The invention discloses a pretreatment method of refractory gold ore which is characterized by comprising the following steps of adopting a drywet twolevel ball grinder activating and impregnation process carrying out firstlevel dry grinding by adopting a vibratory ball grinder and efficiently improving the mineral activity on the basis of energy conservation through adjusting the
The problem of refractory sulfide gold ore that has a gold recovery less than 50 when direct cyanidation applied still exists until now it needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore
Us8262768b2 method to improve recovery of gold from double refractory gold ores google patents method to improve recovery of gold from double refractory gold ores download pdf info publication number us8262768b2 us8262768b2
Refractory gold ore treatment methods metallurgical contentgold leaching amp processing of arsenic oremispickel arsenopyrite feass6leaching and recovering gold from antimony mineralsstibnite antimony sulphide sb2s2telluride gold ore processingsolubility of telluridesgold extraction from carbonaceous orelist gold refractory process methods where gold is associated with arsenic
Recently the us bureau of mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added to the pulp for a carboninchlorine leach cicl the objective of this research was to demonstrate the basic feasibility of cicl technology
Nov 28 2016 the reasons of gold refractory gold ore classification and preprocessing methods published on november 28 2016 november 28 2016 60 likes 9 comments
Since early 2001 kalgoorlie consolidated gold mines kcgm has successfully operated an ultra fine grinding ufg circuit to supplement its roaster capacity for the treatment of the refractory gold flotation concentrate a second ufg mill was installed in 2002 taking the total ufg capacity to over 20tph while grinding to 1112 microns and achieving over 90 gold recovery
Such ores require a pretreatment process to alter or destroy the sulphide matrix and processing refractory gold ores especially development in the pretreatment of refractory gold 61 to oxidize sulphide minerals releasing gold for recovery by conventional methods the primary advantages
Ozonation as an alternative to the existing pretreatment method for refractory ores to increase gold recoveries experimental 5 tons of ore was weighed and milled to 80 75 m passing the sample was then blended and split into 10 kg bags one 10 kg bag was split into 500 g samples and set aside for the ozonation test work
The treatment process of a lowgrade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work the gold extraction of this ore by allsliming cyanidation was only 1175 hence a pretreatment was necessary in this paper a flotationpreoxidationcyanide leaching process was developed
Pressure oxidation was selected as the most feasible processing technology for double refractory ores it is able to achieve gold recoveries of 96 by utilising high temperatures elevated pressure and oxygen to recover encapsulated gold while conventional cyanidation methods would result in suboptimal recovery rates of 2040
Refractory ore processing methods almost always serve only one purpose to treat ores that will not liberate their values by conventional cyanide leaching the refractory ore treatment process is then followed by a conventional cyanidation step refractory ore processing methods include bioleaching autoclaving pressure oxidation roasting
Currently practiced for refractory gold ores and concentrates smadmovic et al 1999 costa 1997 iglesias and carranza 1994 roasting simple stage process using fluidized bed roaster at around 650 c is one of the most common method for the treatment of gold
Refractory gold the last type of gold deposit is called refractory gold and it is the most difficult type to extract it can be defined as any ore that responds poorly to a conventional gravitycyanidation process with examples including copper porphyry complex sulfides arsenopyrite and leadzinc associations
Abstract problem ores that yield low say less than 80 gold recovery by cyanidation when normally ground are defined as refractorythe term as well as the technical methods used to treat such ores are relatively new
Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80 even after fine grinding 1 arsenicbearing 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
Recently the us bureau of mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores comparing various treatment methods in which a ground ore pulp is
Refractory sulfide gold ore provided by pt usa a smallscale gold mining in west java for experimental tests the ore sample was prepared by grinding and sieving and dried in air at room temperature for 24 hours the refractory gold ore concentrate was ground down to 74 m using laboratory ball mill and steel balls
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 and
Jun 01 2012 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
Refractory gold ore is generally defined as ore containing gold which cannot be satisfactorily recovered by conventional methods used to treat nonrefractory gold ores like gravity concentration or cyanidation cause the refractory nature of these ores can be attributed to the presence of substances that consume the cyanide reagent before it can dissolve the gold preferentially adsorb
Metallurgical contentflotationcyanide leaching with carbon or resin in pulproastingchemical oxidation flotation the simplest method of treating a carbonaceous ore is the method described by r w nice 1971 at the mcintyre porcupine mine where the carbon which contains very little gold is floated off and discarded the remaining ore is then responsive to cyanidation this does not work at
The reasons of gold refractory ore classification and preprocessing methods i 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 element in summary the difficulties consist of the following
The grade and recovery of gold in the flotation concentrates were 4944 gt and 3336 respectively the total recovery of gold was 9094 the gravityflotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold
Refractory gold ore treatment methods 2020921 metallurgical contentgold leaching processing of arsenic oremispickel arsenopyrite feass6leaching and recovering gold from antimony mineralsstibnite antimony sulphide sb2s2telluride gold ore processingsolubility of telluridesgold extraction from carbonaceous orelist gold refractory process methods where gold is associated
Double refractory gold ores such as barricks goldstrike ore contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching one possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon
Refractory gold ore treatment methods 2020625 gold extraction from carbonaceous ore the socalled graphite or carbonaceous mineral that exists in certain ores in california montana west africa and western australia has been a source of considerable difficulty in
Refractory gold ore treatment methods metallurgical contentgold leaching processing of arsenic oremispickel arsenopyrite feass6leaching and recovering gold from antimony mineralsstibnite antimony sulphide sb2s2telluride gold ore processingsolubility of telluridesgold extraction from carbonaceous orelist gold refractory process methods where gold is associated with arsenic
On the other hand refractory types of gold ores gold extraction 8590 often require some chemical andor physical pretreatment methods such as roasting dunne et al 2013 biooxidation
Refractory gold any ore that is not readily amenable to recovery by conventional cyanide leaching at a reasonable grind size can be considered refractory the three primary factors that cause gold ores to be refractory are physical encapsulation extremely fine 10 m particles are locked within an impervious unreactive mineral
Mar 01 2013 this suggests that the primary ore as a whole is highly refractory in nature and will therefore have to be processed using an appropriate refractory method 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
