Treatment of cyanide effluents by oxidation and adsorption in batch and column studies

Yazıcı, Ersin; Deveci, Hacı; Alp, İbrahi̇m

doi:10.1016/j.jhazmat.2008.12.050

Cited by 62 publications

(7 citation statements)

References 25 publications

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“…Cyanide adsorption by waste materials has been reported only rarely; for instance, Yazici et al [11] reported a low cyanide adsorption capacity of 0.401 mg/g onto rice husk. Therefore, testing the performance of other waste materials that Polanyi potential (J/mol) are available in high quantities to find a low-cost and efficient alternative adsorbent is necessary.…”

Section: Introductionmentioning

confidence: 99%

Removal of cyanide from wastewater by adsorption onto pistachio hull wastes: Parametric experiments, kinetics and equilibrium analysis

Moussavi

Khosravi

2010

Journal of Hazardous Materials

146

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Section: Introductionmentioning

confidence: 99%

Removal of cyanide from wastewater by adsorption onto pistachio hull wastes: Parametric experiments, kinetics and equilibrium analysis

Moussavi

Khosravi

2010

Journal of Hazardous Materials

146

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“…The acidifying effect of CO2 present in air also leads HCN volatilisation in tailings ponds [12]. [20] It is relevant to note that in a previous study [31] air oxidation of cyanide (100 mg/L CN -, initial pH 12.5) was studied in a similar system used in the current study. The authors noted that pH had a tendency to decrease apparently by the transfer of carbon dioxide in air into the solution.…”

Section: Resultsmentioning

confidence: 99%

Recovery of Cyanide From Effluents Using Carbon Dioxide

Yılmaz

Ahlatcı²,

Yazıcı³

et al. 2017

Mugla Journal of Science and Technology

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Cyanidation effluents are treated in order to reduce the cyanide level down to regularity limits. Cyanide recovery is the most desired route for treatment of effluents of high cyanide consuming ores, in particular, due to economic and environmental incentives. In this study, carbon dioxide (CO2) was utilised as an alternative for acidification of cyanide solutions prior to absorption/recovery of hydrogen cyanide (HCN(g)) in alkaline solutions. Kinetic tests indicated that reaction time was an important parameter for the recovery of cyanide, which reached 89.1% over a period of 90 min. Effects of concentration of cyanide (0.5-1.5 g/L NaCN), flow rate of carbon dioxide (0.38-1.15 L/min. CO2), and time (30-90 min.) on the recovery of cyanide (%) were investigated in detail by a two-level full factorial design (23). The statistical evaluation of the data showed that flow rate of carbon dioxide and time were statistically significant parameters. Efficiency of the process was not affected by the concentration of cyanide. The results demonstrated that high recoveries of cyanide up to 93.1% could be achieved under suitable conditions. Introduction of air (1.15 L/min.) as a carbon dioxide source was found to be inefficient and require longer reaction periods for high recoveries i.e. no recovery at 90 min. vs. 95.4% at 24 h. A separate test performed using a real pregnant leaching solution (PLS) yielded a cyanide recovery of 49.7%. These finding demonstrated that using carbon dioxide can be used for acidification of cyanide solutions for cyanide recovery.

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“…To prevent release of hydrocyanic acid (HCN), the pH of the cyanide solution was kept above 9.0 [20]. The pH of the solution was regulated using NaOH or HClO 4 .…”

Section: Methodsmentioning

confidence: 99%

Enhancing destruction of copper (I) cyanide and subsequent recovery of Cu(I) by a novel electrochemical system combining activated carbon fiber and stainless steel cathodes

Chen

Sun

et al. 2017

Chemical Engineering Journal

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A B S T R A C TMetal recovery is an attractive strategy for treatment of heavy metal wastewater. Heavy metal cyanide complexes are common pollutants in electroplating or mine industry wastewater, which usually hinder metal recovery due to the high stability of these complexes. A novel electrochemical system with activated carbon fiber and stainless steel combined cathodes was constructed for copper (I) cyanide (Cu(CN) 3 2− ) destruction and Cu(I) recovery. The destruction of cyanide was significantly improved by combining the stainless steel and activated carbon fiber cathodes due to the enhancement of electro-generated H 2 O 2 , which was promoted due to catalysis by copper deposited at the cathodes. Both the destruction of Cu(CN) 3 2− and recovery of Cu(I) at 75 min attained 95.0 ± 3.0%, which were higher than values obtained using stainless steel or activated carbon fiber as individual cathodes. The rate of Cu(CN) 3 2 destruction and Cu(I) recovery increased with increasing pH. The optimal current density was 50 A/m 2 , and higher current density caused more side reactions. Cu(CN) 3 2− was successively transformed into Cu(CN) 2 − , CNO − and Cu(I), and the liberated Cu(I) was recovered as Cu(0) on the stainless steel and activated carbon fiber electrodes.

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Treatment of cyanide effluents by oxidation and adsorption in batch and column studies

Cited by 62 publications

References 25 publications

Removal of cyanide from wastewater by adsorption onto pistachio hull wastes: Parametric experiments, kinetics and equilibrium analysis

Removal of cyanide from wastewater by adsorption onto pistachio hull wastes: Parametric experiments, kinetics and equilibrium analysis

Recovery of Cyanide From Effluents Using Carbon Dioxide

Enhancing destruction of copper (I) cyanide and subsequent recovery of Cu(I) by a novel electrochemical system combining activated carbon fiber and stainless steel cathodes

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