Phosphogypsum stabilization of bauxite residue: Conversion of its alkaline characteristics

Xue, Rui; Li, Meng; Jiang, Jun; Millar, Graeme J.; Li, Chuxuan; Kong, Xiangfeng

doi:10.1016/j.jes.2018.05.016

Cited by 126 publications

(34 citation statements)

References 56 publications

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“…This strategy includes the removing of soluble ion of sodium (Na + ) from the colloid's surface of clays in these sodic-saline soils via reclamation process (Shi et al 2019). Different soil amendments could be used in this reclamation process such as gypsum, phosphogypsum (Xue et al 2019), and using genetic plant tolerance to soil salinity and alkalinity (Huang 2018).…”

Section: Soil Alkalinity Stressmentioning

confidence: 99%

Stressful Environments and Sustainable Soil Management: A Case Study of Kafr El-Sheikh, Egypt

El-Ramady

Abowaly

Elbehiry

et al. 2019

EBSS

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S TRESSED environments have long been a question of great interest in a wide range of fields. So, many considerable literatures have grown up around this theme. In Egypt, there are several common problems related to the stressed environments. These stresses include decline of soil fertility, soil salinity and alkalinity, soil water logging, salt-affected soils, soil pollution, climate change, overpopulation growth, urban sprawl, land degradation, deterioration of natural resources, etc. More generally, national income will decline and will in turn result in the spread of social and political problems. Kafr El-Sheikh governorate can be considered one of the most important areas in Egypt, which calls "the governorate of the hope and the future" due to its location and wealths. Whereas, this governorate suffers from the most common stresses in Egypt including pollution, salinity, alkalinity and waterlogging. Great problems have been recorded in Kafr El-Sheikh related to stressed environments and suggested solutions also have been addressed. Therefore, a sustainable management should be adapted for overcoming these stressed environments in Kafr El-Sheikh.

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Section: Soil Alkalinity Stressmentioning

confidence: 99%

Stressful Environments and Sustainable Soil Management: A Case Study of Kafr El-Sheikh, Egypt

El-Ramady

Abowaly

Elbehiry

et al. 2019

EBSS

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“…Most of this byproduct (85%) is stored in large stockpiles without any treatment. About 15% of this waste is re-used in building materials, soil amendment for soil remediation, agricultural fertilizers and Portland cement manufacture (e.g., [3][4][5][6][7]).…”

Section: Introductionmentioning

confidence: 99%

Phosphogypsum waste as additives to lime stabilization of bentonite

Oumnih

Bekkouch

Gharibi

et al. 2019

Sustain Environ Res

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Waste recycling with increasing the lifecycle of resource is a novel approach for enhancing circular economy. Within this context, this study aims to give a second life cycle to phosphogypsum (PG) waste, which is a byproduct from phosphoric acid manufacture, as useful resources. This study evaluates the sustainability of this harmful waste, which is accumulated in large stockpiles and becomes hazardous during storage, and to stabilize bentonite-based concrete intended for road construction. The effect of raw bentonite (Ca-Na montmorillonite), PG, and lime on the properties of cementitious materials has been investigated through various tests. The properties examined include chemistry (X-ray Fluorescence Spectrometry), mineralogy (X-ray Powder Diffraction and Fourier-Transform Infrared Spectroscopy), calorimetry (Differential Thermal Analysis/Thermogravimetry) and microstructure (Scanning Electron Microscopy) of the mortar based on different mixtures of bentonite, PG and lime. The result show that lime and PG addition involves in the formation of new nanocrystalline phases and the disappearance of certain minerals as portlandite. Calcium silicate hydrate gel appeared in the mixture with 8% of lime, whereas strätlingite was neoformed in the mixture with 8% of lime and 8% of PG. These nanocrystalline phases are responsible for enhancing mechanical strength through the pozzoloanic reaction.

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“…it is however a long-term restorative process. Seawater treatment is similar to that of gypsum (Burke et al 2013;Xue et al 2019b;Babu and Reddy 2011;Renforth et al 2012). Ca 2+ and Mg 2+ in seawater are introduced into the bauxite residue to reduce pH, but the presence of Na + will destroy the physical and chemical structure of the bauxite residue.…”

Section: Introductionmentioning

confidence: 87%

“…Current research has largely focused on removal of its alkalinity, including gypsum transformation, seawater neutralization, carbon dioxide (CO2) sequestration and acid neutralization (Burke et al 2013;Courtney and Kirwan 2012;Barbhuiya et al 2011). Application of gypsum has been widely used for the restoration of bauxite residue disposal areas (Courtney and Timpson 2005;Xue et al 2019b). This process, relies on Ca 2+ from the gypsum to form carbonate precipitates with alkaline substances in the residue, thus inhibiting the dissolution of alkaline minerals thereby reducing pH;…”

Section: Introductionmentioning

confidence: 99%

Revealing the alkaline characteristic evolution of bauxite residue under biomass fermentation

Jiang

et al. 2019

J Soils Sediments

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Purpose: Biomass fermentation has been proposed as a simple and economical strategy to alleviate the high alkalinity of bauxite residue. This study investigates the neutralization of bauxite residue following the application of biomass as an alkali modifier by natural fermentation. Materials and methods: Fresh bauxite residue samples were collected from Pingguo refinery (Aluminum Corporation of China). Samples were treated with straw mulching (SC), straw mixing (SM), bagasse mulching (BC), and bagasse mixing (BM), respectively. Treatments were analyzed for pH, EC, metal cations and soluble alkali (OH-, Al(OH)4and CO3 2-). The mineral phase and Na speciation were analyzed by Xray diffraction (XRD) and near-edge X-ray absorption fine structure (Na-XANES). Results and discussion: Optimum application rate for either straw or bagasse was 20% (w/w), reducing leachate pH from 10.26 to 8.56. During biomass transformation, the alkaline mineral grossular was completely dissolved, whilst calcite and cancrinite were dissolved to a lesser degree. No treatment changed the spatial distribution of Na + , but the basic anions (OH-, CO3 2and Al(OH)4-) were significantly reduced. Conclusions: Following treatment application, soluble alkali in the residues was significantly reduced whilst the alkaline minerals were slightly dissolved. This was determined as the main cause for the decrease in residue pH.

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Phosphogypsum stabilization of bauxite residue: Conversion of its alkaline characteristics

Cited by 126 publications

References 56 publications

Stressful Environments and Sustainable Soil Management: A Case Study of Kafr El-Sheikh, Egypt

Stressful Environments and Sustainable Soil Management: A Case Study of Kafr El-Sheikh, Egypt

Phosphogypsum waste as additives to lime stabilization of bentonite

Revealing the alkaline characteristic evolution of bauxite residue under biomass fermentation

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