No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
s double refractory gold ores (DRGO) due to containing sulfide minerals and carbonaceous matter. In DRGO, the sulfide minerals (pyrite and arsenopyrite) tend to have a significant …
For double refractory gold ores, the most crucial unit operation is performed by the roaster by creating a high temperature oxidation of the ore. An efficient roasting operation creates a …
Gold ores are commonly classified by the metallurgist into two major categories: free-milling and refractory ores. Typically, free-milling ores are defined as those where over 90% of gold can …
Environmentally friendly pretreatment of double refractory gold ores (DRGO) to improve gold recovery without emitting pollutant gas is challenging. Sequential biotreatment, including iron-oxidizing microorganisms to decompose sulfides, followed by the enzymatic decomposition of carbonaceous matter, was recently developed. The effect of acid washing by …
Double refractory gold ores (DRGO) are becoming increasingly attractive as a source of gold, owing to the depletion of easier to process ores. The double refractory behavior is a consequence of the preg-robbing of dissolved Au species (Au(CN) 2 − ) by carbonaceous matter and encapsulation of the gold in sulfide minerals such as pyrite and ...
Gold ores are classified into three categories: (1) non-refractory, (2) refractory, and (3) double-refractory (Konadu et al., 2020;Lee et ... In these refractory ores, gold grains are locked in ...
Refractory gold-bearing ores: a review of treatment methods and recent advances in biotechnological techniques . × ... The effect of acid washing by 1 M HCl for 24 h between two bioprocesses was evaluated using a real double refractory gold ore from the Syama mines, Mali, which includes 24 g/t of Au and 5.27 wt% of carbon with a relatively ...
Mining metallurgists classify gold ores into two categories according to their amenability to a conventional "cyanidation-carbon adsorption" gold extraction technology: "free milling" and "refractory" (La Brooy et al., 1994).The former are those ores from which more than 90% of the gold can be extracted by simple gravity techniques or direct conventional cyanide …
DOI: 10.1016/j.hydromet.2024.106330 Corpus ID: 269862156; Complete gold extraction and recovery from double refractory gold ores by thiourea after bio-oxidation @article{Sasaki2024CompleteGE, title={Complete gold extraction and recovery from double refractory gold ores by thiourea after bio-oxidation}, author={Keiko Sasaki and Ikumi Suyama …
Properties indicative of refractory gold ores are: preg-robbing caused by carbonaceous matter (C-matter) present in the ore, gold locked in sulfide or silicate minerals, and cyanide- and oxygen-consuming matter (e.g., …
Complete extraction of Au from double refractory gold ores (DRGOs) after BIOX was achieved in 12 h by thiourea. Carbonaceous matter in DRGOs is needless to degrade …
Gold ore from the mine site is a typical double-refractory ore containing sulfide and carbonaceous matter (Lee et al., 2021). The presence of carbonaceous matter and …
Ores where gold is associated with sulfides and with high carbonaceous matter content are considered double refractory. Ores in the Carlin Trend District are characterized by the presence 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 ...
DOI: 10.1016/j.jece.2024.113997 Corpus ID: 272304072; Defining the applicable pathway of laccase pre-treatment in the bio-mineral processing of double refractory gold ores based on carbonaceous matter characterization
The use of alkaline pressure oxidation to pretreat refractory gold ore often results in insufficient gold recovery (<60%) in downstream thiosulfate leaching. To improve gold …
High-grade refractory gold reserves offer the potential for lower costs per ounce despite higher capital and operational costs. A focus on three action areas can help maximize …
In this paper, the capacity of pre-bio-oxidation can simultaneously decompose sulfides or deactivate carbonaceous matters (CM) from a double refractory gold ore (DRGO) …
In mineral processing, gold ores are commonly classified as (i) free-milling, (ii) refractory gold, and (iii) complex gold ore types, where the free-milling ore type has high gold recovery (>90% ...
According to a recent article by global consulting firm McKinsey, approximately one-quarter of the gold in geological reserves and resources can be considered refractory, with gold production from refractory ores expected to grow 1.4 % in the next four years, versus 0.3 % for non-refractory ores.
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 roasting. Very high temperatures are often required to combust some preg robbing carbon species.
Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a satisfactory gold leaching efficiency. Roasting–leaching experiments, pore structure measurements, scanning electron microscopy (SEM), and X-ray diffraction are used to explore …
WORLD GOLD CONFERENCE BRISBANE, QLD, 26 ˜ 29 SEPTEMBER 2013 1 INTRODUCTION Roasting of refractory gold ores is a well-known commercial process that has been used for many years to treat different
The refractory nature of gold ores stems from various phenomena governed by the ore's mineralogy. These include the physical encapsulation of gold within a host mineral (Cook and Chryssoulf, 1990, Marsden and House, 2006).Additionally, the passivation of gold can occur due to the coating of insoluble material (Lorenzen & Tumilty, 1992).The presence of minerals …
refractory gold can only be achieved by employing a pre-oxidation process prior to cyanide leaching. Antimony, bismuth sulfide and telluride gold ores: Antimony, bismuth sulfide and telluride gold ores are often somewhat refractory due to the presence of slow-dissolving gold minerals such as aurostibite, maldonite and gold tellurides.
The application of pressure oxidation (POX) followed by thiosulfate gold leaching is an efficient method used to extract gold from double refractory gold ores containing both …
However, refractory and double refractory ores are not easily treated by cyanidation because gold is locked within the sulfide minerals in refractory ores (Natarajan, 2018; Norgate and Haque, 2012; Vaughan, 2004). Furthermore, double refractory ores indicate preg-robbing properties caused by carbonaceous matter in the ore.
Carbonaceous sulfidic gold ores are commonly double refractory and thus require pretreatment before gold extraction. In this paper, the capacity of pre-bio-oxidation can simultaneously decompose sulfides or deactivate carbonaceous matters (CM) from a double refractory gold ore (DRGO) using pure cultures of A. ferrooxidans or L. ferrooxidans, and a …
Goldstrike Mine, where gold occurs in pyrite in refractory sulfide ore and double-refractory sulfide/carbonaceous ore, gold ores are pretreated by autoclave and roaster prior to cyanide leaching.4.5 In the JInya Carlin-type gold deposit in China, gold occurs mainly as submicroscopic gold in arsenopyrite and pyrite and is recovered by roasting
The initial results for the cyanide leach gold recoveries were very poor on a high-grade primary sulphide ore of 6.2 g/t Au with no silver. Subsequent mineralogy showed the ore to be a characteristic pyrite, carbonaceous refractory gold ore (double refractory). This was a very disappointing finding. A small scale gravity and flotation test programme was developed to …
