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Leaching kinetics and reactivity evaluation of ferronickel slag in alkaline conditions
Abstract This paper evaluates the reactivity of individual mineral phases of ferronickel slag (FNS) based on the backscattered electron images analysis (BSE-IA) and presents the leaching kinetics of FNS in NaOH solutions, aiming to reveal the interrelationships among physicochemical properties, leaching behavior and reactivity of FNS. There are three typical phases identified in water-quenched FNS, namely FNS I, II and III phase. The FNS I phase is more prone to dissolve and preferentially participate in the reaction process than the other two phases. The dissolved Mg from FNS is mainly involved in the formation of hydrotalcite and N-M-S-H gels. Cr could not be detected during the leaching process. The activation energy for the leaching of Si and Al is 80.47 and 49.45 kJ/mol, respectively. A method for rapid evaluation of the reaction activity of FNS given the evaluation index of the individual leaching ratio of Si and Al is proposed.
Highlights Three typical individual mineral phases are identified in water-quenched FNS. Leaching process of FNS is controlled by diffusion through the surface product layer. The dissolution characteristics of Cr and Mg from FNS are figured out. A method for rapid evaluation of the reaction activity of FNS is proposed.
Leaching kinetics and reactivity evaluation of ferronickel slag in alkaline conditions
Abstract This paper evaluates the reactivity of individual mineral phases of ferronickel slag (FNS) based on the backscattered electron images analysis (BSE-IA) and presents the leaching kinetics of FNS in NaOH solutions, aiming to reveal the interrelationships among physicochemical properties, leaching behavior and reactivity of FNS. There are three typical phases identified in water-quenched FNS, namely FNS I, II and III phase. The FNS I phase is more prone to dissolve and preferentially participate in the reaction process than the other two phases. The dissolved Mg from FNS is mainly involved in the formation of hydrotalcite and N-M-S-H gels. Cr could not be detected during the leaching process. The activation energy for the leaching of Si and Al is 80.47 and 49.45 kJ/mol, respectively. A method for rapid evaluation of the reaction activity of FNS given the evaluation index of the individual leaching ratio of Si and Al is proposed.
Highlights Three typical individual mineral phases are identified in water-quenched FNS. Leaching process of FNS is controlled by diffusion through the surface product layer. The dissolution characteristics of Cr and Mg from FNS are figured out. A method for rapid evaluation of the reaction activity of FNS is proposed.
Leaching kinetics and reactivity evaluation of ferronickel slag in alkaline conditions
Cao, Ruilin (author) / Jia, Zijian (author) / Zhang, Zuhua (author) / Zhang, Yamei (author) / Banthia, Nemkumar (author)
2020-08-19
Article (Journal)
Electronic Resource
English
Characteristics and reactivity of ferronickel slag powder
| Online Contents | 2017
Characteristics and reactivity of ferronickel slag powder
| Elsevier | 2017
Alkali-Aggregate Reactivity of Ferronickel-Slag Aggregate Concrete
| British Library Conference Proceedings | 1997