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Updated: Sep 18, 2025

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
Designing super-compatibility all-solid-waste binders for stabilization/solidification of Cr-contaminated soil
Ruolin Zhao1, Yan Xia1, Lei Ren1
1State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China; Qingshanhu Energy Research Center, Zhejiang University, Hangzhou 311300, China.
Abstract:
Chromium (Cr) contamination in soils represents a critical environmental and public health challenge globally, necessitating efficient and sustainable remediation strategies. This study proposes a "waste control by waste" concept by developing municipal solid waste incineration fly ash (MSWIFA)-activated all-solid-waste binders for the stabilization/solidification (S/S) of Cr-contaminated soil. Experimental results revealed that a binder system composed of MSWIFA and ground granulated blast-furnace slag exhibited superior performance due to the formation of calcium silicate hydrate (C-S-H), ettringite, and Friedel's salt. While the binder system composed of MSWIFA and incineration sewage sludge ash (ISSA) initially demonstrated limited reactivity owing to their low amorphous aluminosilicate content, however, the MSWIFA-ISSA system was unexpectedly activated by Cr-contaminated soil. CrO₄²- ions triggered a dissolution-reaction cascade, driving the formation of abundant hydration products stable monochromate (3CaO·Al2O3·CaCrO4·nH2O) phases. Notably, MSWIFA-ISSA systems with 50 % soil dosage obtained a 28-day compressive strength of 42.6 MPa and Cr immobilization efficiency of 96.9 %. Overall, this study provides valuable insights into the development of sustainable all-solid-waste binders for waste utilization and hazardous waste treatment.
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