Pretreatment of arsenic-bearing gold ore with microwave

Jun 01, 2016 · Pretreatment of arsenic-bearing gold ore with microwave-assisted alkaline leaching Pretreatment of arsenic-bearing gold ore with microwave-assisted alkaline leaching Ma, Hongzhou; Yan, Chao; Wang, Yaoning 2016-06-01 00:00:00 In this paper, the removal of arsenic from arsenic-bearing gold ore through air oxidation and sodium hydroxide leaching with microwave irradiation was studied.

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STUDY ON MICROWAVE PRETREATMENT OF REFRACTORY

By using the heating feature of microwave, it has shown from condition tests that the gold leaching recovery can be improved from 74% to more than 90% if the gold concentrates is treated for 5 minutes in a microwave oven at 450℃. Therefore, the gold leaching recovery of cyanide residue of more than 86% can be obtained in leaching plant. The results indicate that microwave pretreatment to ...

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PDF) The treatment of arsenic bearing ores, concentrates and

As an example, when the alkaline sulfide hydrometallurgical system is applied to a common arsenic containing material like enargite, Cu 3 AsS 4 , which usually contains considerable gold, a ...

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Improvement of Gold Leaching from a Refractory Gold

A total gold extraction of 70.2% could only be reached via direct cyanidation from a refractory As-, S- and C-bearing gold concentrate calcine, and the gold extraction varied noticeably with different size fractions. The reasons for unsatisfactory gold extraction from the calcine were studied through analyses of chemical composition, chemical phase and SEM-EDS of different sizes of particles.

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Acid leaching decarbonization and following pressure

Jul 16, 2016 · Carbonate decomposition of carbonic refractory gold ore and the following pressure oxidation were studied. In the carbonate decomposition procedure, the effects of liquid-to-solid ratio and reaction time on decomposition ratio of carbonate were investigated. The experimental result shows that the decomposition ratio of carbonate is 98.24% under the conditions of liquid-to-solid ratio of 5:1 ...

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Optimizing the alkaline oxidation pretreatment of a

Sep 28, 2018 · This study investigates the alkaline oxidation pretreatment process of Zarshuran refractory gold ore. Taguchi method-orthogonal array design (OAD) is applied to evaluate and optimize the influence of five main factors including solution pH, …

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PDF Ozone: Science & Engineering Pretreatment with Ozone for

of effluents containing cyanide (Mathieu, 1977; Rowley and Otto, 1980), and on the oxidative leaching of copper ores (Roca et al., 2000). In this research work the use of ozone is proposed as oxidative pretreatment for gold and silver refractory ores with the aim of modifying the pyritic matrix and thus exposing the precious metals to cyanide.

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Developments in the pretreatment of refractory gold minerals

submicroscopic gold inclusions within sulphide minerals such as arsenopyrite and pyrite. Such ores require a pre-treatment process to alter or destroy the sulphide matrix and render the gold accessible to cyanide and oxygen (Gudyanga et al., 1999). The gold in high-sulphur and high-arsenic refractory gold concentrate (HGC) is encapsulated

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A Study on intensified alkaline leaching pretreatment

This new pretreatment method is a synthetic physical and chemiscal method .In a tower type grinding and leaching mill,the Yangshu arsenic-containing refractory gold concentrate is ground to 97.38%~33.56μm, then be intensified leaching to 12h by 144kg/t NaOH in a forced agitator tank with the pulp conc. of 40% wt at temperature of 13~15℃ and normal pressure (1atm).The arsenic particles ...

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Pressure Oxidation Pretreatment of Refractory Gold | SpringerLink

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.

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Bioleaching of Arsenic-Rich Gold Concentrates by Bacterial

In order to improve the bioleaching efficiency of arsenic-rich gold concentrates, a mixed bacterial flora had been developed, and the mutation breeding method was adopted to conduct the research. The original mixed bacterial flora had been enrichedin acid mine drainage of Dexing copper mine, Jiangxi Province, China. It was induced by UV (ultraviolet), ultrasonic, and microwave, and their ...

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Deposit in Zambia - MDPI

technology of refractory gold deposits [2,3]. The gold mineral should be pretreated before smelting due to the low grade of gold in the ore. The pretreatment process of gold mainly includes gravity separation, flotation, microbial oxidation, etc. [4,5]. Gold occurs usually in its native form or hosts in sulphides (especially pyrite, arsenopyrite,

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Ozone: Science & Engineering Pretreatment with Ozone for Gold

of effluents containing cyanide (Mathieu, 1977; Rowley and Otto, 1980), and on the oxidative leaching of copper ores (Roca et al., 2000). In this research work the use of ozone is proposed as oxidative pretreatment for gold and silver refractory ores with the aim of modifying the pyritic matrix and thus exposing the precious metals to cyanide.

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Arsenic bioleaching in medical realgar ore and arsenic

from realgar and arsenic-bearing refractory gold ore, respectively. A comparative study on arsenic leaching abilities among different treatments was discussed to investigate the efficiency of mixed cultures of four strains of A. ferrooxidans and A. thiooxidans to bio-oxidize and bioleach two kinds of different arsenic-containing sulfide ores.

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Mineralogy and Pretreatment of a Refractory Gold Deposit

According to the results of process mineralogy, the reasons for the low efficiency of beneficiation and the possibility of removing arsenic from gold concentrate are analyzed, and a suitable pretreatment process is proposed to recover the refractory gold ore reasonably and efficiently. Table 1. Chemical analysis of the raw ore (mass fraction, %).

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Bio-oxidation of Arsenopyritic and Pyritic Containing Gold

Being the most common sulfide minerals, Arsenopyrite and pyrite under oxidizing conditions breaks down to release acids of As and S into the environment, leading to acid mine drainage with high concentrations of dissolved As. In this research, the dissolution of gold ore (with FeS2 and FeAsS as the main sulfides) from Tianli gold mine, Liaoning province, China was investigated.

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Removal of arsenic and sulfur from a refractory gold

In this study the removal of sulfur and arsenic from a refractory flotation gold concentrate by microwave heating was investigated. The results showed that cooling pattern of the heated products, heating time, temperature and atmosphere had significant effect on the removal of sulfur and arsenic.

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Extraction of Gold from a Low-Grade Double Refractory Gold

The treatment process of a low-grade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work. The gold extraction of this ore by all-s cyanidation was only 11.75%. Hence, a pretreatment was necessary. In this paper, a flotation-preoxidation-cyanide leaching process was developed.

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Treatment of Refractory Gold Ores | SpringerLink

Rose and Newman's very comprehensive book, The Metallurgy of Gold, does not even contain the term refractory in its latest, fourth edition (1937). 1 Dorr and Bosqui's Cyanidation and Concentration of Gold and Silver (2d edition, 1950) has a brief chapter (XIII) on "Cyanicides and Refractory Ores," with only four pages devoted to ...

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CN100485059C - Method for recovering gold from sulphide

The invention relates to a method for recovering gold from a sulphidic concentrate, particularly one containing arsenopyrite and/or pyrite, hydro- metallurgically. The concentrate is first subjected to leaching with a concentrated solution of alkali chloride and copper (II) chloride, by means of which the copper minerals and some of the gold in the concentrate are made to dissolve.

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