Removal of cyanide in aqueous solution by oxidation with hydrogen peroxide in presence of activated carbon prepared from olive stones

Yeddou, Ahmed Réda; Nadjemi, B.; Halet, Farid; Ould-Dris, Aïssa; Capart, R.

doi:10.1016/j.mineng.2009.09.009

Cited by 61 publications

(29 citation statements)

References 28 publications

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“…[24] The S BET and pore volume of AC-OS are 680 m 2 g ] 0 has the same effect as in absence of the AC. AC-OS reduces the time required for cyanide removal, and with molar ratios of 10 and 20, the total cyanide removal is reached in 6 and 3.5 h, respectively.…”

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confidence: 85%

Heterogeneous Fenton Catalysts Based on Activated Carbon and Related Materials

et al. 2011

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The Fenton reaction is widely used for remediation of waste water and for the degradation of organic pollutants in water. Currently, there is considerable interest to convert the classical Fenton reaction, which consumes stoichiometric amounts of iron(II) salts, into a catalytic process that is promoted by a solid. This review describes the work that has used carbonaceous materials either directly as catalysts or, more frequently, as a large-area support for catalytically activated transition metals or metal-oxide nanoparticles. The interest in this type of catalyst derives from the wide use of carbon in conventional water treatments and the wide applicability of the Fenton reaction. After two general sections that illustrate the scope and background of Fenton chemistry, the review describes the activity of activated carbon in the absence or presence of metal-containing particles. The last sections of the review focus on different types of carbonaceous materials, such as carbon nanotubes and diamond nanoparticles. The review concludes with a section that anticipates future developments in this area, which are aimed at overcoming the current limitations of low activity and occurrence of metal leaching.

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confidence: 85%

Heterogeneous Fenton Catalysts Based on Activated Carbon and Related Materials

et al. 2011

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“…This is due to the fact that it undergoes natural oxidation converting the cyanide to CO2 and N2. Based on this process, there are currently a number of commercially available processes, both chemical and biological, to treat cyanide solution effluents and decontaminate concentrates from cyanide leaching operations (Gupta and Mukherjee, 1990;Yeddou et al, 2010;Akcil, 2002;Akcil, 2003;Barriga-Ordonez et al, 2006;Kitis et al, 2005;Parga et al, 2003;Fatma et al, 2009;Dash et al, 2009;Patil and Paknikar, 2000;Ozel et al, 2010). Aside from this, waste effluents can be treated using physical methods such as carbon sorption and the use of membrane technology (Deveci, 2006;Lien, 2008;Gonen et al, 2004).…”

Section: Cyanidationmentioning

confidence: 99%

A conceptual flowsheet for heap leaching of platinum group metals (PGMs) from a low-grade ore concentrate

Mwase

Petersen

Eksteen³

2012

Hydrometallurgy

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This research proposes a new conceptual process to economically extract platinum group metals (PGMs), and as a secondary aim, base metals (BMs) from a low-grade concentrate originating from typical PGM concentrator plants. Slurry made from the concentrate was coated onto granite pebbles and packed into a column, in which it was bioleached with a mixed culture of thermophiles and mesophiles at 65°C. After 30 days the extractions achieved were 52 % copper, 95 % nickel and 85 % cobalt. The residual concentrate material was subsequently subjected to a cyanide leach also in a packed column operating at a room temperature of 23°C. After 21 days 20.3 % Pt, 87 % Pd and 46 % Rh were extracted. Using these results and projected extractions over longer operating times, a conceptual flowsheet was proposed for a possible process route to recover PGM values circumventing the problematic smelter route for this material.

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“…They are considered among the most dangerous compounds for the environment and their toxicity is mainly due to their aptitude to release free cyanides. Different processes are proposed and used for the removal of cyanides in solutions and slurries [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…The activated carbons, which are known as an excellent adsorbents, are widely used as catalysts and supports of catalysts [10,12,[17][18][19], in the mining industry for precious metal recovery and in polishing processes to remove low level cyanide concentration. For cyanide treatment, activated carbon and activated carbon impregnated with some transition metals have showed their effectiveness as an adsorbent and catalyst for the heterogeneous oxidation of cyanides and other pollutants.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of gaseous HCN in the presence of Ni-containing catalysts

Osińska

2013

Reac Kinet Mech Cat

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This work is devoted to the decomposition of gaseous HCN by oxidation with air catalyzed by different nickel containing catalysts. The presence of metallic nickel does not cause the decomposition of cyanide at 400°C, but NiO, electrochemical prepared nickel oxides Ni 2 O 3 ÁxH 2 O and (b,c)-NiOOH exhibit distinctly high catalytic activity at this temperature. The effect of HCN decomposition for electrochemically prepared nickel oxides was over 90 %. Nickel deposited on activated carbon also demonstrated catalytic behavior during the destruction of HCN with an air mixture at the temperature 400°C. Nickel oxide mixed with activated carbon showed a small increase of catalytic activity in the destruction of HCN in comparison with NiO.

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Removal of cyanide in aqueous solution by oxidation with hydrogen peroxide in presence of activated carbon prepared from olive stones

Cited by 61 publications

References 28 publications

Heterogeneous Fenton Catalysts Based on Activated Carbon and Related Materials

Heterogeneous Fenton Catalysts Based on Activated Carbon and Related Materials

A conceptual flowsheet for heap leaching of platinum group metals (PGMs) from a low-grade ore concentrate

Decomposition of gaseous HCN in the presence of Ni-containing catalysts

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