Kinetics of steel slag leaching: Batch tests and modeling

Waste Management
Laurent De WindtJérôme Rose

Abstract

Reusing steel slag as an aggregate for road construction requires to characterize the leaching kinetics and metal releases. In this study, basic oxygen furnace (BOF) steel slag were subjected to batch leaching tests at liquid to solid ratios (L/S) of 10 and 100 over 30 days; the leachate chemistry being regularly sampled in time. A geochemical model of the steel slag is developed and validated from experimental data, particularly the evolution with leaching of mineralogical composition of the slag and trace element speciation. Kinetics is necessary for modeling the primary phase leaching, whereas a simple thermodynamic equilibrium approach can be used for secondary phase precipitation. The proposed model simulates the kinetically-controlled dissolution (hydrolysis) of primary phases, the precipitation of secondary phases (C-S-H, hydroxide and spinel), the pH and redox conditions, and the progressive release of major elements as well as the metals Cr and V. Modeling indicates that the dilution effect of the L/S ratio is often coupled to solubility-controlled processes, which are sensitive to both the pH and the redox potential. A sensitivity analysis of kinetic uncertainties on the modeling of element releases is performed.

References

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Citations

Aug 13, 2014·Journal of Hazardous Materials·D MombelliE Garcia-Diaz
Oct 23, 2015·Journal of Hazardous Materials·G CostaA Stramazzo
Mar 13, 2016·Journal of Environmental Sciences (China)·Tung-Hsin SuYu-Chen Lee
Mar 19, 2014·Waste Management·Peter Grathwohl
Jan 18, 2015·Journal of Hazardous Materials·R BaciocchiR Pomi
Aug 27, 2013·Chemosphere·K MaternT Mansfeldt
Dec 28, 2017·Environmental Science and Pollution Research International·Minyu ZuoWantana Klysubun
Jun 26, 2015·Environmental Monitoring and Assessment·Alex L Riley, William M Mayes
Dec 10, 2019·Environmental Science and Pollution Research International·Bao LiuQianqian Ren
Jun 30, 2011·Journal of Environmental Quality·Radmila MilačičJanez Šč Ančar
May 26, 2017·Environmental Science and Pollution Research International·Shashikant Yadav, Anurag Mehra
Mar 25, 2020·Environmental Science and Pollution Research International·Bo ChenYongju Choi
Jan 7, 2021·Environmental Science and Pollution Research International·Shashikant Yadav, Anurag Mehra
Apr 5, 2017·Journal of Environmental Sciences (China)·Yu-Hui XuHelmut Brandl
Oct 17, 2016·The Science of the Total Environment·Nadeesha H KoralegedaraDionysios D Dionysiou
Apr 4, 2017·Waste Management·Shashikant Yadav, Anurag Mehra
Jul 30, 2021·Journal of Hazardous Materials·James O'ConnorNanthi Bolan

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