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·3 Refractory gold ore Refractory gold ore is a type of ore that contains gold that is difficult to extract using conventional methods It is often associated with sulfide minerals such as pyrite arsenopyrite or stibnite which can encapsulate the gold particles and prevent them from being liberated by conventional crushing and grinding
·The presence of certain species either on the surface or throughout the volume of the ore can result in the following types of refractory behavior 1 reduced ability of the leaching agent to diffuse within the mineral matrix or to dissolve target minerals Birich et al 2019 Jeffrey and Ritchie 2000 2 re adsorption of leached gold or
·refractory carbonaceous sulfide ore is at Barrick s Goldstrike Mine where gold occurs in pyrite in refractory sulfide ore and double refractory sulfidic/ carbonaceous ore These ores are pretreated by autoclave and roaster prior to cyanide leaching Thomas et al 2000; Wickens et al 2003 In the Jinya Carlin type gold deposit in China gold
·Each refractory gold ore has distinctive mineralogical characteristics which presents unique challenges during metallurgical processing Case 10 Different ore types were tested using the cyanide producing bacterium Chromobacterium violaceum Several factors were taken into consideration including particle size
·The trace element composition of magnetite in Ni Cu platinum group element PGE sulfide deposits is influenced by magmatic evolution fractional crystallization of sulfide liquid and post magmatic processes and therefore may record ore forming processes The Jinchuan Ni Cu PGE sulfide deposit in NW China contains a variety of sulfide ore types
·The second objective was to break the ore using a variety of different breakage devices to enhance the liberation of arsenian pyrite and upgrade the Au/S reach the first objective a combination of Minerals Liberation Analyser MLA image analysis methods and Laser Ablation Inductively Coupled Plasma Mass Spectrometry LA ICP MS were
·Modelling pyrite oxidation in a refractory gold ore stockpile to estimate the gold recovery via direct cyanide leaching A case study Author links open overlay panel Hang Wang a Peter A Dowd a Chaoshui Xu a b Properties of different types of materials such as pyrite content rock and pyrite particle size distributions porosity and
·The major chemical components of the sulfide refractory gold ore and pyrite are shown in Table 2 The sulfide refractory gold ore SRGO contains % Fe % S % As % Al and g/t Au The total content of Fe As and S is up to 63% of the sulfide refractory gold ore The pyrite contains % Fe and % S
·Hypochlorite leaching system is a strong oxidizing solution for metal sulfides which are naturally associated with gold extraction This study evaluated the hypochlorite leaching of refractory gold ore by using the response surface method central composite design RSM CCD as a statistical approach in determining the optimum condition of gold extraction from
·Chromium is used in several types of nonclay refractories including chrome magnesite chromite magnesite magnesia chrome and chrome alumina Chromium compounds are emitted from the ore crushing grinding material drying and storage and brick firing and finishing processes used in producing these types of refractories
·we will discuss the types of refractory lining required in a blast furnace area wise as well as the trend in the refractory lining pattern that has been observed during the last few years Furnace Refractories Now a days the campaign life of Blast Furnace is measured in terms of 10 15 yrs rather than 4 5 yrs
·Ore types and unit processes are considered along with brief descriptions of individual issues encountered and remedial actions taken or processes implemented Double refractory ore Thiosulfate leaching Commissioned ammonia free copper calcium thiosulphate leach; pH 8; resin in leach RIL ; resin stripped with sulfite/trithionate; gold
·Metso Outotec can deliver the 3 main oxidative processes for the treatment of refractory gold concentrates BIOX pressure oxidation and roasting and also supply equipment for ultra fine grinding as a fourth non oxidative treatment option Newmont USA optimized heat recovery ore preheating high capacity; Tongguan China two
·A significant contemporary challenge for gold mining companies is to define economic process options for treating more complex ore bodies as the less refractory ores become depleted
·The global approach toward growth and development of industries is driving the increase in demand for precious metals such as gold Street et al 2015; Qin et al 2023 Furthermore the global gold reserves of ore types that can be processed more facilely are becoming exhausted Oktay et al 2016 Complex ore deposits or abandoned mine waste piles
·two characteristic types of harzburgites in the Zambales ophiolite used by Philippine chromite geologists The chromitite bearing sequence of the PTO lineage is subdivided into two major subfacies containing two dif ferent types of refractory chromite ore 1 N rich refractory type chromite ores are linked with
·The roasting facility at Goldstrike Mine in Nevada was developed to process 12 000 tonnes of ore per day of double refractory ore As shown in Fig 2 the process consists of crushing dry grinding roasting and gaseous treatment circuit from roasting quenching neutralization and carbon in leach followed by carbon stripping and electrowinning []
·The recovery of gold from refractory ore could guarantee sustainable development in the gold industry However there are many challenges in the treatment of ore such as environmental pollution and low recovery ETU as ligands from three types of gold ores with different Fe contents from to wt% under the acidic condition The
·Due to cyanide s inefficiency with some refractory ore types the decrease in free milling ore also increases the need for thiosulfate leaching Thiosulfate lixiviants can be used for various
·The world s gold reserves originating from non refractory ore are 906 million troy ounces while refractory ore reserves are 288 million troy ounces with production growth in the 2015 2019 period of % and % respectively Motta et al 2021 Gold production from refractory gold ore has increased due to the depletion of free milled gold ore Msumange et
2 ·However when it comes to separating gold from refractory gold ore or other minerals the industry faces a problem Procedures like heap leaching or sodium cyanide solutions must be employed to dissolve gold into soluble complexes for recovery requiring meticulous control and significant expertise Gold Ore Types and Gold Processing
·The purity bulk density microstructure and lime silica ratio of magnesia have a significant effect on its quality Previous studies have investigated the microstructure of periclase sintered from European American and Indian varieties of magnesite [17 18] as well as magnesia from seawater [19] However the microstructure of Liaoning variety magnesite
