硝酸“催化”分解黄铁矿的动力学研究

来源期刊：中南大学学报(自然科学版)1993年第6期

论文作者：刘志宏 严晓晖 蒋荣英 张多默 陈慧光 葛荣德

文章页码：760 - 765

关键词：黄铁矿; 硝酸; 浸出; 动力学; 数模

Key words：kinetics; leaching; pyrite; nitric acid; mathematical model

摘    要：本文在333～363K,硝酸根 浓度0.1～0.5mol/L的条件下,实验研究了常氧压下硝酸“催化”分解黄铁矿的动力学。结果表明,黄铁矿分解后其中所含硫主要转化为硫酸根,浸出过 程受化学反应控制,符合收缩未反应核模型,其表观活化能为39.87kJ/mol。根据实验结果推导出浸出速率的数学模型为: 1-(1-α)^1/3=6.30×10²C_NO3^0.83·C_H^0.81·r₀^-1·exp(-39.87×10³/RT)t

Abstract: The leaching of pyrite catalyzed by nitric acid at normal oxygen pressure has been inves-tigated in the temperature range 333 to 363 K. It was observed that almost all the pyrite sul-fur was converted to sulfate in the leaching processes, and chemical reaction at the mineralsurface was rate controllong. The activation energy of the leaching reaction was determinedto be 39.87 kJ/mol. A mathematical model was developed on the basis of unreacted shrinkingcore model to explain the leaching rates.