Kinetic modeling of the decomposition of beudantite in NaOH medium
Kinetic modeling of the decomposition of beudantite in NaOH medium
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DOI：
10.1007/s11144-016-1065-y
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发表时间：
2016-08
期刊：
影响因子：
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通讯作者：
F. Patiño;Mizraim U. Flores;I. Reyes;S. Ordóñez;J. Eliecer Méndez;Víctor H. Flores;Hernán Islas;Martín Reyes
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文献类型：
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作者：
F. Patiño;Mizraim U. Flores;I. Reyes;S. Ordóñez;J. Eliecer Méndez;Víctor H. Flores;Hernán Islas;Martín Reyes
本文研究了在较宽的实验条件下，褐锰矿在氢氧化钠介质中的反应。固体的部分分解表明存在未反应的褐铜矿核心、反应前沿和由氢氧化铁和铅组成的无定形分解凝胶的晕环，硫酸盐和砷离子通过该凝胶扩散到介质中，而介质中的氢氧化物离子通过凝胶扩散到球状粒子的核心上。研究了反应速率与(OH−1)浓度、温度和粒度的关系，以确定博丹石分解过程的反应级数和活化能。对比研究了包丹铜矿和其他砷黄钾铁矾矿碱解的实验速率常数。
This piece of work presents a study on the reaction of beudantite in NaOH medium under a wide range of experimental conditions. The partial decomposition of solids indicates the presence of an unreacted beudantite core, a reaction front and a halo of amorphous decomposition gel made of iron hydroxides and lead, through which sulfate and arsenate ions diffuse from the beudantite into the medium, while hydroxide ions from the medium diffuse through the gel onto the core of spherical particles of beudantite. We studied the dependence of the reaction rate on (OH−1) concentration, temperature and particle size in order to determine the reaction order and activation energy of the decomposition process of beudantite. A comparative study on the experimental rate constants of the alkaline decomposition of beudantite and other arsenic jarosites was conducted.