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pyrrhotite cyanide consumption

Effect of pyrrhotite reactivity on cyanidation of ...

1998-9-1 · CONCLUSION Cyanide consumption decreased as the temperature of pyrrhotite formation increased. For partially converted samples, along the pyrite/pyrrhotite solvus, cyanide consumption was inversely related to the formation sulphur fugacity and the atomic percentage sulphur in the pyrrhotite.

Cyanide Leaching and Decomposition of Pyrrhotite

2015-10-14 · The consumption of lime was decreased from 3.0 to 2.0 lb/ton of ore and the consumption of cyanide from 1.55 to 0.55 lb. NaCN/ton of ore. At the

Cyanidation of a pyrrhotite-bearing gold ore

2015-12-27 · 1995). The transformation of pyrite to pyrrhotite, using pyrolysis, indicated that the cyanide consumption gradually decreases with an increase in the pyrrhotite content of the sample (Browner and Lee, 1998). This finding means that pyrrhotite is less reactive than pyrite in a cyanide solution. The reactivity of pyrrhotite * Corresponding author.

(PDF) Cyanidation of a pyrrhotite-bearing gold ore

The transformation of pyrite to pyrrhotite, us ing pyrolysis, indicated that the cyanide consumption gradually decreases with an increase in the pyrrhotit e

Pyrrhotite - an 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.

Effect of the composition of some sulphide minerals on ...

1998-11-1 · The cyanide consumption by the pyrite mixture (9.7% pyrite) was 7 times higher than for the pyrrhotite (1.23 kg/t vs. 0.17 kg/t). Chalcopyrite was the most soluble mineral with a cyanide consumption 10 times higher than pyrrhotite (1.81 kg/t vs. 0.17 kg/t). 4.2. Part 2: low sulphide bearing gold ore4.2.1. Pre-leaching

The effects of dissolved oxygen and cyanide dosage on

2004-2-1 · A high concentration of O 2 during pre-oxidation increases the %Au recovery and decreases the cyanide consumption (Haque, 1992). This was observed in the laboratory tests LT7–LT10 . The gold recovery with no pre-oxidation was as low as 79.1%. It increased to 90.2% due to pre-oxidation whilst the cyanide consumption dropped by 15.8%.

(PDF) Reactions of gold and sulfide minerals in cyanide

Cyanide consumption decreased slightly by approximately 8%. ... it was found that pyrrhotite did not generate a high cyanide consumption while pyrite and

How is Sodium Cyanide Consumed during Gold

2020-8-21 · 2.Cyanide Consumption in Reaction with Associated Base Metals (1) Some gold ores contain pyrite, pyrrhotite, magnetite, copper sulfide, sulfate ore, hydroxide, oxide and other associated minerals. In the crushing stage, iron powder will be produced, which will slowly react with sodium cyanide, increasing the consumption of cyanide.

COMPARISON OF CYANIDE AND THIOSULPHATE

2016-3-20 · Many gold ores contain pyrrhotite which is easily oxidized and thereby consumes oxygen from leach solution. Besides copper minerals and pyrrhotite, other minerals that consume cyanide, oxygen or lime are arsenopyrite, realgar, orpiment and stibnite. The two last ones are the most reactive and may cause considerable processing problems.

Cyanidation of a pyrrhotite-bearing gold ore

2015-12-27 · 1995). The transformation of pyrite to pyrrhotite, using pyrolysis, indicated that the cyanide consumption gradually decreases with an increase in the pyrrhotite content of the sample (Browner and Lee, 1998). This finding means that pyrrhotite is less reactive than pyrite in a cyanide solution. The reactivity of pyrrhotite * Corresponding author.

The effects of dissolved oxygen and cyanide dosage on

The cyanide consumption increases in the ground sample due to the increase in surface area that exposes more cyanide consuming species (Ellis et al., 2004). Figure 10

(PDF) Reactions of gold and sulfide minerals in cyanide

Cyanide consumption decreased slightly by approximately 8%. ... it was found that pyrrhotite did not generate a high cyanide consumption while pyrite and chalcopyrite were detrimental. Pre ...

COMPARISON OF CYANIDE AND THIOSULPHATE

2016-3-20 · Many gold ores contain pyrrhotite which is easily oxidized and thereby consumes oxygen from leach solution. Besides copper minerals and pyrrhotite, other minerals that consume cyanide, oxygen or lime are arsenopyrite, realgar, orpiment and stibnite. The two last ones are the most reactive and may cause considerable processing problems.

Process for treating iron-containing sulfidic rocks and ...

1995-4-28 · Demonstration of Retardation of Cyanide Consumption. Two 1.00-g samples of pyrrhotite (Chihuahua, Mexico, 100 mesh) were each added to 500 ml of 0.01% by weight aqueous KMnO 4 solution (0.00115 mole %) which had been adjusted to pH 10.0 with NaOH. The slurries so formed were gently agitated on a rocker plate for 27 hrs. after which the solids ...

The Leachox™ Refractory Gold Process – The Testing,

2019-5-14 · pyrrhotite and occurs in both the chemically bonded state and as micro or nano -size ... low cyanide consumption oxide ore it is of particular concern for many refractory processes due to the much higher cyanide additions required. Whilst careful control of cyanide addition linked

The interaction of cyanide with pyrite, marcasite and ...

The adsorption of cyanide ions (CN−) on pyrite, marcasite and pyrrhotite surfaces was studied using density functional theory. The depressing effects of

Minerals | Free Full-Text | Incorporation of ...

Cyanide consumption simulation plots based on modes of operation, relative ore proportions, and average consumption requirement for each ore type (Ore1 = 2.24 kg/t, Ore 2 = 1.75 kg/t). ( a ) Simulation trial using a TOSL of 4000 t and COSL of 3000 t, showing the constant cyanide dose adjustment as a function of the short time frames between ...

Reactions of gold and sulfide minerals in cyanide media ...

2002-11-1 · The effect of pyrite, pyrrhotite, chalcopyrite, realgar and arsenopyrite on gold dissolution in cyanide media was investigated. The cyanidation of synthetic gold ores in the presence of various concentrations of sulfides was studied under constant experimental conditions. A mineralogical analysis of the minerals was performed. The leaching kinetics were

Leachox Technology – Maelgwyn

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

Cyanidation of a pyrrhotite-bearing gold ore

2015-12-27 · 1995). The transformation of pyrite to pyrrhotite, using pyrolysis, indicated that the cyanide consumption gradually decreases with an increase in the pyrrhotite content of the sample (Browner and Lee, 1998). This finding means that pyrrhotite is less reactive than pyrite in a cyanide solution. The reactivity of pyrrhotite * Corresponding author.

COMPARISON OF CYANIDE AND THIOSULPHATE

2016-3-20 · Many gold ores contain pyrrhotite which is easily oxidized and thereby consumes oxygen from leach solution. Besides copper minerals and pyrrhotite, other minerals that consume cyanide, oxygen or lime are arsenopyrite, realgar, orpiment and stibnite. The two last ones are the most reactive and may cause considerable processing problems.

Process for treating iron-containing sulfidic rocks and ...

1995-4-28 · Demonstration of Retardation of Cyanide Consumption. Two 1.00-g samples of pyrrhotite (Chihuahua, Mexico, 100 mesh) were each added to 500 ml of 0.01% by weight aqueous KMnO 4 solution (0.00115 mole %) which had been adjusted to pH 10.0 with NaOH. The slurries so formed were gently agitated on a rocker plate for 27 hrs. after which the solids ...

Effect of pyrrhotite on gold leaching - CORE

Abstract. The recovery of gold from its ores by cyanide leaching has been practiced around the world for more than a century. One of the parameters that dictate the rate of gold leaching as well as the rate of reagent consumption (lime and cyanide) is

INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING

2013-11-22 · 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

INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING

2014-5-13 · 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 ...

The Leachox™ Refractory Gold Process – The Testing,

2019-5-14 · pyrrhotite and occurs in both the chemically bonded state and as micro or nano -size ... low cyanide consumption oxide ore it is of particular concern for many refractory processes due to the much higher cyanide additions required. Whilst careful control of cyanide addition linked

Effect of Oxidative Pretreatment and Lead Nitrate Addition ...

2019-11-1 · Cyanidation is the main process in gold leaching. There are several parameters that affect gold recovery and cyanide consumption. In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were investigated. Au recovery was

Geometallurgical Approach for Implications of Ore

2019-7-22 · The CLR is known for its high amenability to cyanide leaching while the VCR contains refractory minerals such as arsenides, pyrite and pyrrhotite (Gartz and Frimmel 1999). The BR is well known for its deleterious preg-robbing effect due to abundant carbonaceous matter (McLoughlin 2014). A geometallurgical comparison is significant for the ...

INVESTIGATION OF THE AMENABILITY OF A COPPER

2020-12-24 · cyanide solutions (Table 2) leading to high cyanide consumption and exorbitant reagent costs. When subjected to cyanide-deficient solutions, certain copper minerals (e.g., chalcopyrite) can also exhibit preg-borrowing peculiarities, which are reversible (Marsden and House, 2006). High cyanide consumption through the formation of