MICROWAVE IRRADIATION PRETREATMENT OF A …
Microwave energy was applied in the pretreatment of a typical refractory arsenopyritic gold concentrate. More than 80% of As and S were volatilized off as As 2 …
Microwave roasting of a carbonaceous sulphidic gold concentrate
Pretreatment using microwave-assisted roasting with NaClO 3 as an additive to the oxidizing agent is a new method of processing refractory gold ore. Oxidation was studied through sulfur and chlorine mass balance analysis and the degree of metal extraction from sulfide minerals.
A clean and efficient innovative technology for refractory sulfide gold
Green non-toxic extracting gold from refractory sulfide gold ore using thiosulfate is an essential guarantee for the sustainable development of the gold industry. However, there are many bottlenecks, including environmental pollution from traditional pretreatment of sulfide gold ore and high consumption of chemical thiosulfate.
Microwave roasting of a carbonaceous sulphidic gold concentrate
Microwave roasting could find application in the minerals industry as a pretreatment method for refractory gold concentrates. Many processing plants, where refractory gold ores are treated, incorporate a flash flotation system where coarse flotation is done and the flash concentrate is milled further in a regrind circuit.
Oxidation of sulfide mineral and metal extraction analysis in …
Pretreatment using microwave-assisted roasting with NaClO 3 as an additive to the oxidizing agent is a new method of processing refractory gold ore. Oxidation was studied through sulfur and chlorine mass balance analysis and the degree of metal extraction from sulfide minerals.
Mineral Phase Evolution during Oxidation Roasting Pretreatment …
Oxidation roasting pretreatment is the most common pretreatment approach to treatment refractory gold ores [13,14,15,16,17]. To achieve good recoveries in subsequent leaching, the majority of the sulfur and organic carbon has to be oxidized to SO 2 and CO 2 ; the arsenic of ore has to be transformed to the volatile trivalent compound.
Recovery of Gold from the Refractory Gold …
The leaching efficiencies of metal ions (As, Cu, Zn, Fe, and Pb) and recovery of gold from refractory gold concentrate were …
Recovery of gold from sulfide refractory gold ore: Oxidation …
Following pretreatment, refractory gold ores are leached in order to extract gold. Currently, the leaching agents are separated into two groups: cyanide and non-cyanide reagents. ... Pretreatment using microwave-assisted roasting with NaClO 3 as an additive to the oxidizing agent is a new method of processing refractory gold ore. …
Pretreatment Process on Refractory Gold Ores with As
The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold. Statistics show that, in the world, about 2/3 gold resource belongs to the difficult processing ores, and about 1/3 total output of world gold is produced from refractory gold. ... Kyuesi and Haque, etc. have studied the role of microwave in ...
Microwave Pretreatment for Thiourea Leaching for Gold Concentrate
Abstract and Figures. In this research, we studied the use of microwave pretreatment to enhance the efficiency of Au leaching from gold concentrate. The gold concentrate was pretreated using ...
Recovery of Gold from the Refractory Gold Concentrate Using Microwave
liberation of gangue minerals on the sulfide surface. The recovery rate of gold in the leach residue. was improved with microwave-assisted leaching, with a gold recovery of ~132.55 g t after 20 ...
Microwave Pretreatment for Thiourea Leaching for Gold …
In this research, we studied the use of microwave pretreatment to enhance the efficiency of Au leaching from gold concentrate. The gold concentrate was pretreated using microwaves with different irradiation time. The sample temperature was increased up to 950 °C by the microwave irradiation. A scanning electron microscope-energy …
Pretreatment of a refractory arsenopyritic gold ore using …
An arsenopyrite refractory ore was pretreated with NaOH to increase gold extraction. •. After pretreatment, gold and silver were leached with copper ammonium thiosulfate solution. •. Thiosulfate leaching of the as-received ore extracted only 21% and 29% of silver and gold, respectively. •.
Leaching of Refractory Gold Ores by Microwave Irradiation …
The present paper attempts to assess the effects of microwave irradiation on the leachability of refractory gold ores. Characteristics of the crystal structure and microstructure of the ores were determined by x-ray structural analysis (XRD) and scanning electron microscopy (SEM) before and after microwave irradiation. Compared to …
Optimizing the alkaline oxidation pretreatment of a refractory gold …
Microwave pretreatment: ... Biooxidation (BIOX) pre-treatment of refractory gold concentrates using mixotrophic and chemolithotrophic bacteria on the gold extraction during cyanidation indicated 91.4% gold could be extracted by mixotrophic bacteria for 14 days, and it was 18% higher than the extraction level of direct cyanidation …
Research on leaching of carbonaceous gold ore with copper …
The effect of microwave roasting pre-treatment on gold extraction was examined. The gold extraction increased to 90% after the ore was microwave roasted for 30 min at 500 °C. ... Yang et al., 2013). Roasting is one of the most effective pretreatment methods for refractory gold ores. The recovery of gold from refractory carbonaceous …
MICROWAVE IRRADIATION PRETREATMENT OF A REFRACTORY GOLD …
Microwave energy was applied in the pretreatment of a typical refractory arsenopyritic gold concentrate. More than 80% of As and S were volatilized off as As 2 O 3 and SO 2; whereas iron was oxidized mostly to hematite (Fe 2 O 3).All the gold was present in the calcine which responded favourably to the conventional alkaline …
Microwave Pretreatment for Thiourea Leaching for Gold …
In this research, we studied the use of microwave pretreatment to enhance the efficiency of Au leaching from gold concentrate. The gold concentrate was pretreated using microwaves with different irradiation time. The sample temperature was increased up to 950 °C by the microwave irradiation. A scanning electron microscope-energy dispersive …
Study on pretreatment of refractory gold ore by microwave …
Microwave roasting method was applied for the pretreatment of refractory gold ore (RGO). The occurrence, phase of gold and microstructure of roasted product were analyzed. The results showed that ...
Microwave pretreatment of a double refractory gold ore
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. In this research, microwave roasting of a double refractory gold …
Optimizing the alkaline oxidation pretreatment of a …
Optimizing the alkaline oxidation pretreatment of a refractory gold ore using taguchi orthogonal array method. Foad Mahmoodi1 and Asghar Azizi1. Published 28 …
Microwave pretreatment of a double refractory gold …
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 …
Oxidation of sulfide mineral and metal extraction
Request PDF | On Nov 1, 2023, Abdul Hapid and others published Oxidation of sulfide mineral and metal extraction analysis in the microwave-assisted roasting pretreatment of refractory gold ore ...
Evaluation of pre-treatment methods for gold recovery from refractory …
Mechanical (ultra fine grinding P 80 -16µm) and chemical (alkaline, NaOH) pre-treatment and microwave roasting and microwave-assisted cyanide leaching were investigated to increase gold recoveries. Ultrafine grinding was the most effective, producing recoveries of 66.5%. NaOH pre-leaching of ultrafine milled material increased recovery to 71.5%.
Pretreatment of arsenic-bearing gold ore with microwave …
Microwave-assisted leaching, as a clean and efficient method of strengthening leaching, has been used in the pretreatment of complex and refractory ores such as chalcopyrite [ 14, 15 ], nickel laterite [ 16, 17 ], and sulfide concentrates [ 18 ]. In this paper, the removal of arsenic from arsenic-bearing gold ore through air oxidation and ...
Microwave pretreatment of a double refractory gold …
Abstract. 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 …
Extraction of Gold from a Low-Grade Double Refractory Gold …
B. Nanthakumar, C. A. Pickles, and S. Kelebek, "Microwave pretreatment of a double refractory gold ore," Minerals Engineering, 20 (11) (2007), ... "A mechanism study on technology of pretreatment of refractory gold ores by alkaline hot-pressure oxidation," Rare Met, 02 (2003), 249–253. Google Scholar
Microwave roasting of flash flotation concentrate …
Pretreatment using microwave-assisted roasting with NaClO 3 as an additive to the oxidizing agent is a new method of processing refractory gold ore. Oxidation was studied through sulfur and chlorine mass balance analysis and the degree of metal extraction from sulfide minerals.
Extraction of gold from refractory gold ore using bromate …
DOI: 10.1016/J.MINENG.2019.02.037 Corpus ID: 109159359; Extraction of gold from refractory gold ore using bromate and ferric chloride solution @article{Wang2019ExtractionOG, title={Extraction of gold from refractory gold ore using bromate and ferric chloride solution}, author={Qiang Wang and Xianzhi Hu and Futing Zi …
Recovery of gold from sulfide refractory gold ore: Oxidation …
DOI: 10.1016/J.MINENG.2021.106822 Corpus ID: 233530449; Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold extraction @article{Qin2021RecoveryOG, title={Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold extraction}, author={Hong Qin and Xueyi …