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The preparation of cementing admixture from tailings and co-solidification of Pb2+ with cement is a green way to realize the resource utilization of tailings and treatment of the lead-containing wastewater. In this paper, the tungsten tailings were activated in different ways, and the mechanical properties of the tungsten tailings-cement solidified body with different activation systems and the solidification behavior of Pb2+ were studied. The phase and microstructure of the hydrated product were characterized by XRD, FT-IR, SEM and EDS. The results showed that the curing effect of Pb2+ was obviously different of different activation systems, and the curing effect of the solidified body of the ternary composite activation system (TCAS) was the best, second only to the pure cement system (PCS). Different activation methods have a significant impact on the mechanical properties of the solidified body. With the increase of the Pb2+ content, the compressive strength of the solidified body gradually decreased, the Pb2+ leaching concentration gradually increased; with the extension of the curing age, the compressive strength gradually increased, and the Pb2+ leaching concentration gradually decreased. In particular, the compressive strength of the 28d solidified body was 31.43 MPa and the leaching concentration of Pb2+ was only 0.38 mg/L when the Pb2+ content was 5%. The phase, microstructure and EDS results of the hydration products showed that Pb2+ was mainly solidified in the C-S-H gel.
Słowa kluczowe
Rocznik
Tom
Strony
art. no. 162618
Opis fizyczny
Bibliogr. 42 poz., rys., tab., wykr.
Twórcy
autor
- School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China
autor
- School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China
- Jiangxi Key Laboratory of Mining Engineering, Ganzhou, 341000, China
autor
- School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China
autor
- School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China
autor
- School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China
autor
- School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China
Bibliografia
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Uwagi
Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-91ee9e56-f027-4c88-afba-6cc398494a71