NDLI: Effects of binding materials on microaggregate size distribution in bauxite residues

Content Provider	Springer Nature Link
Author	Zhu, Feng Huang, Nan Xue, Shengguo Hartley, William Li, Yiwei Zou, Qi
Copyright Year	2016
Abstract	It is recognized that for successful establishment of a vegetation cover on bauxite residue disposal areas, soil formation and a greater understanding of the processes of soil development are crucial. The stability of microaggregates is a very important physical property that prevents erosion in bauxite residues. Samples were collected from a disposal area in Central China to determine not only the mechanism of aggregation but also clay dispersion. Colloidal stability was assessed by determining organic matter, carbonate, electrolyte, clay mineral, and iron-aluminum oxide forms, as these would contribute to their stability. Organic matter improved microaggregate stability by combining with clay particles and polyvalent cations to form macroaggregates. Polyvalent cations such as calcium had a positive effect on particle flocculation, while organic molecules were more effective at stabilizing microaggregates. Removal of salinity dispersed silt-size aggregates into clay-size aggregates and reduced microaggregate stability. Calcium improved particle aggregation, while sodium had the reverse effect. Quartz powder was added to the residues but did not show any cementing effect, while free and amorphous iron-aluminum oxides were effective binding agents for microaggregate formation. We propose that the presence of organic matter and polyvalent cations, together with incorporation of organic carbon and calcium minerals, may enhance the stability of this material and prove beneficial toward improving its physical condition.
Starting Page	23867
Ending Page	23875
Page Count	9
File Format	PDF
ISSN	09441344
Journal	Environmental Science and Pollution Research
Volume Number	23
Issue Number	23
e-ISSN	16147499
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-09-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bauxite residue Binding material Microaggregate size distribution Microaggregate stability Clay dispersion ratio Sodic properties Environment Environmental Chemistry Ecotoxicology Environmental Health Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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