Juan-Li Yuan, Jing-Biao Liu, Zhen Wu, Xiang-Ying Lv, Jian-Wei Du, Xue-Ming Liu, Hong Deng, Zhang Lin
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引用次数: 0
Abstract
This study analyzed the prevalent physicochemical phases of smelting slag from the perspective of data science and chemistry. Findings delineated the silicate phase as the pivotal and predominant constraining phase for the resource utilization of smelting slag. An intricate correlation between metallic elements and dominant phases was constructed. Typical silicate phase olivine (OL) was synthesized as a paradigm to examine alkali depolymerization, unveiling the optimal conditions for such depolymerization to be an alkali to olivine molar ratio of 1:5, a reaction temperature of 700 °C, and a duration of 3 h. The underlying mechanism of alkali depolymerization within silicate phases was elucidated under these parameters. The reaction mechanism of alkali depolymerization within silicate phases can be encapsulated in three sequential steps: (1) NaOH dissociation and subsequent adsorption of OH− to cationic (Mg or Fe) sites; (2) disruption of cation-oxygen bonds, leading to the formation of hydroxide compounds, which then underwent oxidation; (3) Na+ occupied the resultant cation vacancy sites, instigating further depolymerization of the intermediate Na2(Mg,Fe)SiO4. The articulated mechanism is anticipated to furnish theoretical underpinnings for the efficacious recuperation of metals from smelting slags.
期刊介绍:
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.