Transformations of [Au(CN)2]− at the contact with activated carbon surface

Ibragimova, R. I.; Kubyshkin, S. A.; Fateev, Alexander; Krivov, A. S.; Fedyukevich, V. A.; Shcherbakov, Yu. S.; Mil’man, B. M.; Vorob'ev-Desyatovskii, N. V.

doi:10.1134/s1070363213120050

Russ J Gen Chem

2013

DOI: 10.1134/s1070363213120050

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Transformations of [Au(CN)2]− at the contact with activated carbon surface

R. I. Ibragimova¹,

S. A. Kubyshkin²,

Alexander Fateev³

et al.

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2015

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“…In MINIX anion exchangers, the dicyanoaurate(I) anion is sorbed due to the ion exchange with OHanions neutralizing the positive charge of quaternized tributylammonium cations fi xed on the polymeric matrix of the resin. In contrast to MINIX anion exchanger, activated carbons bind [Au(CN) 2 ]anions simultaneously in several independent ways [11,12]. Depending on the sorption conditions, [Au(CN) 2 ]anions may change in the course of sorption the method of binding with the matrix of activated carbon.…”

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confidence: 99%

Use of ion-exchange resins to deal with the effect of preg-robbing of gold in the course of cyanide leaching

Fedyukevich¹,

Kubyshkin²,

Блохин

et al. 2015

Russ J Appl Chem

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Possibility of using strongly basic anion exchange resin of MINIX brand and weakly basic anion exchange resin Purogold S992 brand in the high-temperature-caustic conditioning (HiTeCC) technological process for diminishing the loss of gold via adsorption on natural organic carbon-containing substances (pregrobbing phenomenon) in the course of cyanide leaching was studied. It was shown that the strongly basic anion exchanger MINIX has a higher affi nity for the anion [Au(CN) 2 ] -, compared with the microporous activated carbon WSC-207C-GR. As a result, the adsorbed dicyanoaurate(I) anion is transferred from the activated carbon to the ion-exchange resin. Reasons for binding of the dicyanoaurate(I) anion with active centers of activated carbons are considered, based on the fact that the adsorbent contains carbene-like carbon atoms. The existence of paramagnetic centers belonging to carbon atoms in the activated carbon was demonstrated by the EPR method. The suggested concept was used to diminish the loss of gold via partial oxidation of metallic gold in autoclave processing of pyrite-and arsenopyrite-containing concentrates.

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mentioning

confidence: 99%

Use of ion-exchange resins to deal with the effect of preg-robbing of gold in the course of cyanide leaching

Fedyukevich¹,

Kubyshkin²,

Блохин

et al. 2015

Russ J Appl Chem

Self Cite

View full text Add to dashboard Cite

show abstract

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Transformations of [Au(CN)2]− at the contact with activated carbon surface

Cited by 1 publication

References 17 publications

Use of ion-exchange resins to deal with the effect of preg-robbing of gold in the course of cyanide leaching

Use of ion-exchange resins to deal with the effect of preg-robbing of gold in the course of cyanide leaching

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