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lead nitrate gold cyanidation

Effect of lead nitrate on cyanidation of gold ores

Oct 01, 2000· Effect of lead nitrate on cyanidation of gold ores 1277 The second gold ore, with 2.7% pyrite and 3.0% arsenopyrite, requires a very short pre-leaching time (between two and six hours) and 25-50 g/t lead nitrate. Improvement of the leaching kinetics resulted in a 43% reduction of the retention time. As illustrated in Figure 14, 89% gold

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Effect of lead nitrate on cyanidation of gold ores

This paper discusses some of the latest efforts to improve the understanding of the use of lead nitrate in cyanidation. The study is based on an electrochemical approach to establish the nature of the mechanisms related to gold, a surface analysis study, using X-ray photoelectron spectroscopy (XPS), to determine the modifications on gold and sulphide minerals (pyrite, pyrrhotite and

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(PDF) Effect of lead nitrate on cyanidation of gold ores

The effect of lead nitrate addition on the cyanidation of gold ores has been studied (Sayiner, 2014) and it is believed that the catalytic activity of lead on anodic dissolution of gold consists

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US7025942B2 Control of lead nitrate addition in gold

A method for controlling the extraction of gold from a gold ore by the cyanidation process in which a leaching step including the addition of a lead compound, which is typically lead nitrate or other lead salt, is used. In order to maintain stable conditions in the leaching process, and to use the leaching reagents efficiently, an analysis step is used to monitor the concentration of

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INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF

Keywords: lead nitrate, gold, silver, cyanide leaching Introduction Extraction of gold from its ores by cyanide leaching has been the preferred method for more than a century because of its simplicity, cost efficiency and the high stability of cyanide. Dissolution of gold and silver in alkaline cyanide

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Effect of Lead Nitrate on Gold Leach Kinetics

Lead Nitrate addition in CIL operations and how the dosage of Pb Lead nitrate affects gold leaching kinetic rates. The main aim for adding lead nitrate is to help in Gold dissolution in CIL plants. Should the gold solid tails be the main aim for dosing lead nitrate in the treatment of slightly compl

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Advances in the Cyanidation of Gold ScienceDirect

Jan 01, 2016· Figure 26.14 illustrates cyanidation experiments conducted to demonstrate gold-leaching kinetics when lead nitrate is added during cyanidation (Deschênes et al., 2002b). The absence of lead nitrate is associated with a 12.1% reduction in gold extraction for the retention time of the leach circuit.

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Effect Of Lead Nitrate On Cyanidation Of Gold Or

lead nitrate leaching copper gold silver. silver cyanide leaching. influence of lead nitrate on cyanide leaching of increase in gold and silver recoveries between 0. 1.2% for gold and 3. 11.6% for silver at the end of 24 hours leaching by the addition of lead nitrate as 0. 0.5 kg/mg. nacn consumption decreased or did not change except for the

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Cyanidation of a pyrrhotite-bearing gold ore

The gold concentrations in solution were used to deduce the extraction kinetics plots. Lead nitrate was not added to the pre-leaching unless specified. The leach solution and wash solutions were titrated for free cyanide with silver nitrate and rhodamine as

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Effect of Lead Nitrate Concentration on Gold Leaching

How to effectively identify overdosing of lead nitrate [Pb(NO3)2] in gold cyanidation.I'm interested in optimizing the lead nitrate addition at a standard 4000 tpd gold mill using conventional cyanidation. We currently add -240g/t lead nitrate to try to maintain our 'reducing power' (ppm S

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(PDF) Effect of Lead Nitrate on Cyanidation of Antimonial

This paper deals with the effect of the addition of lead nitrate and ultra-fine grinding on the cyanidation of an antimonial refractory gold and silver ore. The results indicated that the recovery of gold was enhanced by 10%, but, silver extraction

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Advances in the Cyanidation of Gold ScienceDirect

Jan 01, 2016· Figure 26.1 shows a potential sweep when the gold electrode is in contact with lead sulfide in a cyanide solution. The lead sulfide accelerated the gold dissolution rate most likely by the same mechanism as lead nitrate. The peak between 600 and 500 mV (vs normal hydrogen electrode, NHE) corresponds to AuPb 2 alloy, the peak between 500 and 400 mV corresponds to AuPb 3 alloy,

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INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF

hours leaching by the addition of lead nitrate as 0.1-0.5 kg/Mg. NaCN consumption decreased or did not change except for the Ovacik ore. In the case of the Ovacik ore it slightly increased. Keywords: lead nitrate, gold, silver, cyanide leaching Introduction Extraction of gold from its ores by cyanide leaching has been the preferred method for

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Effect Of Lead Nitrate On Cyanidation Of Gold Or

lead nitrate leaching copper gold silver. silver cyanide leaching. influence of lead nitrate on cyanide leaching of increase in gold and silver recoveries between 0. 1.2% for gold and 3. 11.6% for silver at the end of 24 hours leaching by the addition of lead nitrate as 0. 0.5 kg/mg. nacn consumption decreased or did not change except for the

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Effects of sulfide and lead nitrate addition to a gold

For pyrite, lead nitrate addition during pre-oxidation resulted in a significant increase of gold leaching, whereas its addition to subsequent cyanidation canceled the positive effects of pre

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Cyanidation of a copper-gold ore ScienceDirect

Aug 01, 1997· The addition of lead nitrate results in a higher gold extraction, although cyanide consumption cannot be reduced below 1.85 kg/t without a drop in the extraction. Without lead nitrate, the gold recovery is lower than 90% but with lead nitrate, it reaches 98%. The addition of oxygen increases the gold recovery by 1.5%.

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Lead Nitrate in Cyanidation Hydrometallurgy: Leaching in

To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN Use Add New Topic to ask a New Question/Discussion about Hydrometallurgy. OR Select a Topic that Interests you. Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. Use Add Comment = to comment on someone else

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MODELING OF GOLD CYANIDATION

Keywords: Gold cyanidation; Leaching; Reaction kinetics; Modeling The chemistry of gold dissolution in alkaline cyanide solution has continually received attention and new rate equations expressing the gold leaching are still developed. The effect of leaching parameters on gold cyanidation is studied in this

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how to apply lead nitrate in leaching pyrite gold

Effect of oxygen and lead nitrate on the cyanidation of a and lead nitrate on leaching of gold from 4 Cyanidation of a sulphide bearing gold . Get Price. Price: Chat Online. Lead(II) nitrate Wikipedia. The complex formed by lead(II) nitrate, lead(II) To improve the leaching process in the gold cyanidation, lead(II) nitrate solution is added.

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(PDF) EFFECT OF LEAD NITRATE ON CYANIDATION OF

Results have shown that the gold leaching kinetics could be significantly improved by the addition 100–200 g/t lead nitrate directly in the grinding circuit, followed by a 6 h cyanidation.

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Influence of lead nitrate on cyanide leaching of gold and

Ovacik cyanidation plant leaching time, 24 hours for the constant 100 Mg/h ore feed rate was applied as optimal for all lead nitrate tests. Results showed the increase in gold and silver recoveries between 0.4-1.2% for gold and 3.9-11.6% for silver at the end of 24 hours leaching by the addition of lead nitrate

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