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Cu/Cr co-stabilization mechanisms in a simulated Al_(2)O_(3)-Fe_(2)O_(3)-Cr_(2)O_(3)-CuO waste system

Frontiers of Environmental Science & Engineering 2021年第6期15卷 259-270页

作者： Fanling Meng Yunxue Xia Jianshuai Zhang Dong Qiu yaozhu chu Yuanyuan Tang State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China

Chromium slag usually contains various heavy metals,making its safe treatment *** sintering has been applied to resolve this issue and emerged as an effective method for metal immobilization by incorporating heavy metals into stable crystal ***,there is limited knowledge about the reaction pathways adopted by multiple heavy metals and the co-stabilization functions of the crystal *** study the Cu/Cr co-stabilization mechanisms during thermal treatment,a simulated system was prepared using a mixture with a molar ratio of Al_(2)O_(3):Fe_(2)O_(3):Cr_(2)O_(3):CuO=1:1:1:*** samples were sintered at temperatures 600–1300℃ followed by intensive analysis of phase constitutions and microstructure development.A spinel phase(CuFe_(x)Al_(y)Cr_(2–x–y)O_(4))started to generate at 700℃ and the incorporation of Cu/Cr into the spinel largely complete at 900℃,although the spinel peak intensity continued increasing slightly at temperatures above 900℃.Fe_(2)O_(3)/Cr_(2)O_(3) was more easily incorporated into the spinel at lower temperatures,while more Al_(2)O_(3) was gradually incorporated into the spinel at higher ***,sintered sample microstructures became more condensed and smoother with increased sintering ***/Cr leachability substantially decreased after Cu/Cr incorporation into the spinel phase at elevated *** 600℃,the leached ratios for Cu and Cr were 6.28%and 0.65%,*** sintering temperature was increased to 1300℃,the leached ratios for all metal components in the system were below 0.2%.This study proposes a sustainable method for managing Cu/Cr co-exist slag at reasonable temperatures.

关键词： Spinel structure Copper Chromium Co-stabilization Thermal treatment

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