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A new gold bearing sulfide ore br31 new is ground to p 80 less than 70 microns.The pox-cil recovery was similar to that shown in table 3.The pox discharge was treated using a two stage flotation process consisting of rougher and cleaner flotation circuits, wherein a portion of the preg-robbing tcm is concentrated, as shown in figs.
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Pressure oxidation was selected as the most feasible processing technology for double refractory ores.It is able to achieve gold recoveries of 96 by utilising high temperatures, elevated pressure and oxygen to recover encapsulated gold, while conventional cyanidation methods would result in sub-optimal recovery rates of 20-40.
Pressure oxidation allows to carry out the efficient processing of goldbearing sulfide materials.However, application of this method for processing of double refractory raw materials leads to irreversible gold losses due to autoclave preg-robbing of gold by organic carbon.Thermodynamic and experimental data indicate that almost complete sulfide decomposition leads to a high value of.
It is beneficial to maintain excess sulfuric acid in the autoclave, in order to promote oxidation and prevent preg-robbing phenomena marchbank et al.1996 fleming et al.Currently, cyanidation is the predominant process for gold leaching.
Abstract a process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave.The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a.
Autoclave leaching of refractory gold ores on an industrial scale started in the 1980s because of the high gold price and because pressure oxidation is an environmentally accepted alternative to roasting since 1985 about five autoclave leaching plants have been.
Preg-robbing material can be deactivated prior to leaching by the addition of kerosene or diesel or similar blinding agents.Cyanicides cyanide is an aggressive compound, and will react and be consumed by a number of mineral species other than gold species known as cyanicides.
Pressure oxidation is also not an obvious choice in these situations, as the carbonaceous material has the potential to become even more active as an adsorbent for gold cyanide after this treatment the effect of preg-robbing can be partially overcome by the use of cil rather than cip, provided the activated carbon used in cil is more active.
The cil residue was analysed for possible losses due to preg-robbing of gold from the cyanide solution onto carbonaceous material present in the sample.Objectives detection speciation of different forms of surface gold preg-robbed on carbonaceous matter metallic gold au and gold compounds aucn 2 , auscn 2 by tof-sims.
Application of the process to preg-robbing gold ores, and to silver ores, is also briefly discussed.Methods of recovering the gold from the platsol liquors are examined.Development of the platsol process.Fundamentals pressure oxidation has been used.Commercially since 1985 to pretreat refractory gold ores prior to cyanidation 10.
Gold ore processing project development and operations, second edition, brings together all the technical aspects relevant to modern gold ore processing, offering a practical perspective that is vital to the successful and responsible development, operation, and closure of any gold ore processing operation.This completely updated edition features coverage of established, newly implemented.
The loaded gold, analyzed by xps was found to be 23 metallic and 13 auicl.Because of a preg-robbing effect exhibited by hematite forming in-situ, excess sodium was added to the system favouring natrojarosite as the latter has no affinity for gold.In this way gold loading on carbon was maximized.
Gold recovery can be adversely affected by pregrobbing on inherent carbonaceous material during autoclave pressure oxidation of sulphide ores.The time of flight tof sims tofsims technique has been applied for direct determination of gold species on individual carbonaceous particulates from ac pox stream samples.
Flotation, pressure oxidation, ok 300m3 float cells, fine grinding with isa mill and preg-robbing management process availability maintained at 95 for 10 years.Autoclave availability of 95 since commissioned in 1999.Planned versus unplanned downtime better than 80 mill throughput of 5.8 mtpa with a dual train sagball mill circuit.
Determine the preg-robbing nature of the ore, since significant variation exists in the preg-robbing be-havior of carlin trend carbonaceous ores 7.Onewx simple method used by bgmi is a apreg-robbingb test.In the preg-robbing test, a percent preg-robbing value pr is.
Briefly, therefore, the invention is directed to a process for recovering gold by forming an aqueous ore slurry comprising a refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon and subjecting the ore slurry to pressure oxidation in an autoclave to produce an oxidized ore.
3 oxidized ores gold usually occurs as either liberated or in the alteration products of sulfide minerals, and the degree of gold liberation is generally increased by oxidation pierina peru, yanacocha peru, yilgarn region australia 4 silver-rich ores gold commonly occurs as electrum, although kustelite may be present in some ores.
Iodide pressure oxidation gold leaching - autoclave.The authors of this study have recently applied pressure leaching with iodide to refractory gold ores, a technique developed as a noncyanide process for refractory gold ores.This new process is a one stage operation, where the oxidation of sulfide and the dissolution of gold are.
Characterization, diagnostic leach tests, and preg-robbing tests.Material and methods mineralogical characterization, dlt, and adsorption tests were performed to study the gold distribution and preg-robbing, using four samples taken from the mill carbon in leach cil tailings at the kittil mine in finland oxidized tailings.
A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave.The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a ph between 7 and 8.7 while the slurry is agitated in a.
Preg-robbing gold ores chapter | 49 889 lixiviants have been reported aylmore, 2005 that may be applicable to preg-robbing gold ores, including the alkaline sulde system anderson et al., 2005, the electrochemistry of the thiourea system parker and hope, 2008, and the halogens.
The gold unresponsive to cyanidation but because it readily absorbs gold in solution and leads to pregrobbing.When these refractory contributors present themselves in combination, obtaining satisfactory gold recoveries can prove a real headache.Fortunately there are cures.Key to curing the.
A double refractory gold ore contains gold particles locked in sulphides, solid-solution in arsenopyrite, and preg-robbing material such as carbonaceous matter, and so on.The diagnostic leach test dlt and preg-robbing pr approaches are widely used to investigate the occurrence and the distribution of refractory gold.Dlt serves to qualitatively evaluate the gold occurrences within the ore.