Mechanism and kinetic control of the oxyprecipitation of sulphuric liquors from steel pickling

被引：18

作者：

Dufour, J ^{[1
]}

Marron, JO ^{[1
]}

Negro, C ^{[1
]}

Latorre, R ^{[1
]}

Formoso, A ^{[1
]}

Lopez-Mateos, F ^{[1
]}

机构：

[1] Univ Complutense Madrid, Fac Chem Sci, Dept Chem Engn, Madrid 28003, Spain

来源：

CHEMICAL ENGINEERING JOURNAL | 1997年 / 68卷 / 2-3期

关键词：

mechanism; kinetics; oxidation; precipitation; iron oxides;

D O I：

10.1016/S1385-8947(97)00093-4

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Steel pickling liquors are one of the main environmental problems of steel making. Currently, there are several processes for the treatment of sulphuric liquors, although most recover only acid and haematite (alpha-Fe2O3). We propose an oxyprecipitation process for this recovery, allowing several kinds of iron oxide or oxyhydroxide to be obtained. The aim of this paper is to determine the kinetic control and reaction mechanism. The influence of different variables is evaluated and two experimental ranges for the synthesis of goethite (alpha-FeOOH) and magnetite (Fe3O4) are defined. A systematic study is carried out in these experimental intervals, and the results are analysed in order to determine the reaction order and the type of kinetic control. Finally, from these data, morphological and crystallinity studies and new experiments, the reaction mechanism is proposed. (C) 1997 Elsevier Science S.A.

引用

页码：173 / 187

页数：15

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