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destruction cyanide gold mill effluents

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destruction cyanide gold mill effluents

Destruction of cyanide in gold mill effluents: biological ...

Destruction of cyanide in gold mill effluents: biological versus chemical treatments Biotechnol Adv. 2003 Sep;21(6):501-11. doi: 10.1016/s0734-9750(03)00099-5. Author Ata Akcil 1 Affiliation 1 BIOMIN Group, Mineral Processing ...

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Cyanide Destruction Methods and Processes

Detoxification processes are used to reduce the concentrations of toxic constituents in tailings streams and process solutions, either by dilution, removal, or conversion to a less toxic chemical form (sometimes referred to as"destruction" or "degradation" in the case of toxic cyanide species). The objective is to produce an effluent that meets limits or guidelines that have been set ...

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DETOXIFICATION OF CYANIDE IN GOLD PROCESSING …

Key words: Cyanide destruction, hydrogen peroxide, copper sulfate, optimum pH, cyanide INTRODUCTION Cyanides are present in effluent waters of several industries especially in chemical and mineral processing industry. Mineral processing industries, especially gold processors, use a great deal of cyanide Ingles and Scott, 1993. Cyanide is used in

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CYANIDE DETOXIFICATION OF CYANIDATION TAILS AND …

1. Free cyanide and thiosulfate (Reaction 8) are preferentially oxidised prior to the oxidation of copper cyanide and thiocyanate which occur in parallel. 2. The control of pH is important since at low pH, HCN forms which is not readily oxidised and the rate of cyanate oxidation increases. 2 4 2-2 4 2-4H 2 5 S 2 3 HO →+ 5HSO (8) Hydrogen ...

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Biodegradation of cyanide via recombinant cyanide ...

Cyanide effluents in this bioreactor could be recirculated, until legal cyanide limits for disposal are met. In the present study only free cyanide degradation was determined. Experiments designed to determine the degradation of total cyanide (WAD or SAD cyanide) by E. coli-CynD are in progress. E. coli-CynD viability in gold mining cyanide ...

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hydrogen cyanide gold mining

Destruction of cyanide in gold mill effluents biological. Although cyanide can be destroyed and recovered by several processes it is still widely discussed and examined due to its potential toxicity and environmental impact Biological treatment of cyanide is a well-established process and has been commercially used at gold mining operations in North America...

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Hydrogen Peroxide Cyanide Destruction Plant

Up to now, the effluent treatment has usually been regarded as a costly appendage to the gold mill, whereas an integrated concept would often lead to considerable savings in operating costs. Hydrogen peroxide has been used widely in industry for cyanide detoxification, for example. The process has the advantage over techniques that use chlorine ...

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(PDF) Gradual cyanide treatment using AVR and ozone/UV ...

Gradual cyanide treatment using AVR and ozone/UV systems with various catalysts in silver mill effluents June 2005 Mineral Processing and Extractive Metallurgy IMM Transactions section C 114(2 ...

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ANDO, R. A. Interação de SO com espécies iônicas e ...

AKCIL, A. Destruction of cyanide in gold Mill effluents: biological versus chemical treatments. Biotechnology Advances, v. 21, 2003. ATSDR. Agency for toxic substances and disease registry. Toxicological profile for cyanide, 2006. BÄCKSTRÖN, H. L. J. The chain-reaction theory of negative catalyses. Journal of the American Chemical Society, 49 ...

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Cyanuration — Wikipédia

La cyanuration, ou procédé MacArthur-Forrest selon les noms des inventeurs, John Stewart MacArthur et les frères Robert et William Forrest, est une technique hydrométallurgique d'extraction de l'or grâce à une solution de cyanures alcalins [1], [2].Le procédé consiste en une lixiviation du minerai aurifère par une solution de cyanures très dilués.

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Cyanide and its biodegradation

Cyanide in effluent (gold mining) Mike Agbesi et al ... ( leading mining company in the development and implementation of biological treatment systems for cyanide destruction.) ... as an alternative to conventional methods. Destruction of cyanide by microorganisms in gold mill effluents is a natural process that can be readily exploited and ...

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Use of ozone in the treatment of cyanide containing effluents

Use of ozone in the treatment of cyanide containing effluents F. Nava*, A. Uribe, R. Pérez CINVESTAV-IPN, Carretera Saltillo-Monterrey km 13, Ramos Arizpe, Coahuila, 25900 México Received 20 September 2002; accepted 15 March 2003 ABSTRACT The treatment of effluents of the gold and silver cyanidation process is one of the main problems that

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Obtaining Urea from Effluents of Gold Cyanidation Process ...

Cyanide solutions from discharges were used without previous neutralization. The samples, each 20 l, of effluents were taken from gold ore processing plants located at Segovia and Puerto Berrio in Antioquia, Colombia. They were transported under refrigeration conditions at 4°C with a pH of 11.35 and 11.5, for a period not exceeding 20 days.

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US4966715A - Process for the removal of cyanide from ...

US4966715A US07/354,039 US35403989A US4966715A US 4966715 A US4966715 A US 4966715A US 35403989 A US35403989 A US 35403989A US 4966715 A US4966715 A US 4966715A Authority US United States Prior art keywords cyanide hydrogen peroxide phosphoric acid wastewater concentration Prior art date Legal status (The legal status is an assumption and is not a …

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Yonika Wiputri - Senior Metallurgist - Barrick Gold ...

Metallurgist. Barrick Gold Corporation. Jul 2013 - Present8 years 3 months. Hemlo, Ontario. • Developed site test program for pilot scale peroxide and air - SO2 cyanide destruction in conjunction with AuTec. • Worked closely with operations, instrumentation and environmental groups to ensure the smooth running of the cyanide destruction ...

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A critical review on destruction of thiocyanate in mining ...

However, thiocyanate reacts very slowly under the conditions used for cyanide destruction (Devuyst et al., 1982). Hydrogen peroxide was also reported to destroy cyanide in gold mill effluents but did not destroy thiocyanate (Akcil, 2003). Byerley and Enns (1984) documented an electrochemical process for regeneration of cyanide from thiocyanate ...

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US4622149A - Effluent treatment - Google Patents

A process in which ferric ion in water-soluble form is added to an effluent containing cyanide, arsenic and antimony and having a pH of about 5 to 9 and treating effluent with SO 2 and oxygen in the presence of soluble copper to produce a treated effluent having very low contents of …

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‪Ata Akcil‬ - ‪Google Scholar‬

Destruction of cyanide in gold mill effluents: biological versus chemical treatments. A Akcil. Biotechnology Advances 21 (6), 501-511, 2003. 329: 2003: Precious metal recovery from waste printed circuit boards using cyanide and non-cyanide lixiviants–a review.

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Kinetics of natural degradation of cyanide from gold mill ...

The oldest treatment method practiced by Canadian gold mines for cyanide destruction is "natural degradation". Based on the literature review of the previous studies, the most important mechanism in the natural degradation of cyanide was ... solutions, has been applied to actual gold mill effluents. Results show that the model can be used for ...

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Chemists Without Borders: Crowd Funded Low-Tech Cyanide ...

Cyanide – a toxin so potent that it gets its own chapter in The Poisoner's Handbook [2] – is by far the most common lixiviant (extraction agent) used in gold mining, accounting for about 90% of world production.[3] It's also used in the recovery of base metal such as …

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Casos de estudio y aplicaciones en ecología microbiana by ...

Factors affecting the biodegradation of cyanide by Burkholderia cepacia strain C-3. Journal of Bioscience and Bioengineering, 89(3), 274-277. ...

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Cyanide Degradation from Mining Effluent Using Two ...

[4] A. Akcil, "Destruction of cyanide in gold mill effluents: biological versus chemical treatments," Biotechnology Advances, vol. 21, pp. 501-511, 2003. [ Links ] [5] J. Azamat and A. Khataee, "Molecular dynamics simulations of removal of cyanide from aqueous solution using boron nitride nanotubes," Computational Materials Science, vol. 128 ...

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Figure 4 from A case study of CIP tails slurry treatment ...

In this paper two cyanide recovery/destruction technologies, namely the Cyanisorb process and the INCO SO2/Air process, are evaluated for the treatment of waste cyanide effluents from a gold mill of 12,000 tonnes of ore per day capacity. The comparison is made for CIP tails slurry of variable concentrations of free and weakly-complexed cyanide.

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Inhibitory effect of cyanide on wastewater nitrification ...

2004), with free cyanide in the form of HCN or CN − being more toxic to biological processes than thiocyanate and metal–cyanide complexes (Kim et al. 2011b). Cyanide concentrations in the range of 0·01–10 mg l −1 have been found in industrial wastewater effluents (Wild et al. 1994; Dash et al. 2009). In these industrial wastewaters ...

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Destruction of cyanide in gold mill effluents: Biological ...

Request PDF | Destruction of cyanide in gold mill effluents: Biological versus chemical treatments | In gold mining, cyanide has been the preferred lixiviant worldwide since 1887. Although cyanide ...

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Determination and detoxification of cyanide in gold mine ...

The cyanide species in the gold tailings are classified as free cyanide, weak acid dissociation, and metallocyanide complexes. Several methods, such as colorimetric, titrimetric, and electrochemical, have been developed to determine cyanide concentrations in gold mine effluents.

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Bacterial Utilization of Cyanide | Nature

Destruction of cyanide in gold mill effluents: biological versus chemical treatments Ata Akcil; Biotechnology Advances (2003) Novel cyanide-hydrolyzing …

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Photocatalytic advanced oxidation processes for ...

Cyanide (CN −) from gold processing effluents must be removed to protect human health and the environment.Reducing the use of chemical reagents is desirable for small centralized and decentralized facilities. In this work, we aimed to optimize the use of ultraviolet (UV) radiation coupled with hydrogen peroxide (H2O2) to enhance the rate and extent of CN − removal in synthetic and actual ...

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Destruction of cyanide in gold mill effluents: biological ...

Destruction of cyanide by microorganisms in gold mill effluents is a natural process that can be readily exploited and engineered to accommodate the large flows and elevated cyanide containing solutions generated at commercial precious metals operations (Akcil and Mudder, 2003).

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Degradation of cyanide from gold processing effluent by H ...

This work investigates the removal of cyanide as a noxious pollutant in the gold processing effluent (Aq-Dara mine, Takab, Iran) using H 2 O 2, H 2 O 2 +Fe(II) (Fenton), H 2 O 2 +Cu(II), NaClO and Ca(ClO) 2 oxidants. Implementation of purification operation was carried out by varying the parameters including pH, oxidant dosage, temperature and ...

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