The goal of the current work is to quantify the influence of lead nitrate on the leaching kinetics and reagents consumption during the leaching of a gold ore containing chalcopyrite and also pyrrhotite as the reactive sulphide minerals to obtain an efficient extraction of gold, an acceptable consumption of cyanide and a modification of the ...
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 ...
Abstract: 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
Discussion The use of a gold foil was selected for analytical purposes. The consequence is that the passive layer related to the formation of reaction product on the substrate represents a smaller ration than it would be on gold Effect of lead nitrate on cyanidation of gold ores 1271 grains.
Oct 01, 2000· Read "Effect of lead nitrate on cyanidation of gold ores: progress on the study of the mechanisms, Minerals Engineering" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
It has also been reported that the effect of lead nitrate was especially noticeable at low cyanide concentrations while there was no advantage at high cyanide concentrations (Weichselbaum et al., 1989). The present research work aims at evaluating the leaching behaviour of non-refractory sulphide gold-silver ore.
cyanide leaching, by addition of 300 g/Mg lead nitrate to the leach slurry. Furthermore, numerous studies have shown that lead nitrate addition reduces the detrimental effect of metallic sulfides, increases gold leaching recovery and/or inhibits the dissolution of metallic sulfides, thus reduces cyanide consumption (Deschenes et al., 2003).
Read "Effect of oxygen and lead nitrate on the cyanidation of a sulphide bearing gold ore, Minerals Engineering" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
The successful cyanidation of gold ores containing appreciable amounts of arsenic or antimony sulphide minerals such as orpiment, realgar, and stibnite is usually difficult or even impossible. Extractions are low and the solutions soon become 'foul.' The gold in such ores could be free and uncoated, and no trouble in dissolving it in clean cyanide solutions would be expected.
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 The electrochemical behavior of lead nitrate during . Extraction of gold and silver at the Kupol Mill,
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 O 2). Compared to the plant performance that uses different leaching conditions, these results show three fold reduction in cyanide consumption and a 20% enhancement of gold leaching kinetics.
These extractions, however, were considerably lower than those of the control tests where orpiment and stibnite were absent. 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.
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 leaching time, 24 hours for the ...
ls Engineering, Vol. 8, No. 8, pp. 923-931, 1995 er Science Ltd PCrpmon Printed in Great Britain 75(95)00054-2 0892-6875/95 $9.50o TECHNICAL NOTE EFFECT OF OXYGEN AND LEAD NITRATE ON THE CYANIDATION OF A SULPHIDE BEARING GOLD ORE A G. DESCHENES and G. WALLINGFORD Resource Utilization Laboratory, CANMET, Mineral Sciences Laboratories 555 Booth …
The addition of lead nitrate to sulfides in cyanide solution can create a synergetic effect which results in an increase in dissolution rates of gold in cyanide solutions and this is accompanied by a drop in the corrosion potential of gold and a dramatic decline in thiocyanate and free sulfide concentrations.
Abstract: Effect of lead nitrate addition on cyanidation of Havran, Ovacık, 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
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. Get Price And Support Online; How To Apply Lead Nitrate In Leaching Pyrite Gold. Effect of Lead Nitrate on Gold Leach .
Lead nitrate has a different effect than lime addition. it was that increasing the lead nitrate concentration initially increased cyanide consumption from 0–100 grt lead nitrate. and than reduced it back to 1.13 kgrt at 800 grt lead nitrate. Cyanide consumption caused by the formation of thiocyanates was thus about 30% and copper was he main ...
Abstract. 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.
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.
The high solubility of copper sulphide minerals is an issue in the cyanidation of gold ores. The objective of this study was to quantify the effect of individual copper sulphide minerals on the Hunt process, which showed advantages over cyanidation. High purity djurleite, bornite and chalcopyrite, with a P70 of 70–74 microns, were mixed with fine quartz and gold powder (3–8 micron) to ...