Toward sustainable green alumina production: A critical review on process discharge reduction from gibbsitic bauxite and large-scale applications of red mud

Zhou, Guotao; Wang, Yilin; Qi, Tiangui; Zhou, Qiusheng; Liu, Guihua; Peng, Zhihong; Li, Xiaobin

doi:10.1016/j.jece.2023.109433

Cited by 35 publications

(3 citation statements)

References 158 publications

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“…It could be anticipated that the dissociation of Al in IREEs-LRR could be achieved by leveraging the difference in solubility between REEs, U(Th) and Al in alkaline solutions, because the Al(OH) 3 could react with concentrated NaOH to form soluble NaAl(OH) 4 . , As to U, U also could be dissociated via the highly soluble uranyl complexes. For instance, U could be dissolved into NaOH-Na 2 CO 3 and Na 2 CO 3 -NaHCO 3 media with the leaching yield above 90 wt % in the tailings (0.08 wt % U), coal(11.3 wt % U), and M(OH)x·nH 2 produced by mineral (0.67 wt % U), respectively.…”

Section: Introductionmentioning

confidence: 99%

Disposal Strategy of Ion-Adsorption Rare Earth Elements Low-Level Radioactive Residues: Reduction Emission and Recovery for Aluminum and Uranium by Alkaline and Alkalescent Media

Chang,

Li,

Han

et al. 2024

ACS Sustainable Resour. Manage.

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Hindered by the separation among radioactive elements, aluminum (Al), and rare earth elements (REEs), acid methods encounter persistent obstacles in reduction emission of ion-adsorption rare earth elements low-level radioactive residues (IREEs-LRR). This work reported a stepwise strategy for the reduction of emission and recovery of Al and uranium (U) from IREEs-LRR by alkaline and alkalescent media. As one of the main phases, Al(III)-containing compounds of IREEs-LRR were first converted into soluble NaAl(OH) 4 with NaOH solution at ordinary pressure. Na 2 U 2 O 7 and the adsorbed state U(VI), as detected by speciation, were then transformed into soluble uranyl carbonate in a Na 2 CO 3 -NaCit solution. The total removal yields of Al and U approached 97 and 94 wt %, respectively, engendering an 84 wt % loss weight of IREEs-LRR. Additionally, the REEs content in the residues increased from 0.88 to 3.6 wt %, while the specific activity of U decreased from 5.6 to 1.9 Bq/g. The mechanism was related to the NaOH-mediated dissociation of Al(III) polymeric complexes coupled with the enhanced dissolving capacity of uranium (U(VI)) complexes in alkalescent medium. This paper provides a novel strategy for reducing residual radioactivity, enriching REEs, and recovering valuable Al and U from IREEs-LRR.

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Section: Introductionmentioning

confidence: 99%

Disposal Strategy of Ion-Adsorption Rare Earth Elements Low-Level Radioactive Residues: Reduction Emission and Recovery for Aluminum and Uranium by Alkaline and Alkalescent Media

Chang,

Li,

Han

et al. 2024

ACS Sustainable Resour. Manage.

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“…Therefore, in today's increasingly scarce mineral resource environment, finding an efficient method for red mud large scale reduction utilization can not only solve the problem of red mud storage, improve the economic benefits of alumina plants, but also alleviate the problem of resource shortages and achieve the goal of resource recycling. [8][9][10][11] The issue of environmental pollution caused by industrial wastewater has become increasingly severe with the rapid advancement of industrial production. The types and quantities of wastewater are experiencing a rapid increase, leading to the escalating and pervasive contamination of soil and water bodies.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Aluminum and Preparation of Polymerized Aluminum Ferric Sulfate from Red Mud

MA,

HUANG,

PAN

et al. 2023

ChemistrySelect

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By employing an “alkali calcination‐water leaching” integrated extraction technique, the separation of aluminum and iron components in red mud is achieved through the extraction of aluminum oxide and the preparation of polymeric aluminum iron sulfate (PAFS) water treatment agent. Basic characteristics of raw material red mud were characterized. The process parameters of activation calcination, leaching, and preparation of water treatment agent were determined. The prepared PAFS was characterized in terms of its fundamental properties and waste water treatment capacity. Results showed that the content of Al2O3 and Fe2O3 in red mud was 12.98 % and 6.09 %, respectively, distributed in the amorphous phase, while SiO2 and CaO existed in form of feldspar, calcite, and calcium silicate. During calcination stage, use NaOH as the activation medium, over 43 % Al2O3 could be extracted under the optimal activation and leaching process parameters. After acid leaching of the water‐leached residue, PAFS water treatment agent was prepared by utilizing the resultant acid leaching solution with NaOH as PH regulator. By optimizing the process parameters for preparation, an impressive turbidity removal rate of 97.52 % was achieved for the resulting PAFS. This study presents a viable approach for achieving significant reduction and maximizing the value‐added utilization of red mud.

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“…Up to the present, the cumulative stock of global red mud is about 7 billion tons, but the comprehensive utilization rate is less than 5% [1], and a large quantity of red mud storage seriously pollutes the natural environment [2]. Tailings are solid waste generated after beneficiation, and the annual discharge of iron ore tailings is increasing, posing a great threat to the natural environment [3].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Fiber on the Mechanical Properties of Controllable Low-Strength Materials

Qian

Jiang

2023

Materials

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Numerous studies have been conducted on fiber-reinforced concrete; however, comparative investigations specifically focusing on the utilization of fibers in CLSM remain limited. In this study, we conducted a systematic investigation into the mechanical properties of controlled low-strength material (CLSM) by manipulating the length and doping amount of fibers as control variables. The 7-day compressive strength (7d-UCS), 28-day compressive strength (28d-UCS), and 28-day splitting strength of CLSM were employed as indicators to evaluate the material’s performance. Based on our comprehensive analysis, the following conclusions were drawn: (1) A positive correlation was observed between fiber length and material strength within the range of 0–6 mm, while conversely, a negative correlation was evident. Similarly, when the fiber doping was within the range of 0–0.3%, a positive correlation was identified between material strength and fiber doping. However, the strength of CLSM decreased when fiber doping exceeded 0.3%. (2) SEM and PCAS analyses provided further confirmation that the incorporation of fibers effectively reduced the porosity of the material by filling internal pores and interacting with hydration products, thereby forming a mesh structure. Overall, this study offers valuable insights into the manipulation of fiber length and doping amount to optimize the mechanical properties of CLSM. The findings have important implications for the practical application of CLSM, particularly in terms of enhancing its strength through fiber incorporation.

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Toward sustainable green alumina production: A critical review on process discharge reduction from gibbsitic bauxite and large-scale applications of red mud

Cited by 35 publications

References 158 publications

Disposal Strategy of Ion-Adsorption Rare Earth Elements Low-Level Radioactive Residues: Reduction Emission and Recovery for Aluminum and Uranium by Alkaline and Alkalescent Media

Disposal Strategy of Ion-Adsorption Rare Earth Elements Low-Level Radioactive Residues: Reduction Emission and Recovery for Aluminum and Uranium by Alkaline and Alkalescent Media

Extraction of Aluminum and Preparation of Polymerized Aluminum Ferric Sulfate from Red Mud

The Influence of Fiber on the Mechanical Properties of Controllable Low-Strength Materials

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