Pressure oxidation of double refractory gold bearing sulphide Concentrates

2019 ◽  
pp. 55-66
Author(s):  
Ya. M. Shneerson ◽  
◽  
L. V. Chugaev ◽  
Keyword(s):  
Pressure Oxidation ◽  
Refractory Gold ◽  
Gold Bearing

scholarly journals Pressure oxidation of refractory gold-bearing concentrates using halogen-containing solvents and adsorbent

2015 ◽  
pp. 29-33
Author(s):  
A. V. Boldyrev ◽  
◽  
S. V. Balikov ◽  
A. V. Bogorodskiy ◽  
Yu. E. Emelyanov ◽  
...  
Keyword(s):  
Pressure Oxidation ◽  
Refractory Gold ◽  
Gold Bearing

scholarly journals Oxidation of pyrite: Consequences and significance

2002 ◽  
Vol 56 (7-8) ◽  
pp. 299-316 ◽  
Author(s):  
Mile Dimitrijevic ◽  
Milan Antonijevic ◽  
Valentina Dimitrijevic
Keyword(s):  
Pyrite Oxidation ◽  
Bacterial Oxidation ◽  
Pressure Oxidation ◽  
Sulphide Minerals ◽  
Electrochemical Processes ◽  
Refractory Gold ◽  
Points Of View ◽  
Galvanic Interaction ◽  
Spontaneous Oxidation ◽  
Gold Bearing

This paper presents the most important studies on the oxidation of pyrite particularly in aqueous solutions. The consequences of pyrite oxidation was examined, as well as its importance, from both the technical-technological and environmental points of view. The oxidation of pyrite was considered in two parts. The spontaneous oxidation of pyrite in nature was described in the first part, with this part comprising pyrite oxidation in deposits depots and mines. It is explained how way natural electrochemical processes lead to the decomposition of pyrite and other minerals associated with pyrite. The oxidation of pyrite occurring during technological processes such as grinding, flotation and leaching, was shown in the second part. Particular emphasis was placed on the oxidation of pyrite during leaching. This part includes the leaching of sulphide and oxide ores, the leaching of pyrite coal and the leaching of refractory gold-bearing ores (pressure oxidation, bacterial oxidation, oxidation by means of strong oxidants and the electrolysis of pyrite suspensions). Various mechanisms of pyrite oxidation and of the galvanic interaction of pyrite with other sulphide minerals are shown.

Processing of gold-antimony concentrates

2021 ◽  
pp. 59-65
Author(s):  
A. V. Markelov ◽  
K. M. Falin ◽  
V. A. Puchkina ◽  
A. N. Titova
Keyword(s):  
Selective Extraction ◽  
Leaching Rate ◽  
Pressure Oxidation ◽  
Selective Precipitation ◽  
Refractory Gold ◽  
Atmospheric Leaching ◽  
The Common ◽  
Two Stages ◽  
Special Process

This paper describes the results of a study that looked at processing of goldantimony concentrates with selective extraction of antimony and gold as commodities. The common global practice of processing antimony sulphide concentrates (20–30% Sb) is based on alkaline sulphide leaching followed by precipitation of metallic antimony by electrowinning. However, application of this technique to process sulphide concentrates that, apart from antimony, also contain gold, can be difficult as, together with antimony, up to 10–15% of gold can leach to the solution. It takes a special process during final refining of cathode antimony to recover that gold. This paper describes a process that involves two stages of atmospheric leaching of antimony. The gold that leached to the solution is precipitated with zinc after the first stage of antimony leaching. Together with atmospheric leach tailings, it then goes to the pressure oxidation unit. This process helps oxidize the rest of the sulphides and release refractory gold. The resultant cake is processed following a standard sorption cyanidation technique. The paper looks at the antimony leaching rate and the rate at which gold leaches to the solution during this process. The paper describes the results of selective precipitation of gold from gold-antimony solutions and highlights certain features of this process. A series of tests was conducted to test the techniques of pressure oxidation of atmospheric leach tailings and cyanidation of the residue. The paper also describes a process that was developed for processing of goldantimony concentrates and precipitation of antimony and gold. An antimony recovery exceeding 90–95% can be achieved when using this process. At the same time, the percent of dissolved gold can be reduced from 10–15 tо 1–3%.

Two-stage bacterial–chemical oxidation of refractory gold-bearing sulfidic concentrates

2010 ◽  
Vol 101 (1-2) ◽  
pp. 28-34 ◽  
Author(s):  
Natal'ya V. Fomchenko ◽  
Maxim I. Muravyov ◽  
Tamara F. Kondrat'eva
Keyword(s):  
Chemical Oxidation ◽  
Two Stage ◽  
Refractory Gold ◽  
Gold Bearing

scholarly journals Process simulation and gate-to-gate life cycle assessment of hydrometallurgical refractory gold concentrate processing

2019 ◽  
Vol 25 (3) ◽  
pp. 456-477 ◽  
Author(s):  
Heini Elomaa ◽  
Pia Sinisalo ◽  
Lotta Rintala ◽  
Jari Aromaa ◽  
Mari Lundström
Keyword(s):  
Global Warming ◽  
Life Cycle Assessment ◽  
Life Cycle ◽  
Environmental Impacts ◽  
Process Simulation ◽  
Development Stage ◽  
Environmental Indicators ◽  
Gold Recovery ◽  
Pressure Oxidation ◽  
Refractory Gold

Abstract Purpose Currently, almost all cyanide-free gold leaching processes are still in the development stage. Proactively investigating their environmental impacts prior to commercialization is of utmost importance. In this study, a detailed refractory gold concentrate process simulation with mass and energy balance was built for state-of-the-art technology with (i) pressure oxidation followed by cyanidation and, compared to alternative cyanide-free technology, with (ii) pressure oxidation followed by halogen leaching. Subsequently, the simulated mass balance was used as life cycle inventory data in order to evaluate the environmental impacts of the predominant cyanidation process and a cyanide-free alternative. Methods The environmental indicators for each scenario are based on the mass balance produced with HSC Sim steady-state simulation. The simulated mass balances were evaluated to identify the challenges in used technologies. The HSC Sim software is compatible with the GaBi LCA software, where LCI data from HSC-Sim is directly exported to. The simulation produces a consistent life cycle inventory (LCI). In GaBi LCA software, the environmental indicators of global warming potential (GWP), acidification potential (AP), terrestrial eutrophication potential (EP), and water depletion (Water) are estimated. Results and discussion The life cycle assessment revealed that the GWP for cyanidation was 10.1 t CO2-e/kg Au, whereas the halogen process indicated a slightly higher GWP of 12.6 t CO2-e/kg Au. The difference is partially explained by the fact that the footprint is calculated against produced units of Au; total recovery by the halogen leaching route for gold was only 87.3%, whereas the cyanidation route could extract as much as 98.5% of gold. The addition of a second gold recovery unit to extract gold also from the washing water in the halogen process increased gold recovery up to 98.5%, decreasing the GWP of the halogen process to 11.5 t CO2-e/kg Au. However, both evaluated halogen processing scenarios indicated a slightly higher global warming potential when compared to the dominating cyanidation technology. Conclusions The estimated environmental impacts predict that the development-stage cyanide-free process still has some challenges compared to cyanidation; as in the investigated scenarios, the environmental impacts were generally higher for halogen leaching. Further process improvements, for example in the form of decreased moisture in the feed for halide leaching, and the adaptation of in situ gold recovery practices in chloride leaching may give the cyanide-free processing options a competitive edge.

An acidic pressure oxidation pre-treatment of refractory gold concentrates from the KweKwe roasting plant, Zimbabwe

1999 ◽  
Vol 12 (8) ◽  
pp. 863-875 ◽  
Author(s):  
F.P. Gudyanga ◽  
T. Mahlangu ◽  
R.J. Roman ◽  
J. Mungoshi ◽  
K. Mbeve
Keyword(s):  
Pressure Oxidation ◽  
Refractory Gold ◽  
Pre Treatment

scholarly journals Bio-oxidation of a refractory gold bearing high arsenic sulphide concentrate: A pilot study

1993 ◽  
Vol 11 (1-3) ◽  
pp. 243-252 ◽  
Author(s):  
J.T. Chapman ◽  
P.B. Marchant ◽  
R.W. Lawrence ◽  
R. Knopp
Keyword(s):  
Pilot Study ◽  
Refractory Gold ◽  
High Arsenic ◽  
Gold Bearing
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