Alkalinity conversion of bauxite refinery residues by neutralization

Johnston, Max; Clark, Malcolm W.; McMahon, PF; Ward, Nicholas J.

doi:10.1016/j.jhazmat.2010.06.091

Cited by 97 publications

(82 citation statements)

References 15 publications

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“…With consumption of free hydroxides from the aluminate anion by CO 2 , this will lead to alumina precipitation (Eqs. (14) and (15)) (Johnston et al 2010). As a result, bicarbonate and carbonate should be the dominant products in this process.…”

Section: Acid Gas Sequestrationmentioning

confidence: 95%

“…The accumulative inventory of bauxite residue reached an estimated 0.6 billion tons with an annual growth of more than 70 million tons in China, and currently, almost all bauxite residue is stored on land (Xue et al 2016). Bauxites alkaline nature is detrimental to the environment, and the dust formed from the surface of disposal areas is harmful to the surrounding biology (Zhang et al 2008;Johnston et al 2010;Banning et al 2014;Lockwood et al 2015). Furthermore, due to breaching of the dams containing the residue, leaching of alkaline waste from the slurry is a potential problem (Zhou and Song 2004;Pulford et al 2012;Samal et al 2013;Zhu et al 2016a).…”

Section: Introductionmentioning

confidence: 99%

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Proposal for management and alkalinity transformation of bauxite residue in China

Xue

Kong

Zhu

et al. 2016

Environ Sci Pollut Res

132

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Bauxite residue is a hazardous solid waste produced during the production of alumina. Its high alkalinity is a potential threat to the environment which may disrupt the surrounding ecological balance of its disposal areas. China is one of the major global producers of alumina and bauxite residue, but differences in alkalinity and associated chemistry exist between residues from China and those from other countries. A detailed understanding of the chemistry of bauxite residue remains the key to improving its management, both in terms of minimizing environmental impacts and reducing its alkaline properties. The nature of bauxite residue and the chemistry required for its transformation are still poorly understood. This review focuses on various transformation processes generated from the Bayer process, sintering process, and combined Bayer-sintering process in China. Problems associated with transformation mechanisms, technical methods, and relative merits of these technologies are reviewed, while current knowledge gaps and research priorities are recommended. Future research should focus on transformation chemistry and its associated mechanisms and for the development of a clear and economic process to reduce alkalinity and soda in bauxite residue.

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Section: Acid Gas Sequestrationmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Proposal for management and alkalinity transformation of bauxite residue in China

Xue

Kong

Zhu

et al. 2016

Environ Sci Pollut Res

132

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“…A common practice is neutralization using Mg reach seawater. This treatment results in the forming of LDH hydrotalcite [45]. LDHs can be used for removing several species (both organic and inorganic) in the Bayer process and several methods have been patented.…”

Section: F)mentioning

confidence: 99%

Characteristics, Preparation Routes and Metallurgical Applications of LDHs: An Overview

Richetta¹

2017

J Material Sci Eng

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The peculiar properties of layered Double Hydroxides (LDH) have progressively drawn the attention of the scientific community. The main characteristic of LDH is the ability to capture anionic species (organic and inorganic) to build different composites. This is made possible by the sandwich structure of the LDH, similar to the brucite architecture, made up of positive charged lamellas interspersed by anions. Several distant fields, ranging from medicine to physics and engineering, exhibit interest in LDH applications. To satisfy all those requirements, energy was spent to sculpt LDHs physical and chemical properties and for designing layered double hydroxides "ad hoc" for different needs and employments. Notably, among the many applications, those related to metallurgical processes and products are of particular interest. This paper presents the characteristics, the main preparation routes and reviews the applications of LDH to metallurgy with some examples taken from the experimental research of the author.

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“…These precipitates are in hydrotalcite form [102]. Together with this "unintentional" LDH formation [103], they can also be produced intentionally in the refinement process. Several studies were developed toward this direction.…”

Section: Anti-corrosionmentioning

confidence: 99%

Layered Double Hydroxides: Tailoring Interlamellar Nanospace for a Vast Field of Applications

Richetta¹,

Medaglia²,

Mattoccia³

et al. 2017

J Material Sci Eng

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Fifty-eight years ago Fenman, during an American Physical Society meeting at the California Institute of Technology, anticipated the problem of modifying and governing the world of the infinitely small. what is possible in principle… We are not doing it simply because we haven't yet gotten around to it." Useless to say how profound his sensibility for science was. We've just begun to walk in this enormous field, toward the assembly of devices atom by atom. What we did till now is still rudimentary. Anyhow we believe that Layered Double Hydroxides could play a role in manufacturing these nanometric equipments.Layered Double Hydroxides (LDHs) are 2D ionic lamellar nano-materials belonging to the group of anionic clays. Their structure consists of positively charged brucite-like layers and intercalated anions. The layered structure, together with the flexibility to intercept different anionic species in variable compositions, both inorganic and organic, has attracted increasing interest. In order to meet specific requirements in very distant fields, considerable efforts were made to tailor the physical/chemical properties of LDHs and to design engineered LDH for several applications, ranging from anticorrosion coatings, flame-retardants, catalysis, to water treatment/purification, and biomedical applications. Furthermore they have been applied in energy harvesting and conversion, thanks to the possibility of substituting the composing metals with transition metals.Within the framework of this contribution, we first briefly review the development of synthesis processes ( §1). In Paragraph 2, examples of the LDHs applications are reported. We will than focus on our laboratory experimental activities, showing the growth of the structures either on printed circuit tracks for applications of LDHs as gas sensors and biosensors. One more application is in nanostructured-modified textiles.

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Alkalinity conversion of bauxite refinery residues by neutralization

Cited by 97 publications

References 15 publications

Proposal for management and alkalinity transformation of bauxite residue in China

Proposal for management and alkalinity transformation of bauxite residue in China

Characteristics, Preparation Routes and Metallurgical Applications of LDHs: An Overview

Layered Double Hydroxides: Tailoring Interlamellar Nanospace for a Vast Field of Applications

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