摘要
Gold bearing pyrite leaching was conducted in H2SO4-Fe2（SO4）3 system at different reaction temperatures,with different ferric ion concentrations,sulfuric acid concentrations and stirring speeds.The leaching kinetics and mechanism were studied.When the temperature ranged between 30-75 °C,the pyrite leaching was mainly controlled by chemical reaction with positive correlation to the ferric ion concentration.The activation energy obtained from Arrhenius empirical formula is 51.39 k J/mol.The EDS and XPS analyses suggest that the oxidation of sulfur within pyrite is through a series of intermediate stages,and eventually is oxidized to sulphate accompanied with the formation of element sulfur.This indicates a thiosulfate oxidation pathway of the gold bearing pyrite oxidation in H2SO4-Fe2（SO4）3 system.
在H2SO4-Fe2（SO4）3体系中研究载金黄铁矿的浸出动力学,探讨反应温度、Fe3＋浓度、硫酸浓度、搅拌速度等对黄铁矿浸出的影响规律。结果表明：在H2SO4-Fe2（SO4）3体系中,在30~75°C下黄铁矿浸出过程主要受化学反应控制Fe3＋浓度与黄铁矿的浸出呈正相关,通过Arrhenius经验公式求得浸出表观活化能为51.39 k J/mol。EDS与XPS分析结果表明：黄铁矿氧化过程中硫的氧化经一系列中间形态,最终被氧化成硫酸根,并伴有部分元素硫生成,符合硫代硫酸根氧化路径机理。
基金
Project(51474075)supported by the National Natural Science Foundation of China
