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本文研究了盐酸溶液中用过氧化氢氧化黄铁矿的动力学。对搅拌速度、温度、颗粒尺寸及过氧化氢浓度和盐酸浓度的影响做了系统研究,并对添加的H~+、Cl~-的影响也做了考察。氧化动力学研究表明该溶解过程遵循表面化学反应为速率控制步的收缩核模型。这与反应活化能为65KJ/mol及化学速率常数与颗粒半径的倒数成线性关系一致。对应于过氧化氢浓度其反应级数为1.32。随盐酸浓度的增加黄铁矿的氧化速率下降,很可能是因为cl~-离子吸附在黄铁矿颗粒表面。H~+离子对氧化速率没有影响,而Cl~-离子对反应速率的影响与盐酸的影响相似。
In this paper, the kinetics of pyrite oxidation using hydrogen peroxide in hydrochloric acid solution was studied. The effects of stirring speed, temperature, particle size, hydrogen peroxide concentration and hydrochloric acid concentration were systematically investigated and the effects of added H ~ +, Cl ~ - were investigated. Oxidation kinetics studies show that the dissolution process follows the shrinkage kernel model of the rate control step for the surface chemical reaction. This is consistent with the reaction activation energy of 65 KJ / mol and the reciprocal of chemical rate constant and particle radius. The reaction order corresponding to hydrogen peroxide concentration was 1.32. With the increase of hydrochloric acid concentration, the oxidation rate of pyrite decreases, probably due to the adsorption of cl ~ - ions on the surface of pyrite particles. The H ~ + ion had no effect on the oxidation rate, but the effect of Cl ~ - ion on the reaction rate was similar to that of hydrochloric acid.