Technical scandium oxide obtaining from red mud of Urals Aluminium Smelter

Медведев, А. С.; Khayrullina, R. T.; Kirov, S. S.; Suss, A. G.

doi:10.17580/tsm.2015.12.08

Cited by 5 publications

(4 citation statements)

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“…Another approach to the separation of rare earth elements is based on the cascade of centrifugal extractors which is designed by LLC "LIT" of companies group "Skaygrad" (Moscow) [11]. Similar technologies of scandium extraction are developed also in National University of Science and Technology (MISIS) [12].…”

Section: Resultsmentioning

confidence: 99%

Electro-Membrane Technology for Extraction of Valuable Compounds and Rare Earth Elements from the Red Mud

Vartan¹

2018

AJAC

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The paper is devoted to the developed technology of treatment of red mud, a dangerous waste formed in the process of production of aluminum from bauxite ores by the Bayer process. The technology was examined on the samples of red mud from Russia and Iran aluminum plants. Detailed description of the process is presented. The chemical analysis data before and after the treatment are presented. It is shown that the new technology based on the use of electro-membrane apparatuses makes possible to neutralize the hazardous red mud with separate production of valuable compounds including rare earth metals. Several schemes of the process are presented.

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Section: Resultsmentioning

confidence: 99%

Electro-Membrane Technology for Extraction of Valuable Compounds and Rare Earth Elements from the Red Mud

Vartan¹

2018

AJAC

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“…One way of large-scale waste treatment is based on using carbonate media as directly alkali metals or ammonia carbonate solution [14,15] or as carbon dioxide in alkali media wastes [16,17]. In the case of red mud, carbon dioxide influence allows to recover scandium into an alkali carbonate solution in the form of carbonate complexes [18,19]. Yttrium and lanthanides form stable carbonate complexes of REE with the composition of LnCO + 3 , Ln(CO 3 ) − 2 , and LnHCO 2+ 3 [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Complex Formation of Rare-Earth Elements in Carbonate–Alkaline Media

2023

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Rare earth metals are critical components for many industries. The extraction of rare earth metals from mineral raw materials presents many problems, both of a technological and theoretical nature. The use of man-made sources imposes strict requirements on the process. Thermodynamic and kinetic data that could describe the most detailed technological water–salt leaching and precipitation systems are insufficient. The study addresses the problem of a small amount of data on the formation and equilibrium of carbonate–alkali systems of rare earth metals. Isotherms of solubility of sparingly soluble carbonates with the formation of carbonate complexes are presented to evaluate equilibrium constants logK at zero ionic strength for Nd −11.3, Sm −8.6, Gd −8.0, and Ho −7.3. To accurately predict the system under consideration, a mathematical model was developed, which allows to calculate the water–salt composition. The initial data for calculation are concentration constants of stability of lanthanide complexes. This work will contribute to deepening knowledge about rare earth elements extraction problems and will serve as a reference for studying the thermodynamics of water–salt systems.

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“…Nevertheless, both dominating countries, in terms of scandium production, encounter several limitations associated with the variable scandium content in deposits, complex extraction processes, production costs, and infrastructure challenges [12]. Many researchers have investigated the possibility of recovering secondarily Sc from the by-products and waste streams of the iron, uranium, titanium, and aluminum industries [8,[13][14][15][16][17][18][19] Bauxite residue, also known as red mud, which is the main by-product of the alumina-refining process, typically contains small amounts of scandium (up to 100 mg/kg), which is considered sufficient for scandium valorization [8,20].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Efficiency of Ion Exchange Resins for the Recovery of Scandium from Sulfuric Acid Leaching Solutions

et al. 2023

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Scandium, a valuable element with restricted production sources mainly situated in China and Russia, is typically obtained as a by-product during the production of various materials. As the demand for scandium grows in the expanding aluminum and fuel cell industries, and with significant investments in rare earth mining in the USA and Australia, there is a need to explore alternative recovery sources. This research investigates the recovery of scandium from an acid pregnant leaching solution using ion exchange resins. The pregnant leaching solution was obtained after the leaching of bauxite residue with sulfuric acid. Commercial resins with different functional groups were tested for their performance in scandium extraction. In addition, the co-adsorption of impurities, such as iron and titanium, was studied. The feed solution consisted of 12.7 mg/L Sc and main impurities of 272 mg/L Fe and 33.6 mg/L Ti and was pretreated before the ion exchange process by acidification with sulfuric acid and iron powder addition to suppress silica gel formation and minimize the Fe(III) content in the solution accordingly. Among the tested resins, a D2EHPA-impregnated resin had high selectivity for Sc towards Ti, while a monophosphonic resin was also a promising option since it had a higher capacity for Sc but co-extracted Ti. These findings offer promising opportunities for the recovery of scandium from acid leaching solutions and could contribute to addressing the growing demand for this valuable element.

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Technical scandium oxide obtaining from red mud of Urals Aluminium Smelter

Cited by 5 publications

References 0 publications

Electro-Membrane Technology for Extraction of Valuable Compounds and Rare Earth Elements from the Red Mud

Electro-Membrane Technology for Extraction of Valuable Compounds and Rare Earth Elements from the Red Mud

Complex Formation of Rare-Earth Elements in Carbonate–Alkaline Media

Assessing the Efficiency of Ion Exchange Resins for the Recovery of Scandium from Sulfuric Acid Leaching Solutions

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