Download Cyanidation of gold ores c.pdf... International Journal of Mineral Processing 95 (2010) 68–77Contents lists available at ScienceDirect International Journal of Mineral Processing j o u r n a l h o m e p a g e : w w w. e l s ev i e r. c o m / l o c a t e / i j m i n p r o Cyanidation of gold ores containing copper, silver, lead, arsenic and antimony P. Karimi a,⁎, H. Abdollahi a, A ...
Cyanidation is, undoubtedly, still the most important and widespread of the various hydrometallurgical technologies used in the extraction of gold and silver from primary ores and concentrates. Used for over 100 years, the popularity of cyanidation is based mostly on the simplicity of the process, yet, despite this fact, the reactions involved ...
Cyanidation and Concentration of Gold and Silver Ores John Van Nostrand Dorr, Francis Lawrence Bosqui Snippet view - 1950. Cyanidation and Concentration of Gold and Silver Ores ... solution bowl cake calcine capacity carried cells cent charge circuit classifier cleaned closed Company concentrate cone consumption containing continuous copper ...
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.
Most gold ores contain copper, lead, zinc, iron, sulfur and other minerals, so not only gold and silver can be recovered from the tailings after cyanidation, but also a considerable amount of associated metals can be recovered. At present, the comprehensive recovery of valuable elements in gold tailings is mainly focused on gold, silver, iron ...
minerals in complex ores; but, as with caustic cyanide, gold and silver extrac tion is usually low with complex sulfide gold-silver ores. A procedure to extract silver from sulfide ores with FeC13 was patented by Hey in 1922 (6). Considera ble work was completed by-Wong (7) to re cover lead from a galena concentrate with
Gold is found in very low concentrations in the ores from which it is mined. Generally, to recover the gold requires separation of it from the associated minerals in the ore, which could be achieved by selectively dissolving the gold in a suitable lixiviant. Worldwide, majority of gold is extracted from it ores using cyanide as a lixiviant.
Cyanidation of gold ores containing copper, silver, lead . Cyanidation of gold ores containing copper, silver, lead, arsenic and antimony Article (PDF Available) in International Journal of Mineral Processing 95(1):68 77 · July 2010 with 1,519 Reads. Online Service
The sulphur antimony copper silver ore and argentojarosite cannot be extracted by cyanidation. When formulating a cyanidation system for silver-containing ore, the following measures should be taken: 1) Leach with concentrated cyanide solution (0.2~0.6% NaCN); 2) Long time (up to 2 to 3 days) leaching; 3) Inflate strongly into the pulp;
addition. Although gold is unaffected, some of the silver precipitates with the mercury. The objective of this investigation was to study (1) silver 10s8 during CaS precipitation of mercury in gold-silver cyanide-leach slurries and in solutions prepared from mercury-containing gold …
4. Gold Cyanidation Case. There is a 270tpd gold and silver cyanidation plant in Japan, in which the metal minerals mainly include native gold, silver, and pyrite. Gangue minerals mainly composed of quartz and calcite. Gold exists mainly in free state in ore. The ore contains 5.0g/t of gold and 20g/t of silver.
In many places, silver ore is often found in combination with other ores containing other commercially viable minerals such as copper, lead or gold. When silver is a byproduct of processing these other minerals then a different method has to be used to extract the silver ore.
Karimi P, Abdollahi H, Amini A, Noaparast M, Shafaei SZ, Habashi F (2010) Cyanidation of gold ores containing copper, silver, lead, arsenic and antimony. Int J …
Influence of lead nitrate on cyanide leaching of gold and silver from Turkish gold ores 509 similar effect inhibiting partially the formation of sulfur layer. However, in the case of chalcopyrite this mechanism is not observed (Deschenes et al., 2000). On the other hand, in the presence of pyrite and pyrrhotite, formation of lead or
of gold and silver. Cyanidation has been used for over 100 years to extract precious metals from sulfide ores. Despite this fact, the reactions involved are not fully understood. More gold is recovered by cyanidation than by any other process. In cyanidation, metallic gold is oxidized and dissolved in an alkaline cyanide solution m- [6]. The ...
US4266972A - Process for non-ferrous metals production from complex sulphide ores containing copper, lead, zinc, silver and/or gold - Google Patents Process for non-ferrous metals production from complex sulphide ores containing copper, lead, zinc, silver and/or gold ... lead zinc leaching silver gold Prior art date Legal status (The ...
Cyanidation is a method used in the extraction of gold from its ore. This extraction is done by converting the gold to a water-soluble form. The cyanidation process of gold extraction or the use of cyanide is the most common leaching process, used in the extraction of gold from its ores.
Figure 5. Curves for copper dissolution, thiocyanate formation and cyanide consumption during the cyanidation of a pyrrhotite-bearing gold ore as a function of lead nitrate addition. The mass balance calculation on cyanide showed that the cyanide consumed by the formation of thiocyanate was reduced by more than 55% (from 35% to 15%).
US3357823A US365883A US36588364A US3357823A US 3357823 A US3357823 A US 3357823A US 365883 A US365883 A US 365883A US 36588364 A US36588364 A US 36588364A US 3357823 A US3357823 A US 3357823A Authority US United States Prior art keywords cyanide copper metal liquor electrodialyzer Prior art date Legal status (The legal status is an assumption and is not a …
8. Selective adsorption: activated carbon has the ability to selectively adsorb gold in gold and copper in gold leaching solution, which is beneficial to the separation of copper and gold. 9. Easy to use: the production process is consistent with the condition of using sodium cyanide, which makes it easy to use and promote. 10.
Introduction to Gold and Silver Leaching. The cyanide leaching process is the most important method ever developed for extracting gold from its ores. The early development of the process is attributed to a Scotchman, John Stewart Mac Arthur, in collaboration with the Forrest brothers. The method was introduced into South Africa in 1890.
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 …
Silver in gold ores occurs mainly as minor amounts of the natural gold-silver alloy called electrum. Warm to hot (hydrothermal) fluids generated within the earth form copper, lead and zinc ...
Gold is commonly associated with the sulfides of antimony, arsenic, copper, iron, and silver.3 B. Generalized Proc ess Description Precious metals may be recovered from the ore or from refining processes of base metals such as copper and
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When it comes to ores with more than 20 grams of gold in every ton of ore, vat leaching is performed to ensure the cyanidation process. On the other hand, heap leaching is done to extract gold from ores of lower gold content. Since these ores contain gold of extremely low density, vat leaching calls for high amounts of solids and solutions.
Cyanidation of gold ores containing copper, silver, lead, arsenic and antimony P. Karimia,⁎, H. Abdollahia, A. Aminib, M. Noaparasta, S.Z. Shafaeia, F. Habashic a ...
For example, a copper-lead-zinc processing plant in Russia recovered gold from lead flotation tailings (containing 0.15 mg / L of gold), increasing the gold recovery rate by 3%. 3. Recovery of Gold from Slime. A gold processing plant in the UK directly extracted gold and silver from the slime using CIP method, and achieved good results.
An exception should be made for ores with significant copper content. where "free" cyanide measurement (through silver nitrate titration) is profoundly interfered by copper content. Initial gold dissolution rate (moljcm-' * s) for sample A (Table 3) is between 0.85 and 11.7 x lo-l2 molicm'.
The gold- and silver-bearing copper ores exhibit great differences in form and age; neither do all the occurrences yield much gold or silver, and, moreover, they are of more importance as gold producers, silver being less often associated with the copper. 3. Lead-bearing Silver ores: These are silver ores containing 4 percent or more of lead.
