[PDF] Cyanidation of a pyrrhotite-bearing gold ore,
The Musselwhite Mine in Canada processes a free milling gold ore at 5.5-5.8g/t Au and 4.2% pyrrhotite. A laboratory investigation was conducted to improve cyanidation. The pyrrhotite was determined to be 50% monoclinic and 50% hexagonal. A leach using 8ppm dissolved oxygen yielded only 82.3% gold extraction with a 0.29kg/t NaCN consumed. The addition of lead nitrate, directly to the leach,Cyanidation of a pyrrhotite-bearing gold ore,Cyanidation of a pyrrhotite-bearing gold ore G. Deschênes1*, D. Hall2 and M. Fulton1 1 Mining and Mineral Sciences Laboratories, CANMET, Natural Resources Canada, 555 Booth Street, Ottawa, Ontario, K1A 0G1 Canada 2 Placer Dome Canada, Musselwhite Mine, P.O. Box 7500,Thunder Bay, Ontario, P7B 6S8 Canada Received 30 July 2002; accepted 21,Cyanide Leaching and Decomposition of Pyrrhotite,Oct 14, 2015· An EXAMPLE ore deposit is know for its gold bearing pyrite concentrate containing pyrrhotite and chalcopyrite is preaerated in a high lime solution ahead of cyanidation. Optimum results as regards gold extraction and cyanide consumption are obtained when using well aerated cyanide solutions containing at least 0.05% CaO and saturated with,Gold recovery from a refractory pyrrhotite ore by,,Dec 01, 2000· The gold content of the ore sample, coming from Bolivia, was of 10 g t −1 Au. After 24 h leaching time by direct cyanidation, low gold recovery was obtained (<20% Au), with a high reagent consumption. On the other hand, a high gold recovery was achieved for the biooxidated samples: after 24 h cyanidation gold dissolution reached about 91% Au.17 - Flotation of Gold Ores,The flotation of gold-bearing ores is classified according to ore type (i.e. gold ore, gold, PGMs (i.e. nickel, pyrrhotite, copper and pyrite). Therefore, the reagent scheme developed, these ores belong to a group of difficult-to-treat ores, where cyanidation usually produces poor extraction. Mercury is partially soluble in cyanide, which,Gold Metallurgy & Leaching in Cyanicides,Jul 14, 2016· 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.
cyanidation of a pyrrhotite bearing gold ore | Prominer,
PDF Cyanidation of a pyrrhotite-bearing gold ore . Cyanidation of a pyrrhotite-bearing gold ore. The Musselwhite Mine in Canada processes a free milling gold ore at 5.5-5.8g/t Au and 4.2% pyrrhotite. A laboratory investigation was conducted to improve cyanidation. The pyrrhotite was determined to be 50% monoclinic and 50% hexagonal. Get PriceEffect of Oxygen on Gold Leaching - 911 Metallurgist,Dec 25, 2015· The pH conditions for gold dissolution to occur the Eh-pH diagram for the gold-cyanide aqueous system. The area above the O2/H2O line represents the Eh-pH range under which oxygen reduction can occur (and corresponding oxidation of gold). Cyanidation of a pyrrhotite-bearing gold oreThe reasons of gold refractory, Gold ore classification,,Nov 28, 2016· The most of refractory ore is gold bearing sulfide., Gold ore like pyrrhotite., method is easier to complete alkaline pre-oxidation for pyrrhotite, so makes gold easier to cyanide and leach.,Gold cyanidation - Wikipedia,Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex.It is the most commonly used leaching process for gold extraction.. Production of reagents for mineral processing to recover gold, copper, zinc and silver represents,Gold recovery from a refractory pyrrhotite ore by,,Dec 01, 2000· The gold content of the ore sample, coming from Bolivia, was of 10 g t −1 Au. After 24 h leaching time by direct cyanidation, low gold recovery was obtained (<20% Au), with a high reagent consumption. On the other hand, a high gold recovery was achieved for the biooxidated samples: after 24 h cyanidation gold dissolution reached about 91% Au.Reactions of gold and sulfide minerals in cyanide media,,Nov 01, 2002· 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.
Gold Metallurgy & Leaching in Cyanicides
Jul 14, 2016· 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.Gold Agitation Cyanidation Leaching,Oct 18, 2019· For sulfide gold-bearing ores, flotation enrichment is often used., For ore with higher arsenic or pyrrhotite, flotation concentrate ore roasting desulfurization or arsenic removal is carried out, and then the calcine is cyanated and leached., Taking the 7.5g/t gold ore cyanide plant with a capacity of 100,000 tons per month as an example,Gold Cyanidation Process - 911 Metallurgist,Jun 08, 2016· 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.Characterization of refractory behaviour of complex gold,,1.3% to 2.4% of the gold was leachable with direct cyanidation and approximately 95% of Au in ore was extracted by means of selective destruction of gold-bearing minerals with nitric and sulphuric acids. TEAGUE et al[22] studied diagnostic leaching of a refractory gold ore containing 5.9% pyrrhotite, 0.9%The reasons of gold refractory, Gold ore classification,,Nov 28, 2016· The most of refractory ore is gold bearing sulfide., Gold ore like pyrrhotite., method is easier to complete alkaline pre-oxidation for pyrrhotite, so makes gold easier to cyanide and leach.,Release of arsenic from cyanidation tailings - ScienceDirect,Jul 01, 2016· During the cyanidation process, the ore is subjected to a cyanide solution under alkaline conditions (pH 9.5–10) for up to 36 h. Many gold ores contain arsenic (As) in the form of arsenopyrite, which usually co-exists with other sulphide minerals, such as pyrrhotite and pyrite.
ALTA Gold 2012 E-Doc - Home | Albion Process
Cyanide Recoverable gold Average gold and silver extraction reported in test work for both Ore A and B are illustrated in Figure 3. Direct cyanidation of Ore A yielded poor gold extractions in the mid twenty percentile for ore ground to a P 80 of 53 micrometres. Some test work investigated cyanidation of tails but the grade of theGold cyanidation - Wikipedia,Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex.It is the most commonly used leaching process for gold extraction.. Production of reagents for mineral processing to recover gold, copper, zinc and silver represents,(PDF) Cyanidation of gold ores containing copper, silver,,Cyanidation of gold ores containing copper, silver, lead, arsenic and antimony. Fathi Habashi. Related Papers. Influence of potassium hydroxide pretreatment on the extraction of gold and silver from a refractory ore. By ibrahim alp. Evaluation of Refractory Behaviour of Kaletaş (Turkey) Gold Ore.(PDF) The Use of Oxygen in Gold Cyanidation | Wesley,,Direct cyanidation of refractory gold ore or concentrate yields poor gold recovery: therefore. oxidative treatment is conducted on the refractory gold ore or concentrate prior to gold recovery by a cyanide leaching process r&31. Minerals susceptible to oxidation invariably occur in gold ores in much higher concentration than gold.Gold Extraction - an overview | ScienceDirect Topics,The core of partially oxidized arsenopyrite particles is a gold-bearing pyrrhotite (Chryssoulis, 1991). The submicroscopic gold content of the pyrrhotite is comparable to that of the precursor arsenopyrite (see Figure 5.30), indicating that arsenic was removed leaving behind the gold. Low-permeability hematite/magnetite particles are,Pyrrhotite Processing - BCC di Valledolmo,Aug 08, 2017· Cyanidation of a pyrrhotite-bearing gold ore 911. The European Journal of Mineral Processing and Environmental Protection Vol.3, No.3, 1303-0868, 2003, pp. 353-361 Cyanidation of a pyrrhotite-bearing gold ore . tangible benefits pyrrhotite iron ore processing line. tangible benefits pyrrhotite iron ore processing line price in Mwanza Tanzania,
Gold Agitation Cyanidation Leaching
Oct 18, 2019· For sulfide gold-bearing ores, flotation enrichment is often used., For ore with higher arsenic or pyrrhotite, flotation concentrate ore roasting desulfurization or arsenic removal is carried out, and then the calcine is cyanated and leached., Taking the 7.5g/t gold ore cyanide plant with a capacity of 100,000 tons per month as an example,(PDF) The Use of Oxygen in Gold Cyanidation | Wesley,,Direct cyanidation of refractory gold ore or concentrate yields poor gold recovery: therefore. oxidative treatment is conducted on the refractory gold ore or concentrate prior to gold recovery by a cyanide leaching process r&31. Minerals susceptible to oxidation invariably occur in gold ores in much higher concentration than gold.The reasons of gold refractory, Gold ore classification,,Nov 28, 2016· The most of refractory ore is gold bearing sulfide., Gold ore like pyrrhotite., method is easier to complete alkaline pre-oxidation for pyrrhotite, so makes gold easier to cyanide and leach.,Passivation of a Pyrrhotite-Rich Flotation Concentrate for,,Jan 01, 2017· "The Éléonore mine, located in the James Bay region of Northern Quebec, generates a gold bearing flotation concentrate rich in pyrrhotite. Direct leaching of the finely ground concentrate results in high cyanide consumptions and poor recoveries, so effective pre-treatment to passivate the pyrrhotite is required before leaching.Characterization of refractory behaviour of complex gold,,1.3% to 2.4% of the gold was leachable with direct cyanidation and approximately 95% of Au in ore was extracted by means of selective destruction of gold-bearing minerals with nitric and sulphuric acids. TEAGUE et al[22] studied diagnostic leaching of a refractory gold ore containing 5.9% pyrrhotite, 0.9%Pyrrhotite Processing - BCC di Valledolmo,Aug 08, 2017· Cyanidation of a pyrrhotite-bearing gold ore 911. The European Journal of Mineral Processing and Environmental Protection Vol.3, No.3, 1303-0868, 2003, pp. 353-361 Cyanidation of a pyrrhotite-bearing gold ore . tangible benefits pyrrhotite iron ore processing line. tangible benefits pyrrhotite iron ore processing line price in Mwanza Tanzania,
INFLUENCE OF PRE-AERATION ON CYANIDE LEACHING OF A
cyanide consumers and/or high silver content (i.e., >20 g/Mg). In such cases, higher cyanide concentrations, in the range of 2 to10 g/dm3 NaCN, are needed. For those ores, gold recoveries may be reached above 90% indicating that the ore is non-refractory (Marsden and House, 2006). Although acceptable extractions can beALTA Gold 2012 E-Doc - Home | Albion Process,Cyanide Recoverable gold Average gold and silver extraction reported in test work for both Ore A and B are illustrated in Figure 3. Direct cyanidation of Ore A yielded poor gold extractions in the mid twenty percentile for ore ground to a P 80 of 53 micrometres. Some test work investigated cyanidation of tails but the grade of theEvaluation of Refractory Behaviour of Kaletaş (Turkey,,Conditions for two-stage cyanide leaching of ultrafinely ground ore to determine the gold available to cyanidation are presented in Table 6. Figure 4. Experimental set-up for cyanide and diagnostic leaching of the ore. Table 3. Experimental conditions for cyanide leaching of the ore and calcine. Sample weight, g Water Girind time, min.Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite,Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite Ores, Cyanidation of the leach residues resulted in 90 to 93 pct Au and 60 to 80 pct Ag extractions, compared with only 5 and 15 pct, respectively, without the pretreatment. The procedure was further tested by leaching aEstablishing thE ProcEss MinEralogy of gold orEs,gold ores can be classified into 11 types (Table 1). Some metallurgical implications to these gold ore types are summarised below: Placers, quartz vein gold ores and oxidized ores: Generally, placers, quartz vein gold ores and oxidized ores are free-milling and gold can be recovered by gravity and/or direct cyanide leaching.The Metallurgy of Cyanide Gold Leaching – An Introduction,,Oct 20, 2014· Liberation: Cyanide leaching will only be effective if the cyanide can come in contact with the gold particle. For this to happen, the ore should either be sufficiently porous for cyanide to reach the gold, or more usually the ore is crushed and ground to a size at which the surface of the gold is exposed – i.e. the gold is liberated.
Process development metallurgical studies for gold,
Nov 01, 2016· In recent years the gold mining industry has been challenged by declining metal prices as well as having to treat ores that have low grades and are refractory in nature. Many factors must be considered when metallurgical studies are designed to develop process design criteria for these type of ores. These factors are mostly related to the mineralogical and chemical compositions of the ores,The effect of grinding chemistry on cyanide leaching of,,For that reason, cyanide gold leaching is very efficient when ceramic or high chromium media was used during the grinding of the ore. It can be expected that the leach behaviour would be different if leaching is preceded by pre-oxidation, as is often done for pyrrhotite bearing ores.,,,,
