Autoclaves are a preferred component of the process for many largescale sulfidic refractory bodies, including such processes as AuAg pressure oxidation; CuAgAu pressure oxidation; NiCo pressure leach; NiCoCu concentrate pressure oxidative leach; and TiO2 HCL pressure leach.
conditions of gold leaching by means of thiourea method from the abovementioned ores and concentrates with 8590% gold extraction were established. Investigations were carried out on electrochemical leaching of refractory goldcontaining sulfide ores and concentrates. We used the acid chloride electrolyte, which contained thiourea as a ...
Mining Refractory Gold. Physical encapsulation of disseminated gold particles (usually less than a few micrometers in size) within a mineral that is unreactive and impervious to leaching Chemical interference by one or more of the ore constituents in the cyanide leaching process.
The Refractory Gold Containing Sulfide Ores are characterized by complex structure, by extremely thin impregnation of gold in sulfide ores (so called fineparticle gold with particle size from 1 to 5 micrometer), and by presence of components, which decrease the extraction of gold under cyanidation.
increase gold particle exposure, preliminary treatment of the concentrates is necessary [5,6]. Oxidation roasting and aqueous pressure oxidation are two processes that have found widespread industrial application for the treatment of refractory sulphide gold ores [3,7]. Bacterial oxidation is .
The cause of low gold recoveries can be either through the presence of naturally occurring 'preg robbing' carbonaceous materials or gold physically 'locked' in sulphide minerals. The majority of gold ores are classified refractory because the gold mineralogy is contained in sulphides.
pretreatment of refractory sulphide gold ores and concentrates. Application of the BIOX Process to the Pretreatment of Refractory. ... Application of Diagnostic Leaching Technique for Refractory Gold Ores. ... Gold Leaching from Refractory Ores—Literature Survey ... DMI Refractory Gold Process ... Read more. pretreatment of refractory ores ...
The process of sulphide concentrates treatment named "Albion" (Albion Process™) represents a combination of ultrafine grinding and oxygen oxidation without pressure and external heating. The process has a number of advantages: sodium cyanide consumption decrease during gold leaching and high ecological compatibility.
This paper reviews recent progress in the use of microorganisms tooxidize the sulfidic matrix in refractory gold ores (biooxidation) and to solubilize elemental gold (bioleaching).
Trans. Nonferrous Met. Soc. China 27 (201 7 ) 1143−1149 Microbial oxidation of refractory gold sulfide concentrate by a native consortium N. MARCHEVSKY 1, 2, M. M. BARROSO QUIROGA, A. GIAVENO3, E. DONATI 1.
While biooxidation was efficient in both cases (approximately 90% of sulfide sulfur was oxidized), the efficiency of cyanidation was low (39 and 32%, respectively). This fact suggests high efficiency of biooxidation is insufficient for efficient treatment of doublerefractory goldbearing sulfide ore concentrates.
Zinc sulfide concentrates Determination of silver and gold contents Fire assay and flame atomic absorption spectrometric method using scorification or cupellation
refractory gold ores Download refractory gold ores or read online here in PDF or EPUB. ... and the treatment of refractory gold ore, ... Symposium Treatment of Complex and . Treatment of Complex and Refractory Ores Symposium (Wed June 1) An increasing proportion of the world's gold ores can be characterised as complexor refractory.
A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of the pulp is controlled to be 10 or less than 10.
AND TREATMENT OF REFRACTORY SULPHIDE ORES In the last two decades a considerable number of new hydrometallurgical processes have been developed and implemented in gold industry allowing the economical treatment of increasingly complex and lower grade ores as well as refractory ores. As a result, all over the world the production of gold has almost doubled in the last 20 years.
This process, which has been developed for the treatment of highgrade sulphide flotation concentrates, is proposed for the pretreatment of goldbearing sulphide ores. 1. I N T R O D U C T I O N Refractoriness Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine ...