Separation Tests of Low-Grade Gold Ore with High Sulfur and Arsenic

Nowadays, refractory gold ore production around the world accounts for about 30% of total gold production, and the low leaching rate of such gold concentrate seriously limits the efficient utilization of gold resources. The alkaline preoxidation process can improve the leaching rate of this kind of gold deposit and has good development and application prospects. Therefore, it is of great significance to study the oxidation and dissolution behavior of pyrite in an alkaline environment. In this paper, the oxidation process of gold-bearing pyrite in an alkaline electrolyte was studied using electrochemical techniques, and the oxidation products of a pyrite electrode in an alkaline solution were characterized using XPS, SEM, and other analytical methods. The results show that the optimum pH for pyrite electrochemical oxidative dissolution is about 12, and the oxidation potential of pyrite should be above 0.8 V. In the process of alkaline oxidative dissolution of pyrite, part of the S element enters the electrolyte in the forms of Sx2−, S2O32−, SO32−, and SO42−, and a small amount of the S element is adsorbed on the surface of the electrode in the form of S0 and becomes a part of the passive layer. The Fe element is adsorbed on the surface of the electrode in the forms of Fe(OH)2, Fe2O3, and Fe2(SO4)3, which become the main components of the passivation layer. This study provides a theoretical basis and reference data for the chemical preoxidation treatment of gold-bearing sulfide ores.

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The Oxidation Pretreatment of a Sulfidic Refractory Gold Ore with Pyrolusite

Wang

2012

AMR

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An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite. The inﬂuences of various parameters were studied to optimize the conditions. The optimum leaching conditions were pyrolusite/gold ore mass ratio of 3.0, H2SO4concentration of 3.0 M, temperature of 100°C, particle size of 45μm, stirring speed of 200 rpm. After the pretreatment, gold and silver were exposed, these made the extraction of the precious metal in the gold ore much easier.

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Separation Tests of Low-Grade Gold Ore with High Sulfur and Arsenic

Cited by 3 publications

References 1 publication

Novel technology on preparation of double-layered pellets for sulfur and arsenic-bearing gold concentrates

Novel technology on preparation of double-layered pellets for sulfur and arsenic-bearing gold concentrates

Study on Electrochemical Behavior of Oxidized Pyrite in Alkaline Electrolyte

The Oxidation Pretreatment of a Sulfidic Refractory Gold Ore with Pyrolusite

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