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materials by cyanidation [3-6]. Biooxidation of refractory gold-bearing arsenopyrite/ pyrite concentrates as a pretreatment step prior to cyanidation has already been proved to be an economically viable... methods, mainly by cyanidation [11-14]. Cyanide consumers include iron, copper, zinc, cobalt and nickel ions, etc. [5]. It has also been reasoned that cyanide consumption was related to the formation......
adsorption. Key words: chalcopyrite; galena; cyanide absorption; flotation; butyl xanthate 1 Introduction Gold cyanidation tailings are often associated with valuable minerals such as pyrite, chalcopyrite, galena, and sphalerite. The resource wastes and environmental pollution problems caused by the long-term accumulated gold cyanidation tailings, make the effective recycling of valuable minerals......
and/or the diffusion control are the practically faced problems. During cyanidation process and under certain conditions, gold surface is protected by a surface film, which causes poor gold extractions. There are several electrochemical measurement techniques to evaluate the anodic behavior of gold. Passivation phenomenon of gold surface can be considered as one of the challenges in practical cyanidation......
-containing cyanide solutions [J]. Journal of Central South University, 2020, 27(5): 1495-1502. DOI: https://doi.org/10.1007/s11771-020-4385-z. 1 Introduction The cyanidation has been applied in industry since 1887. It was widely applied because of its simple process, high recovery rate and strong applicability. However, the slow dissolution rate of gold is still one of the main problems of cyanidation......
to overcome the refractoriness and render the gold accessible to the lixiviant action of cyanide and oxygen [4]. Roasting, pressure oxidation, biooxidation, ultrafine grinding and modified cyanidation... concentrates to produce porous calcine with the increased amenability to cyanidation[9-10]. Pressure oxidation and biooxidation methods have gained importance in recent years mainly due......
. In this regard, flotation [9,10], alternative lixiviant systems such as thiosulphate or ammoniacal cyanide [11,12], leaching of copper prior to cyanidation [2,6,8], cyanide recovery from effluents (e.g. SART process) [5], preaeration prior to cyanidation [6,13,14], and addition of lead nitrate [14,15] have been tested for the treatment of copper-rich gold ores. Table 1 Solubility of copper minerals in 0.1......
recovery. All of the cyanidation tests were conducted in 100 mL flask at a working volume of 40 mL with 30% (w/v) solids in an orbital incubator shaker at 25 °C and the rotation rate of 180 r/min for 48 h. The pH of the cyanidation pulp was maintained at 10.5-11.0 (adjusted using 10 mol/L NaOH). The cyanide concentration was maintained in the range of 1.0-3.0 g/L as determined by titration. 2.6......
%) of gold and silver in cyanide leaching even after grinding the ore down to -75 mm. These ores need a suitable pretreatment to achieve high gold and silver extractions rates during cyanidation [1... to the conservation of natural resources. In this study, the ultra fine grinding of the plant tailings of a refractory silver ore was studied to recover the contained silver in subsequent cyanidation......
; guanidine 1 Introduction The cyanidation process has been successfully practiced in gold mining industry for more than 100 years[1]. Environmental constraints controlling the discharge of cyanide... is also a matter of concern to the cyanidation process since most copper minerals are easily and readily soluble in the cyanide solution used in gold leaching, which usually results in high cyanide......