refractory gold ore and pretreatment

    GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES ,, recovery from the refractory sulfide gold or An oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold The conventional methods of extraction of refractory sulfide gold ores usually follow roasting-leaching and electrowinning steps Roasting is one oxidative pretreatmentSulphidic refractory gold ore pre, Mar 01, 2013· Often, the gold bearing ores are refractory due to the gold grains and concentration by flotation is necessary, either followed by roasting, bacterial leaching, or pressure leaching in a way that the gold is liberated prior to cyanidation Two basic initial approaches are available: either treating the whole ore or processing some form of ,ECONOMICS OF REFRACTORY GOLD ORE PROCESSES, Refractory gold ore pretreatment processes continue to receive much attention This paper compares the relative economics of treating ores by oxygen pressure oxidation, roasting and bacterial oxidation with or without preconcentration by froth flotation Capital and operating cost estimates for each method of pretreatment were prepared andThe reasons of gold refractory, Gold ore classification ,, Nov 28, 2016· The reason of the gold mineral refractory There are so many types of reasons that caused the difficulty of gold ore processing, including physical element, chemical element, and mineralogical elementACID OXIDATION PRETREATMENT OF REFRACTORY GOLD ORE ,, 57 Claim 1 A process for recovering gold from refractory auri- ferous iron-containing suiphidic ore comprising: feeding ground ore as an aqueous slurry to an acidic pretreatment step, treating the ground ore in the acidic pretreatment step with aqueous sulphuric acid solution to decompose car- bonate and acid consuming gangue compounds which might other- wise inhibit a subsequent pressure ,.

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    Treatment of refractory gold: more sustainable gold ounces ,, Aug 19, 2020· This innovative solution for the treatment of refractory gold ores significantly reduces cyanide consumption, and therefore costs, in the leaching of certain bio-oxidation product residuMicrobial Pretreatment of Refractory Gold Ore, Part of refractory gold ores of gold particles with fine gold or submicroscopic gold a parcel or disseminated exist in sulfide ore and the sulfide is usually pyrite, arsenopyrite, pyrrhotite, even in some mineral deposits, most of the gold can enter the crystal lattice of pyrite, arsenopyrite, in the state of super micro gold Even if the ore ,Ozone: Science & Engineering Pretreatment with Ozone for ,, Pretreatment with Ozone for Gold and Silver Recovery from Refractory Ores F Nava-Alonso, E Elorza-Rodrı´guez, A Uribe-Salas, and R Pe´rez-Garibay CNVESTAV Saltillo, Carretera Saltillo-Monterrey km 13, Ramos Arizpe, Coahuila, Me´xico In this work ozonization was studied as pretreatment for two Mexican refractory ores in order to increase ,Sequential pretreatment of double refractory gold ore ,, Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cell-free spent medium (CFSM)from white-rot fungus Phanerochaete chrysosporium The pretreatment by A brierleyi significantly improved the gold recovery from 25% to 77%Microwave pretreatment of a double refractory gold ore ,, Sep 01, 2007· With regards to the application of microwaves to refractory gold ores, Haque, 1987a, Haque, 1987b has studied the microwave pretreatment of refractory sulphidic ores and achieved gold extractions of over 98% However, there is no information published on the microwave processing of the double refractory gold or.

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    INVESTIGATION OF THE AMENABILITY OF A COPPER, In this study, the amenability of a copper-rich gold ore (108 g/t Au, 160% Cu) to cyanide leaching was investigated Direct cyanide leaching of the ore showed that the gold extraction was very low by 184% over 24 h, indicating that the ore is highly refractory Sulphuric acid pretreatment forUS20090158893A1, The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media US20090158893A1 - Microbial pre-treatment of double refractory gold ores - Google Patents Microbial pre-treatment of double refractory gold ores Download PDF Info Publication number ,Gold recovery from refractory gold concentrates by ,, Naturally, refractory gold is enclosed by sulfide minerals such as pyrite and arsenopyrite and a higher content of organic carbon, which results in difficulty in the recovery of gold In this study, the flotation gold concentrate before and after pressure oxidation (POX) was analyzed The,MICROBIAL PRE, The result of the novel microbial pre-treatment process indicated that sulfide sulfur was degraded under alkaline conditions and carbonaceous matter passivated by T versicolor at its optimum growth conditions This led to a significant improvement in gold extraction from the double refractory gold ore and concentrate investigatedRefractory gold ore pretreatment | benefication line, Sep 12, 2013· Refractory gold ore roasting pretreatment processes are oxidation, pressure thermal oxidation, biological oxidation, chemical oxidation, and other four kinds of technology, in addition, microwave oxidation method is still in the testing stage Chemical oxidation under atmospheric pressure by adding chemical reagents for oxidation, mainly for ,.

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    Microbial Pretreatment of Refractory Gold Ore, Microbial Pretreatment of Refractory Gold Ore 2016-03-28 17:59:31 XinHai (1767) For coarse grain size of gold after crushing and grinding by flotation, gravity concentration, cyanide ,Atmospheric alkaline pre, Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold This pre-treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 throughout the test Three ,Developments in the pretreatment of refractory gold ,, Developments in the pretreatment of refractory gold minerals by nitric acid D-X LI College of Environmental Science and Engineering, China The paper covers many literature reports of processes using nitrogenous species as an oxidant for processing refractory gold ores, especially development in the pretreatment of refractory goldResearch status of carbonaceous matter in carbonaceous ,, Key words: carbonaceous gold ores; carbonaceous matter; pretreatment; bio-oxidization; research status 1 Introduction The gold ores mainly are categorized into two types: non-refractory and refractory With the increasing exhaustion of non-refractory gold ores, refractory gold ores have become main materials of the gold industry,Recovery Refractory Resources, most common pre-treatment options, and speaks to some companies that offer or use the processes A refractory gold ore is gold-containing ore that is resistant to recovery by direct cyanidation and carbon adsorption process More specifically, it is an ore that has a gold recovery rate of less than 80% when direct cyanidation is applied to it.

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    Effect of Pretreatment of Sulfide Refractory Concentrate ,, Keywords: Refractory Gold Concentrate; Hypochlorite Ox idation Pretreatment; Pressure Cyanidation 1 Introduction 11 Background Many of the gold deposits contain finely disseminated gold in iron sulfide minerals such as pyrite and arsenopy- rite Such deposits are called refractory gold ores due topretreatment of refractory ores in gold leaching process congo, Processing technologies for gold-telluride ores | SpringerLink This study deals with provided that gold is coarse enough to the alkaline sulfide leaching as an Gold ores are commonly classi- be physically and economically liber- alternative pretreatment method fied as free-milling and refractory for antimonial refractory gold and ated ores based on the metallurgical per- silver bearing orCHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF ,, For extraction of gold from the refractory ores in which gold is surrounded by sul-fide minerals, oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold Pyrometallurgical oxidation by roasting is encountered with environmen-tal limitations; thus hydrometallurgical methods are preferred These methods includePAPER OPEN ACCESS Biooxidation pretreatment of low ,, Hence, this refractory gold ore in its processing requires pretreatment methods before cyanidation Some conventional pretreatment methods such as the pre-aeration method by chlorination, roasting, pressure oxidation, ultrafine grinding, and flotation-intensive leaching are proven to be less suitable to process refractory-type gold ores ,Extraction of Gold from a Low, The treatment process of a low-grade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work The gold extraction of this ore by all-sliming cyanidation was only 1175% Hence, a pretreatment was necessary In this paper, a flotation-preoxidation-cyanide leaching process was developed.

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    ore defects from refractory, Pretreatment Process on Refractory Gold Ores with As Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding 1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with In the stones, gold is locked up in arsenic mineral matrix as the ,Process for treating refractory gold ores by roasting ,, In this work ozonization was studied as pretreatment for two Mexican refractory ores in order to increase the gold and silver extraction Two methods for contacting ozone with the mineral were ,Alkaline sulfide pretreatment of an antimonial refractory ,, This paper presents the alkaline sulfide pretreatment of an antimonial refractory gold and silver ore In the ore, gold occurs mainly as gold-silver alloys and as associated with quartz and framboidal pyrite grains, and, to a small extent, as the inclusions within antimonial sulfid Silver is present extensively as antimonial sulfides such as andorite Alkaline sulfide pretreatment was shown ,CN102560138A, The invention discloses a pretreatment method of refractory gold ore, which is characterized by comprising the following steps of: adopting a dry-wet two-level ball grinder activating and impregnation process; carrying out first-level dry grinding by adopting a vibratory ball grinder and efficiently improving the mineral activity on the basis of energy conservation through adjusting the ,Gold extraction, A "refractory" gold ore is an ore that has ultra fine gold particles disseminated throughout its gold occluded minerals These ores are naturally resistant to recovery by standard cyanidation and carbon adsorption process These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold.

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