Cyanide tailings are the bulk solid waste generated by the production processes of gold mines. Since the highly toxicity of cyanide affects its disposal and comprehensive utilization, a decyanation treatment is needed. However, wide-ranging industrial uses of the current decyanation methods are rest …
1. Introduction. Cyanide (CN −) is a silent killer and is highly toxic to the environment and biological life (Kaszeta, 2020).Also known as isocyanides, cyanide ions, cyanide anions, or cyanide (1−) ions, cyanides are composed of a carbon atom triple bonded to a nitrogen atom (C N) (Adeola, 2011).Given its acute toxicity, cyanide is …
Both the use and disposal of cyanide present significant safety and environmental risks. Cyanide and cyanide gas are both extremely toxic and great care has to be taken during ore processing to avoid exposure for workers. Solutions containing cyanide have to be carefully managed to prevent the formation of cyanide gas.
thicken the tailings just to the extent that they can be pumped using robust centrifugal pumps by pipeline to a surface tailings facility, where the tailings are deposited sub-aerially (that is, above water and on the surface) forming a beach. The forms of tailings containment and method of construction and facility raising varies from region to
peroxide process for treating cyanide tailings solutions (10-14). The process has limited application for ... (APHA) Standard Method 4500 CN. Sulfite Detox Cyanide destruction was investigated for CIL tails generated from a cyanide leach (with a three hour pre-oxidation stage) of two ore samples (Samples A and B). A summary of the tails solution
When collected tailings samples were received in the laboratory with a supernatant solution, the aqueous phase was separated from the solid phase by settling and the supernatant was carefully removed, filtered (0.45 μm), and analyzed for total cyanide (CN T), CN WAD, cyanate (CNO −), and thiocyanate (SCN −).Solid tailings …
DOI: 10.1016/j.powtec.2022.117346 Corpus ID: 247878716; Basic research on the microwave absorbing properties and microwave roasting kinetic of cyanide tailings @article{Li2022BasicRO, title={Basic research on the microwave absorbing properties and microwave roasting kinetic of cyanide tailings}, author={Haoyu Li and Jun Wang and …
1. Introduction. Cyanide tailings are typically hazardous waste, containing large amounts of heavy metals and cyanide [13].Open piling of tailings caused many environmental problems such as land occupation, destruction of vegetation, land degradation and desertification, dust pollution, surface and groundwater pollution [22], [54].CT cannot be …
Total cyanide methods are allowed for screening. These methods determine free cyanide, weak acid dissociable metal cyanide complexes and strong metal cyanide complexes. Many laboratories find the total cyanide screening methods easier, faster and cheaper than some of the other operationally defined cyanide methods (e.g.,
The key points to consider when selecting a cyanide treatment process are the specific cyanide species present, the cyanide concentration, chemical compatibility, cost and …
Cyanide tailings are industrial hazardous solid wastes arising from gold mining industry. Hundreds of millions of tons of cyanide tailings that contain highly toxic cyanides and various valuable elements, such as gold, silver, iron, sulfur, copper, lead, and zinc are generated and discharged to tailing dams every year. ... Chloride leaching has ...
Application of physical, natural, biological, and chemical methods to detoxify cyanide to a permissible limit (50 mg L-1) can be achieved when the chemical compositions of cyanide (type of species) present in the tailings are known. The levels of cyanide concentration determine the impact it will have on the environment.
The cyanide tailings were mixed with water to make the slurry to a concentration of 35%, and then divided into multiple samples to decyanate by alkali …
The key points to consider when selecting a cyanide treatment process are the specific cyanide species present, the cyanide concentration, chemical compatibility, cost and regulatory compliance. These factors are discussed in depth in the subsequent case studies. A total of three sites are discussed, with a focus given to the following aspects:
The leaching tailings produced by cyanide method in gold industry are collectively referred to as cyanide tailings (CTs). Disposal of CTs is of great significance for resource recycling and mitigation of environmental pressure. ... The properties of cyanide tailings under the microwave heating process can be classified into two stages …
The current research status and the obstacles in the recovery of cyanide, gold-silver, sulfur-iron, copper-lead-zinc, and "low-value content" from cyanide tailings are then reviewed in detail. These processes can be used independently or in conjunction with other treatment methods depending on the nature of cyanide tailings.
METHOD 9016 FREE CYANIDE IN WATER, SOILS AND SOLID WASTES BY MICRODIFFUSION SW-846 is not intended to be an analytical training manual. Therefore, method ... In addition, SW-846 methods, with the exception of required method use for the analysis of method-defined parameters, are intended to be guidance methods …
Application of physical, natural, biological, and chemical methods to detoxify cyanide to a permissible limit (50 mg L −1) can be achieved when the chemical compositions of cyanide (type of species) present in the tailings are known. The levels of cyanide concentration determine the impact it will have on the environment.
The cyanide types typically found in gold mine tailings are free cyanide (HCN, CN − ), which is easily released, weak acid dissociable (WAD) cyanide (Cu, Ni, Zn) (these complexes are unstable ...
Abstract. Cyanide is among the most toxic chemicals widely employed in the cyanidation process to leach precious minerals, such as gold and silver, by the minerals processing …
Cyanidation tailings disposed of in a surface impoundment experience a loss of cyanide due to natural attenuation, which frequently reduces the cyanide concentration to very low levels. Quantifying cyanide losses in terms of impoundment geometry, local weather conditions and feed-solution chemistry has been largely empirical in spite of the …
DOI: 10.1016/J.JCLEPRO.2021.126946 Corpus ID: 233531608; The detoxification and utilization of cyanide tailings: A critical review @article{Dong2021TheDA, title={The detoxification and utilization of cyanide tailings: A critical review}, author={Kai-wei Dong and Feng Xie and Wen Wang and Yongfeng Chang and Dian-kun Lu and Xiaowei Gu …
18 October 2014 GENERAL BACKGROUND ON CYANIDE AND ITS USE IN PRECIOUS METALS MINING Cyanide is a general term for a group of chemicals containing carbon and nitrogen.
In the absence of appropriate alternative technologies (i.e. those with a lower environmental impact), a general ban on cyanide use ultimately lead to the closure of existing mines adhering to regulations and standards. Countries such as the as Czech Republic and Hungary, however, have already banned the use of cyanide in gold ore …
In addition, SW-846 methods, with the exception of required method use for the analysis of method defined parameters, are intended to be guidance methods which contain general ... 9012 and 9014) as well as analyzed for metal cyanide complexes (e.g., Method 9015). 1.2 Prior to employing this method, analysts should consult the disclaimer
Cyanide Use in Gold Mining Today's hardrock mining industry too often spills cyanide, endangering the environment, wildlife and humans. ... A tailings dam ruptured, spilling 3.5 million cubic feet of cyanide-contaminated waste into the Tisza and Danube Rivers, killing fish and poisoning water supplies as far as 250 miles downriver in Hungary ...
The resource utilization of cyanide tailings has significant environmental and economic benefits. The efficient recovery of gold from low-grade cyanide tailings containing 1.71 g/t Au was performed by a chlorination roasting–flotation process. The effects of roasting temperature, calcium chloride, internal coke, external coke, copper …
This present article reviews the determination and detoxification of cyanide found in gold mine tailings. Most of the cyanide remains in the solution or the slurries …
little as one fifth the cost of cyanide. It will generally still be important either to recycle the thiosulphate tailings solution back to the leach plant to minimize thiosulphate losses and new thiosulphate make up requirements, or use the tailings solution productively as a fertilizer. The gold thiosulphate complex is very
Gold is a highly required material for a wide range of personal and industrial applications. The high demand for gold, together with the shortage of natural resources and high pollution potential of wastes generated during mining and ore processing activities led to search for alternative sources of gold. A possible source is represented by mine …
A highly toxic chemical that can be dangerous to humans and wildlife, cyanide use at gold mining operations provokes concern in many jurisdictions. In fact, it was in response to a damaging spill from a tailings pond in Romania in 2000 that released 100,000 cubic metres of cyanide contaminated water into the Somes River, that the …
Selection of decyanation methods. Primarily, the cyanide tailings were decyanated by alkali-chlorine method, hydrogen peroxide oxidation method and INCO method. Results showed that (Fig. 1a) the content of CN t in the tailings slurry filtrate gradually decreased with the increase of the dosage, then decreased little or remained …
In this paper, the sources and characteristics of cyanide tailings are introduced. The technologies using various physical, chemical, and biological methods …