The all sliming cyanidation method is a common method for extracting gold from low grade gold ores During the production process there are many factors that affect the efficiency and success of the whole mud cyanidation process such as ore composition ore particle size distribution cyanidation agent concentration cyanidation agent pH value and
Therefore high sulfur and high arsenic carbonaceous refractory gold ore cannot be treated effectively using cyanidation alone In this study an efficient and low toxicity method for extracting gold from a high sulfur and high arsenic carbonaceous refractory gold ore was developed using a solution of bromate and ferric chloride
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
In process IV we first treat the ore by flotation then roast the flotation concentrate and do cyanidation afterwards After all these we do a secondary cyanidation to lean liquid and tailings This process is suitable for processing ore that contains both non sulfide gold and fine grained gold encased in sulfide 3 Attentions
The successful cyanidation of gold ores containing appreciable amounts of arsenic or antimony sulphide minerals such as orpiment realgar and stibnite is usually difficult or even are low and the solutions soon become foul The gold in such ores could be free and uncoated and no trouble in dissolving it in clean cyanide solutions would be
During the experimental work the main stoichiometric conditions for leaching of the Sb 2 S 3 and the electrolytic recovery of the antimony were studied leaching solutions were submitted to electrodeposition for metallic antimony recovery Solid residues of the alkaline process have been treated by cyanidation to allow evaluation of the effect of the leaching of
This study investigated the leaching and electrowinning of antimony from a complex high arsenic and gold containing stibnite concentrate ore As Au Sb ore using slurry electrolysis SE The results indicated that the leaching efficiency of antimony was higher than 98% and those of iron and arsenic were about % and % respectively
In the treatment of gold bearing polymetallic sulfide mineral ores with high content of valuable heavy metals such as gold containing polymetallic sulphide ores containing copper copper zinc lead zinc antimony arsenic etc since these ores contain To eliminate harmful factors in order to eliminate unfavorable factors in the actual
The antimony extraction by ozone in hydrochloric acid was employed and the influences of temperature liquid/solid ratio HCl concentration and stirring speed on the extraction of antimony were investigated High antimony extraction % is achieved under the optimized conditions After the pretreatment by ozone the antimony is recovered
For antimony containing gold ore alkaline sulfide leaching is proven to be an effective and excellent pretreatment method before cyanidation Awe and Sandström 2010 This alkaline leaching can remove the harmful elements such as Sb and As which affect the cyanide leaching process increasing the gold or silver extraction rate Celep et al
It can be seen from Eq that Sb 2 S 3 is deposited on the surface of gold particles forming a dense product layer and hindering the diffusion of CN − and O 2 to the gold particles leading to low leaching ratio [3 4] Effect of Antimony on Pretreatment Process The melting point of antimony compounds generated in the roasting process of antimonial
Slurry electrolysis was also presented to extract antimony from high arsenic and gold containing stibnite ore to produce cathode metal antimony Zhang et al 2019 In general hydrometallurgical methods are more environmental friendly and can be conducted in either alkaline or acidic systems Rapid gold cyanidation from a sulfur high and
1 Introduction At present more than 35% of China s gold resources with a total amount of more than 1 000 tons are difficult to be exploited and smelted and about 700 tons of gold ores with high arsenic antimony or sulfur are difficult to be directly cyanide leached Lei et al 2016 However as the gradual depletion of easy to treat gold ore reserves the complex
Cyanidation tests on two ore samples from two different gold deposits are reported The first sample contained ppm gold with high arsenic and antimony The second sample had a low gold content
The cyanidation method is one of the main methods of gold ore beneficiation which can be divided into two categories agitation cyanidation and percolation cyanidation Agitation cyanidation is mainly used for the treatment of flotation gold concentrate or in the all slime cyanidation while percolation cyanidation is mainly used for the treatment of low grade
The ongoing depletion of gold and silver containing ore deposits demands a shift towards the processing of more complex sources Leaching of gold or silver from these sources which are named refractory and are typically low grade can be complicated due to one or more of the following effects 1 kinetic or thermodynamic impediments on cyanide diffusion or on the
A systematic review of gold extraction Fundamentals advancements and challenges toward alternative lixiviants
Cyanidation tests on two ore samples from two different gold deposits are reported The first sample contained ppm gold with high arsenic and second sample had a low gold content ppm but a high silver content 160 ppm The first series of test work focused on the determination of conditions for extracting gold from the samples
Cyanidation test on the roasted ore in optimized conditions decreased the gold and silver leaching efficiencies reached from % and % to % and % respectively
Following a successful investigation on the Central Zone sample a cyanidation study was conducted on an ore sample from the AD MW Zone of Clarence Stream Property owned by Freewest Resources
Electrum pyrargyrite acanthite and tetrahedrite were identified to be the most important silver bearing phases in the ore A flotation concentrate with a high silver grade % Ag at % silver recovery as well as high recoveries of antimony % zinc % and lead % was produced in flotation tests
The antimony extraction by ozone in hydrochloric acid was employed and the influences of temperature liquid/solid ratio HCl concentration and stirring speed on the extraction of antimony were investigated High antimony extraction % is achieved under the optimized conditions
Cyanidation is still one of the main methods of gold production due to its high recovery rate strong adaptability to ore and the ability to produce gold in situ or all slime cyanidation; while percolation cyanidation is mainly used to treat low grade gold bearing oxide ores Below we will introduce two aspects of stirring cyanation and
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