pyrrhotite cyanide consumption

pyrrhotite cyanide consumption

Cyanide Leaching and Decomposition of Pyrrhotite

Leaching researchers describe cyanidation practice in treating a given pyrrhotitic gold ore with the following average chemical composition Au oz /ton Fe total 22% Fe ferrous 20% S total 5% S by evolution % CaO 6% MgO % As % Pyrrhotite is the most abundant mineral in the ore arsenopyrite is second and chalcopyrite is rare

Cyanide free separation of high pyrrhotite Zn S bulk concentrate

Meanwhile pyrrhotite is more susceptible and its recovery decreases sharply from % to % with the increase of depressant from 50 g/t to 150 g/t Download Download high res image 113KB Download Download full size image Fig 2 Effect of MOC dosage on the recovery of marmatite pyrite and pyrrhotite Batch flotation tests

The Metallurgy of Cyanide Gold Leaching An Introduction

Sulphide Minerals Some sulphide minerals pyrrhotite will oxidise during the leach and generate acid This reaction will consume the oxygen in solution and without this oxygen the reaction of Au and Cyanide cannot proceed regardless of the liberation of the gold

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The effects of dissolved oxygen and cyanide dosage on ResearchGate

The reduced cyanide consumption obtained in the cyanidation of the ozonized samples 10% less is due to the dissolution and elimination of the system of cyanide consuming species in

Cyanidation of a pyrrhotite bearing gold ore 1 pdf

Cyanidation of a pyrrhotite bearing gold ore 1 pdf See discussions stats and author profiles for this publication at

Mehdi Zolfaghari Process Engineer LinkedIn

The concentration of total selenium in discharge reach less than 10 µ 1 which respect the maximum allowable discharge of 20 µ 1 Decantation and dehydration of sludge is facilitate by the fact that its SVI was around 120 mL g 1 The energy consumption and electrode loss were around 66 Wh m 3 and 27 g m 3 respectively

US Patent Application for METHODS FOR SELECTIVE LEACHING AND EXTRACTION

The present application relates to methods for leaching and extraction of precious metals For example the present application relates to methods of leaching gold palladium and/or platinum from a substance comprising gold palladium and/or platinum such as a gold containing ore or a platinum group metal PGM concentrate using an organic solvent that is water miscible or partially water

The Influence of a Pipe Reactor to Improve Pre Oxidation and AusIMM

The improvement of the pre oxidation stage and lead nitrate solution addition has led to a reduction in the free cyanide concentration required for leaching resulting in a decrease in cyanide consumption rate by 36 per cent to achieve a one to two per cent improvement in the gold recovery Contributor s S Ellis J Andreazza G Senanayake

PDF Cyanidation of a pyrrhotite bearing gold ore ResearchGate

The pyrrhotite was determined to be 50% monoclinic and 50% hexagonal A leach using 8ppm dissolved oxygen yielded only % gold extraction with a /t NaCN consumed The addition of

How is Sodium Cyanide Consumed during Gold Cyanidation Process

From the electrochemical reaction it can be known that dissolving 1 gram of gold consumes grams of sodium 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

Reactions of gold and sulfide minerals in cyanide media

Abstract 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

PDF ERA MIN Research Agenda olivier vidal

The ERA MIN Research Agenda aims at listing the most important topics of research and innovation that will contribute to i secure the sustainable supply and management of non energy and non agricultural raw materials and ii offer opportunities of investment and employment opportunities in the EU

Influence of Crystal Field Stabilization Energy on Interaction of

Even with cyanide a strong field ligand the splitting energy of tetrahedral minerals is less than 200 kJ/mol which is smaller than the electron pairing energy of metal ions followed by marcasite and pyrite oxidizes most slowly Figure shows the oxygen consumption of marcasite pyrite and pyrrhotite As found in the figure

The effects of dissolved oxygen and cyanide dosage on gold extraction

This injection method operates very effectively and has lowered the cyanide consumption rate by 36% initially The processing plant consumes a total of 6 t of oxygen per day which is equivalent to kg of oxygen per tonne of dry ore A secondary cyanide dosing point is positioned in the preceding launder leading to tank 6

What Does Pyrrhotite Do To Concrete Surtreat Solutions

What Does Pyrrhotite Do in Concrete When pyrrhotite is present in concrete it can cause a lot of problems The first problem is when moisture damp air or water are exposed to the poured concrete that contains pyrrhotite When pyrrhotite is exposed to this moisture it expands within the concrete

Outbreak of Cyanide Poisoning Caused by Consumption of

Although the cyanogenic content of sweet cassava is substantially less than that of wild cultivars up to 100 ppm 1 the sweet cassava cultivars still require detoxification before they are consumed this involves peeling the tubers soaking them in water for 4 6 days and sun drying or roasting them

Composition of Pyrrhotite as an Indicator of Gold Ore Formation

The compositions Fe S close to Fe 7 S 8 Apy Po Rut Qz for which the estimated formation parameters are T = 486 465 °C and log f S2 = to are typical of early pyrrhotite in the form of microinclusions in arsenopyrite associated with rutile and quartz

Pyrrhotite Physical properties uses composition Geology

Pyrrhotite is an iron sulfide mineral found in igneous and metamorphic rocks Its chemical formula of Fe 1 x S indicates that it is deficient in iron which causes pyrrhotite to be slightly to strongly magnetic After magnetite pyrrhotite is the second most common magnetic mineral ADVERTISEMENT Table of Contents What Is Pyrrhotite

PDF The interaction of cyanide with pyrite marcasite and pyrrhotite

of CN on the pyrite marcasite and pyrrhotite surfaces Mulliken populations and DOS of the interaction between CN and the pyr ite marcasite and pyrrhotite surfaces were calculated using the ﬁrst principles density functional calculation package CASTEP Calculation of adsorption energy The adsorption energies of cyanide ions on sulphide

Gold Metallurgy Leaching in Cyanicides Mineral Processing Metallurgy

the cyanide consumption during continuous treatment was about 12 lb per ton of calcine after batch treatment was introduced it dropped to about 9 lb per ton and now by the use of super aeration which apparently converts part of the copper content to a form less soluble in cyanide solution the consumption has been reduced to around 6 lb …

A thermodynamic study of pyrite and pyrrhotite USGS

Abstract Through the use of the electrum tarnish method the following equation has been found to interrelate the composition of pyrrhotite fugacity of sulfur and temperature In this equation f s2 is the fugacity of sulfur relative to the ideal diatomic gas at 1 atm N is the mol fraction of FeS in pyrrhotite in the system FeS S 2 and T

Assessing Pyrrhotite in Concrete NIST

Pyrrhotite Fe1 xS where x = 0 is a common sulfide mineral exhibiting a brownish bronze color with a metallic luster Physical properties include a hardness of 4 on the Mohs scale a specific gravity ranging between and and is magnetic but with varying intensity depending upon the iron content

Pyrrhotite An Important Gangue and a Source for Environmental Pollution

In fact it causes numerous problems in flotation including intensive oxygen consumption which results in poor selectivity among sulphide minerals in the processing of complex sulphide ores Also because of its high sulphur content pyrrhotite is a major contributor to environmentally detrimental sulphur dioxide SO2 emissions from smelters

Bioprocessing of Refractory Gold Ores The BIOX MesoTHERM and ASTER

In book Biomining Technologies 88 Authors Jan Albert van Niekerk

Solving the pyrrhotite issue in Canada

The effects of pyrrhotite in concrete foundations Approximately 1 200 houses in the Trois Rivières region in Quebec have had demolished basements due to pyrrhotite with thousands more still to be tested The result is an estimated $400 million in damages in the region but this problem may not be limited to Quebec

Pyrrhotite Mineral Data

General Pyrrhotite Information Chemical Formula Fe 1 x S x= Composition Molecular Weight = gm Iron % Fe Sulfur % S % Empirical Formula Fe 2 S Environment Wide spread occurrences in igneous and metamorphic rocks IMA Status Valid Species Pre IMA 1835 Locality

Pyrrhotite Mineral Data

Physical Properties of Pyrrhotite Cleavage {0001} Imperfect {1120} Imperfect Color Bronze Bronze red Dark brown Density Average = Diaphaneity Opaque Fracture Uneven Flat surfaces not cleavage fractured in an uneven pattern Habit Massive Granular Common texture observed in granite and other igneous

Pyrrhotite and Crumbling Concrete ct

Pyrrhotite weathering in the presence of moisture and air produces secondary minerals that expand causing concrete to crack This compromises the structural integrity and accelerates degradation with the increased infiltration of water and air Crushed rock aggregate containing pyrrhotite is associated with a quarry in Willington Connecticut

Comparison of Cyanide and Thiosulphate Leaching For Gold Scribd

Effect of pH on cyanide consumption Ling et al 1996 In agitation leaching cyanide consumption typically varies for free milling ores from about to kg/t and if there are cyanide consuming minerals then cyanide consumption varies from about 1 to 2 kg/t In heap leaching cyanide consumption is lower than in agitation

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