pyrrhotite cyanide consumption

pyrrhotite cyanide consumption

How is Sodium Cyanide Consumed during Gold Cyanidation

The formula is as follows: 2Au+4NaCN+O2+2H2O→2Na [Au (CN)2]+2NaOH+H2O2. 2Au+4NaCN+H2O2→2Na [Au (CN)2]+2NaOH. From the electrochemical reaction, it can be known that dissolving 1 gram of gold consumes 0.92 grams of sodium cyanide.

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COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING FOR GOLD

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.

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Army boss’ cattle succumb to cyanide from police-run mine

Feb 02,  · The cyanide dam which burst had an estimated 25litres. Muzvidziwa’s 41 cattle were driven to the paddocks at around 6am on January 21, and a herd boy saw the cattle drinking from pools near the mine and the beasts started dying immediately, said a source.

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Emerging technologies in cyanidation of gold and silver: a

improved cyanide consumption, leaching kinetics as well as overall gold extraction. Pretreatment with lead nitrate and low DO produced fast leaching kinetics, low cyanide consumption and high extraction of gold for the Eleonore pyrrhotite concentrate. Aurostibite, a gold antimony mineral (AuSb 2), converts to

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Environmental & 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

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The reasons of gold refractory, Gold ore classification, and

Nov 28, · The side effect of Oxygen and cyanide consumption minerals. using alkaline air oxidation method is easier to complete alkaline pre-oxidation for pyrrhotite, so makes gold easier to cyanide and

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Effect of pyrrhotite reactivity on cyanidation of

Abstract. The effect of the metal to sulphur ratio in the nonstoichiometic compound, pyrrhotite, is related to the consumption of cyanide in gold leaching. Reactive pyrrhotite (Fe (I-X) S) is produced during the pyrolysis of refractory pyrite (FeS 2 ). Iron vacancies give pyrrhotite its non stoichiometric nature and determine its fugacity and hence reactivity.

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The BIOX™ Process for the Treatment of Refractory Gold

Broadhurst JL (1996) Cyanidation of BIOX ™ products arising from pyrite/arsenopyrite/ pyrrhotite concentrates: a compilation of testwork results relating to cyanide consumption. Gencor Process Research, report no PR96/53.

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INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF GOLD AND

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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The effect of grinding chemistry on cyanide leaching of

A synthetic ore was prepared by mixing pyrrhotite with gravity gold concentrate and quartz. Pyrrhotite is of interest to grinding and leaching chemistry 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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Allied Nevada Initiates Milling and Oxidation Pilot Plant

East Driefontein in South Africa used AAO to oxidize minor amounts of pyrrhotite before cyanidation to reduce cyanide consumption. Lime was used to control the pH at 10.5-11, as they were

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Cyanidation of a pyrrhotite-bearing gold ore

In spite of the low consumption of cyanide observed in the laboratory experiments (i.e., 0.19kg/t vs. 0.35kg/t in the plant), the laboratory study indicated a cyanide consumption in the same range for the ores containing 7% pyrrhotite and 3.7% pyrrhotite (0.17-0.18kg/t NaCN) (Deschênes et al., 1999).

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US5482694A - Regeneration of cyanide by oxidation of

Provided is a method for regenerating cyanide from thiocyanate. The method comprises contacting the thiocyanate with an oxidizing gas containing ozone, generally a mixture of oxygen and ozone. The pH of the contacting medium is generally less than 7.0 to assure that HCN is the predominant species relative to CN - . The method has important applications to processes involving cyanidation

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Cyanide poisoning - Wikipedia

Cyanide poisoning is poisoning that results from exposure to any of a number of forms of cyanide. Early symptoms include headache, dizziness, fast heart rate, shortness of breath, and vomiting. This phase may then be followed by seizures, slow heart rate, low blood pressure, loss of consciousness, and cardiac arrest. Onset of symptoms usually occurs within a few minutes.

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Assessment of Process Operations and Waste Control

The relatively high pyrrhotite (Fe 5 5 5 to Fe 16 S 17 ) and ferrous iron content of this ore would normally indicate difficulties in direct cyanide extraction of gold. During the 1940's, Homestake was recovering silver in addition to gold. the total cyanide consumption will average about 1.5 lb. MaCN per ton of ore. Although this cyanide

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4 Reasons and Solutions of Poor Gold Leaching Effect

Reason#1: There are a lot of pyrite, pyrrhotite and marcasite in gold ore. These minerals are associated minerals that consume oxygen, alkali and cyanide. In the cyanidation process, they are easily oxidized and decomposed to produce sulfuric acid, ferrous sulfate, ferric subsulfate, ferric thiosulfate, etc.

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Pyrrhotite - Wikipedia

What does pyrrhotite mean?

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Kibali Gold Mine sulphide concentrate treatment

cyanide consumption; and (iv) stage dissolution or residue values achieved. Lime and cyanide consump- the ore body with a predominantly pyrrhotite min-eralisation. Cyanide and lime consumption are reported in kg/t of concentrate with typicalflotation mass pulls of between 10 and 11%. Under these

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PDF Cyanidation of a pyrrhotite-bearing gold ore

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 the sample (Browner and Lee, 1998). This

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The interaction of cyanide with pyrite, marcasite and

The interaction of cyanide with pyrite, marcasite and pyrrhotite Cuihua Zhaoa, Dewei Huanga, Jianhua Chenb,⇑, Yuqiong Lib, Ye Chenb, Weizhou Lia a College of Material Science and Engineering, Guangxi University, Nanning 530004, China bGuangxi Colleges and University Key Laboratory of Minerals Engineering, Guangxi University, Nanning 530004, China

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PDF Influence of Pre-aeration on Cyanide Leaching of A Non

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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