação de cianeto de efluentes cianídricos diluídos gerados por unidade de galvanoplastia

Pombo

Dutra

2008

Matéria (Rio J.)

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RESUMOApesar de sua elevada toxicidade, eletrólitos cianídricos são amplamente empregados pelas indústrias de eletrorrecobrimento devido à qualidade dos depósitos metálicos obtidos. Na Casa da Moeda do Brasil, o processo de eletrodeposição de cobre sobre aço carbono é utilizado para a fabricação das moedas de um e cinco centavos, gerando, ao seu final, dois tipos de efluentes: um concentrado, após a sangria de eletrólitos contaminados; e outro diluído, após a lavagem dos discos eletrorrevestidos de cobre. Em um trabalho anterior, avaliou-se a possibilidade de se recuperar eletroliticamente o cobre e oxidar parte do cianeto existente nos efluentes concentrados, alcançando-se bons resultados para os teores finais de cobre e cianeto livre partindo-se de uma solução contendo 26g/L de cobre e 27g/L de cianeto total. O presente trabalho visou testar em escala de bancada uma célula eletrolítica para o tratamento dos efluentes diluídos, partindo-se de uma solução sintética contendo 200mg/L de cobre e 130mg/L de cianeto livre. Nas condições de vazão de 0,37mL/s e a 50°C, alcançou-se concentrações finais de 0,7mg/L de cobre e 0,08mg/L de cianeto livre para uma corrente elétrica de 1,5A, e menor que 0,5mg/L de cobre e 0,08mg/L de cianeto livre para uma corrente elétrica de 2A, após três horas de eletrólise.Palavras-chaves: cobre, cianeto, eletrorrecuperação, efluente.Copper electrowinning and cyanide oxidation from diluted cyanide wastewaters generated by an electroplating plant ABSTRACTDespite their high toxicity, cyanide electrolytes are widely used by metal finishing industries due to the quality of metallic deposits obtained. At the Brazilian Mint, the process of copper electroplating onto carbon steel is used to make coins of one and five cents, generating, at the end, two types of wastewaters: one concentrated, after bleeding the contaminated electrolytes; and another diluted, after washing the disks electroplated with copper. In a previous work the possibility of electrolytically recovering copper and oxidizing part of the existing cyanide in the concentrated effluents was evaluated, reaching good results for the final concentration of copper and free cyanide starting with a solution containing 26g/L of copper and 27g/L of total cyanide. The present work aimed at testing in a bench scale an electrolytic cell for the treatment of diluted effluents, starting from a synthetic solution containing 200 mg/L of copper and 130 mg/L of free cyanide. Under flow conditions of 0.37mL/s at 50°C, the final concentrations of 0.7mg/L for copper and 0.08mg/L for free cyanide were obtained for an electric current of 1.5A, and less than 0.5mg/L for copper and 0.08mg/L for free cyanide were obtained for an electric current of 2A, after three hours of electrolysis.

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“…15 It leads to high purity metals in contrast with pyrometallurgy, and can be conducted at room temperature, encompassing a rational engineering design which allows the recovery of most of the chemical reagents and solvents. [16][17][18][19][20][21][22][23][24][25] However, hydrometallurgy cannot be performed without using huge amounts of organic solvents and intensive chemical processing in the complexation and extraction steps, as well as in the metal release with acid treatment, also employed for recycling of the complexing agents.…”

Section: Introductionmentioning

confidence: 99%

Green Processing of Strategic Elements Based on Magnetic Nanohydrometallurgy

Condomitti¹,

Almeida²,

Silveira³

et al. 2018

J. Braz. Chem. Soc.

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Magnetic nanohydrometallurgy (NHM) is a new process based on engineered superparamagnetic nanoparticles capable of performing as complexing agents for extracting and recovering strategic metals from mineral sources and urban wastes, as well as for removing hazardous elements from contaminated water. Its principles and application are reviewed in this paper. Typical examples involving copper, silver and mercury processing are here discussed, including the exploitation of a novel nanotechnological strategy for capturing and fractionating rare earth elements.

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Copper electrowinning from gold plant waste streams

Cited by 27 publications

References 15 publications

Acceleration Effect of CuCN in Ag Electroplating for Ultralarge-Scale Interconnects

Acceleration Effect of CuCN in Ag Electroplating for Ultralarge-Scale Interconnects

Eletrorrecuperação de cobre e oxidação de cianeto de efluentes cianídricos diluídos gerados por unidade de galvanoplastia

Green Processing of Strategic Elements Based on Magnetic Nanohydrometallurgy

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