机械活化硫铁矿还原Fe³⁺反应动力学

来源期刊：中南大学学报(自然科学版)2004年第3期

论文作者：郑雅杰 彭春丽 肖忠良 陈启元

文章页码：376 - 380

关键词：机械活化;硫铁矿;硫铁矿烧渣;反应动力学

Key words：mechanical activation; pyrite; pyrite cinder; kinetics

摘    要：硫铁矿烧渣是生产硫酸时产生的固体废弃物。在50%的硫酸溶液中加入硫铁矿烧渣,于115℃反应4 h后过滤得到硫铁矿烧渣酸浸液。当酸浸液中Fe³⁺和Fe²⁺的浓度分别为2.016 mol/L和0.138 mol/L时,取酸浸液500mL,加入40 g硫精矿,在90℃下反应240 min,Fe³⁺被还原成Fe²⁺的转化率只有26.30%;加入40 g机械活化硫精矿,在90℃下反应240 min,Fe³⁺被还原成Fe²⁺的转化率达到76.75%。实验结果表明:通过机械活化,硫铁矿反应活性大大提高;机械活化硫铁矿与硫铁矿烧渣酸浸液中Fe³⁺反应符合收缩未反应芯模型,属化学控制;反应动力学方程为1-(1-x)^1/3=kt,其活化能E0为35.12 kJ/mol。

Abstract: Pyrite cinder is a kind in solidwaste in sulfuric acid industry. After adding pyrite cinders in sulfuric acid solution, acidic leaching solution of pyrite cinderswas obtained by acting at 90℃for 240 min and filtrating. The reduction ratios of Fe³⁺ to Fe²⁺ were 26.30% and 76.75% after 40 g pyrite or 40 g activated pyrite reacted with Fe³⁺at 90℃for 240 min in 500 mLsolution, respectively. The concentration of Fe³⁺and Fe²⁺ were 2.016 mol/L and 0.138 mol/L, respectively. Activity of pyrite is largely increased by mechanical activation. The reaction between activated pyrite and Fe³⁺is controlled by chemical reaction and the reaction is applicable to the shrinking core model. The kinetics equation can be expressed as 1-(1-x) ^1/3=kt and the active energyE0is 35.12 kJ/mol.