首页|Analysis of dominant phases inhibiting dissociation of smelting slags and the alkali depolymerization mechanism

Analysis of dominant phases inhibiting dissociation of smelting slags and the alkali depolymerization mechanism

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This study analyzed the prevalent physico-chemical 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 depolymer-ization,unveiling the optimal conditions for such depoly-merization to be an alkali to olivine molar ratio of 1:5,a reaction temperature of 700 ℃,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 sil-icate 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 depoly-merization 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.

Smelting slagKey phase analysisSilicate phasesAlkali depolymerization mechanism

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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School of Environment and Energy,Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Resource Recycling,South China University of Technology,Guangzhou 510006,China

School of Advanced Manufacturing School of Ocean,Fuzhou University,Quanzhou 362251,China

School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,China

South China Institute of Environmental Science,Ministry of Ecology and Environment,Guangzhou 510535,China

College of Metallurgy and Environment,Central South University,Changsha 410083,China

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2024

10.1007/s12598-024-02853-z

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(11)