Gold in refractory ores occurs as fine-size gold-bearing sulfide minerals. In this study, the microwave-assisted roasting method has been investigated as a …
Following pretreatment, refractory gold ores are leached in order to extract gold. Currently, the leaching agents are separated into two groups: cyanide and non …
The problems during the leaching of gold show the necessity for ore pretreatment to minimize the gold entrapment with refractory minerals and solve the gold …
2.1 Microwave pre- treatment of refractory gold ores . Most of refractory gold occurs within sulphide minerals such as FeS 2 and FeAsS and are treated by roasting, pressure leaching or bacterial leaching to render the gold amenable to recovery by subsequent treatment techniques (Haque, 1987).
Introduction. Gold is a strategic mineral resource with financial attributes. China's gold consumption has remained the world's largest for consecutive years, and its production has ranked first in the world for 10 years. 1,2 However, the amount of easily exploited high-grade gold ores has rapidly decreased. Thus, the gold ore associated …
A Pretreatment of Refractory Gold Ores Containing Sulfide Minerals to Improve Gold Leaching by Ammonium Thiosulfate: A Model Experiment Using Gold Powder and Arsenic-Bearing Sulfide Minerals. Metals . 2023; 13(8):1357.
As a pre-treatment method of refractory gold ore, carbonaceous matter (C-matter) flotation was investigated with multi-stage flotation by rougher, scavenger, and cleaner stages. Different dosages ...
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 ...
Pressure oxidation pretreatment of refractory gold. Miner. and Metal. Proc. May: 1–4. Google Scholar Hedley, N., and H. Tabachnik 1957. Process for recovering precious metals from refractory source materials. ... The treatment of refractory gold ores containing carbonaceous material and sulfides. In Gold and Silver Leaching: Recovery and ...
A novel pretreatment method for refractory gold ore using ultrasound-activated persulfate was developed to overcome the low extraction efficiency of gold in …
Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cell-free spent medium (CFSM)from white-rot fungus Phanerochaete chrysosporium. The pretreatment by A. brierleyi significantly improved the gold recovery from 25% to 77%.
Keywords Tellurides · Refractory gold ore · Nitric acid · Pretreatment · Cyanidation 1 Introduction Gold is a metal that, thanks to its unique properties, has been
1. Introduction. Gold is widely used in jewelry, currency reserve and many industry fields. With large-scale gold mining, free milling resources increasingly depleted and the refractory ore will become the main resources in the future (Li et al., 2016).Refractory gold ore generally refers to ore with less than 80% cyanide leaching …
Therefore, pretreatment of arsenic-bearing refractory gold has an extremely important significance. 3) In recent years, researches are mainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physic-chemical and electro-chemical properties of the ore.
In this study, the microwave-assisted roasting method has been investigated as a pretreatment for a refractory gold ore. This method can provide rapid heating radiation, cause micro-cracks, and ...
Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion of the gold is associated with sulfides and is not amenable to conventional cyanidation. A brief review of the literature on pressure oxidation of refractory gold materials is presented. …
nite were present in the Zarshuran refractory gold ore, as can be seen in Fig. 1. The result of the elemental analysis of the sample is shown in Table I, according to which the Zarshuran refrac-tory gold ore contains 3.32 ppm Au, 1.09% As, and 0.5% sulfur. This amount of sulfur indicates that the Zarshuran refractory gold ore is a low …
Hypochlorite leaching system is a strong oxidizing solution for metal sulfides, which are naturally associated with gold extraction. This study evaluated the hypochlorite leaching of refractory gold ore by using the response surface method–central composite design (RSM-CCD) as a statistical approach in determining the optimum condition of …
Celep et al. (2015) showed that, after nitric acid pretreatment, silver associated with arsenic and lead phases in a refractory ore was recovered with 20% improvement in the overall …
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 …
Gold miners are facing a reserves crisis, and what is left in the ground is becoming more and more challenging to process.Refractory gold reserves, which require more sophisticated treatment methods in …
Abstract. Read online. The use of thiosulfate to extract gold from refractory ores is promising because of its non-toxicity and high selectivity. Sulfide minerals (i.e., pyrite, arsenopyrite, chalcopyrite), major gold carriers in refractory gold ores, however, hinder gold extraction due to the high consumption of a lixiviant.
Refractory gold ores, on the contrary, are difficult to treat and require pre-treatment prior to cyanidation. The refractoriness of gold is a consequence of ore mineralogy. ... autoclave leaching and roasting techniques for pretreatment of refractory ores are presented in Table 3 [22]. The widely studied bacteria for leaching refractory …
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. ... In this regard, the current research focuses on the pretreatment of refractory gold ore and investigates the effect of microwave power, the role of ...
As a pre-treatment method of refractory gold ore, carbonaceous matter (C-matter) flotation was investigated with multi-stage flotation by rougher, scavenger, and cleaner stages. Different dosages of kerosene and MIBC (4-Methyl-2-pentanol) were applied and the optimum dosage was selected by testing in each flotation stage. With …
Pretreatment and processing of refractory gold ore are becoming increasingly important and an inevitable trend for gold development due to the depletion of high-grade ores (Mabwe, 2020). Extraction of gold from refractory gold ore without any side reactions is a highly desirable process in the future ( Qin, Guo, Tian, & Zhang, 2021 ).
Carbonaceous refractory gold ore has been an important gold ore resource for the sustainable development of the gold industry. Solving the harmful effects of mineral-locking is the first step to increase the gold leaching rate. This study employed vacuum roasting technology in the pretreatment of carbonaceous gold ore. The dissociation ...
Roasting: This traditional refractory gold pre-treatment option uses superheated air to fluidize the ore, thereby causing the sulphides to oxidize, separate from the gold, and volatilize into sulphur dioxide (SO 2). This method is sometimes referred to as a "Chemical Liberation" process and results in a calcine product that is amenable to ...
Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion Sandra L. Mesa Espitia ⁎, Gretchen T. Lapidus Universidad Autónoma Metropolitana, Unidad Iztapalapa, Depto.
To improve gold extraction in the presence of the sulfide minerals, this study investigated the effects of the pretreatment of HAsBS ore using ammonium solutions containing cupric ions and ...
The pretreatment of carbonaceous material in double refractory gold ores (DRGO) is necessary to decrease preg-robbing of gold and maximize gold recovery. DRGO contains of carbonaceous matter and gold grains encapsulated in sulfide minerals, which typically results in very poor gold recovery.
This paper presents the results obtained by processing a gold and silver telluride mineral concentrate from a mine in Colombia. An acid wash, also known as acidification, was carried out, followed by oxidation with nitric acid as a pretreatment. Cyanidations of the pretreatment residues were carried out and the results were …
Arsenious and sulphur-bearing micro-disseminated gold ore is a kind of typical refractory Carlin-Type. The gold in Carlin-Type gold ore grains is distributed finely, existing as invisible or submicroscopic gold, encapsulated in arsenopyrite and pyrite. The technical difficulty of treatment Carlin-Type gold ore lies in how to release the fine gold …
However, pressure oxidation has been used to treat refractory gold ores or concentrates as pretreatment and subsequent cyanidation. Alkaline pressure oxidation is an effective pretreatment for releasing refractory gold from pyrite and arsenical concentrates before cyanidation [11,14]. Simultaneous pressure leaching oxidation …
In summary, the thermal activation pretreatment of refractory sulfide gold ore generates a sufficient amount of thiosulfate for environmentally friendly gold green extraction, serving as a potential alternative to traditional chemical sodium thiosulfate. Notably, this innovative clean and efficient technology prevents sulfur and arsenic from ...
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. …
Li et˛al. 2006)efore, such a gold ore is regarded as refractory. With the depletion of free-milling gold resources, the utilization of˛refractory gold ore is imminent. The treat-ment process of refractory gold deposits can be divided into pretreatment and gold extraction. The pretreatment process
Carbonaceous gold ores require pre-treatment before cyanidation and methods such as chemical oxidation, bioleaching, roasting and others can be employed (Afenya, 1991). …
