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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 The majority of the refractory gold and silver occurs in occlusion in sulphides then precious metal dissolution is possible by first oxidizing auriferous sulfide concentrate using sodium hypochlorite-sodium-hydroxide solution followed of pressure cyanidation of the oxidized concentrate for the extraction of precious metals This process was conducted and evaluated under cyanide and oxygen
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% Metallurgical ContentGold Leaching Processing of Arsenic OreMispickel (Arsenopyrite FeAsS) 6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic antimony tellurium and
Hydrometallurgy 105 (2011) 234–239 Contents lists available at ScienceDirect Hydrometallurgy j o u r n a l h o m e p a g e w w w e l s ev i e r c o m / l o c a t e / h yd r o m e t Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach Oktay Celep İbrahim Alp ⁎ Hacı Deveci Department of Mining Engineering Karadeniz Technical PRE-TREATMENT OF A REFRACTORY GOLD SULFIDE ORE BY MEANS OF ACIDITHIOBACILLI CELLS P CHIACCHIARINI † V de la FUENTE and E DONATI‡ †Facultad de Ingeniera Universidad Nacional del Comahue Buenos Aires 1400 8300 Neuqun Argentina patchiauncoma edu ar ‡Centro de Investigacin y Desarrollo de Fermentaciones Industriales (CINDEFI-CONICET)
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 goldGold 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 form of microscopic or submicroscopic lattice
process as a pretreatment procedure of refractory sulphide gold ores and concentrates Au and Ag recovery yields after cyanidation increased up to 78 % for Au and to 83 % for Ag Keywords BIOX Au Ag recovery gold oreCharacterization of refractory behaviour of complex gold/silver ore by of such an ore and for the identification of possible pretreatment options to overcome its refractoriness prior to cyanide leaching refractory gold ore containing 5 9% pyrrhotite 0 9% pyrite 1 3% arsenopyrite and a bulk flotation
The effect of ultrasonic energy on the pretreatment and leaching of gold from the refractory ore was investigated Firstly the refractory ore was pretreated with sodium hydroxide under ultrasound mainly about the refractory gold leaching easily through arsenic removal to expose gold changing the composition physic-chemical and electro-chemical properties of the ore Currently there are four main methods of pretreatments of refractory gold ores with As Pretreatment options for deal-ing with refractory gold ores are illustrated in Fig
Sep 15 1992Types of refractory gold ore deposits that do not yield their gold values to the modified system include some pyritic ores with encapsulated gold and ores containing coarse elemental gold particles best recovered by other means The sulfiding pretreatment can be performed in various ways
Deveci Department of Mining Engineering Karadeniz Technical University 61080 Trabzon Turkey a r t i c l e i n f o a b s t r a c t The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching
An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite The inﬂuences of various parameters were studied to optimize the conditions The optimum leaching conditions were pyrolusite/gold ore mass ratio of 3 0 H2SO4 concentration of 3 0 M temperature of 100C particle size of 45μm stirring speed of 200 rpm
Figure 5 - Refractory Ore Pretreatment Options In order to choose a pretreatment option for a refractory ore the main concern is attaining a solution which succeeds in preparing the ore for cyanidation whilst remaining economically feasible Mill Sizing The ore throughput rate of a mill is largely dependent on the mining production rate