(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

Cyanidation of a pyrrhotite-bearing gold ore 911

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 November 2003

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

Cyanide Leaching and Decomposition of Pyrrhotite

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 calcium sulphate.

Coarse & Fine Free Gold in Arsenopyrite, Pyrrhotite, Pyrite

This study deals with an ore containing coarse and fine free gold associated with arsenopyrite, pyrrhotite, pyrite and graphite in a quartz and slate gangue. The sulphides and graphite constitute 10 to 12% of the ore. Treatment required utmost economy. The flowsheet was developed from batch and pilot tests with the required flexibility to permit initial operation as a 50 ton gravity mill with

Improvements in gold ore cyanidation by pre-oxidation

Pre-oxidation with H 2 O 2 prior to cyanidation increased DO from 1 up to 7.2 ppm. H 2 O 2 was injected at a rate of 0.24 kg 100% H 2 O 2 /t of dry ore prior to cyanidation. NaCN consumption was reduced from 0.52 to 0.40 kg/t. It is known that the presence of

Advances in the Cyanidation of Gold ScienceDirect

Figure 26.7 illustrates the benefits of using a high oxygen content in cyanidation of a gold ore with low pyrite and pyrrhotite content (Deschênes et al., 1999). A 16 ppm oxygen concentration in leaching can result in a faster dissolution rate than a 147% increase in the cyanide concentration.

MODELING OF GOLD CYANIDATION

Modeling of gold cyanidation Master of Science (Technology) Thesis 2008 93 pages, 43 figures, 9 tables and 1 appendix Figure 17 Effect of lead nitrate addition on the leaching of a gold ore with pyrite, pyrrhotite and Figure 18 Effect of lead (II) on sulfide

Cyanide Leaching Chemistry & Gold Cyanidation

The reactions that take place during the dissolution of gold in cyanide solutions under normal conditions have been fairly definitely established. Most agree that the overall cyanide equation for leaching and cyanidation of gold is as follows: 4 Au + 8 NaCN + O2 + 2

Cyanidation of a copper-gold ore ScienceDirect

A free milling gold ore, which contains 0.4% copper as chalcopyrite, was treated with cyanide. In the pre-leaching, the kinetics of oxidation of soluble sulphides are not an accurate indication for the length of the treatment. Efficient gold leaching is achieved only

Cyanidation Of A Pyrrhotite Bearing Gold Ore

Cyanidation of a pyrrhotitebearing gold ore,milling gold ore with magnetite ,the musselwhite mine in canada processes a free milling gold ore at 5558gt au and 42 pyrrhotite a laboratory,seriously reduces nor greatly enhances gold leaching pyrite, chalcopyrite

Gold recovery from a refractory pyrrhotite ore_百度文库

The gold content of the ore sample, coming from Bolivia, was of 10 g ty1 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 effects of dissolved oxygen and cyanide dosage on

Abstract The results of cyanidation of a pre-oxidized pyrrhotite-rich gold ore in laboratory leaching experiments and in plant trials are presented to highlight the effects of particle size, oxygen and cyanide concentrations during pre-oxidation and cyanidation on the

(PDF) Reactions of gold and sulfide minerals in cyanide

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

Cyanidation Of Gold Ore

2 gold cyanidation 2010-10-30gold-ore mineralogy and its relation to metallurgical treatment minerals sci engng, vol7, n 4, p 289-312 ga au gold with galena and silicates si gold is usually difficult to polish lots of scratches reflected light in optical microscope gol...

The effects of dissolved oxygen and cyanide dosage on

The results of cyanidation of a pre-oxidized pyrrhotite-rich gold ore in laboratory leaching experiments and in plant trials are presented to highlight the effects of particle size, oxygen and cyanide concentrations during pre-oxidation and cyanidation on the overall gold

The effects of dissolved oxygen and cyanide dosage on

The results of cyanidation of a pre-oxidized pyrrhotite-rich gold ore in laboratory leaching experiments and in plant trials are presented to highlight the effects of particle size, oxygen and cyanide concentrations during pre-oxidation and cyanidation on the overall gold extraction. The Multi Mix Systems (MMS) unit for oxygen injection significantly enhances the mass transfer of reagents and

cyanidation of gold ore

The Gold Cyanidation Process. The gold cyanidation process is a series of steps that vary depending on the characteristics of the deposit and the type of mine. Although not always the case, this process typically begins with mined gold ore being crushed and

Diagnostic Leaching for Refractory Gold Ores

Stage 2: Leach residue is reacted with hydrochloric acid to dissolve labile sulfide minerals such as pyrrhotite and liberate any gold that may be associated with them. The residue is then subjected to cyanidation and a sample of the residue is assayed for gold. A

crhynidation of a pyrrhotite bearing gold ore

cyanidation of a pyrrhotite bearing gold ore. 353 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

crhynidation of a pyrrhotite bearing gold ore

cyanidation of a pyrrhotite bearing gold ore. 353 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

Establishing thE ProcEss MinEralogy of gold orEs

2 # orE tyPE ModE of occurrEncE of gold ExaMPlE 1 Placers Gold is easily liberated or has been liberated prior to processing, and normally ranges from 50-100 µm in size. Witwatersrand (South Africa), Jacobina (Brazil), Tarkwa (Ghana) 2 Quartz vein-lode ores

Diagnostic Leaching for Refractory Gold Ores

Stage 2: Leach residue is reacted with hydrochloric acid to dissolve labile sulfide minerals such as pyrrhotite and liberate any gold that may be associated with them. The residue is then subjected to cyanidation and a sample of the residue is assayed for gold. A

Characterization of refractory behaviour of complex gold/silver ore

Accurate characterization of an ore is essential to identify the mode and occurrence of gold and gold- bearing minerals and hence, to evaluate the refractory behaviour of gold in the traditional cyanidation process. With this information it is then possible to[15−16].

Rcovery of gold in pyritic ores Mine Engineer.Com

However, if the ore is ground to -200 mesh, most times, a few specs of gold can be visibly seen under microscopic examination. Based upon numerous case studies, it appears that gold particles in pyrite are generally fine, ranging from 75 microns down to 2 or 3 microns.

Cyanidation of gold ores c.pdf Free Download PDF Ebook

The effects of dissolved oxygen and cyanide dosage on ceous matters (calcite) and clay minerals (illite) which had negative gold extraction from a pyrrhotite-rich ore.J.5 L/min) and mixture of H2O2 and air were employed to increase cyanidation.

Gold Recovery by Cyanide Leaching: A Case Study of Small Scale

of the ore, suggesting that the sample has a grade of 5.85 ppm (g/t) gold which is good enough for artisanal gold recovery. The ore has also high percentages of SiO 2 and other elements such as Cr, V, Sr, Zr, Pb and Ni are also present in considerable

Gold with Pyrite, Pyrrhotite, Marcasite and Arsenopyrite

Pyrite is the most stable but when pyrrhotite is present trouble is usually experienced both in regard to cyanide consumption and gold extraction. Pyritic flotation concentrates are often reground for gold liberation before cyanidation as at Itogon-Suyoc Itogon, and Pamour.

phyrrotite cyanidation effect

Cyanidation of a pyrrhotitebearing gold ore 911 Recent studies investigated the effect of pyrrhotite on cyanidation (Dunn et al., 1995; Lehmann et al., 2000). An electrochemical study indicated that pyrrhotite oxidation is much slower than the cyanidation of gold and is an unlikely reaction to significantly consume dissolved oxygen and cyanide (Dunn et

Effect of pyrrhotite reactivity on cyanidation of pyrrhotite produced by pyrolysis of a sulphide ore

Effect of pyrrhotite reactivity on cyanidation of pyrrhotite produced by pyrolysis of a sulphide ore The effect of the metal to sulphur ratio in the nonstoichiometic compound, pyrrhotite, is related to the consumption of cyanide in gold leaching. Reactive pyrrhotite (Fe(I-X

Effect of pyrrhotite reactivity on cyanidation of pyrrhotite produced by pyrolysis of a sulphide ore

Effect of pyrrhotite reactivity on cyanidation of pyrrhotite produced by pyrolysis of a sulphide ore The effect of the metal to sulphur ratio in the nonstoichiometic compound, pyrrhotite, is related to the consumption of cyanide in gold leaching. Reactive pyrrhotite (Fe(I-X

Optimizing and evaluating the operational factors affecting

The cyanidation process is affected by a number of influential parameters, such as the availability of oxygen at the solid–liquid interface, the pH and Eh of the solid–solvent suspension, the presence of ions other than CN − in solution, the cyanide concentration, the particle size of the mineral, the temperature, the surface area of gold exposed, the purity of the gold, the

cyanidation process metallurgy gold plant no

are found 2013 Gold supplier of gold ore mining plant with cyanide leaching process Application of Yufeng Gold Cyanidation The ore is comminuted using grinding machinery Contact Customer Service The Metallurgy of Cyanide Gold Leaching An

Emerging technologies in cyanidation of gold and silver: a

R&D activities in gold and silver mining have been motivated by decreasing grade of deposits, more complex mineralogy, increasing labour and energy costs Emerging technologies in cyanidation of gold and silver: a glance at some of the latest contributions AusIMM

cyanidation of gold ore

Gold mining Gold ore processing. In placer mines, the gold is recovered by gravity separation. For hard rock mining, other methods are usually used. Cyanide process. Cyanide extraction of gold may be used in areas where fine gold-bearing rocks are found. Sodium

calculations in gold cyanidation Nivelles Swimming Team

(PDF) Cyanidation of a pyrrhotite-bearing gold ore PDF 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.

Translate cyanidation in French with contextual examples

« Cyanidation of a Pyrrhotite-Bearing Gold Ore from Musselwhite Mine », Proc. Last Update: 2015-05-14 Usage Frequency: 1 Reference: Wikipedia English Cyanidation Mining only; ore

INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF GOLD AND SILVER FROM TURKISH GOLD

A study by Arslan et al. (2003) on a gold-silver ore resulted in Ag recovery increase from 45.0% to 48.9% as well as Au recovery increase, after 24 hours of cyanide leaching by

formula for concentration gold from ore with cyanide

Gold cyanidation WikipediaBy suspending the crushed ore in a cyanide solution, a separation of up to 96 percent pure gold was achieved. The process was first used on the Rand inWhat is the &formula for concentration gold from ore with cyanide solution

Diagnostic Leaching for Refractory Gold Ores

Stage 2: Leach residue is reacted with hydrochloric acid to dissolve labile sulfide minerals such as pyrrhotite and liberate any gold that may be associated with them. The residue is then subjected to cyanidation and a sample of the residue is assayed for gold. A