Regional-scale investigation of salt ions distribution characteristics in bauxite residue: A case study in a disposal area

Xue, Shengguo; Wang, Qiong-Li; Tian, Tao; Ye, Yuzhen; Zhang, Yifan; Zhu, Feng

doi:10.1007/s11771-019-4014-x

Cited by 10 publications

(2 citation statements)

References 27 publications

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“…Therefore, this study shows that K + and Ca 2+ are the main components in the composition of soil cations. From the perspective of soil salinity, the soil in the reclamation area of Hengsha Island belongs to chloride-type saline alkali land (Xue et al,2019).…”

Section: Discussionmentioning

confidence: 99%

Effect of reclamation projects on the salt ion migration process in the saline-alkali soil of tidal flats

Zhu,

Zhou,

Zhang

et al. 2024

Preprint

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The estuarine and tidal flat silt-promoting project and enclosure project have increased the land supply, but the soil salinization is serious, and the research on the driving mechanism of soil salinity and nutrients in reclamation projects is relatively few. To understand the migration law and major factors influencing saline-alkali ions in soil after reclamation projects, six reclamation areas on Hengsha Island from 2003 to 2018 were used as research locations, and 55 investigation sites were set up to monitor and analyze the saline-alkali ions and physical and chemical indexes in soil and water. The results showed that the reclamation areas in the Yangtze River estuary were all chloride-type saline alkali areas. Among them, the saline-alkali ions in the soil in the reclamation area were significantly higher than those in the old reclamation area within five years. Na+, K+ and Cl- were higher in areas with low moisture content, while Ca2+, SO42- and HCO3- were higher in soil with vegetation. The soil salt ions and physical and chemical indexes in the reclamation area appeared stratified. Correlation analysis showed that organic matter, moisture content and phosphorus were the major factors affecting soil salt ions and pH in the reclamation area.

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Section: Discussionmentioning

confidence: 99%

Effect of reclamation projects on the salt ion migration process in the saline-alkali soil of tidal flats

Zhu,

Zhou,

Zhang

et al. 2024

Preprint

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“…The improved aggregate structure is critical to soil formation process in bauxite residue. Ca 2+ and Na + were the major salt cations in bauxite residue (Xue, Wang, et al, 2019), while the difference of their contents directly affected the formation of stable aggregates (Bronick & Lal, 2005). Variations on MWD values indicated that Ca 2+ addition enhanced aggregate stability of bauxite residue.…”

Section: Discussionmentioning

confidence: 99%

Evaluating aggregate stability, surface properties and disintegration behaviour of bauxite residue induced by Ca/Na

Xue

Zhu

et al. 2020

Land Degrad Dev

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Bauxite residue, a typical industrial solid waste which contains a large amount of Na+, is usually physically degraded. Understandings of aggregate formation, which is a critical process in soil development, are essential to facilitate ecological rehabilitation on the disposal areas. However, few studies have investigated the aggregation behaviour and mechanisms of key salt ions (Ca2+ and Na+) in residue aggregates. Therefore, an integrated method of Le Bissonnais' method, the combined determination method and laser diffraction measurements was applied to evaluate aggregate stability, surface properties and disintegration behaviour of bauxite residue following Ca/Na additions. With increasing Ca2+ addition, mean weight diameter increased, indicating improved resistance to dispersion. Ca2+ had a positive effect on flocculation of silt‐size microaggregates, while disintegration was induced following Na+ addition. Repeated laser diffraction analysis of residue samples circulating in 50 mmol L−1 electrolyte solution (Ca2+/Na+) provided a detailed view of the changes in particle size distribution as aggregates fragmented. The visualized three‐dimensional surface map revealed that Na+ promoted the disintegration of >250 μm aggregates into finer dispersed particles, while Ca2+ protected the microaggregates from fragmenting into smaller particles. Variation in electrochemical properties of aggregate surfaces affected the micro‐morphology significantly. The findings provide a new approach to specify pedogenic aggregate behavior of bauxite residue, while revealing the effects of Ca2+/Na+ on aggregate stability, surface electrochemical properties and its micromorphology. The results will provide a detailed understanding of aggregate behavior during soil formation process in bauxite residue.

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Novel Plant Growth-Promoting Bacteria Isolated from Bauxite Residue: The Application for Revegetation

Chen

Cheng

Zhang

et al. 2022

Bull Environ Contam Toxicol

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Regional-scale investigation of salt ions distribution characteristics in bauxite residue: A case study in a disposal area

Cited by 10 publications

References 27 publications

Effect of reclamation projects on the salt ion migration process in the saline-alkali soil of tidal flats

Effect of reclamation projects on the salt ion migration process in the saline-alkali soil of tidal flats

Evaluating aggregate stability, surface properties and disintegration behaviour of bauxite residue induced by Ca/Na

Novel Plant Growth-Promoting Bacteria Isolated from Bauxite Residue: The Application for Revegetation

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