high pressure oxidation of refractory gold minerals

high pressure oxidation of refractory gold minerals

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  • ALTA MetBytes

    implemented by Barrick to treat double refractory gold ore following pressure oxidation at its Goldstrike Mine in Nevada, USA The CSIRO reagent system is an alternative to cyanide and has particular application where cyanide cannot be used and to unlock stranded high-grade deposits...

  • Gold processing

    Oxidation can also be accomplished by the use of high-pressure reactors called autoclaves, in which the minerals in an aqueous slurry are treated at high temperature and pressure with oxygen-bearing gas After oxidation is complete, cyanidation, as described above, is employed to solubilize and extract the gold...

  • Pressure Oxidation

    Pressure Oxidation (POX) is a process used to extract gold, copper, zinc, molybdenum, and uranium from refractory ore bodi 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 ,...

  • Valves for gold autoclave pressure oxidation (POX)

    Autoclave pressure oxidation (POX) is an effective pre-treatment option when extracting gold from refractory ore bodies, such as pyrite and arsenopyrite While gold processing plants are the most common utilizers of POX technology, the process can also be ,...

  • Gold extraction

    Pressure oxidation (POX) remains a further option for the oxidation of refractory sulfid Several projects have been recently constructed: the Killita Project in Finland, the Amursk Project in Russia, the Pueblo Viejo Project in the Dominican Republic, and the MOPU expansion at Lihir...

  • Gold processing 101

    Gold:sulphur ratio (GSR) Refractory ores are typically treated by flotation and the resulting flotation concentrate may be sold directly to a smelter (common for example in China) or subjected to downstream processing by pressure oxidation or bio-leach...

  • Pressure oxidation of pyrite

    Pressure oxidation of pyrite-arsenopyrite refractory gold concentrate Article in Physicochemical Problems of Mineral Processing 49(1):101-109 January 2013 with 243 Reads How we measure 'reads'...

  • Atmospheric alkaline pre

    Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold This pre-treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 throughout the test Three ....

  • Treatment of carbonaceous refractory gold ores

    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...

  • Refractory Gold Processes

    Your gold concentrate will afterwards undergo ultrafine grind and go for the cheapest oxidation there is ie: Atmospheric or Low Pressure Oxidation before going to classic CIL This last more costly option is commonly known as POX or High Pressure Oxidation for the most difficult refractory gold or...

  • Alkaline Oxidative Leaching of Gold

    their possible applications to treat refractory gold ores (5) These processes can be classified as pressure oxidation (6), biological oxidation (7), and chemical oxidation (8)...

  • Ultra Fine Grinding

    The traditional approach for such refractory material has been to liberate the locked gold by chemically destroying the pyrite through oxidation Roasting, pressure oxidation, and bacterial oxidation all employ various degrees of temperature, pressure and catalysis to react the pyrite with oxygen to produce an iron oxide and sulphur by-products ....

  • Pressure oxidation

    Pressure Oxidation is a process for extracting gold from refractory ore The most common refractory ores are pyrite and arsenopyrite, which are sulfide ores that trap the gold within themRefractory ores require pre-treatment before the gold can be adequately extracted The pressure oxidation process is used to prepare such ores for conventional gold extraction processes such as cyanidation...

  • REFRACTORY GOLD

    REFRACTORY GOLD By definition, refractory gold ores contain gold that is resistant to extraction by conventional chemical processing and as a result responds poorly to traditional gold cyanidation techniques such as Carbon-in-Leach (CIL), yielding less than 80% of the contained gold...