Complexing Properties of Scandium(III) in Alkaline Medium

Pasechnik, L.А.; Shirokova, A. G.; Koryakova, O. V.; Sabirzyanov, N. A.; Yatsenko, S. P.

doi:10.1023/b:rjac.0000044150.12253.3d

Cited by 9 publications

(6 citation statements)

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“…[46]. It can also be seen in Figure 4 that REE (Sc, Y, La, Ce, Nd) are slightly extracted during water leaching, because of their interaction with alkali and soda [47]. As shown in some studies [39,40], the degree of scandium recovery from red mud to soda liquor usually does not exceed 20%.…”

Section: Water Leaching Of Esp Dustmentioning

confidence: 79%

“…Aluminum was chosen as an indicator of leaching efficiency as it was the only element extracted from the liquor during alkali leaching of ESPDW. The temperature range was selected, taking into account that, after the extraction of readily soluble sodium salts, the alumina in the material is mainly represented by boehmite, the leaching of which requires a temperature of more than 160 °C [49] It can also be seen in Figure 4 that REE (Sc, Y, La, Ce, Nd) are slightly extracted during water leaching, because of their interaction with alkali and soda [47]. As shown in some studies [39,40], the degree of scandium recovery from red mud to soda liquor usually does not exceed 20%.…”

Section: Kinetics Of Esp Dust Leaching By Alkaline Aluminate Liquormentioning

confidence: 99%

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Concentration of Rare Earth Elements (Sc, Y, La, Ce, Nd, Sm) in Bauxite Residue (Red Mud) Obtained by Water and Alkali Leaching of Bauxite Sintering Dust

et al. 2020

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One of the potential sources of rare-earth elements (REE) is the industrial waste known as red mud (bauxite residue), in which the majority of REE from the initial bauxite are concentrated via the Bayer process. Therefore, the studies of the subject, both in Russia and outside, focus almost exclusively on red mud processing. This article looks into the possibility of REE concentration into red mud by leaching an intermediate product of the bauxite sintering process at Russian alumina refineries, namely electrostatic precipitator (ESP) dust. The experimental works were performed by X-ray diffraction (XRD)and electron probe microanalysis (EPMA) of the sinter and sinter dust. The determination of major and rare-earth elements in the sinter from the rotary kilns and in the ESP dust before and after leaching was carried out by X-ray fluorescence (XRF) and plasma mass spectrometry (ICP-MS). The study showed that it is possible to obtain red mud that contains three times more REE than traditional waste red mud after two-stage leaching ESP dust in the water at 95 °C followed by leaching in an alkaline-aluminate liquor at 240 °C. The shrinking core model was used to study the kinetics of leaching of the original ESP dust and water-treated dust in alkaline-aluminate liquor. The study showed the change in the limiting stage of the alkaline leaching process after water treatment, with the activation energy growing from 24.98 to 33.19 kJ/mol.

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Section: Water Leaching Of Esp Dustmentioning

confidence: 79%

Section: Kinetics Of Esp Dust Leaching By Alkaline Aluminate Liquormentioning

confidence: 99%

Concentration of Rare Earth Elements (Sc, Y, La, Ce, Nd, Sm) in Bauxite Residue (Red Mud) Obtained by Water and Alkali Leaching of Bauxite Sintering Dust

et al. 2020

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“…Meanwhile, Russian researchers have reported that it is possible to efficiently leach scandium from bauxite residue in alkaline conditions (Yatsenko and Pyagai, 2010;Fomin et al, 2004). The development of the process was based on the observation that scandium forms a soluble anionic complex compound with carbonate ions (Pasechnik et al, 2004). Whereas only 0.43 g L -1 Sc 2 O 3 can be dissolved at 25 °C in a solution containing 100 g L -1 Na 2 CO 3 , scandium is much better soluble in a NaHCO 3 solution: 16.7 g L -1 Sc 2 O 3 can be dissolved in a solution containing 100 g L -1 NaHCO 3 (Fomin et al, 2004).…”

Section: Recovery Of Rare Earths From Red Mudmentioning

confidence: 99%

Towards zero-waste valorisation of rare-earth-containing industrial process residues: a critical review

Binnemans

Jones

Blanpain

et al. 2015

Journal of Cleaner Production

516

282

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The supply risk for some critical rare-earth elements (REEs), which are instrumental in many cleantech applications, has sparked the development of innovative recycling schemes for Endof-Life fluorescent lamps, permanent magnets and nickel metal hydride batteries. These waste fractions represent relatively small volumes, albeit with relatively high rare-earth contents.Nevertheless, rare earths are also present in lower concentrations in a multitude of industrial process residues, such as phosphogypsum, bauxite residue (red mud), mine tailings, metallurgical slags, coal ash, incinerator ash and waste water streams. This review discusses the possibilities to recover rare earths from these "secondary resources", which have in common that they contain only low concentrations of rare-earth elements, but are available in very large volumes and could provide significant amounts of rare earths. The success rate is set to increase if the rare-earth recovery from these industrial waste streams is part of a comprehensive, zero-waste, "product-centric" valorisation scheme, in which applications are found for the residual fractions that are obtained after removal of not only the rare earths but also other valuable (base) metals.

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“…In the area of high pH values, the OH – ions completely replace the CO 3 2– ions in the carbonate complexes of Sc, as a result of which secondary precipitates are formed, including Sc(OH) 3 or ScO(OH). 28 , 77 , 78 …”

Section: Resultsmentioning

confidence: 99%

“…This is why in the absence of CO 2 (g) during carbonate leaching of RM a spontaneous pH increase of the aqueous phase usually occurs, which leads to a decrease of Sc extraction because its solubility in alkaline solutions is essentially lower as compared with carbonate–bicarbonate ones. In the area of high pH values, the OH – ions completely replace the CO 3 2– ions in the carbonate complexes of Sc, as a result of which secondary precipitates are formed, including Sc(OH) 3 or ScO(OH). ,, …”

Section: Resultsmentioning

confidence: 99%

Evaluation of Main Factors for Improvement of the Scandium Leaching Process from Russian Bauxite Residue (Red Mud) in Carbonate Media

et al. 2021

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The carbonate leaching of scandium from the landfilled bauxite residue (red mud) of the Bogoslovsky Aluminum Plant (Russia) and samples of red mud (RM) after alkaline pretreatment has been investigated. The results of kinetic studies allowing to compare and evaluate the effectiveness of different conditions and intensification factors in the process of scandium leaching from RM in carbonate/bicarbonate media are presented. It was determined that for 2.0 mol L –1 Na 2 CO 3 leaching solution ultrasonic treatment under gas (CO 2 ) carbonation conditions in the pH range of 9.5–10.0 allows reducing the scandium leaching time by two times and reaching 40–45% scandium extraction. Leaching of RM in carbonate/bicarbonate media is accompanied by secondary processes (adsorption, hydrolysis, and coprecipitation) leading to a decrease in scandium extraction. The obtained results allow improving understanding of scandium chemical behavior in complex aqueous carbonate/bicarbonate systems and can be used for the optimization of the alternative carbonate process for scandium extraction from RM.

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Complexing Properties of Scandium(III) in Alkaline Medium

Cited by 9 publications

References 0 publications

Concentration of Rare Earth Elements (Sc, Y, La, Ce, Nd, Sm) in Bauxite Residue (Red Mud) Obtained by Water and Alkali Leaching of Bauxite Sintering Dust

Concentration of Rare Earth Elements (Sc, Y, La, Ce, Nd, Sm) in Bauxite Residue (Red Mud) Obtained by Water and Alkali Leaching of Bauxite Sintering Dust

Towards zero-waste valorisation of rare-earth-containing industrial process residues: a critical review

Evaluation of Main Factors for Improvement of the Scandium Leaching Process from Russian Bauxite Residue (Red Mud) in Carbonate Media

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