pyrrhotite cyanide consumption

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, .gold refractory,ore classification,preprocessing methodsThey 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.

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gold flotation help : mining - reddit

The ore consists of a stockwork of Gold-bearing tourmaline-pyrrhotite-aresneopyrite veinlets and disseminations in the rock, contained within alteration zones of quartz-carbonate-tourmaline-arsneopyrite-pyrrhotite. ... pyrrhotite and the copper minerals present your cyanide consumption is going to be high. These base metals are going to eat up ...[PDF] 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.Cyanidation of gold ores c.pdf - Free Download PDF EbookJun 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 ...AU697526B2 - Regeneration 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 .Cyanidation of gold ores c.pdf - Free Download PDF EbookJun 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 ...Cyanidation of a pyrrhotite-bearing gold oreA 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 .Rcovery of gold in pyritic ores - Mine Engineer.ComUsing cyanide to recover gold from sulfide ores generally results in 30 to 35% recovery, and the best I have heard of is around 50% recovery. The fine coating of a iron compound definitely appears to be a key component of the inability of cyanide to efficiently leach low grade pyritic ores.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...

(PDF) Cyanidation of a pyrrhotite-bearing gold ore

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 ...cyanidation of a pyrrhotite bea gold oreAn EXAMPLE ore deposit is know for its gold bearing pyrite concentrate containing pyrrhotite and chalcopyrite is preaerated in a high lime solution ahead of cyanidation Optimum results as regards gold extraction and cyanide consumption are obtained when using well aerated cyanide solutions containing at least 005 CaO and saturated with . Online ...ALTA Gold 2012 ProceedingsCyanide Detoxification of Cyanidation Tails and Process Streams ... Chalcopyrite and pyrrhotite were found to contribute directly to the formation of thiocyanate. The importance of monitoring impurity element ... are increased cyanide and lime consumption and decreased dissolution rates for gold and silver.Leaching of the arsenopyrite/pyrite flotation concentrates ...pyrrhotite and elemental iron. Czevanyak (1994) in discussing the work of Peters and Majima (1968) reported that hydrogen sulphide evolution always occurred after hydrogen evolution has already started. This scenario clearly indicates that the process efficiency of reductive decomposition will be adversely affected by any pH reduction.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

ALTA Gold 2012 E-Doc - Home | 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 kineticsUltrafine Grinding - an overview | ScienceDirect TopicsIt was found that increasing the lead nitrate addition from 1.0 kg/t to 6.0 kg/t in the pretreatment resulted in a decrease in the consumption of cyanide from 7.2 kg/t to 1.2 kg/t (Figure 26.17).At 6 kg/t lead nitrate, the pyrrhotite passivation reached a point where the oxygen consumed by the concentrate was significantly reduced.Cyanidation of a pyrrhotite-bearing gold oreA 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

Cyanide Leaching and Decomposition of Pyrrhotite

Research on cyanidation methods brought considerable discussion on the reactions involved in the leaching and decomposition of pyrrhotite in cyanide solutions. Pyrrhotite has one loosely held sulphur atom which readily reacts with cyanide to form thiocyanate: Fe5S6 + NaCN = NaCNS + 5 FeS The ferrous sulphide oxidizes rapidly to the sulphate which reacts with cyanide to form ferrocyanide: FeS ...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...How to Improve the Effect of Gold Cyanide Leaching? - XinhaiThe gold ore is 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 iron thiosulfate are generated. ... The gold ore contains the cyanide consumption ...Studying the Interactions of Mill Media and Recycled ...minerals (pyrrhotite, arsenopyrite and pyrite) with gravity gold concentrate, and quartz. 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. For pyrrhotite, the results showed that when the grinding of the ore

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.Rcovery of gold in pyritic ores - Mine Engineer.ComUsing cyanide to recover gold from sulfide ores generally results in 30 to 35% recovery, and the best I have heard of is around 50% recovery. The fine coating of a iron compound definitely appears to be a key component of the inability of cyanide to efficiently leach low grade pyritic ores.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 .Design 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 .Optimizing and evaluating the operational factors ...have concluded that using an excess of cyanide results in unnecessary cyanide consumption and has no beneficial effect on gold extraction . The excess cyanide will consume more cyanide because of the formation of cyanocomplexes from impurities. ... 2004 The effects of dissolved oxygen and cyanide dosage on gold extraction from a pyrrhotite-rich ...