oxidation of gold ores

oxidation of gold ores

2022-08-07T14:08:20+00:00
  • Pressure oxidation Wikipedia

    The pressure oxidation process is used to prepare such ores for conventional gold extraction processes such as cyanidation It is performed in an autoclave at high pressure and temperature, where highpurity oxygen mixes with a slurry of ore(6), biological oxidation (7), and chemical oxidation (8) Emerging pressure oxidation processes that can be used to treat goldbearing arsenopyrite include a calcium chlorideoxygen leaching procedure (9) and the arseno process (10) The two procedures are unique in that mildAlkaline Oxidative Leaching of GoldBearing Arsenopyrite OresJan 01, 2005  Oxidation releases encapsulated gold grains from the sulfides and makes the oxidation residue of the ore or concentrate more amenable for gold recovery by cyanidation in a subsequent leaching step Pressure oxidation of gold ores is therefore a pretreatment leaching step to enhance gold Pressure oxidation overview ScienceDirect

  • Pressure Oxidation Pretreatment of Refractory Gold

    Up to10%cash back  Feb 01, 1984  Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold This is particularly true when an appreciable portion of the gold is associated with sulfides and is not amenable to conventional cyanidationUp to10%cash back  The early work was championed by Eric LiveseyGoldblatt, the manager of GENCOR Process Research who directed pioneering and innovative research into bacterial oxidation of refractory gold ores prior to cyanidationThe BIOX® Process for Biooxidation of GoldBearing Ores or Jul 14, 2016  Some stibnite gold ores are more amenable to cyanidation when previously subjected to surface oxidation in the pulverulent condition, with the formation of a sulphate film, which on contact with water yields an insoluble basic sulphate The oxidation may also open up the fissure planes, setting free the associated goldRefractory Gold Ore Treatment Methods

  • [Oxidation of goldantimony ores by a thermoacidophilic

    Independent on the Sb(S) concentration in the experimental sample, after adaptation to a specific ore and pulp compaction the microorganisms grew actively and leached/oxidized all goldantimony ores at 39 ± 1 degrees C The lower was the content of iron and arsenic sulfides, the Jan 01, 2005  Pressure oxidation of gold ores is therefore a pretreatment leaching step to enhance gold recovery In a very broad sense the definition of hydrometallurgy is ( Tottle, 1985 ): “That branch of metallurgy concerned with the science and art of extraction of metals from their ores by processes involving solution in water”Pressure oxidation overview ScienceDirectBiooxidation of gold ores or concentrates could be a very attractive alternative to pressure oxidation (POX) or roasting to liberate the gold grains from various sulfides Crushed heap bioleaching was successful in US and many operations using tank bioleaching of gold concentrate are currently running around the worldEconomic evaluation of biooxidation of gold ores

  • (PDF) Biooxidation of sulfidic refractory gold ores

    As the scarcity of oxide gold ore deposits increases, the demand for more efficient ways to process refractory sulfidic gold ores increases as well Most deposits in the USA are considered to be refractory sulfides While, without the oxidation of the sulfidic coating, the gold Abstract GENCOR SA Ltd has pioneered the commercialization of biooxidation of refractory gold ores Development of the BIOX ® process started in the late 197os at GENCOR Process Research, in Johannesburg, South Africa The early work was championed by Eric LiveseyGoldblatt, the manager of GENCOR Process Research who directed pioneering and innovative research into bacterial oxidation The BIOX® Process for Biooxidation of GoldBearing Ores or Jun 06, 2015  Here is a simplified presentation of how gold can be obtained from refractory gold ores using a combination of flotation and bacterial oxidation using thiobaBiological Oxidation of refractory gold ore YouTube

  • Ore deposits formed by oxidation and supergene enrichment

    Ore Deposits Formed by Oxidation and Supergene Enrichment When ore deposits are exposed to the oxidation zone they are weathered and altered with the country rocks The surface waters oxidize many ore minerals and yield solvents that dissolve other minerals An orebody thus becomes oxidized and generally leached of many of its valuable materials down to the groundwater table, or to cial plant which applied bacterial oxidation to pretreat refractory gold ores was built in South Africa After bacterial oxidation, sulphide decomposition, arsenic comes into the solution, so as to remove arsenic The process is showed in Fig 4 The reactions are as follows: 39 4 23 2 33 3 43 FeAsS NaOH O Na AsS Na AsO Fe OH ++ =+ +() 4412 36 Review Pretreatment Process on Refractory Gold Ores with Asprocessing refractory gold ores, especially development in the pretreatment of refractory gold minerals by nitric acid These processes include the highpressure and the atmosphericpressure oxidation methods Highpressure oxidation processes are difficult to carry out, because they require highcapital cost autoclavesDevelopments in the pretreatment of refractory gold

  • ALTA MetBytes What's Happening in Gold Ore Processing

    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 highgrade depositsJul 01, 2017  Preoxidation with H 2 O 2 prior to cyanidation increased DO from 1 up to 72 ppm H 2 O 2 was injected at a rate of 024 kg 100% H 2 O 2 /t of dry ore prior to cyanidation NaCN consumption was reduced from 052 to 040 kg/t Au recovery was increased from average 913 to 925%Improvements in gold ore cyanidation by preoxidation with Atmospheric alkaline preoxidation of refractory sulphide gold ores Creator Rego, Alan Joseph Publisher University of British Columbia Date Issued 2018 Description Four ironsulphidecontaining gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to Atmospheric alkaline preoxidation of refractory sulphide

  • gold refractory,ore classification,preprocessing methods

    Gold ore like pyrrhotite In the heat, using alkaline air oxidation method is easier to complete alkaline preoxidation for pyrrhotite, so makes gold easier to cyanide and leach 4 Telluride and sulfursalt gold oreJun 01, 1994  Abstract Much recent work in the field of biohydrometallurgy has been directed to the study of biooxidation of gold ores by acidophilic iron and sulfur oxidizing microorganisms This work has been done worldwide and has resulted in several pilot plant and commercial scale operations for gold ore biooxidationMicrobial oxidation of gold ores and gold bioleaching Jun 01, 1994  Abstract Much recent work in the field of biohydrometallurgy has been directed to the study of biooxidation of gold ores by acidophilic iron and sulfur oxidizing microorganisms This work has been done worldwide and has resulted in several pilot plant and commercial scale operations for gold ore biooxidationMicrobial oxidation of gold ores and gold bioleaching

  • Biological Oxidation of refractory gold ore YouTube

    Jun 06, 2015  Here is a simplified presentation of how gold can be obtained from refractory gold ores using a combination of flotation and bacterial oxidation using thiobaThe extraction of gold from ores and electronic waste is an important topic worldwide, as this precious metal has immense value in a variety of fields However, serious environmental pollution and high energy consumption due to the use of toxic oxidation reagents and harsh reaction conditions is a wellknown problem in the gold industryEnvironmentally Benign, , and Selective Extraction of Pyrite and arsenopyrite are known to be the most common goldbearing sulfide minerals in refractory gold ores Traditionally, these minerals have beenSimultaneous sulfide oxidation and gold dissolution by

  • Ore deposits formed by oxidation and supergene enrichment

    Ore Deposits Formed by Oxidation and Supergene Enrichment When ore deposits are exposed to the oxidation zone they are weathered and altered with the country rocks The surface waters oxidize many ore minerals and yield solvents that dissolve other minerals An orebody thus becomes oxidized and generally leached of many of its valuable materials down to the groundwater table, or to An investigation has been conducted into the nature and rates of the physical, chemical, biological, and thermal processes involved in the heap biooxidation of pyrite from refractory gold ores A heapscale model of the ideal process was developed, aided by a systematic experimental approach, which accounts for the following phenomena GrainScale Kinetics The thermal and chemical Understanding the heap biooxidation of sulfidic refractory A major revolution in gold processing was the pressure oxidation of refractory, pyritic ores In these ores, gold is chemically entrained in sulfides which require oxidation prior to standard cyanidation techniques Many of these plants were built in the western United States in PRESSURE LEACHING RPMGlobal

  • gold refractory,ore classification,preprocessing methods

    Gold ore like pyrrhotite In the heat, using alkaline air oxidation method is easier to complete alkaline preoxidation for pyrrhotite, so makes gold easier to cyanide and leach 4 Telluride and sulfursalt gold oreprocessing refractory gold ores, especially development in the pretreatment of refractory gold minerals by nitric acid These processes include the highpressure and the atmosphericpressure oxidation methods Highpressure oxidation processes are difficult to carry out, because they require highcapital cost autoclavesDevelopments in the pretreatment of refractory gold 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 highgrade depositsALTA MetBytes What's Happening in Gold Ore Processing

  • CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF

    For extraction of gold from the refractory ores in which gold is surrounded by sulfide minerals, oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold Pyrometallurgical oxidation by roasting is encountered with environmental limitations; thus hydrometallurgical methods are preferred These methods includecarbonaceous gold ores were introduced, including high temperature roasting, biooxidation, chemical oxidation, competitive adsorption, barrier inhibition and microwave roasting Recently, biooxidation was developed rapidly due to its advantages such asResearch status of carbonaceous matter in carbonaceous This means that even refractory ores and concentrates where gold is evenly distributed among pyrite may respond to selective bacterial oxidation [ 37 ] Besides, bacterial attack of the sulphide appears to be preferential in goldrich regions because gold acts like the cathode in the gold (PDF) Refractory goldbearing ores: a review of treatment

  • Application ABB Analytical – pH/ORP Bacterial action on

    Biological oxidation is relatively new, but as surface oxide reserves become depleted, it will see increasing use in processing deeper refractory sulfitic gold ores and ores of other metals, such as copper and nickel Liberating gold Several different methods are available to carry out bacterial oxidation on a commercial scale

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