• AU697526B2Regeneration of cyanide by oxidation of

    AU697526B2 AU28367/95A AUA AU697526B2 AU 697526 B2 AU697526 B2 AU 697526B2 AU 28367/95 A AU28367/95 A AU 28367/95A AU A AU A AU A AU 697526 B2 AU697526 B2 AU 697526B2 Authority AU Australia Prior art keywords method thiocyanate ph cyanide contacting Prior art date Legal status (The legal status is an assumption and is

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  • of cyanide in gold ore extraction

    It contains 99 sulphides of which 10 to 20 percent is pyrrhotite and 0.3 to 0.7 . Cyanide and removal options from effluents in gold mining . Cyanide in effluents resulting from gold mining is known to be the prime candidate for treatment. However according to a study by the Ontario Ministry of the Environment (Canada) ammonia suspended

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  • cyanide mineralicsfalconeborsellino

    A sodium cyanide solution is commonly used to leach gold from ore There are two types of leaching Heap leaching In the open cyanide solution is sprayed over huge heaps of crushed ore spread atop giant collection pads The cyanide dissolves the gold from the ore into the solution as it trickles through the heapGold Mining Process Development

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  • Pyrrhotite — An Important Gangue and a Source for

    Pyrrhotite crystallises as either a hexagonal or monoclinic structure both of which can occur in ore deposits. In general pyrrhotite is not considered as a valuable mineral unless it contains considerable amounts of other metals like nickel or copper. In fact it causes numerous problems in flotation including intensive oxygen consumption which results in poor

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  • How to Improve the Effect of Gold Cyanidation Process

    1. Gold Ore Associated with Plenty of Pyrite Pyrrhotite and Marcasite. This kind of ore is the associated minerals that can consume oxygen alkali and cyanide. It is easy to be oxidized and decomposed then the sulfate ferrous sulfate ferric subsulfate and ironthiosulfate are generated.

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  • Lime in Gold Ore Mining Process Flotation Cyanidation

    Aug 03 2019 · Generally speaking for the gold concentrate zinc powder replacement cyanide plant the CaO concentration in the noble liquid is controlled between 3 and 8/10 000 in actual production which can meet the service life of the replacement "golden cabinet" and guarantee Zinc powder consumption and gold replacement rate ensure the quality of

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  • INFLUENCE OF PRE-AERATION ON CYANIDE LEACHING OF A

    between gold and silver extractions and cyanide consumption. Ninity five Au and 88.0 Ag extractions were obtained under the determined conditions of 24 h leaching duration -74 µm particle size minerals like pyrrhotite. In another study Jeffrey and Breuer (2000) investigated the

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  • v118n5a2 Test work to examine the potential for improving

    increase in cyanide consumption. The introduction of lead nitrate resulted in a 34 g/t decrease in cyanide consumption. According to La Brooy Linge and Walker (1994) reactions involving sulphides may consume cyanide and oxygen and produce various solution species that can decrease the efficiency of gold leaching. Pyrrhotite is the most

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  • How to Improve the Effect of Gold Cyanidation Process

    1. Gold Ore Associated with Plenty of Pyrite Pyrrhotite and Marcasite. This kind of ore is the associated minerals that can consume oxygen alkali and cyanide. It is easy to be oxidized and decomposed then the sulfate ferrous sulfate ferric subsulfate and ironthiosulfate are generated.

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  • Cyanide Gold Extraction ProcessJXSC Machine

    Dec 20 2018 · The gold ore cyanide leaching pulp contains a certain amount of Fe2 Cu2 Zn2 S2- Fe3 plasma in addition to the metal sulfide mineral pyrite pyrrhotite chalcopyrite and sphalerite. The leaching process consumes a large amount of cyanide and dissolved oxygen and reduces the cyanide

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  • Pyrrhotite — An Important Gangue and a Source for

    Pyrrhotite crystallises as either a hexagonal or monoclinic structure both of which can occur in ore deposits. In general pyrrhotite is not considered as a valuable mineral unless it contains considerable amounts of other metals like nickel or copper. In fact it causes numerous problems in flotation including intensive oxygen consumption which results in poor

    Get Price
  • Pyrrhotitean overview ScienceDirect Topics

    Cyanide consumption decreased by approximately 8 . However without lead nitrate oxygen cannot be used to process this sulfide-bearing gold ore. The passive layer formed on gold grains by the dissolution of pyrrhotite cannot be avoided with oxygen as it was with lead nitrate.

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  • Cyanidation of a pyrrhotite-bearing gold ore

    The pyrrhotite was determined to be 50 monoclinic and 50 hexagonal. A leach using 8ppm dissolved oxygen yielded only 82.3 gold extraction with a 0.29kg/t NaCN consumed. The addition of lead nitrate directly to the leach showed 94.2 gold extraction with only 0.16kg/t NaCN consumption.

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  • The effect of grinding chemistry on cyanide leaching of

    Pyrrhotite was selected because this sulfide mineral is the highest cyanide‐ and oxygen- consuming iron sulfide and contrary to pyrite tends to behave as a reactive anode.

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  • for determining cyanide consumption in gold leaching

    The reason for the lower cyanide consumption obtained with intense aeration is probably connected with the reactions which take place when alkaline sulphide decomposes in cyanide solution. Alkaline sulphide is one of the initial products of the reaction between pyrrhotite and alkaline cyanide solution.

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  • Leachox TechnologyMaelgwyn

    Aachen Pre-oxidation to reduce cyanide consumption through oxidation of cyanide consuming species combined with efficient oxygen utilisation. Simple pre-oxidation designed to oxidise cyanide consumers to prevent excess reagent consumption may be more efficiently achieved using Aachen reactors where the oxygen mass requirements have been identified as relatively high.

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  • The effect of grinding chemistry on cyanide leaching of

    Pyrrhotite was selected because this sulfide mineral is the highest cyanide‐ and oxygen- consuming iron sulfide and contrary to pyrite tends to behave as a reactive anode.

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  • Cyanidation of gold ores c.pdfFree Download PDF Ebook

    Jun 16 2018 · Factors affecting gold leaching 2. 1999. gold dissolution kinetic studies were also successfully overcame the effect of pyrite and pyrrhotite on cyanide evaluated by using different oxidizing reagents which was not applied consumption and the gold leaching kinetics.2 extractions (50–80 ) within a conventional cyanide leaching process

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  • INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF

    the dissolution of metallic sulfides thus reduces cyanide consumption (Deschenes et al. 2003). Metallic sulfides such as pyrite chalcopyrite and pyrrhotite show different reaction mechanisms with lead nitrate. Lead nitrate passivizes the pyrite by forming a hydroxide (Pb(OH) 2

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  • Cyanide Leaching and Decomposition of Pyrrhotite

    Optimum results as regards gold extraction and cyanide consumption are obtained when using well aerated cyanide solutions containing at least 0.05 CaO and saturated with calcium sulphate. Laboratory results showing the cyanicidal effects of pyrrhotite under various conditions were given.

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  • INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF

    the dissolution of metallic sulfides thus reduces cyanide consumption (Deschenes et al. 2003). Metallic sulfides such as pyrite chalcopyrite and pyrrhotite show different reaction mechanisms with lead nitrate. Lead nitrate passivizes the pyrite by forming a hydroxide (Pb(OH) 2

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  • Lime in Gold Ore Mining Process Flotation Cyanidation

    Aug 03 2019 · Generally speaking for the gold concentrate zinc powder replacement cyanide plant the CaO concentration in the noble liquid is controlled between 3 and 8/10 000 in actual production which can meet the service life of the replacement "golden cabinet" and guarantee Zinc powder consumption and gold replacement rate ensure the quality of

    Get Price
  • Improved leach recoveryIsaMill™ Advantages Isamill

    The preaeration stage removes small quantities of active pyrite and pyrrhotite prior to cyanidation. Pre-aeration increases the Eh and oxidises the active pyrite and pyrrhotite to reduce cyanide consumption in the leach process. This is different from the patented Albion Process where significant portions of sulphides (over 10 ) are oxidised

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  • Evaluation of Refractory Behaviour of Kaletaş (Turkey

    leaching period and the consumption of cyanide was recorded. Roasting of the ore samples (1 h) in 250 g batches were carried out in a furnace set to the predetermined temperature. The calcines produced at different temperatures ( °C) were subjected to cyanide leaching. The experimental conditions for cyanide leaching and flotation tests

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  • 10.1016/SX(03) DeepDyve

    Jun 11 2020 · The ore without pre-oxidation consumes cyanide and oxygen according to the following equation (7) 2 FeS ( s ) 2 NaCN 3 H 2 O 1.5 O 2 =2 Fe(OH) 3( s ) 2 NaSCN and this explains the low gold extraction and high cyanide consumption in Test LT7 compared to LT8 (Table 4) .

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  • Procedure for processing sulphide gold containing arsenic

    Said invention also consists in reducing the specific consumption of highly toxic sodium cyanide by reducing the concentration of blocker gold arsenic antimony and increasing the degree of opening of the gold particles in the pyrrhotite stubs which reduces operating costs for reagents and materials on the operations of the gold extraction

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  • AU697526B2Regeneration of cyanide by oxidation of

    AU697526B2 AU28367/95A AUA AU697526B2 AU 697526 B2 AU697526 B2 AU 697526B2 AU 28367/95 A AU28367/95 A AU 28367/95A AU A AU A AU A AU 697526 B2 AU697526 B2 AU 697526B2 Authority AU Australia Prior art keywords method thiocyanate ph cyanide contacting Prior art date Legal status (The legal status is an assumption and is not a legal

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  • Gold with Pyrite Pyrrhotite Marcasite and Arsenopyrite

    Apr 17 2016 · ) Sulfides tend to decompose in cyanide solutions. Pyrite is the most stable but when pyrrhotite is present trouble is usually experienced both in regard to cyanide consumption and gold extraction. Pyritic flotation concentrates are often reground for gold liberation before cyanidation as at Itogon-Suyoc Itogon and Pamour.

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  • The Influence of a Pipe Reactor to Improve Pre-Oxidation

    The general experience in gold cyanidation research activities and plant practice is that high oxygen and cyanide concentrations improve gold leaching kinetics which in turn reduce residence time and increase throughput. This paper shows how the improved pre-oxidation method for the pyrrhotite rich gold ore of Bounty Gold Mine has increased gold recoveries at lower

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  • Improved leach recoveryIsaMill™ Advantages Isamill

    The preaeration stage removes small quantities of active pyrite and pyrrhotite prior to cyanidation. Pre-aeration increases the Eh and oxidises the active pyrite and pyrrhotite to reduce cyanide consumption in the leach process. This is different from the patented Albion Process where significant portions of sulphides (over 10 ) are oxidised

    Get Price
  • ALTA Gold 2012 E-DocHome Albion Process

    recoveries. Cyanide consumption ranged from 1.6 to 2.2 kg/t whereas lime ranged from 2.5 to 3.2 kg/t. Cyanidation of the tails recovered 50 Au and 40 Ag with Sodium cyanide and lime consumption 0.7 kg/t and 1.5 kg/t respectively. In all cases the gold and silver leaching kinetics

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  • Cyanidation of a pyrrhotite-bearing gold ore

    The pyrrhotite was determined to be 50 monoclinic and 50 hexagonal. A leach using 8ppm dissolved oxygen yielded only 82.3 gold extraction with a 0.29kg/t NaCN consumed. The addition of lead nitrate directly to the leach showed 94.2 gold extraction with only 0.16kg/t NaCN consumption.

    Get Price
  • The effect of grinding chemistry on cyanide leaching of

    Pyrrhotite was selected because this sulfide mineral is the highest cyanide‐ and oxygen- consuming iron sulfide and contrary to pyrite tends to behave as a reactive anode.

    Get Price
  • Procedure for processing sulphide gold containing arsenic

    Said invention also consists in reducing the specific consumption of highly toxic sodium cyanide by reducing the concentration of blocker gold arsenic antimony and increasing the degree of opening of the gold particles in the pyrrhotite stubs which reduces operating costs for reagents and materials on the operations of the gold extraction

    Get Price
  • Cyanidation of a pyrrhotite-bearing gold ore911

    A study on hexagonal pyrrhotite indicated a very low solubility in aerated cyanide solutions (Linge 1995). The transformation of pyrite to pyrrhotite using pyrolysis indicated that the cyanide consumption gradually decreases with an increase in the pyrrhotite content of

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  • Assessing a two-stage heap leaching process for Platreef

    a second stage leach using cyanide solution achieving extractions of up to 96.5 Pd this stage is required to reduce the consumption of cyanide by the copper and nickel. while pyrrhotite was associated with silicate gangue pentlandite and

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