Thermodynamic Behavior of Pyrite and Arsenopyrite in Preoxidation for Chlorination Leaching of Refractory Gold Concentrate

IF 2.8 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of Chemistry Pub Date : 2024-01-10 DOI:10.1155/2024/2671023

Chang Sok Kim, Un Chol Han, Hyok Sin, Su Rim Hwang, Jong Min Wang

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Abstract

Recently, preoxidation is an effective pretreatment method of refractory gold ore, which has been widely used due to the high desulfurization, arsenic removal, low environmental pollution, and rapid reaction rate. In this paper, we describe the thermodynamic considerations of preoxidation of pyrite and arsenopyrite, the main minerals of the refractory gold ore, and the effect of the pressure oxidation, one of the preoxidation processes on the chlorination leaching. The thermodynamic results indicated that arsenopyrite under acidic conditions is easier to oxidize compared to pyrite and the oxidation decomposition of pyrite and arsenopyrite-type gold ore can be considered mainly for pyrite. The experiment has shown that the arsenic removal rate was higher than the desulfurization rate; it is confirmed that the thermodynamic conclusion of the oxidation of pyrite and arsenopyrite was correct. Comparing the XRD, SEM, and EDX analyses of gold concentrate and pressurized oxidation residue, it can be seen that the surface of pressurized oxidation residue is a fine porous structure and the dense and durable structure of sulfide ore is mainly destroyed.

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难处理金精矿氯化浸出预氧化过程中黄铁矿和黄铜矿的热力学行为

近年来，预氧化法是一种有效的难选金矿石预处理方法，因其脱硫、脱砷率高，环境污染小，反应速度快而得到广泛应用。本文阐述了难选金矿主要矿物黄铁矿和黄铜砷矿预氧化的热力学考虑，以及预氧化过程之一的压力氧化对氯化浸出的影响。热力学结果表明，与黄铁矿相比，砷黄铁矿在酸性条件下更易氧化，黄铁矿和砷黄铁矿型金矿的氧化分解可主要考虑黄铁矿。实验表明，砷的脱除率高于脱硫率，证实黄铁矿和砷黄铁矿氧化的热力学结论是正确的。对比金精矿和加压氧化残渣的 XRD、SEM 和 EDX 分析可知，加压氧化残渣表面为细孔结构，硫化矿致密耐久的结构主要被破坏。

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来源期刊

Journal of Chemistry CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

5.90

自引率

3.30%

发文量

345

审稿时长

16 weeks

期刊介绍： Journal of Chemistry is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles in all areas of chemistry.