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Any experience or recommendation for maintenance the pH level in biooxidation test of refractory gold Currently the addition of limestone is precipitating the arsenic dissolved In our case the pH is controlled between 12 to 18 with a remarkable gold recovery in leaching step We use limest
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As a result the gold recovery was limited to 722 and compared to pressure oxidation method the biooxidation experiments did not yield an acceptable value According to the results obtained in this paper for this type of refractory gold ore the combination of bulk flotationpressure oxidation route is suggested as a preconcentration
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The biooxidation of a refractory goldbearing stibnite antimony sulphide favours the increase of gold recovery during the subsequent hydrometallurgical process cyanidation adsorption onto activated carbon desorption from activated carbon and electrowinning Tests were conducted at laboratory scale utilising a refractory stibnite ore
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Biooxidation is a wellestablished technology for the preoxidation of refractory goldbearing concentrates in agitated reactors as well as for the heap leaching of crushed secondary copper
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The biooxidation process has many real advantages over alternative refractory processes such as roasting or pressure oxidation These advantages include environmental friendliness low operating cost lower capital cost improved rates of gold recovery low levels of skills required for operation and so on Yang et al 2006 Sun et al 2000
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pressure oxidation refractory gold oxidation of refractory minerals SAMM Stone Crusher in Angola refractory ore gold and pretreatment 2012 refractory ore gold and pretreatment 2012 in Korea pressure oxidation refractory gold Two refractory ore minerals from Mexican sites were submitted to ozone
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SGS has developed a series of testing and mineralogy assessment protocols that allow us to determine the character of refractory gold and the mass balance between refractory and freemilling gold Once the deportment or textural associations of the gold is determined and the mass balance known flowsheet options are developed
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May be increasing gold recovery from refractory gold ore with grade 23 gt to 9095Actual data of top refractory gold ore mines show that gold recovery is 70 and less What is reason It is a problem in minerals processing or it is a global science problem So if you work with refractory ore
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REFRACTORY ORES BIOPROCESSING By performing several bioleachingbased projects we gather unique experiences in biooxidationleaching ACIDIC GRADE FLUORITE AGF With a strong background in hydrometallurgy and access to the modern equipment we can handle RD design and EPC project in gold copper zinc nickel cobalt and etc leaching
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