Innovative Technology for Alumina Production from Low-Grade Raw Materials

Senyuta, Alexander; Panov, А. V.; Suss, A. G.; Layner, Yuri

doi:10.1007/978-3-319-65136-1_36

Cited by 14 publications

(3 citation statements)

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“…Some companies have made significant advances in the development of alumina obtaining methods based on acidic process. Canadian company Orbite Aluminae Inc. presented technological methods of using HCl for the production of aluminium oxide and a number of by-products, such as silica, hematite and rare earth metals with HCl regeneration, thus increasing the profitability of alumina production [33].…”

Section: Acid Technologymentioning

confidence: 99%

Efficient Adsorbent-Desiccant Based on Aluminium Oxide

et al. 2021

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The review describes the main methods of obtaining hydroxides and aluminium oxides (AO) of various structures from gibbsite. The promising techniques of obtaining AO adsorbents are discussed, namely the technique of thermal activation in the mode of pneumatic transport with gibbsite by heated air (TCA Gb) and the technique of thermal activation of gibbsite in centrifugal flash reactors (CTA Gb). The main methods of improving the adsorbent properties of AO, such as the optimisation of texture characteristics and phase composition, as well as the influence of the modification of aluminium oxide adsorbents, obtained using CTA and TCA technologies with cations of alkaline metals, are considered. It is shown that the modification allows a controlled variation of the characteristics of donor and acceptor active sites on the surface of adsorbents and, thus, a substantial increase in their adsorption activity, in particular, with respect to water vapour.

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Section: Acid Technologymentioning

confidence: 99%

Efficient Adsorbent-Desiccant Based on Aluminium Oxide

et al. 2021

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“…During lateritic weathering of these clays, the adsorbed elements become concentrated with depth in the resulting bauxite deposits. 62,63 Bauxite resources are estimated to be 55 to 75 billion tonnes worldwide with the following distribution: 32% in Africa, 23% in Oceania, 21% in South America and the Caribbean, 18% in Asia and 6% elsewhere. 64,65 The 1970s saw a major expansion of the alumina industry in response to growth in primary Al demand, accompanied by a rapid production growth.…”

Section: Primary Mining Of Alumina and Residue Treatment Optionsmentioning

confidence: 99%

Re‐using bauxite residues: benefits beyond (critical raw) material recovery

Ujaczki

Feigl

Molnár

et al. 2018

J of Chemical Tech & Biotech

110

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Since the world economy has been confronted with an increasing risk of supply shortages of critical raw materials (CRMs), there has been a major interest in identifying alternative secondary sources of CRMs. Bauxite residues from alumina production are available at a multi‐million tonnes scale worldwide. So far, attempts have been made to find alternative re‐use applications for bauxite residues, for instance in cement / pig iron production. However, bauxite residues also constitute an untapped secondary source of CRMs. Depending on their geological origin and processing protocol, bauxite residues can contain considerable amounts of valuable elements. The obvious primary consideration for CRM recovery from such residues is the economic value of the materials contained. However, there are further benefits from re‐use of bauxite residues in general, and from CRM recovery in particular. These go beyond monetary values (e.g. reduced investment / operational costs resulting from savings in disposal). For instance, benefits for the environment and health can be achieved by abatement of tailing storage as well as by reduction of emissions from conventional primary mining. Whereas certain tools (e.g. life‐cycle analysis) can be used to quantify the latter, other benefits (in particular sustained social and technological development) are harder to quantify. This review evaluates strategies of bauxite residue re‐use / recycling and identifies associated benefits beyond elemental recovery. Furthermore, methodologies to translate risks and benefits into quantifiable data are discussed. Ultimately, such quantitative data are a prerequisite for facilitating decision‐making regarding bauxite residue re‐use / recycling and a stepping stone towards developing a zero‐waste alumina production process. © 2018 The Authors. Journal of Chemical Technology & Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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“…This process consists of hot alkaline leaching of the bauxite concentrates in order to selectively leach sodium aluminate. The world's largest aluminum producers of bauxite ore are China (51%), North America (13%), the Commonwealth of Independent States (9%) and the Middle East (Senyuta et al, 2016). The insoluble residues of the Bayer process are called red muds.…”

Section: Introductionmentioning

confidence: 99%

Production of electrolytic iron from red mud in alkaline media

Ahamed

Pons

Ricoux

et al. 2020

Journal of Environmental Management

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In this study, the feasibility of producing electrolytic iron from red muds in a strongly alkaline medium at 110 °C was studied. The red mud samples from a French industry were characterized by various techniques (ICP-AES, SEM, XRD) to determine their chemical and mineralogical compositions. The main phase in the red mud investigated was hematite (α-Fe2O3). Iron electrodeposition tests from red mud suspended in a 12.5 mol/L NaOH electrolyte were conducted at constant current in a stirred electrochemical cell. The solid:liquid ratio and amounts of impurities contained in red mud were varied to optimize the faradaic yield and the production rate of electrolytic iron. Whereas hematite can be reduced to iron with a current efficiency over 80% for a current density (cd) up to 1000 A/m 2 , the current efficiency with red muds was highest for a cd below 50 A/m 2 and then decreased regularly to 20% at 1000 A/m 2 . In all cases, the deposit produced contained more than 97% metal iron. The moderate performance of the process investigated with red mud was attributed to a troublesome adsorption of red mud particles on the cathode, making the reduction far less efficient than that with hematite.

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Innovative Technology for Alumina Production from Low-Grade Raw Materials

Cited by 14 publications

References 1 publication

Efficient Adsorbent-Desiccant Based on Aluminium Oxide

Efficient Adsorbent-Desiccant Based on Aluminium Oxide

Re‐using bauxite residues: benefits beyond (critical raw) material recovery

Production of electrolytic iron from red mud in alkaline media

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