pyrrhotite cyanide consumption
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Improved leach recovery IsaMill™ Advantages Isamill
The preaeration stage removes small quantities of active pyrite and pyrrhotite prior to cyanidation. Preaeration increases the Eh and oxidises the active pyrite and pyrrhotite to reduce cyanide consumption in the leach process.
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pyrites and pyrrhotite and the gold is encapsulated within the crystal structure of these . The reduction in acid content reduces the lime consumption at the CIL and the reduction in iron and arsenic reduces cyanide consumption. Incorporated in the CCD circuit is a
Get priceThe effect of sulfide minerals on the leaching of gold in
It was reported that preleaching successfully overcame the effect of pyrite and pyrrhotite on cyanide consumption and the gold leaching kinetics, but it had no beneficial effect when chalcopyrite was present. It was suggested that lead nitrate prevented copper and iron dissolution by forming a passive layer at the surface of sulfide minerals.
Get priceUS5482694A Regeneration of cyanide by oxidation of
To regenerate cyanide from thiocyanate in accordance with the present invention requires less oxidizing agent than straight thiocyanate destruction. Moreover, the ability to regenerate cyanide greatly reduces the overall cyanide consumption. Problems with industrial effluents, however, can occur due to the presence of copper.
Get priceINFLUENCE 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
Get priceThe Leaching and Oxidation of Sulfide Minerals in Cyanide
The leaching of copper from a pyrite concentrate sample is shown to be rapid, and accompanied by significant iron dissolution however, the iron is not believed to be from pyrite, pyrrhotite or chalcopyrite. The rate of iron leaching and cyanide consumption is reduced by maintaining low cyanide and high oxygen concentrations.
Get priceINFLUENCE OF PREAERATION 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
Get pricegold flotation help : mining reddit
gold flotation help (self.mining) It is pretty unusual to have a sulphide gold float that is not refractory, but I will warn you that with pyrite, pyrrhotite and the copper minerals present your cyanide consumption is going to be high. These base metals are going to eat up cyanide and form WAD species, so instead of designing for a nice
Get priceUS5587001A Process for treating ironcontaining sulfidic
A process is provided for pretreating ironcontaining sulfidic ores of precious metals or other such sulfidic rocks with a source of manganate ions prior to lixiviation to form a layer of manganese oxide, thereby reducing the consumption of lixiviation reagents or reducing acid rock drainage.
Get priceUS Patent for Cyanideleaching process Patent (Patent
Nov 03, 2014 · Justia Patents With A Cyanide Compound US Patent for Cyanideleaching process Patent (Patent # 9,404,168 The formation of thiocyanates is also known to cause an increase in cyanide consumption and, thus in process costs. "The effects of dissolved oxygen and cyanide dosage on gold extraction from a pyrrhotiterich ore
Get pricegold refractory,ore classifiion,preprocessing methods
They have a high solubility in the alkaline cyanide, have a large amount consumption of cyanide and dissolved oxygen in the solution, forming a variety of cyanide complex compound and SCN,therefore, it affects the oxidation and the leaching of gold. The most important oxygen consumption minerals in the ore are pyrrhotite, marcasite, arsenopyrite.
Get pricecyanidation of gold nagelsalonartcreatives.nl
Gold cyanidation, also called cyanide leaching, is a process used to extract gold from raw ore taken from the ground. It uses cyanide to dissolve the gold within the rock, which, itself, is not soluble in cyanide. The gold is then drawn out in a liquid form that can be treated to remove the cyanide. read more
Get priceThe Metallurgy of Cyanide Gold Leaching – An Introduction
Oct 20, 2014 · The Metallurgy of Cyanide Gold Leaching – An Introduction. The Metallurgy of Cyanide Gold Leaching – An Introduction. The Metallurgy of Cyanide Gold Leaching – An Introduction These reactions must be carefully managed and where possible suppressed to prevent excess cyanide consumption causing the process to become uneconomic.
Get priceGold Metallurgy & Leaching in Cyanicides
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.
Get priceTHE INFLUENCE OF PREAERATION ON CYANIDE LEACHING
The equations related to cyanide consumption and passivation of gold with sulphide is as follows (Deschenes, 2005): minerals like pyrrhotite. In another study, Jeffrey and Breuer (2000) investigated the effect of sulphur species using gold containing 5% silver instead of high purity gold.
Get priceGold and silver metallurgist Home
(Pyrite is found to some degree in most of the world''s gold deposits. ) 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.
Get pricepyrrhotite cyanide consumption lkcsonnenborgh.nl
pyrrhotite cyanide consumption Patentti US9346062 Separation of copper minerals from . molybdenum and gold from pyrite, marcasite, pyrrhotite, arsenopyrite, and other gangue minerals following aerating by an oxidizing gas and contacting by a.,
Get priceINFLUENCE 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 pyrite by forming a hydroxide (Pb(OH) 2) layer on pyrite surface reducing the dissolution of pyrite
Get pricePRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE
PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE METATES GOLD PROJECT EXPERIENCE . By . 1Gary Parkison, 2Art Ibrado, 3Grenvil Dunn, 3Nelson Mora and 3Yong Yong Teo . 1Chesapeake Gold Corp., Canada . 2M3 Engineering and Technology, USA . 3. Orway Mineral Consultants (WA) Pty Ltd, Australia . Corresponding Author
Get priceINFLUENCE OF PREAERATION 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
Get priceINFLUENCE 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 pyrite by forming a hydroxide (Pb(OH) 2) layer on pyrite surface reducing the dissolution of pyrite
Get priceThe reasons of gold refractory, Gold ore classifiion
Nov 28, 2016 · The reasons of gold refractory, Gold ore classifiion, and preprocessing methods. Published on November 28, 2016 November 28, 2016 • 59 Likes • 9 Comments
Get priceThe influence of pyrite preoxidation on gold DeepDyve
Jul 01, 2006 · The influence of pyrite preoxidation in alkaline solutions on gold recovery by cyanidation from Twin Creek refractory gold ore in which pyrite was identified as the major sulfide mineral has been investigated with the aid of electrochemical measurements, leaching experiments, and direct analysis of reaction products for selected residues.
Get priceCyanidation of a pyrrhotitebearing gold ore 911
A study on hexagonal pyrrhotite indied a very low solubility in aerated cyanide solutions (Linge, 1995). The transformation of pyrite to pyrrhotite, using pyrolysis, indied that the cyanide consumption gradually decreases with an increase in the pyrrhotite content of
Get priceALTA Gold 2012 EDoc albionprocess.com
pyrrhotite, covellite, arsenides, and antimonite To render gold ''locked'' in the sulphide mineral amenable to cyanidation a chemical pretreatment is required. No matter what process option is used it generally involves the oxidation of sulphide Cyanide consumption ranged from 1.6 to 2.2 kg/t whereas lime ranged from 2.5 to 3.2 kg/t
Get priceImproved leach recovery IsaMill™ Advantages Isamill
The preaeration stage removes small quantities of active pyrite and pyrrhotite prior to cyanidation. Preaeration increases the Eh and oxidises the active pyrite and pyrrhotite to reduce cyanide consumption in the leach process.
Get priceThe reasons of gold refractory, Gold ore classifiion
Nov 28, 2016 · The reasons of gold refractory, Gold ore classifiion, and preprocessing methods. Published on November 28, 2016 November 28, 2016 • 59 Likes • 9 Comments
Get priceProcess Parameters for Biooxidation of Sulphur in the Pre
problems by increasing cyanide consumption and decreasing the environmental quality of the residue. In this research Index Terms—bacterial sulphur oxidation, bioleach residues, mesophiles, moderate thermophiles I. oxidation of pyrrhotite as shown the following equation:
Get priceDesign of a Leaching Strategy to Extract Gold from
cyanide consumption to 6.0 kg/t with a gold extraction of 97.5 per cent. Increasing the lead nitrate addition to 6.0 kg/t reduced the cyanide consumption to 1.2 kg/t by passivating the surface of pyrrhotite. The gold extraction remained at 97.0 per cent. It
Get priceEnvironmental & Health Effects International Cyanide
This document is a general summary of cyanide''s effects on human health and the environment, and is not intended to be a complete reference on all the environmental and health effects of cyanide. Human Health Effects Cyanide is produced in the human body and exhaled in extremely low concentrations with each breath. It is also produced by over 1,000 plant species including sorghum, bamboo and
Get priceChapter 1 INTRODUCTION UPSpace
Chapter 1 INTRODUCTION. 1.1 Introduction . Pyrrhotite Fe(1x)S is one of the most commonly occurring metal sulfide minerals and is recognised in a variety of ore deposits including nickelcopper, leadzinc, and platinum group element (PGE).
Get priceAllied Nevada progresses with Ambient Pressure Alkaline
Allied Nevada progresses with Ambient Pressure Alkaline Oxidation. East Driefontein in South Africa used AAO to oxidise minor amounts of pyrrhotite before cyanidation to reduce cyanide consumption. Lime was used to control the pH at 10.511, as they were interested in passivating the sulphide surfaces, not oxidising a large fraction of the
Get priceSodium Metabisulphite Supplier Kemcore
Cyanide detoxifiion in gold mining Sodium metabisulphite precipitate gold from gold dissolved in aqua regia (auric acid). It is also used as a source of sulphur dioxide, mixed with air or oxygen for the destruction of cyanide in commercial gold cyanidation process. This makes it a suitable alternative to ferrous sulphate heptahydrate.
Get priceEffect of the composition of some sulphide DeepDyve
With regard to the synthetic ores, it was found that pyrrhotite did not generate a high cyanide consumption while pyrite and chalcopyrite were detrimental. Preleaching was deleterious for the ore containing chalcopyrite while preleaching with lead nitrate was very efficient to decrease the reactivity of the ore containing pyrite.
Get priceMajor Mines & Projects Blackwater Project
Cyanidebearing liquid overflow recovered from the thickener will be recycled back to the process to lower the cyanide consumption as well as cyanide destruction costs. Slurry will be thickened to 60% solids in a tailings thickener before being introduced into the cyanide destruction circuit.
Get priceImproved leach recovery IsaMill™ Advantages Isamill
The preaeration stage removes small quantities of active pyrite and pyrrhotite prior to cyanidation. Preaeration increases the Eh and oxidises the active pyrite and pyrrhotite to reduce cyanide consumption in the leach process.
Get priceINTERNATIONAL CYANIDE MANAGEMENT INSTITUTE
pyrites and pyrrhotite and the gold is encapsulated within the crystal structure of these . The reduction in acid content reduces the lime consumption at the CIL and the reduction in iron and arsenic reduces cyanide consumption. Incorporated in the CCD circuit is a
Get priceThe effect of sulfide minerals on the leaching of gold in
It was reported that preleaching successfully overcame the effect of pyrite and pyrrhotite on cyanide consumption and the gold leaching kinetics, but it had no beneficial effect when chalcopyrite was present. It was suggested that lead nitrate prevented copper and iron dissolution by forming a passive layer at the surface of sulfide minerals.
Get priceUS5482694A Regeneration of cyanide by oxidation of
To regenerate cyanide from thiocyanate in accordance with the present invention requires less oxidizing agent than straight thiocyanate destruction. Moreover, the ability to regenerate cyanide greatly reduces the overall cyanide consumption. Problems with industrial effluents, however, can occur due to the presence of copper.
Get priceINFLUENCE 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
Get priceThe Leaching and Oxidation of Sulfide Minerals in Cyanide
The leaching of copper from a pyrite concentrate sample is shown to be rapid, and accompanied by significant iron dissolution however, the iron is not believed to be from pyrite, pyrrhotite or chalcopyrite. The rate of iron leaching and cyanide consumption is reduced by maintaining low cyanide and high oxygen concentrations.
Get priceINFLUENCE OF PREAERATION 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
Get pricegold flotation help : mining reddit
gold flotation help (self.mining) It is pretty unusual to have a sulphide gold float that is not refractory, but I will warn you that with pyrite, pyrrhotite and the copper minerals present your cyanide consumption is going to be high. These base metals are going to eat up cyanide and form WAD species, so instead of designing for a nice
Get priceUS5587001A Process for treating ironcontaining sulfidic
A process is provided for pretreating ironcontaining sulfidic ores of precious metals or other such sulfidic rocks with a source of manganate ions prior to lixiviation to form a layer of manganese oxide, thereby reducing the consumption of lixiviation reagents or reducing acid rock drainage.
Get priceUS Patent for Cyanideleaching process Patent (Patent
Nov 03, 2014 · Justia Patents With A Cyanide Compound US Patent for Cyanideleaching process Patent (Patent # 9,404,168 The formation of thiocyanates is also known to cause an increase in cyanide consumption and, thus in process costs. "The effects of dissolved oxygen and cyanide dosage on gold extraction from a pyrrhotiterich ore
Get pricegold refractory,ore classifiion,preprocessing methods
They have a high solubility in the alkaline cyanide, have a large amount consumption of cyanide and dissolved oxygen in the solution, forming a variety of cyanide complex compound and SCN,therefore, it affects the oxidation and the leaching of gold. The most important oxygen consumption minerals in the ore are pyrrhotite, marcasite, arsenopyrite.
Get pricecyanidation of gold nagelsalonartcreatives
Gold cyanidation, also called cyanide leaching, is a process used to extract gold from raw ore taken from the ground. It uses cyanide to dissolve the gold within the rock, which, itself, is not soluble in cyanide. The gold is then drawn out in a liquid form that can be treated to remove the cyanide. read more
Get priceThe Metallurgy of Cyanide Gold Leaching – An Introduction
Oct 20, 2014 · The Metallurgy of Cyanide Gold Leaching – An Introduction. The Metallurgy of Cyanide Gold Leaching – An Introduction. The Metallurgy of Cyanide Gold Leaching – An Introduction These reactions must be carefully managed and where possible suppressed to prevent excess cyanide consumption causing the process to become uneconomic.
Get priceGold Metallurgy & Leaching in Cyanicides
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.
Get priceTHE INFLUENCE OF PREAERATION ON CYANIDE LEACHING
The equations related to cyanide consumption and passivation of gold with sulphide is as follows (Deschenes, 2005): minerals like pyrrhotite. In another study, Jeffrey and Breuer (2000) investigated the effect of sulphur species using gold containing 5% silver instead of high purity gold.
Get priceGold and silver metallurgist Home
(Pyrite is found to some degree in most of the world''s gold deposits. ) 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.
Get pricepyrrhotite cyanide consumption lkcsonnenborgh
pyrrhotite cyanide consumption Patentti US9346062 Separation of copper minerals from . molybdenum and gold from pyrite, marcasite, pyrrhotite, arsenopyrite, and other gangue minerals following aerating by an oxidizing gas and contacting by a.,
Get priceINFLUENCE 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 pyrite by forming a hydroxide (Pb(OH) 2) layer on pyrite surface reducing the dissolution of pyrite
Get pricePRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE
PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE METATES GOLD PROJECT EXPERIENCE . By . 1Gary Parkison, 2Art Ibrado, 3Grenvil Dunn, 3Nelson Mora and 3Yong Yong Teo . 1Chesapeake Gold Corp., Canada . 2M3 Engineering and Technology, USA . 3. Orway Mineral Consultants (WA) Pty Ltd, Australia . Corresponding Author
Get priceINFLUENCE OF PREAERATION 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
Get priceINFLUENCE 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 pyrite by forming a hydroxide (Pb(OH) 2) layer on pyrite surface reducing the dissolution of pyrite
Get priceThe reasons of gold refractory, Gold ore classifiion
Nov 28, 2016 · The reasons of gold refractory, Gold ore classifiion, and preprocessing methods. Published on November 28, 2016 November 28, 2016 • 59 Likes • 9 Comments
Get priceThe influence of pyrite preoxidation on gold DeepDyve
Jul 01, 2006 · The influence of pyrite preoxidation in alkaline solutions on gold recovery by cyanidation from Twin Creek refractory gold ore in which pyrite was identified as the major sulfide mineral has been investigated with the aid of electrochemical measurements, leaching experiments, and direct analysis of reaction products for selected residues.
Get priceCyanidation of a pyrrhotitebearing gold ore 911
A study on hexagonal pyrrhotite indied a very low solubility in aerated cyanide solutions (Linge, 1995). The transformation of pyrite to pyrrhotite, using pyrolysis, indied that the cyanide consumption gradually decreases with an increase in the pyrrhotite content of
Get priceALTA Gold 2012 EDoc albionprocess
pyrrhotite, covellite, arsenides, and antimonite To render gold ''locked'' in the sulphide mineral amenable to cyanidation a chemical pretreatment is required. No matter what process option is used it generally involves the oxidation of sulphide Cyanide consumption ranged from 1.6 to 2.2 kg/t whereas lime ranged from 2.5 to 3.2 kg/t
Get priceImproved leach recovery IsaMill™ Advantages Isamill
The preaeration stage removes small quantities of active pyrite and pyrrhotite prior to cyanidation. Preaeration increases the Eh and oxidises the active pyrite and pyrrhotite to reduce cyanide consumption in the leach process.
Get priceThe reasons of gold refractory, Gold ore classifiion
Nov 28, 2016 · The reasons of gold refractory, Gold ore classifiion, and preprocessing methods. Published on November 28, 2016 November 28, 2016 • 59 Likes • 9 Comments
Get priceProcess Parameters for Biooxidation of Sulphur in the Pre
problems by increasing cyanide consumption and decreasing the environmental quality of the residue. In this research Index Terms—bacterial sulphur oxidation, bioleach residues, mesophiles, moderate thermophiles I. oxidation of pyrrhotite as shown the following equation:
Get priceDesign of a Leaching Strategy to Extract Gold from
cyanide consumption to 6.0 kg/t with a gold extraction of 97.5 per cent. Increasing the lead nitrate addition to 6.0 kg/t reduced the cyanide consumption to 1.2 kg/t by passivating the surface of pyrrhotite. The gold extraction remained at 97.0 per cent. It
Get priceEnvironmental & Health Effects International Cyanide
This document is a general summary of cyanide''s effects on human health and the environment, and is not intended to be a complete reference on all the environmental and health effects of cyanide. Human Health Effects Cyanide is produced in the human body and exhaled in extremely low concentrations with each breath. It is also produced by over 1,000 plant species including sorghum, bamboo and
Get priceChapter 1 INTRODUCTION UPSpace
Chapter 1 INTRODUCTION. 1.1 Introduction . Pyrrhotite Fe(1x)S is one of the most commonly occurring metal sulfide minerals and is recognised in a variety of ore deposits including nickelcopper, leadzinc, and platinum group element (PGE).
Get priceAllied Nevada progresses with Ambient Pressure Alkaline
Allied Nevada progresses with Ambient Pressure Alkaline Oxidation. East Driefontein in South Africa used AAO to oxidise minor amounts of pyrrhotite before cyanidation to reduce cyanide consumption. Lime was used to control the pH at 10.511, as they were interested in passivating the sulphide surfaces, not oxidising a large fraction of the
Get priceSodium Metabisulphite Supplier Kemcore
Cyanide detoxifiion in gold mining Sodium metabisulphite precipitate gold from gold dissolved in aqua regia (auric acid). It is also used as a source of sulphur dioxide, mixed with air or oxygen for the destruction of cyanide in commercial gold cyanidation process. This makes it a suitable alternative to ferrous sulphate heptahydrate.
Get priceEffect of the composition of some sulphide DeepDyve
With regard to the synthetic ores, it was found that pyrrhotite did not generate a high cyanide consumption while pyrite and chalcopyrite were detrimental. Preleaching was deleterious for the ore containing chalcopyrite while preleaching with lead nitrate was very efficient to decrease the reactivity of the ore containing pyrite.
Get priceMajor Mines & Projects Blackwater Project
Cyanidebearing liquid overflow recovered from the thickener will be recycled back to the process to lower the cyanide consumption as well as cyanide destruction costs. Slurry will be thickened to 60% solids in a tailings thickener before being introduced into the cyanide destruction circuit.
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- coal mobile crusher 400 tph electricity consumption per hour
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