Evaluation of cyanide removal processes on water effluents from gold ore processing and industrial scale up

• Autorzy: Freitas Juliana , Bellido Jorge

Identyfikatory

DOI

10.46873/2300-3960.1461

• Języki publikacji: EN

Abstrakty

EN

Gold extraction goes through different steps, from research to physical-chemical processing, which uses chemical reagents for extraction, such as cyanide. In literature, there are presented many ways to remove cyanide from this effluent on a bench scale, although on an industry scale it is not very often analysed. In this study, seeking innovation on an industrial scale for cyanide removal from real effluent generated by gold processing was analysed through oxidation with H2O2 and Fenton process. It was proven that these processes can remove cyanide at the levels required for recirculation of the effluent in the process, which is 1.0 mg/L of free cyanide, reaching 99% of removal. Applying the treatment on an industrial scale, it was possible to obtain the removal of 89% of free cyanide and 90% of total cyanide. A statistical study was carried out using a DOE tool to evaluate the dosages of H2O2 and FeCl2 at different pH values to reduce the operational costs of this decontamination process. The results indicated that it is possible to remove cyanide to reuse the effluent, with results higher than 96% of removal, using 88% less H2O2 and 70% less FeCl2, monitoring pH at 3, resulting in less waste operation for the treatment of the effluent.

Słowa kluczowe

EN

gold ore; cyanide; oxidation; effluent treatment; fenton process; industry

PL

rudy złota; cyjanek; utlenianie; oczyszczanie ścieków; proces Fentona; przemysł

• Wydawca: Elsevier ; Główny Instytut Górnictwa
• Czasopismo: Journal of Sustainable Mining
• Rocznik: 2025
• Tom: Vol. 24, iss. 3
• Strony: 369--376
• Opis fizyczny: Bibliogr. 16 poz.

Twórcy

autor

Freitas Juliana

• Universidade Federal de Sao Joao Del-Rei, Departamento de Engenharia Química, Brazil

• https://orcid.org/0000-0002-1666-7403

autor

Bellido Jorge

• Universidade Federal de Sao Joao Del-Rei, Departamento de Engenharia Química, Brazil

• https://orcid.org/0000-0003-0186-5586

Bibliografia

• [1] Lyu X, Anning C, Wang J, Chen P, Batmunkh I. Determination and detoxification of cyanide in gold mine tailings: a review. Waste Manag. Res. 2019;11(37):1117e26. https:// doi.org/10.1177/0734242X19876691.
• [2] Branda PK. Caracterizaç~ao de rejeito da mineraçao de ouro por meio do uso de extraçoes sequenciais. Proceedings of the XXVI Jornada de Iniciaçao Científica e II Jornada de Iniciaç~ao em Desenvolvimento Tecnológico e Inovaçao: 26 anos incentivando novos talentos para o setor mineral. CETEM/ MCTIC. Rio de Janeiro, BR; 2018.
• [3] Pereira AC, Gomes MRS, Manfridini APA. Exploratory tests for leaching gold associated with limonitic ore. Brazilian Applied Science Review 2019;2:3. https://doi.org/10.34115/ basr.v3i2.998.
• [4] Chaguezac DFC. Estudo de Degradaçao do Complexo Cia- nometólico Ferricianeto [Fe(CN)3-] dos Efluentes da Miner- açao Aurífera por Meio de Fotocatalise com TiO2. Porto Alegre, BR: Master Thesis. Universidade Federal do Rio Grande do Sul; 2018.
• [5] Jimenez-Prieto YJ, Esperanza-Perez G, Ramírez-Gonzalez S, Alomas-Vicente I. Assessment of technological alternatives for cyanide waste waters management in gold ores pro¬cessing plant. Cuban J Chem 2020;2(32):218e31.
• [6] Gokelma M, Birich A, Stopic S, Friedrich B. A review on alternative gold recovery re-agents to cyanide. J Mater Sci Che. Eng 2016;4(8e17). https://doi.org/10.4236/msce.2016. 48002.
• [7] Vuono DC, Vanneste J, Figueroa LA, Hammer V, Aguilar- Huaylla FN, Malone A, Smith NM, Garcia-Chevesich PA, Bolanos-Sosa HG, Alejo-Zapata F, Polanco-Cornejo HG, Bellona C. Photocatalytic advanced oxidation processes for neutralizing free cyanide in gold processing effluents in Arequipa, southern Peru. Sustainability 2021;17(13). https://doi.org/10.3390/su13179873. 1e15.
• [8] Tang J, Shi X, Sun C, Zhuang H, Ning K, Zhang C. Comparison treatment of cyanide by chemical precipitation, fenton and fluidized-bed fenton process with suspended carrier coated iron oxide: parameter optimization and mechanism. Desalination Water Treat 2019;158:245e55. https://doi.org/10.5004/dwt.2019.24182.
• [9] Dutta D, Arya S, Kumar S. Industrial wastewater treatment: current trends, bottlenecks, and best practices. Chemospehere 2021;285:131245. https://doi.org/10.1016/j.chemosphere.2021.131245.
• [10] APHA - American Public Health Association. Standard methods for examination of water and wastewater. Washington DC. 2023.
• [11] Vicente CM. Ensaios Exploratorios de Lixiviado de Minerios de Ouro. Porto, PT: Master Thesis. Universidade do Porto; 2014.
• [12] Teixeira LAC, Arellano MTC, Marquez-Sarmiento CO, Yokoyama L, Araujo FVF. Tratamento de efluentes contendo cianeto por oxigenio singlete gerado atraves da rea?~o de peróxido de hidrogenio e hipoclorito de sodio. In: Proceedings of XXV Encontro Nacional de Tratamento de Minerios e Metalurgia Extrativa & VIII Meeting of the Southern Hemisphere on Mineral Technology. Goiania BR; 2013.
• [13] Budaev SL, Batoeva AA, Tsybikova BA. Effect of Fenton-like reactions on the degradation of thiocyanate in water treatment. J Environ Chem Eng 2014;2:1907e11.https://doi.org/10.1016/j.jece.2014.08.010.
• [14] Jafari AJ, Golbaz S, Kalantari RR. The study of fenton performance in removal of cyanide from aqueous solution. Iran J Health Environ 2013;4(5):423e32.
• [15] Adams MD. A methodology for determining the deportment of cyanide losses in gold plants. Miner Eng 2001;4(14): 383e90. https://doi.org/10.1016/S0892-6875(01)00018-8.
• [16] Montgomery DC, Runger GC. Estatística Aplicada e Proba- bilidade para Engenheiros. Ed. 5. LTC. Rio de Janeiro, BR; 2012.