effect of lead nitrate during cyanidation of gold ores

effect of lead nitrate during cyanidation of gold ores

Effect of lead nitrate on cyanidation of gold ores ...

Oct 01, 2000  Effect of lead nitrate on cyanidation of gold ores 1267 It is interesting to note that when the gold electrode treated with lead sulfide was put in 1 M NaCN solution without lead nitrate addition, and the same potential sweep used in Figure 3 was performed, four

(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 ...

Effect of lead nitrate on cyanidation of gold ores ...

The effect of lead nitrate is subtler for chalcopyrite and pyrrhotite because it was less effective to retard the reaction of sulphides with cyanide and the reaction of iron with oxygen. For gold, the addition of lead nitrate has the same effect with pyrrhotite than with pyrite; inhibiting partially the

(PDF) EFFECT OF LEAD NITRATE ON CYANIDATION OF

Further, the kinetics of cyanidation of gold ores in the presence of sulphides with and without lead nitrate additions, and the effect on reagent consumption were determined. View Show abstract

Effect of oxygen and lead nitrate on the cyanidation of a ...

Aug 01, 1995  Effect of oxygen and lead nitrate on the cyanidation of a sulphide bearing gold ore. ... Figure 2 shows the effect of using a pre-leach ahead of cyanidation and addition of oxygen and lead nitrate during gold leaching. The pre-leach dissolves and oxidizes soluble sulphides from pyrite, pyrrhotite and chalcopyrite dissolution to sulphate ...

(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

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

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

(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

INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF GOLD

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

Effect of Oxidative Pretreatment and Lead Nitrate Addition ...

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 increased from 79.4% to 89.4% in the presence ...

Gold cyanidation - Wikipedia

Lead nitrate can improve gold leaching speed and quantity recovered, particularly in processing partially oxidized ores. Effect of dissolved oxygen . Oxygen is one of the reagents consumed during cyanidation, and a deficiency in dissolved oxygen slows leaching rate. Air or pure oxygen gas can be purged through the pulp to maximize the dissolved ...

Effect of Lead Nitrate on Gold Leach Kinetics ...

Tests were run in which the effects of lead nitrate at pH 10 were investigated on the cyanidation of synthetic gold ores containing these minerals. The usual procedure was followed. The pregnant solutions were analysed for total sulphide sulphur, total sulphur, thiocyanate, and arsenic or antimony.

(PDF) Cyanidation of Refractory Gold Ores: A Review

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 ...

Cyanidation of a copper-gold ore - ScienceDirect

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

Gold Metallurgy Leaching in Cyanicides

Mar 17, 2017  Cyanidation as applied to ordinary gold and silver ores is a relatively simple process. When cyanicides {cyanide-consuming elements) are encountered in small amounts in the treatment of such ores, the various schemes already discussed, such as use of a lead salt or wasting barren solution, can usually be resorted to and successful operation maintained.

The Use of Oxygen in Gold Cyanidation: Canadian ...

Jul 18, 2013  The oxidation of sulphide ion into sulphate and iron into ferric ion during pretreatment is beneficial to subsequent cyanide consumption. Gold leaching optimization studies were performed with one gold ore sample. Cyanide consumption was found to be strongly affected by the leaching pH and the “free” cyanide concentration in the slurry.

Treatment of copper-rich gold ore by cyanide leaching ...

Feb 01, 2015  Pre-aeration of ore prior to cyanidation and/or addition of lead nitrate can be beneficial for mitigating problems associated with sulphide minerals during cyanidation of gold [13,14,16]. Preleaching of ore can be undertaken to remove reactive copper minerals prior to cyanide leaching of gold.

(PDF) The Use of Oxygen in Gold Cyanidation Wesley ...

Fig. 4. Cyanide addition as a function of "free" cyanide concentration from Canadian gold mill practice [14].All variables tested in the experimental design have a significant effect on gold dissolution rate, with lead nitrate addition having a pronounced effect.

Gold Cyanidation Process - Mineral Processing Metallurgy

The gold cyanidation process is the most important method ever developed for extracting gold from its ores. The reasons the widespread acceptance of cyanidation are economic as well as metallurgical. It usually obtains a higher recovery of gold than plate amalgamation and is easier to operate than the chlorine or bromine process.

Cyanidation of a pyrrhotite-bearing gold ore

The lime, sodium cyanide, lead nitrate and oxygen were all certified reagent grade chemicals. Distilled water was used to pulp the ore. The gold-leaching cell is made of glass, with a capacity of two litres. The tests were performed on a pulp of 50% weight (1000g of ore with 1000ml of solution). Most of the

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

INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF GOLD

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

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 did not improve with adding lead nitrate or

Gold_cyanidation - chemeurope

Effect of Lead Nitrate. Lead nitrate can improve gold leaching speed and quantity recovered, particularly in processing partially oxidized ores. Effect of Dissolved Oxygen. Oxygen is one of the reagents consumed during cyanidation, and a deficiency in dissolved oxygen in

(PDF) Cyanidation of Refractory Gold Ores: A Review

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 ...

Arsenic and Antimony Sulphide Minerals in Cyanidation

May 12, 2017  The effects of lead nitrate on the cyanidation of synthetic gold ore containing orpiment at pH 10, were investigated. 0.3 lb. of lead nitrate per ton failed to increase extraction; the solutions still contained soluble sulphides. When the amount was increased to 1.5 lb/ton the

Cyanidation of gold ores containing copper, silver, lead ...

Since a large proportion of gold ores contain sulfide minerals, the effects of these minerals on gold dissolution in cyanide solution have interested many researchers.The initial rate of gold dissolution is largely controlled by the factors such as cyanide and oxygen concentrations, pH, solid-liquid interface, Eh of the slurry, alkalies ...

Gold Metallurgy Leaching in Cyanicides

Mar 17, 2017  Cyanidation as applied to ordinary gold and silver ores is a relatively simple process. When cyanicides {cyanide-consuming elements) are encountered in small amounts in the treatment of such ores, the various schemes already discussed, such as use of a lead salt or wasting barren solution, can usually be resorted to and successful operation maintained.

MODELING OF GOLD CYANIDATION

Figure 10 Effect of pH on cyanide consumption (Linget al., 1996)..... 34 Figure 11 The residual gold concentration as a function of the ore particle size 35 Figure 12 Gold dissolution rate for ore average particle size 30 and 177 m: (a) as a function of the dissolved oxygen concentration; (b) as a function

(PDF) Treatment of a Copper-Rich Gold Ore by Ammonia ...

Similarly, the pretreatment of the ore by ammonia leaching was shown to lead to high gold extractions (98%), in subsequent cyanide leaching with significant reductions in the consumption of cyanide.

Gold Cyanidation Process - Mineral Processing Metallurgy

The gold cyanidation process is the most important method ever developed for extracting gold from its ores. The reasons the widespread acceptance of cyanidation are economic as well as metallurgical. It usually obtains a higher recovery of gold than plate amalgamation and is easier to operate than the chlorine or bromine process.

Treatment of copper-rich gold ore by cyanide leaching ...

phases including copper sulphides present in the ore can also lead to the passivation of gold surface in addition to its consumption of cyanide and oxygen [1]. Pre-aeration of ore prior to cyanidation and/or addition of lead nitrate can be beneficial for mitigating problems associated with sulphide minerals during cyanidation of gold [13,14,16].

The Use of Oxygen in Gold Cyanidation: Canadian ...

Jul 18, 2013  The oxidation of sulphide ion into sulphate and iron into ferric ion during pretreatment is beneficial to subsequent cyanide consumption. Gold leaching optimization studies were performed with one gold ore sample. Cyanide consumption was found to be strongly affected by the leaching pH and the “free” cyanide concentration in the slurry.

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

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 determined.