Kinetic Modeling of the Alkaline Decomposition of Potassium Arsenojarosite

被引：16

作者：

Flores, Mizraim U. ^{[1
]}

Patino, Francisco ^{[1
]}

Reyes, Ivan A. ^{[1
]}

Rivera, Isauro ^{[1
]}

Reyes, Martin ^{[1
]}

Juarez, Julio C. ^{[1
]}

机构：

[1] Univ Autonoma Estado Hidalgo, Ctr Invest Mat & Met, Mineral De La Reforma 42184, Hidalgo, Mexico

来源：

JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY | 2012年 / 23卷 / 06期

关键词：

potassium arsenojarosite; alkaline decomposition; kinetic modeling; activation energy; reaction order; JAROSITE PRECIPITATION; AMMONIUM JAROSITE; CYANIDATION; REMOVAL; BEHAVIOR;

D O I：

10.1590/S0103-50532012000600004

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A sample of potassium arsenojarosite was synthesized and thoroughly characterized. The obtained sample is a solid solution of potassium arsenojarosite, whose approximate formula is [K-0.75(H3O)(0.25)]Fe-1.84[(SO4)(1.82)(AsO4)(0.18)][(OH)(2.34)(H2O)(3.66)]. The decomposition process in alkaline medium was studied in the induction and progressive conversion periods, and the reaction order and activation energy were determined for each case. Under the used experimental conditions, results are consistent with the spherical particle model with decreasing core and chemical control. In both processes, four partial models and two global models were developed in order to describe their basic behavior. The models were validated, and it was proved that they favorably describe the decomposition process in alkaline medium.

引用

页码：1018 / 1023

页数：6

共 21 条

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