中南大学学报（自然科学版）2025，Vol.56Issue(1)：1-10,10.DOI:10.11817/j.issn.1672-7207.2025.01.001
砷黄铁矿生物氧化热力学分析
Thermodynamic analysis of bio-oxidation of arsenopyrite
摘要
Abstract
Bio-oxidation is regarded as one of the most promising methods for pretreating various As-containing gold ores.However,due to the formation of passivating products on the surface of arsenopyrite(FeAsS)which is the predominant auriferous mineral in As-containing gold ores,and the issues of slow rate and long periods of bio-oxidation,the large-scale industrial application of this bio-oxidation technology are severely impeded.To solve these problems,a series of thermodynamic calculations were employed to analyze the oxidative dissolution and passivation behavior of FeAsS.The results show that under acidic conditions(pH=0-3)the intermediate passivating products of As2S2,As2S3,and S0 are inevitably formed from the oxidation of FeAsS at E scale of-0.4 V to 0.2 V(pH=3)or 0.4 V(pH=0).These passivating products can be unstable by increasing E(>0.2 V(pH=3)or>0.4 V(pH=0));at this time,the Fe precipitates can be formed,of which H3OFe3(SO4)2(OH)6 and FeO∙OH are most likely to be formed from the FeAsS oxidation.Therefore,the solution potential should be controlled not to be too high or the total sulfur concentration of the system should be minimized to avoid the formation of Fe-containing passivation products.This thermodynamic analysis can provide theoretical guidance for the efficient biological oxidation of arsenopyrite.关键词
含砷金矿/砷黄铁矿/生物氧化/钝化产物/热力学分析Key words
as-containing gold ore/arsenopyrite/bio-oxidation/passivating product/thermodynamic analysis分类
矿业与冶金引用本文复制引用
李骞,韩雨琪,张雁,杨永斌,姜涛..砷黄铁矿生物氧化热力学分析[J].中南大学学报（自然科学版）,2025,56(1):1-10,10.基金项目
国家重点研发计划项目(2023YFC2907801) （2023YFC2907801）
湖南省科学技术厅自然科学基金青年基金资助项目(2023JJ40760)(Project(2023YFC2907801)supported by the National Key Research and Development Program of China （2023JJ40760）
Project(2023JJ40760)supported by the Natural Science Youth Foundation of Hunan Province) （2023JJ40760）
