Effect of chelating solubilization via different alkanolamines on the dissolution properties of steel slag. (10th September 2022)

• Record Type: Journal Article
• Authors: Wang, Jianfeng; Chang, Lei; Yue, Deyu; Zhou, Yongfang; Liu, Hui; Wang, Yali; Yang, Songge; Cui, Suping
• Is Part Of: Journal of cleaner production. Volume 365(2022)
• Publication Date: 2022-09-10
• Subjects: Steel slag -- Chelation effect -- Hydration -- Dissolution -- Elemental concentrations; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2022.132824
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: This work aims to investigate the solubilizing ability of alkanolamines on steel slag (SS) and the chelating ability of alkanolamines with metal ions. In this paper, the chelation effect of four alkanolamines, including triethanolamine (TEA), triisopropanolamine (TIPA), diethanol-isopropanolamine (DEIPA), and methyl diethanolamine (MDEA), and metal ions on the dissolution of SS was investigated. The conductivity meter, pH meter, X-ray powder diffraction (XRD), inductively coupled plasma atomic emission spectroscopy (ICP-AES), total organic carbon (TOC) and isothermal calorimetry were used to investigate the solubilizing ability of SS impacted by alkanolamines. Additionally, the conductivity meter and chemical precipitation method (CPM) were used to investigate and explore the chelating ability of alkanolamines interacting with the metal ions. Finally, the nuclear magnetic resonance hydrogen ( 1 HNMR) spectroscopy was adopted to investigate the chelating mechanism between alkanolamines and metal ions. The results showed that the alkanolamines increased the elemental concentrations of [Ca], [Al], [Fe] and [Si] in the liquid phase of SS through chelating and promoted the dissolution of the mineral phase of C3 S, C2 S and C4 AF in SS. Among the different alkanolamines, DEIPA was present in the liquid phase for the longest time and possessed a more sustained ability to chelating metal ions. The result also shows that alkanolamines can chelate the Ca 2+, Al 3+ and Fe 3+ in solution. The chelating ability of tertiary alkanolamines were stronger than the secondary alkanolamine. And the alkanolamine with asymmetric molecular structure have stronger chelating ability than those with symmetric molecular structure. Tertiary alkanolamines form ternary five-ring structure with metal ion through nitrogen and oxygen atoms. Highlights: Alkanolamines promoted the dissolution of the mineral phase in steel slag. DEIPA possessed a more sustained ability to chelating metal ions. Alkanolamine with asymmetric molecular structure have stronger chelating ability. Ternary five-ring structure formed between the ternary alkanolamine and metal ion.