Pressure oxidation Wikipedia
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 them Refractory ores require pretreatment before the gold can be adequately extractedPressure 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 formedPRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE 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 Since the nature and composition of the reaction products can have a considerable impact on the downstream operations of gold and silver ACID PRESSURE OXIDATION OF REFRACTORY GOLD MINERAL Pressure oxidation of pyritearsenopyrite refractory gold concentrate 105 350 kPa, 15%) or increased very slowly (test 3, 165°C, 1050 kPa, 5%) At higher tem perature and oxygen pressure the oxygen consumption was more rapid and reached a steady level in 55–60 minutes (test 9 I, PRESSURE OXIDATION OF PYRITEARSENOPYRITE REFRACTORY sulphide minerals are oxidised, there is no question that the chemical and mineralogical compositions of the oxidation products vary depending on the oxidation process that is used Metallurgical testwork was undertaken by SGS Minerals Metallurgy (Malaga, Western Australia) in which a refractory gold ore was beneficiated by bench scale flotation to produce a bulk sulphide concentrate AN INVESTIGATION OF PRESSURE, ATMOSPHERIC AND
Gold mineral processing Hatch Ltd
Treatment of refractory gold ore (whole ore and flotation concentrates) has become more prominent since the 1980s, with many gold discoveries often including ores that are wholly or partially refractory Refractory pretreatment processes include pressure oxidation, biological 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 Since the nature and composition of the reaction products can have a considerable impact on the downstream operations of gold and silver ACID PRESSURE OXIDATION OF REFRACTORY GOLD MINERAL PRESSURE OXIDATION OF PYRITEARSENOPYRITE REFRACTORY GOLD CONCENTRATE Lauri RUSANEN, Jari AROMAA, Olof FORSEN Aalto University, Department of Materials Science PO Box 16200, Aalto, Espoo, Finland, Abstract: Refractory gold ores have poor gold recoveries with direct cyanide leaching Typically the refractoriness is due to encapsulation of the gold PRESSURE OXIDATION OF PYRITEARSENOPYRITE REFRACTORY GOLD Roasting is the only commercialised process in Zimbabwe for the pretreatment 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 The process resulted in substantially higher gold An acidic pressure oxidation pretreatment of refractory Gold recovery from refractory gold concentrates by pressure oxidation pretreatment and thiosulfate leaching Li Yu 1, gold, pressure oxidation, thiosulfate, leaching, RSM 1 Introduction Gold was an important rare and precious metal, always coexists with sulphide minerals such as pyrite and arsenopyrite (Azizi et al, 2010; Nunan et al, 2017) Due to the depletion of highgrade gold ores Gold recovery from refractory gold concentrates by
High Pressure Oxidation Of Refractory Gold Minerals
Chemical symbol for gold autoclave pressure oxidation gold au Highpressure oxidation of refractory gold ores and high pressure oxidation of refractory gold minerals high pressure oxidation of refractory gold minerals Gulin supply Mining and ?More Read More Abstract The complex mineralogy of the Porgera resource has a pronounced effect on process selection for the recovery of refractory gold The highpressure nitric acid oxidation process is shown in Figure 1 LI, DX Developments on the pretreatment of refractory gold minerals by nitric acid World Gold Conference 2009,The Southern African Institute of Mining and Metallurgy, 2009 Developments in the pretreatment of refractory gold minerals by nitric acid DX LIDevelopments in the pretreatment of refractory gold high pressure oxidation of refractory gold minerals Pressure oxidation (POX) leaching has been commercially applied to refractory gold ores since the 1980s In the process, sulphide material is oxidised and dissolved in order to release the gold encapsulated in the sulphide matrix, making the gold available for further recoveryHigh Pressure O Idation Of Refractory Gold Mineralsoptions for refractory gold ores: roasting; pressure oxidation; biooxidation; and ultrafine grinding In roasting, pressure oxidation and biooxidation, the iron sulphide minerals are oxidised to create sulphur dioxide (SO 2) gas in the case of roasting, or sulphate ions in pressure oxidation and biooxidation The iron component is oxidised to the trivalent state and forms solid compounds Recovery Refractory Resources SGSPressure 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 formedhigh pressure oxidation of refractory gold minerals
oxidation of gold ore processing equipment for attapulgite
PRESSURE OXIDATION OF REFRACTORY GOLD Mineral Pressure oxidation test work was conducted in North America and in Australia on concentrates containing 28 – 38 g/t gold, 100 – 117 g/t silver, 24 – 26% iron and 27 – 29% sulfur The results of this work and a high level presentation of their impact on engineering outcomes are presented in this paper ALTA 2014 GoldPM Proceedings options for refractory gold ores: roasting; pressure oxidation; biooxidation; and ultrafine grinding In roasting, pressure oxidation and biooxidation, the iron sulphide minerals are oxidised to create sulphur dioxide (SO 2) gas in the case of roasting, or sulphate ions in pressure oxidation and biooxidation The iron component isRecovery Refractory Resources SGSA pressure oxidation process in an autoclave has been evaluated as an alternative The process resulted in substantially higher gold recoveries (>90%) over shorter periods The results also show that a near quantitative silver recovery (62%) over even shorter periods of 12 minutes is possible The dependence of these recoveries on temperature, retention time, pulp density, oxygen partial pressure, particle size An acidic pressure oxidation pretreatment of refractory Physical Encapsulation Physical encapsulation can be overcome by ultrafine grinding; however, this is often not economically viable If the gold is encapsulated in sulfides, oxidation of the sulfide minerals by roasting, pressure oxidation or biooxidation can be employedGold Recovery 101 From Sepro's Gold Recovery ExpertsThe atmospheric pressure process utilizes nitric acid at a temperature of approximately 80–100°C, an oxidizing time of 60–120 minutes, a concentration of 4N nitrosulphuric acid, and a liquid to solid ratio of 6:1 to oxidize sulphide minerals, releasing gold for recovery by conventional methodsDevelopments in the pretreatment of refractory gold
High Pressure Oxidation Of Refractory Gold Minerals
Chemical symbol for gold autoclave pressure oxidation gold au Highpressure oxidation of refractory gold ores and high pressure oxidation of refractory gold minerals high pressure oxidation of refractory gold minerals Gulin supply Mining and ?More Read More Abstract The complex mineralogy of the Porgera resource has a pronounced effect on process selection for the recovery of refractory gold high pressure oxidation of refractory gold minerals Pressure oxidation (POX) leaching has been commercially applied to refractory gold ores since the 1980s In the process, sulphide material is oxidised and dissolved in order to release the gold encapsulated in the sulphide matrix, making the gold available for further recoveryHigh Pressure O Idation Of Refractory Gold MineralsPressure 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 formedhigh pressure oxidation of refractory gold mineralsPRESSURE OXIDATION OF REFRACTORY GOLD Mineral Pressure oxidation test work was conducted in North America and in Australia on concentrates containing 28 – 38 g/t gold, 100 – 117 g/t silver, 24 – 26% iron and 27 – 29% sulfur The results of this work and a high level presentation of their impact on engineering outcomes are presented in this paper ALTA 2014 GoldPM Proceedings oxidation of gold ore processing equipment for attapulgite Among all the processes, acidic pressure oxidation is the prime commercial choice for pretreatment of many refractory sulfidic gold ores and concentrates, especially in North America 2 Acid pressure oxidation is considered to be the most effective because of A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE OXIDATION
high pressure oxidation of refractory gold minerals
high pressure oxidation gold Mining High pressure oxidation of refractory gold minerals Mining Many researches consider this process as the best alternative to the treatment of refractory material containing gold and silver, mainly when the precious metals are 187More detailed High Pressure Oxidation Gold Manganese
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