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Lead nitrate passivizes the pyrite by forming a hydroxide (Pb(OH)2) layer on pyrite surface reducing the dissolution of pyrite. Dissolution of pyrite forms a sulfur layer on gold causing …
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Adding lead nitrate had a negligible effect on gold extraction whilst improving silver extraction. Dissolution of copper was substantially suppressed by adding lead nitrate, i.e., from 23% (no Pb(NO 3) 2) to 4% (500 g/t Pb(NO 3) 2) over 24 h. Zinc dissolution was negligible (≤0.01%). Pre-aeration of the concentrate improved the gold and ...
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Leaching, often gold, is the process of extracting a soluble constituent from a solid by means of a solvent. In extractive metallurgy, of gold, it is the process of dissolving a certain mineral (or minerals) from an ore or a concentrate, or dissolving certain constituents from materials such as a calcines, mattes, scrap alloys, anodic slimes, etc., to achieve either one or …
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Problem with gold recovery from sulphide ore: How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return.This latter point is most important. In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all the ore will report very low gold content in the tailings …
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gold, the addition of lead nitrate has the same effect with pyrrhotite than with pyrite; inhibiting partially the formation of a sulphur layer. This was not observed for the gold in the chalcopyrite
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NaCN and 0.1 kg/Mg of lead nitrate. A further increase of lead nitrate to 0.3 kg/Mg resulted in the decrease of Au and Ag leach recovery by comparing with the test of 0.2 kg/Mg lead nitrate, indicating the formation of Pb(OH) 2 passive layer on gold. Besides, NaCN consumption increased from 0.24 kg/Mg without lead nitrate to 0.27
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Lead nitrate forms a hydroxide layer on pyrite particles, which reduces the reaction rate with cyanide. The disolution of pyrite generates a sulphur layer on gold. This layer is less …
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Effect of lead nitrate addition on cyanidation of Havran, Ovacik, Mastra LCu (low copper) and Mastra HCu (high copper) gold ores was investigated by laboratory tests at the Ovacik Gold Mine Metallurgy Laboratory. Leach tests were performed at optimum NaCN additions and pH values while different lead nitrate additions were applied. Ovacik cyanidation plant …
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The use of lead nitrate, high lime and carbon-in-leach generated a faster leaching rate and minimised adsorption of gold on fine pyrite particles. The grind, previously controlled with a P80, was replaced by a P98 to give a better operational indication of …
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In this paper, the role of grinding media type on cyanide-based gold leaching in the presence of pyrrhotite was investigated. Pyrrhotite commonly occurs in many gold ores together with pyrite and ...
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This may result in dissolved oxygen starvation for the oxidative leaching of the gold, and ultimately it will reduce the maximum attainable recovery of gold from the ore. ... 2005, Ubaldini et al., 2000, Muravyov and Bulaev, 2013); chemical oxidation with O 2 enriched air, high pressure, and/or lead nitrate (Deschênes and Wallingford, 1995 ...
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The gold reduction kinetics seems to be faster onto activated carbon than in raw material containing preg-robbing material because the addition of activated carbon was found to increase gold extraction. The addition of lead nitrate to gold chloride-bromide leaching increased gold extraction even further, up to 88%.
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This study takes a silver-containing gold ore as the research object and investigates the effect of (i) sodium sulfite as an additive, (ii) main gold-bearing mineral pyrite, and (iii) gangue mineral quartz, on silver during the roasting process in roasting and leaching tests. Characterization techniques included scanning electron microscopy ...
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Pyrite is the earth's most abundant sulfide mineral.Its frequent undesirable association with minerals of economic value such as sphalerite, chalcopyrite and galena, and precious metals such as gold necessitates costly separation processes such as leaching and flotation.Additionally pyrite oxidation is a major contributor to the environmental problem of acid …
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sulphide gold-silver o re leaching study, lead nitrate, H 2 O 2, and aer ation using an air pump were investigated in order to reduce the consumption of
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Pre-leaching was deleterious for the ore containing chalcopyrite while pre-leaching with lead nitrate was very efficient to decrease the reactivity of the ore containing pyrite. The two gold ores ...
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Oxygen demand of each gold ore is dependent on the pyrite content and its mineralogical origin. 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.
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Keywords: gold-tellurides; flotation; leaching; oxidation 1. Introduction Gold occurs primarily in its native form and secondarily as gold solid-solution of which tellurides are an example [1]. Gold extraction from tellurides has attracted increasing at-tention over …
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These results suggested that lead nitrate can improve silver extraction while suppressing copper dissolution, which would be advantageous in the leaching-adsorption circuit (CIP), mitigating …
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This paper quantifies the detrimental effects of pyrite and stibnite on gold leaching kinetics. Means to reduce the effect of these minerals by addition of lead nitrate and oxygen are presented. A significant retarding effect was observed when the pyrite concentration was 20%. A pretreat- ment with lead nitrate reduced the extent of gold surface coating by Ag, Fe and S. Stibnite, at a ...
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pretreatment process ahead of cyanide leaching was also examined. Only ~12% of gold was extracted by direct cyanide leaching of the ore. The addition of lead nitrate did not affect the leaching of gold. When ammoniacal cyanide leaching system was used, the extraction of gold was significantly improved to >90%.
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DOI: 10.1016/S0892-6875(00)00109-6 Corpus ID: 97067548; Effect of lead nitrate on cyanidation of gold ores : Progress on the study of the mechanisms @article{Deschnes2000EffectOL, title={Effect of lead nitrate on cyanidation of gold ores : Progress on the study of the mechanisms}, author={Guy Desch{^e}nes and Rolando Lastra and J. Reuben Brown and S. X. Jin and O. …
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Occasionally pyrite may also carry dispersions of valuable metals such as gold and is sometimes mined for this [3], in addition pyrite is commonly used for production of sulfuric acid [4]. Pyrite oxidation is economically important in mineral flotation and leaching, two industrial methodologies used to separate pyrite from other minerals of value.
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House, 2006; Celep et al., 2015). However, the controlled addition of lead nitrate is required since it can also be detrimental to the gold leaching when added in excess. The detrimental effect of lead nitrate is ascribed to the precipitation of lead on …
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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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Various leaching parameters such as particle size, cyanide concentration, pH and the application of oxygen and lead nitrate have been investigated for the recovery of gold from …
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Learn everything you must take into account when using lead nitrate in mining applications. Indicated percentages of use are: Lead nitrate percentages in Merrill Crowe: The most effective lead nitrate addition has been reported to be 1:5 to …
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For pyrite, a pre-leaching without lead nitrate was beneficial with a decrease of 83% in cyanide consumption (from 1.23 kg/t to 0.21 kg/t). The addition of lead nitrate to the pre-leaching had no significant benefit. With pyrrhotite, a pre-leaching with or without lead nitrate had no significant effect on cyanide consumed.
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Download scientific diagram | -Effects of pre-treatment, lead nitrate, and low pH on gold leaching kinetics. Pre-treatment: P 80 71µm, 500 g/t lead nitrate, pH 10.5, 8 ppm DO, 8 h; Cyanidation ...
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The use of lead nitrate, high lime and carbon-in-leach generated a faster leaching rate and minimised adsorption of gold on fine pyrite particles. The grind, previously controlled with a …
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The application of lead nitrate in combination with oxygen generated the best results. Gold extraction of 96% can be obtained with cyanide consumption of 0.51 kg/t and lime consumption of 0.60 kg/t in 24 hours. A four hour pre-leach followed by cyanidation is required (free cyanide concentration 480 ppm, pH 10.5, lead nitrate 200 g/t and 16 ppm ...
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Lead nitrate solutions may be added to aid in the precipitation of the soluble salts. Chemical oxidizers such as potassium permanganate are also used. Some of these problems are also discussed further under the heading of …
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The leach conditions used were:- 1.Stage 1: Leaching in dilute cyanide (0.1%) at pH 9.5 for 24 hours to dissolve native gold but not gold ± silver tellurides.2.Stage 2: leaching the residue from ...
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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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Besides gold, this study demonstrated the behaviour of silver and base metals (copper and zinc) from the pyritic gold concentrate. Adding lead nitrate had a negligible effect on gold extraction ...
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Keywords: Hydrometallurgy; Leaching; Gold 1. INTRODUCTION Many gold ores are problematic as they contain metal sulfides, such as pyrite, arsenopyrite and chalcopyrite. These ores are often refractory, as the gold is encapsulated within the sulfide matrix. In order to recover the gold, the host matrix must be destroyed.
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