Treatment of Bayer-Process Red Mud through Microbially Induced Carbonate Precipitation

Liu, Peng; Shao, Guanghui; Huang, Rongpin

doi:10.1061/(asce)mt.1943-5533.0003691

Cited by 10 publications

(3 citation statements)

References 22 publications

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“…Over 90% of the world's alumina production is produced through the Bayer process, and consequently, the generated bauxite residue represents a significant portion of by-products from alumina extraction [6]. For every one ton of alumina, on average 1.5 tons of bauxite waste are generated, and its global production exceeds 4 billion tons to the present day [7,8]. Large amounts of bauxite waste produced in mining industries are not reused.…”

Section: Introductionmentioning

confidence: 99%

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Influence of free silica in the production of synthetic aggregates from bauxite residue

Vilhena,

Viegas,

Souza

et al. 2023

Cerâmica

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The residue from the Bayer process has physicochemical characteristics that allow its use in the production of synthetic aggregate, although some characteristics such as low plasticity and water absorption still need better control. In this work, the influence of clay and silica addition on the sintering of synthetic aggregate produced from bauxite residue was analyzed. Compositions containing bauxite residue-sand-clay were elaborated, whose processing occurred using extrusion and crushing, followed by sintering at 1200 °C for 3 h. The X-ray diffraction analyses indicated the presence of new phases such as nepheline, originating from sodalite, and mullite resulting from the decomposition of kaolinite. Increasing the amount of free silica in the mixture resulted in an aggregate with a higher bulk density and lower water absorption, indicating that the amount of this raw material influenced the aggregate properties.

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Section: Introductionmentioning

confidence: 99%

“…Large amounts of bauxite waste produced in mining industries are not reused. Instead, they are stored in dams built on the surface taking up space and construction and maintenance costs [8,9]. Research has been developed looking for a way to reduce the environmental impacts caused by bauxite waste [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Influence of free silica in the production of synthetic aggregates from bauxite residue

Vilhena,

Viegas,

Souza

et al. 2023

Cerâmica

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“…Expansive clays are extremely fragile in arid and semi-arid climates or long drying processes, leading to the evaporation loss of soil moisture and the decrease of soil plasticity [17]. The desiccation fissures would easily occur when the surface tensile stress reached the tensile strength of the soil or the volume shrinkage was restricted [1].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Initial Water Content and Density on the Swelling-Shrinkage and Cracking Characteristics of Compacted Clay

2022

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The swelling-shrinkage and cracking characteristics of compacted clay under the coupling effect of initial conditions are rarely studied. The dry-wet cycle test of compacted clay with varying initial water contents and densities was performed in this study; the size and cracking conditions were investigated. The results showed that when the initial moisture content was 21% and the dry density was 1.65 g/cm3, the longitudinal expansion amount of the compacted clay was relatively small. However, it was rather large when the initial water content was 17% and 19%. Under the same dry density, the final vertical shrinkage ratio of the sample with a water content of 21% was the smallest, while that of the samples with a water content of 23% and 25% was rather big. Under the same water content, the final vertical shrinkage ratio decreased with the increase in dry density. After three wetting-drying cycles, compacted clay with a dry density of 1.65 g/cm3 and an optimal initial water content of 21% produced the fewest cracks and had the lowest cracking factor (CF) (only 7.58%). The compacted clay specimens with the dry densities of 1.55 g/cm3 and 1.60 g/cm3 had rather significant cracking at the same initial moisture content of 21%. The mercury intrusion porosimetry (MIP) test demonstrated that in the first two dry and wet cycles, the distribution of large pores decreased and that of tiny pores increased. After the third cycle, the distribution of small and medium pores decreased slightly. The results of this study will provide theoretical guidance for selecting cover soils in landfills.

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Application of microbial mineralization in the treatment of sintering red mud

Liu,

Cheng,

Chen

et al. 2023

J. Cent. South Univ.

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Treatment of Bayer-Process Red Mud through Microbially Induced Carbonate Precipitation

Cited by 10 publications

References 22 publications

Influence of free silica in the production of synthetic aggregates from bauxite residue

Influence of free silica in the production of synthetic aggregates from bauxite residue

The Effect of Initial Water Content and Density on the Swelling-Shrinkage and Cracking Characteristics of Compacted Clay

Application of microbial mineralization in the treatment of sintering red mud

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