A "refractory" gold ore is an ore that has ultra fine gold particles disseminated throughout its gold occluded minerals. These ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes.
To complicate matters further, these ore bodies are often refractory, where the gold is locked within sulphide minerals; or double refractory, in which gold is locked within sulphide minerals and preg-robbing due to the presence of organic carbon. These must be pretreated ahead of leaching.
Jun 25, 2009· The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media.
material would signiﬁcantly improve gold recovery in the subsequent cyanidation step. 2. Experimental 2.1. Ore characterization Flotation concentrate was obtained from a plant that processes double refractory gold ores. The particle size was 80% passing 75 lm. Sulfur and carbonaceous matter (CM) in the samples were determined using the
[Biooxidation of a Double-Refractory Gold-Bearing Sulfide Ore Concentrate]. [Article in Russian] Bulaev AG, Kanaeva ZK, Kanaev AT, Kondrat'eva TF. The efficiency of biooxidation for treatment of a double-refractory gold-bearing sulfide ore concentrate from …
A Microbial Pretreatment for Double Refractory Gold Ores Uploaded by James Kofi Afidenyo Microbial pretreatment of a double refractory gold ore was investigated using a white rot fungus, Coriolus versicolor (ATTC 20869) to improve gold extraction.
Carbonaceous matter can also be destroyed by roasting. This is the current industry standard for simultaneously destroying the carbonaceous matter while oxidizing sulfide minerals in double refractory gold ores. This process is generally, but not always, successful and depends upon the temperature of …
A double refractory gold ore usually contains both sulfide minerals and carbonaceous matter and results in very low gold extraction. The micro-sized gold particles are enclosed inside the mineral ...
Double refractory gold ores (DRGO) contain metal sulfides that encapsulate gold and prevent its dissolution by cyanide, and carbonaceous matter (CM) that adsorbs gold cyanide complex. Pretreatment is therefore required to decompose the sulfides and liberate gold before cyanidation, and
Mar 19, 2009· Removal of TCM from unoxidized, double refractory ores has been problematic due to significant gold losses in the TCM concentrate, which renders such removal impractical. Removing TCM from oxidized sulfide products can circumvent such gold losses and reduce the preg robbing behavior of the ores.
Dec 30, 2017· In this study, microbial pre-treatment of double refractory gold ore (sample A) and concentrate (sample B) was investigated using a white-rot fungus, Tramestes. Contact Us. Recovery Refractory Resources - SGS. Sep 1, 2012 refractory resources. Refractory gold ore needs pre-treatment for cyanidation to be effective in gold recovery.
A new technology to improve gold recovery in the processing of double refractory ores, which often resulted in native carbon competing with activated carbon and limiting gold recovery – commonly ...
Refractory gold ores present a number of problems to the gold producer. Much has been written about the suitability of particular pretreatment processes for specific gold ores. We at Hazen Research have had the opportunity to participate in the development and application of a number of gold ore processes and to review others'
"It basically allows us to treat double refractory ores, lower grade double refractory ores, that would have otherwise gone through the roaster at the end of mine life," Eiselein said.
Ores in which gold is associated with sulfides and with high carbonaceous matter content are considered double refractory. The northern Nevada region in the United States is a main area where this type of ore is found.
Refractory ores are normally have either a high sulfide content that masks the gold preventing cyanide leaching of the gold, or high organic content that also block gold leaching (reabsorbs the gold), or it can have a high clay content that also soaks up the cyanide.
A two-stage bacterial pretreatment process for double refractory gold ores In the first stage, the well-known sulfide biooxidation process, which utilizes chemolithotrophic bacteria was used to oxidize sulfides and in the second stage carbonaceous matter is destroyed using the bacterium Streptomyces setonii.
Nov 05, 2018· Extraction of Gold from a Low-Grade Double Refractory Gold Ore . The treatment process of a low-grade refractory gold ore containing sulfide minerals and carbonaceous matters was Hence, a pretreatment was necessary.
of double refractory gold ores and concentrates. Currently numerous studies are in progress to further improve upon the efficiency of the bacterial process and to investigate the potential of …
The characteristics of gold ores change with time during exploitation from free-milling to refractory and double refractory gold ores. This prevents extraction of the minerals of interest in ...
Both the gold encapsulation and the carbon make recovery of the gold extremely difficult (double-refractory). To process the ore at Bakrychik once is it mined the sulfides need to be separated ...
Microwave pretreatment of a double refractory gold ore One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an alternative method and the results were compared to those obtained by conventional roasting.
Double refractory gold ores, such as Barrick's 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.
Subsequent mineralogy showed the ore to be a characteristic pyrite, carbonaceous refractory gold ore (double refractory). This was a very disappointing finding but useful in that large amounts of money were not spent drilling a problematic gold ore.
Method to improve recovery of gold from double refractory gold ores Sep 11, 2008 - Barrick Gold Corporation The present invention is directed to a precious metal recovery process in which carbonaceous material, such as preg robbing carbon, is floated after sulfide oxidation to separate the carbonaceous material from the precious metal.
Aug 10, 2017· Beijing Double Dragon International Industrial & Mining Machinery Co., Ltd. .. STA Refractory (Zhengzhou) Co., Ltd. .. Gold Supplier. ... مصادر شركات تصنيع فرن صهر الذهب وفرن صهر الذهب في refractory gold ore extraction by using vaccuum oven.
of refractory and double refractory gold ores. Commonly, in these types of ores, the gold is associated with sulphide minerals. The presence of sulphides can affect gold recovery via cyanidation due to encapsulation or passivation of the gold, thereby increasing reagent consumption. In the case of double refractory ores, gold recovery is ...
Abstract. The treatment process of a low-grade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work.