(PDF) Cyanidation of a pyrrhotitebearing gold ore
Effect of lead nitrate addition on the leaching of a pyrrhotitebearing gold ore (Cyanidation: pH, 380ppm NaCN, 8ppm O 2, 32h) Figure 5 illustrates the reaction of cyanide with chalcopyrite ...
Effect of lead nitrate addition on the leaching of a pyrrhotitebearing gold ore (Cyanidation: pH, 380ppm NaCN, 8ppm O 2, 32h) Figure 5 illustrates the reaction of cyanide with chalcopyrite ...
% to % of the gold was leachable with direct cyanidation and approximately 95% of Au in ore was extracted by means of selective destruction of goldbearing minerals with nitric and sulphuric acids. TEAGUE et al[22] studied diagnostic leaching of a refractory gold ore containing % pyrrhotite, %
Jul 01, 2017· Preoxidation with H 2 O 2 prior to cyanidation increased DO from 1 up to ppm.. H 2 O 2 was injected at a rate of kg H 2 O 2 /t of dry ore prior to cyanidation.. NaCN consumption was reduced from to kg/t. • Au recovery was increased from average to %.
alternative to cyanidation for some gold bearing ore bodies. Whether the leaching is performed in stirred tank reactors or heaps, the size and type of equipment needed for a thiosulphate leaching flowsheet is very similar to a conventional cyanide leach.
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Cyanidation Of A Pyrrhotite Bearing Gold Ore. Since the 1890s, cyanide has been used to recover gold from gold bearing ores crowe zinc precipitation process and the other is the adsorption of the gold onto cyanidation of a pyrrhotitebearing gold ore gold is recovered by gravity separation prior to cyanidationyanide bearing process water, lime and lead nitrate is added.
Cyanidation of a pyrrhotitebearing gold ore . The Musselwhite Mine in Canada processes a free milling gold ore at /t Au and % pyrrhotite. A oratory investigation was conducted to improve cyanidation. The pyrrhotite was determined to be 50% monoclinic and 50% hexagonal.
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 the
PDF Cyanidation of a pyrrhotitebearing gold ore. 2019 07 12· These ores should be crushed to release the gold from the rock These are a few closeup pictures of REAL gold in quartz specimens Although the gold is nice it isn t really very showy unless it is under magnification so these .
Cyanidation of a pyrrhotitebearing 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, Box 7500,Thunder Bay, Ontario, P7B 6S8 Canada Received 30 July 2002; accepted 21 ...
the effect of copper cyanide on gold leaching from oxide and sulphide ores 110 summary 114 chapters pregrobbing phenomena in the cyanidation of gold ores 116 objectives of this chapter 116 background information 116 pregrobbing behaviour by the ores at low cyanide .
Gold extraction and cyanide consumption were 95% and kg/t. The Kupol mill was the first commercial application of the CELP. The plant processed a high grade free milling gold/silver ore containing g/t Au, g/t Ag and approximately % pyrite during 2008 operation.
Nov 01, 2017· 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 preoxidation, as is often done for pyrrhotite bearing ores.
Gold cyanidation in field scale is mainly conducted through heap leaching and tank leaching methods. The choice between alternatives depend on several factors including grade of precious metals in the ore, size of the reserve, etc. Regardless of the method selection, the liability of the Aubearing ore to cyanidation is the most critical aspect.
When gold dissolution is complete, the goldbearing solution is separated from the solids. With ores of higher gold content (greater than 20 grams of gold per tonne of ore), cyanidation is accomplished by vat leaching, which involves holding a slurry of ore and solvent in large tanks equipped with agitators.
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 ...
Gold cyanidation (also known as the cyanide process or the MacArthurForrest process) is a hydrometallurgical technique for extracting gold from lowgrade ore by converting the gold to a watersoluble coordination is the most commonly used leaching process for gold extraction.. Production of reagents for mineral processing to recover gold, copper, zinc and silver represents ...
Aug 03, 2019· The ore in Inner since excessive addition of lime the gold leaching rate by 5% to 10%; a Shandong ore Again, a certain period due to insufficient amount of addition of lime, sodium cyanide consumption multiplied by 4. 82kg / t Increase to 9. 20kg / t and so on.
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 freemilling and gold can be recovered by gravity and/or direct cyanide leaching.
Cyanidation of a pyrrhotitebearing gold ore, gold leaching kinetics and reagent consumption, this means that below the critical concentration of cyanide, gold... Know More A Kinetic Study Of Gold Leaching In CuBr
Cyanidation of a pyrrhotitebearing 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, Box 7500,Thunder Bay, Ontario, P7B 6S8 Canada Received 30 July 2002; accepted 21 ...
The use of auxiliary oxidants has been widely promoted throughout the world as the best technology for optimizing the cyanidation process. (2) The coppergold ore is leached by ammoniacyanide system, and the cyanide leaching of goldcopper ore and copperbearing concentrate will show strong vitality.
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 two purposes ...
Cyanidation Of A Pyrrhotite Bearing Gold Ore. Cyanidation of a pyrrhotitebearing gold ore gold and is an unlikely reaction to significantly consume dissolved oxygen and cyanide dunn et al, 1995 pyrrhotite is in much higher concentration than gold in a gold ore the oxygen requirement by the pulp will depend on the concentration of pyrrhotite in the ore and the degree of oxidation of its.