Jul 14, 2016 · The oxidation may also open up the fissure planes, setting free the associated gold. This oxidation may be secured by “weathering” the ore pulp, but in some cases, the agitation of the wet pulp with small amounts of lime and sodium peroxide, together with injected air prior to the addition of cyanide, may be effective
Jan 01, 1987 · Arsenopyrite and pyrite are the most common mineral carriers of refractory gold. Pressure oxidation of these refractory gold mineral carriers is a very complex reaction system involving several oxidation and hydrolytic reactions which occur in series and/or parallel. Moreover these oxidation reactions are highly exothermic
Pressure Oxidation (POX) is a process used to extract gold, copper, zinc, molybdenum, and uranium from refractory ore bodies. The POX process utilizes elevated temperatures (roughly 230 degrees Celsius), elevated pressures (roughly 35 bar or 510 psi), and oxygen to liberate the minerals from refractory ores. POX has been used since 1985 when it was first put into commercial production at Homestake’s …
It oxidizes and decomposes gold bearing sulfide to make gold exposed from ores under conditions of high temperature and pressure. 23) The main chemical reactions are: 4 Fe 2 AsS + 13 O 2 ( g ) + 6 H 2 O = 4 FeS O 4 + 4 H 3 As O 4
Pressure oxidation was developed for processing refractory ores where gold is occluded in the sulfide minerals typically pyrite or arsenopyrite Oxidation of the sulfides at elevated temperatures and pressures liberates the gold allowing it to be economically recovered by conventional circuits. Learn More
Aug 11, 2018 · Pressure oxidation of the refractory sulfide/carbonaceous ores has gained world-wide acceptance. Compared with roasting, pressure oxidation yields higher gold extractions from ores or concentrates and enables better handling of environmentally sensitive impurities. Normally, gold is extracted from neutralized autoclave leach residue by cyanidation
Jul 16, 2016 · Abstract. Carbonate decomposition of carbonic refractory gold ore and the following pressure oxidation were studied. In the carbonate decomposition procedure, the effects of liquid-to-solid ratio and reaction time on decomposition ratio of carbonate were investigated. The experimental result shows that the decomposition ratio of carbonate is 98.24% under the conditions of liquid-to-solid ratio …
Jan 01, 1991 · Refractory ore treatment by this method normally gives gold extraction in excess of 95%. Autoclave leaching of refractory gold ores on an industrial scale started in the 1980's because of the high gold price and because pressure oxidation is an environmentally accepted alternative to roasting
Nov 11, 2020 · The main methods used in industrial production for the treatment of refractory gold ore or gold concentrate are roasting, pressure oxidation and bacterial oxidation. All these methods have many years of production experience
Aug 18, 2020 · The alkaline hot-pressure oxidation is only suitable for refractory gold deposits with high carbonate content and low sulfide content (<20%). The acidic hot-pressure oxidation means that the pyrite, arsenopyrite and other sulfides react with the oxygen in an acidic medium under the high temperature and high pressure
Published 1999. Chemistry. Minerals Engineering. Roasting is the only commercialised process in Zimbabwe for the pre-treatment of refractory gold feedstocks for the subsequent cyanidation leaching. This process results in only about 75% gold recovery and is characterised by high gold values in the residue. A pressure oxidation process in an autoclave has been evaluated as an alternative
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