Separation of gold cyanide ion from anion-exchange resins

Law, Henry; Wilson, Wilson L.; Gabriel, Nathan

doi:10.1021/i200029a002

Cited by 8 publications

(6 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first condition studied was temperature. The optimum operating temperature for the original gold recovery process had been determined to be 45 °C (Law et al, 1985), and since elution rate generally increases with increasing temperture, there was no need to attempt regeneration at a lower temperature. Although the maximum operating temperature of the IRA-900C resin is quoted as being 60 °C for processes involving hydroxide (Rohm and Haas Co., 1981), running the column at this temperature for regeneration produced an unacceptable capacity loss and a physical texture change which was attributed to breakdown of the resin.…”

Section: Eluentmentioning

confidence: 99%

“…In an effort to find a simpler and more environmentally sound method for recovering gold from ion-exchange re- sins, Law (1982Law ( ,1983) and Law et al (1985) developed a process by which gold can be eluted from the resin and recovered directly as potassium gold cyanide (Law and Gabriel, 1986). The eluent, consisting of a concentrated KSCN solution in a mixed solvent of water and DMF, is fed to the gold-containing resin column.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Regeneration of ion-exchange resins used for gold recovery

Sapjeta¹,

Law²,

Caseboldt³

1987

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

Ion-exchange resins are currently used at gold-plating facilities to collect gold from waste solutions. The gold-containing feed solution is passed through an anion-exchange resin column where gold is adsorbed as Au(CN)2~. The present method of recovering the adsorbed gold is by drying and incineration of the resin. An alternative method involves eluting gold from the resin by use of a concentrated KSCN solution in a mixed solvent of water and DMF, followed by crystallization as potassium gold cyanide. A two-step process for regeneration of ion-exchange resins from which gold has been extracted has been developed. This process involves conversion from the initial thiocyanate form of the resin to the chloride form, followed by conversion to the hydroxide form. The operating temperature range has been determined to be 45-55 °C. Changes in flow rate and eluent concentration show little effect on the rate of thiocyanate elution.

show abstract

Section: Eluentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Regeneration of ion-exchange resins used for gold recovery

Sapjeta¹,

Law²,

Caseboldt³

1987

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Typically, Felix et al [2] and Lu et al [3] have suggested an electrochemical process to destroy cyanide and recover copper at the same time. Xie et al [4] and Law et al [5] employed the anion-exchange techniques as a selective recovery method of cyanide-metal complexes from cyanide waste streams. In addition, a copper cyanide recovery process using activated carbon has also been proposed [6,7].…”

Section: Introductionmentioning

confidence: 99%

Effect of different type of scavengers on the photocatalytic removal of copper and cyanide in the presence of TiO2@yeast hybrids

Zheng

Pan

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Effect of different type of organic or inorganic additions (formic acid, AgNO 3 , NaCl) on the photocatalytic reduction of copper and photooxidation of cyanide with illuminated TiO 2 @yeast was studied in this work together with the impact of solution pH values and contact time. The results indicated that pH values exhibited a great effect on the adsorption and photocatalytic performance of cyanide and copper because the surface charge of the TiO 2 @yeast and the existence form of cyanide and copper are highly pH dependent. The optimal adsorption and photo-oxidation of cyanide was observed at pH 2.0 while the best adsorptive and photocatalytic efficiency for copper was achieved at pH 5.0 within the studied range. The addition of formic acid increased the photo-reduction rate of copper and inhibited the photo-oxidation of cyanide. AgNO 3 , as electron acceptor, restrained the Cu(II) reduction from 75.0 to 30.5 %, whereas accelerate the photooxidation of cyanide. Besides, the presence of chloride ions retarded the removal efficiency of both cyanide and copper. The first-order kinetic model well described the experimental data. One possible mechanism of the effect of additives on copper and cyanide degradation was discussed.

show abstract

“…Nonaqueous solvents have been investigated for many years as a way of altering selectivities in both cation- and anion-exchange processes. − It has been demonstrated that mixtures of water and organic solvents are more effective than aqueous solutions for the separation of [Au(CN) 2 ] - from ion-exchange resin. , Dipolar polar aprotic solvents such as dimethylformamide, N -methyl-2-pyrrolidone, and acetone are particularly well suited for this purpose. Furthermore, the elution can be carried out with simple counterions such as Cl - and SCN - .…”

Section: Introductionmentioning

confidence: 99%

Ion-Exchange Equilibria for [Au(CN)₂]^-/Cl^-, [Au(CN)₂]^-/SCN^-, and SCN^-/Cl^- in Acetone + Water Mixtures at 303 K

et al. 2005

View full text Add to dashboard Cite

Ion-exchange equilibria are presented for [Au(CN) 2 ] -/Cl -, [Au(CN) 2 ] -/SCN -, and SCN -/Clin acetone + water mixtures at 303 K using Purolite A500 as the ion exchanger. The effect of the composition of acetone in the external solution on the ion-exchange isotherm for each binary system is considered. The experimental data are correlated using the law of mass action, modified with activity coefficients, to determine the equilibrium constant for each binary system. It is shown that the selectivity of Purolite A500 is highly dependent on the composition of the external solution. The selectivity of the resin for [Au(CN) 2 ] -, in particular, decreases markedly with an increase in the composition of acetone. The fitted values of the equilibrium constants are consistent with the trends observed in the corresponding ionexchange isotherms.

show abstract

Separation of gold cyanide ion from anion-exchange resins

Abstract: use in three-phase systems and on the development of a comprehensive model to predict mass transfer in vertical bubble flow.

Cited by 8 publications

References 2 publications

Regeneration of ion-exchange resins used for gold recovery

Regeneration of ion-exchange resins used for gold recovery

Effect of different type of scavengers on the photocatalytic removal of copper and cyanide in the presence of TiO2@yeast hybrids

Ion-Exchange Equilibria for [Au(CN)₂]^-/Cl^-, [Au(CN)₂]^-/SCN^-, and SCN^-/Cl^- in Acetone + Water Mixtures at 303 K

Contact Info

Product

Resources

About

Separation of gold cyanide ion from anion-exchange resins

Abstract: use in three-phase systems and on the development of a comprehensive model to predict mass transfer in vertical bubble flow.

Cited by 8 publications

References 2 publications

Regeneration of ion-exchange resins used for gold recovery

Regeneration of ion-exchange resins used for gold recovery

Effect of different type of scavengers on the photocatalytic removal of copper and cyanide in the presence of TiO2@yeast hybrids

Ion-Exchange Equilibria for [Au(CN)2]-/Cl-, [Au(CN)2]-/SCN-, and SCN-/Cl- in Acetone + Water Mixtures at 303 K

Contact Info

Product

Resources

About

Ion-Exchange Equilibria for [Au(CN)₂]^-/Cl^-, [Au(CN)₂]^-/SCN^-, and SCN^-/Cl^- in Acetone + Water Mixtures at 303 K