autoclave pressure oxidation gold au
Autoclave and Pressure Oxidation 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
Autoclave pressure oxidation POX is an effective pretreatment 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
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It is performed in an autoclave at high pressure and temperature where highpurity oxygen mixes with a slurry of ore When the original sulfide minerals are oxidized at high temperature and pressure it completely releases the trapped gold Pressure oxidation has a very high gold recovery rate normally at least 10 higher than roasting
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Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores The main pressure oxidation products from iron sulfide minerals are sulfuric acid and metal sulfates and hematite Depending on the conditions within the autoclave acid containing iron compounds can be formed
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A carbonaceous refractory sulphide ore is processed in an autoclave pressure oxidation plant and subsequently subjected to a cyanide leaching An initial mineralogical study of the feed ore by quantitative dynamic SIMS analysis has shown that 95 of the gold is contained as submicroscopic gold in pyrite with the remainder contained in primary Feoxide minerals
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Pressure oxidation of gold ores is therefore a pretreatment leaching step to enhance gold recovery Although pressure oxidation of gold ores and concentrates does not directly recover gold in a strict sense of the above definition it is an essential step to enable the gold to be recovered
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Nonacidic pressure oxidation techniques such as alkaline pressure oxidation use similar conditions of temperature pressure and oxygen to acidic route but the process is run under alkaline or neutral conditions ALS Metallurgy incorporates POX testwork in a variety of metallurgical test program flow sheets in particular those involving semirefractory and refractory gold ores
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The reasons for goldbearing materials refractory nature and behaviour features of carbonaceous matter during pressure oxidation of concentrates were discussed The chemical processes that lead to gold losses during high pressure hydrometallurgical treatment of double refractory materials were examined
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Sulfide sulfur oxidation through the autoclave is typically of the order of 9092 Residual S exiting the autoclave is targeted at less than 02 Values greater than 025 S“ typically result in poorer gold recoveries in the C1L circuit Freeacid levels in the autoclave discharge are a function of S2 and CO2 in the autoclave feed but normally range from 10 to 25 gL H2S04
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At Lone Tree nitrogen gas flotation is used to minimize oxidation of arsenian pyrite during flotation Straight cyanidation of goldbearing pyrite usually results in poor recoveries so a precyanide oxidation step is used Roasting and hightemperature highpressure oxidation in an autoclave are the two two main methods used
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Pressure Oxidation Gold Circuits Basic Ferric Arsenate Sulfate and Basic Ferric Sulfate Behaviour in Downstream Processing Conference Paper PDF Available · August 2017 with 365 Reads How we
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partly as AuICl and partly as metallic gold The relative amount of metallic gold increased with temperature but decreased with high chloride ion concentration The second type carboninautoclave of experiment involved pressure leaching at 155
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Batch Autoclave Laboratory Procedures The vessel used for the laboratory pressure oxidation process was a twoliter Parr titanium autoclave with dual impellers It was heated and cooled externally and was pressurized with commercialgrade oxygen A positive bleed of offgas was maintained in each test the rate was measured in the offgas after the steam was removed with a condenser and desiccant
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Mar 11 2017 · An autoclave is a pressure chamber used to carry out industrial processes requiring elevated temperature and pressure different from ambient air pressure POX Autoclave Slurry Flow Control Pressure oxidation POX autoclave leaching is an effective method to recover refractory gold
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Deportment of gold in an autoclave pressure oxidation AC Request for analysis A carbonaceous refractory sulphide ore is processed in an autoclave pressure oxidation plant and subsequently subjected to a cyanide leaching More Info pressure oxidation autoclave au prodorecoza
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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
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The pressure oxidation area included autoclave vessels and auxiliary components slurry preheat vessels pressure letdown vessels vent gas cyclones vent gas quenching gas scrubbing and related support services and utilities The autoclaves were designed selected and had specified linings and installation requirements
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Au • Oxidation of Auo is more favourable due to common ion effect according to this reaction AuCl 4 3 eÆAuo 4 Cl• Study extended to effect of temperature ferrousferric ratio and H 2SO 4 concentration
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oxidation resulted in similar or slightly higher gold recovery at significantly lower cyanide consumption Capex estimate of the pressure oxidation process was higher than bacterial oxidation but a significant portion of the arsenic was precipitated in the autoclave as an environmentally stable compound A feasibility study was conducted at
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At 195°C 700 kPa oxygen partial pressure and 10 slurry density the oxidation kinetics for complete sul fide conversion was about 60 minutes Slurry densities above 10 had an adverse effect on the oxidation rate when the temperature was below 225°C and oxygen partial pressure below 1050 kPa
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Autoclave and Pressure Oxidation Mining and Minerals Industries Pressure oxidation was developed for processing refractory ores where gold is occluded in
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Pressure oxidation POX is generally viewed as the most appropriate technolog y for the processing of arseniccontaining re fractory gold ores due to the stabilisation of arsenic in the leach res
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Sulfide Oxidation Pressure Alkaline Oxidation Test Work Au Leach vs Sulfide Oxidation • Scoping tests were conducted using pressure oxidation at 100°C and 40 psi oxygen overpressure1 • As shown in these graphs alkaline POX will effectively oxidize the sulfides allowing for
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First Quantum Minerals Provides an Update and Scoping Study Results For The High Pressure Oxidation and Leach Project At The Kansanshi CopperGold Mine The sulphide flotation concentrate treated by the autoclave will contain a nominal 29 copper and 8 gramstonne gold The concentrate is oxidised utilising two autoclaves
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gold mining companies that use pressure oxidation plants gold mining companies that use pressure oxidation plants Gold the free encyclopedia Gold is a dense soft shiny malleable and ductile metal and is a chemical element with the symbol Au and atomic number 79
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The Macraes Process Plant recovers gold by concentrating the metal into a relatively small fraction of flotation concentrate oxidising the reground concentrate in a pressure oxidation autoclave washing the oxidised residue and then utilising a carboninleach process to recover gold from the residue
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The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O pressure and NaOH concentration Dissolution of gold from the leach
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Furthermore autoclave oxidation was investigated to cotreat electronic and pyrite FeS 2 waste for extraction of metals from electronic waste 14 pressure oxidation and gold recovery tests without grinding stages Breaking FeNiCuAu bond was achieved by substrate oxidation and gold was recovered in its original solid state
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