Preparation and optimization of low-cost red mud based zero-valent iron porous adsorbent by carbothermal reduction and Box-Behnken response method

Du, Yufeng; Yang, Zhigang; Xu, Linxu; Shen, Xue; Shao, Mingrui; Chen, Feiyong; Wang, Jin

doi:10.1016/j.eti.2023.103376

Cited by 3 publications

(1 citation statement)

References 49 publications

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“…It is noteworthy that natural and abundant iron oxide is obtained in the output process as an industrial byproduct of red mud. This provides a favorable possibility for the synthesis of the Fe x O y /C composite absorber . Consequently, the dual goals for the low-cost synthesis of absorbers and high-value resource utilization of bulk solid waste can be satisfied simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Xue,

Su,

Jia

et al. 2024

ACS Appl. Electron. Mater.

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To achieve the high-value utilization of solid waste red mud and the low-cost preparation of efficient microwave absorbers, we recycled red mud (RM) and coal (C) to economically synthesize Fe x O y /C-based microwave absorbers (named RMCs) via a one-pot method and carbothermal reduction technology. It was found that the magnetic species and carbon crystallinity are sensitive to the carbothermal temperature. Interestingly, the microwave absorption performances of RMC composites display strong inclusiveness to the variable magnetic components with temperature. Benefiting from the suitable magnetic species and graphitization degree of carbon, excellent microwave absorption properties are achieved in the RMC composites. For RMC-700 composites, all of the minimum reflection loss (RL min ) values are less than −30 dB when the coating thickness is above 1.5 mm, and its maximum efficient absorption bandwidth (EAB max ) covers five-sixths of the Ku band (5 GHz). For RMC-900 samples with a coating thickness of 1.5 mm, the RL min value could reach −25 dB with a corresponding EAB of 4.16 GHz. An RL min value of −34.6 dB and an EAB max of 4.08 GHz are also obtained in RMC-1000 composites. The above excellent properties are mainly benefited by the strong dielectric loss, which is derived from Fe and its oxide particles as well as graphitized carbon. Moreover, multiple interface polarization and dipole polarization loss provide a guarantee for the powerful attenuation capability of the RMC composite. Impedance matching is also effectively regulated by the changeable magnetic constituents. More importantly, this work provides a direction for the application of recycled red mud, further reducing the environmental pollution caused by its stacking, and is expected to make certain contributions toward protection against electromagnetic radiation.

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Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Xue,

Su,

Jia

et al. 2024

ACS Appl. Electron. Mater.

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Development of Fe0 biochar composites synergistically activated with MgFe2O4 and Fe2+ through one-step pyrolyzing Fe sludge and MgCl2 for enhanced aqueous Cr(VI) removal

Zhang,

Zhao,

Huang

et al. 2024

Environmental Technology & Innovation

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Integrated Recycling of Red Mud for Iron Ore Sinter Manufacturing: Interfacial Bonding Regulation of the Sintering Process

Yi,

Hao,

et al. 2024

ACS Sustainable Chem. Eng.

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Recycling of red mud (RM) has posed an enduring challenge for the alumina industry. This work offers a comprehensive investigation into the fundamental and applied research of RM blend into the iron ore sintering process. Microsintering test was employed to investigate the formation and properties of bonding phase affected by RM. It resulted in impairment of bonding phase infiltration onto the iron ore surface and a decrease in the interfacial bonding strength. The interfacial interaction mechanism showed that the excessive TiO 2 and Al 2 O 3 brought by RM leads to the transformation of calcium ferrite (the target bonding phase) into perovskite and spinel with high melting points, resulting in the evolution of bonding phase from original dense strip-crystallized structure to fine-grained porous. Incorporation of CaO in conjunction with RM facilitates the formation of calcium ferrite within the bonding phase and enhances its infiltration on the iron ore surface, thereby augmenting interfacial bonding strength. Pilot-scale sintering was successfully conducted with 6% RM and 1.5% quicklime. The sinter yield of 76.68% and a tumbling index of 64.98% can be obtained, which were comparable to those achieved without RM, offering a feasible approach for large-scale recycling of RM in the steel industry.

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Preparation and optimization of low-cost red mud based zero-valent iron porous adsorbent by carbothermal reduction and Box-Behnken response method

Cited by 3 publications

References 49 publications

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Development of Fe0 biochar composites synergistically activated with MgFe2O4 and Fe2+ through one-step pyrolyzing Fe sludge and MgCl2 for enhanced aqueous Cr(VI) removal

Integrated Recycling of Red Mud for Iron Ore Sinter Manufacturing: Interfacial Bonding Regulation of the Sintering Process

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Preparation and optimization of low-cost red mud based zero-valent iron porous adsorbent by carbothermal reduction and Box-Behnken response method

Cited by 3 publications

References 49 publications

Facile Synthesis of FexOy/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Facile Synthesis of FexOy/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Development of Fe0 biochar composites synergistically activated with MgFe2O4 and Fe2+ through one-step pyrolyzing Fe sludge and MgCl2 for enhanced aqueous Cr(VI) removal

Integrated Recycling of Red Mud for Iron Ore Sinter Manufacturing: Interfacial Bonding Regulation of the Sintering Process

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Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud