The mechanism of elution of gold cyanide from activated carbon

Deventer, J.S.J. van; Merwe, P. F. Van Der

doi:10.1007/bf02662765

Cited by 9 publications

(3 citation statements)

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“…Removal of Au was significantly lower, reaching ~32% at 95°C and being nonexistent at 60°C. When adsorption is exothermic, higher temperature will aid in desorption (Van Deventer & Van Der Merwe, 1994). This higher temperature, while increasing regeneration efficiency, leads to a significant increase in operating costs.…”

Section: Resultsmentioning

confidence: 99%

“…When eluting Pt and Pd from activated carbon using NaCl solution, Snyders et al (2015) found a high desorption of 99%, but this required a temperature of 95 C. At 60 C, efficiencies were markedly lower at 64% and 68%, respectively. Removal of Au was significantly lower, reaching $32% at 95 C and being nonexistent at 60 C. When adsorption is exothermic, higher temperature will aid in desorption (Van Deventer & Van Der Merwe, 1994). This higher temperature, while increasing regeneration efficiency, leads to a significant increase in operating costs.…”

Section: Comparison Of Regenerationmentioning

confidence: 99%

“…Another use of solvents is that of elution, which takes place through ion exchange, where metals can be replaced on an adsorbent by using another metal with a higher ionic affinity or concentration. The process is commonly used in gold recovery (Van Deventer & Van Der Merwe, 1994) and has been proven to work on other metals such as platinum and palladium (Snyders et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Regeneration of As(V)‐loaded granular activated carbon through electrocoagulation

Moed,

Ku,

Hsu

2024

Water Environment Research

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As(V)‐loaded granular activated carbon was regenerated through electrocoagulation assisted by elution with NaCl. Adsorption of As(V) by activated carbon was highest at pH 6, and subsequent desorption in water was highest at pH 11, followed by pH 3. Lower initial pH improved arsenic removal during electrocoagulation, NaCl concentration was insignificant, but removal increased with current density. Adding Fe(II) before electrocoagulation led to an improved removal efficiency up to a concentration of 30 mg/L. Regeneration of As(V)‐loaded activated carbon increased with current density and time up to a maximum of 85%. An increase in NaCl concentration to 6000 mg/L further improved regeneration to 92%. Regeneration at a lower current density only dropped slightly from 54% to 51% when doubling activated carbon concentration, demonstrating excellent scalability. Repeated adsorption–desorption tests were performed, where 81% and 69% regeneration were obtained after four regenerations with NaCl concentrations of 6000 and 750 mg/L, respectively. NaCl concentration in the tested range did not influence electrocoagulation but improved regeneration through elution. The combination of electrocoagulation and elution facilitated a higher regeneration efficiency, meanwhile removing As(V) from the solution through adsorption on iron hydroxide.Practitioner Points As(V)‐loaded activated carbon was regenerated by electrocoagulation with elution. Regeneration increased with regeneration time and current density up to 85%. Addition of 6000 mg/L NaCl further increased regeneration to 93%. Regeneration of 82% was achieved after four regenerations. NaCl did not affect electrocoagulation but improved regeneration through elution.

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Section: Resultsmentioning

confidence: 99%

Section: Comparison Of Regenerationmentioning

confidence: 99%