Microstructural Master Alloys Features of Aluminum–Erbium System

Savchenkov, S. А.; Kosov, Yaroslav Igorevich; Bazhin, V. Yu.; Krylov, K.R.; Kawalla, Rudolf

doi:10.3390/cryst11111353

Cited by 13 publications

(5 citation statements)

References 42 publications

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“…Despite the method of bauxite processing, RM contains a high number of valuable components, especially rare earth elements (REEs) that are widely used in high-tech materials production [12][13][14]. REEs do not dissolve during bauxite alkali leaching and concentrate in the solid residue with an enrichment factor of about two [15,16].…”

Section: Introductionmentioning

confidence: 99%

Selective Scandium (Sc) Extraction from Bauxite Residue (Red Mud) Obtained by Alkali Fusion-Leaching Method

et al. 2022

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Bauxite residue, known as “red mud,” is a potential raw material for extracting rare-earth elements (REEs). The main REEs (Sc, Y, La, Ce, Nd, Nb, and Sm) from the raw bauxite are concentrated in RM after the Bayer leaching process. The earlier worldwide studies were focused on the scandium (Sc) extraction from RM by concentrated acids to enhance the extraction degree. This leads to the dissolution of major oxides (Fe2O3 and Al2O3) from RM. This article studies the possibility of selective Sc extraction from alkali fusion red mud (RMF) by diluted nitric acid (HNO3) leaching at pH ≥ 2 to prevent co-dissolution of Fe2O3. RMF samples were analyzed by X-ray fluorescence spectrometry (XRF), X-ray diffraction (XRD), electron probe microanalysis (EPMA), and inductively coupled plasma mass spectrometry (ICP-MS). It was revealed that Sc concentration in RMF can reach up to 140–150 mg kg−1. Sc extraction was 71.2% at RMF leaching by HNO3 at pH 2 and 80 °C during 90 min. The leaching solution contained 8 mg L−1 Sc and a high amount of other REEs in the presence of relatively low concentrations of impurity elements such as Fe, Al, Ti, Ca, etc. The kinetic analysis of experimental data by the shrinking core model showed that Sc leaching process is limited by the interfacial diffusion and the diffusion through the product layer. The apparent activation energy (Ea) was 19.5 kJ/mol. The linear dependence of Sc extraction on magnesium (Mg) extraction was revealed. According to EPMA of RMF, Sc is associated with iron minerals rather than Mg. This allows us to conclude that Mg acts as a leaching agent for the extraction of Sc presented in the RMF in an ion-exchangeable phase.

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Section: Introductionmentioning

confidence: 99%

Selective Scandium (Sc) Extraction from Bauxite Residue (Red Mud) Obtained by Alkali Fusion-Leaching Method

et al. 2022

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“…The change in the symmetrical position of the three-dimensional surface shown in Figures 4-6 indicates a change in the dependence between asphaltene and n-paraffin content as well as the corresponding sedimentation. Thus, the asymmetry of the threedimensional diagrams is the incompatibility degree of residual marine fuels, showing the influence of the presented factors on precipitation [54][55][56][57][58][59].…”

Section: Discussionmentioning

confidence: 99%

Exploring of the Incompatibility of Marine Residual Fuel: A Case Study Using Machine Learning Methods

et al. 2021

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Providing quality fuel to ships with reduced SOx content is a priority task. Marine residual fuels are one of the main sources of atmospheric pollution during the operation of ships and sea tankers. Hence, the International Maritime Organization (IMO) has established strict regulations for the sulfur content of marine fuels. One of the possible technological solutions allowing for adherence to the sulfur content limits is use of mixed fuels. However, it carries with it risks of ingredient incompatibilities. This article explores a new approach to the study of active sedimentation of residual and mixed fuels. An assessment of the sedimentation process during mixing, storage, and transportation of marine fuels is made based on estimation three-dimensional diagrams developed by the authors. In an effort to find the optimal solution, studies have been carried out to determine the influence of marine residual fuel compositions on sediment formation via machine learning algorithms. Thus, a model which can be used to predict incompatibilities in fuel compositions as well as sedimentation processes is proposed. The model can be used to determine the sediment content of mixed marine residual fuels with the desired sulfur concentration.

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“…The need to increase the content of useful components in rougher flotation is determined by a relationship between the content of the recovered component in the feedstock, its extraction and quality of the concentrate. In practice, this is resolved by the structure of the separation cascade [11][12][13] which is commonly arranged in such a way [14][15][16], that the necessary pulp beneficiation is achieved by rerecycling the middlings. In the canonical circuit [17][18][19], tailings of primary cleaning and recleaner flotation concentrate [20][21][22] are recycled to rougher flotation, which leads to an increasing content of recoverable mineral [23,24] at the expense of its difficult-to-float (persistent) forms.…”

Section: Ui K T T Ui Kt Ktmentioning

confidence: 99%

Determination of rational steam consumption in steam-air mixture flotation of apatite-nepheline ores

Evdokimov

Gerasimenko

2022

PMI

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Relevance of the study is determined by the decisions taken to increase the production volume of certain commercial products from mineral raw materials. The scale, impact and consequences of the projects on developing the resource-saving technologies for beneficiation of mineral raw materials are socially significant, and the economic growth of mining production complies with the sustainable development goals. The aim of the study is to develop the flotation circuit and mode that improve the technological performance of beneficiation of apatite-nepheline ores of the Khibiny Massif in the Kola Peninsula. The scientific idea of the work is to develop the flotation circuit, the movement of beneficiation products in which ensures a major increase in the content of the recovered component in the rougher flotation procedure with a simultaneous increase in dressability of the material. The above condition is met when mixing the feedstock with rough concentrate. Recovery of the valuable component from the resulting mixture is accomplished in a mode differing from the known ones in that the heat of steam condensation is used to increase water temperature in the interphase film between the particle and the bubble. For pulp aeration during flotation, a mixture of air and hot steam is used as the gas phase. A high recovery of the valuable component in ore flotation according to the developed circuit and mode is facilitated by increasing water temperature in wetting films due to the steam condensation heat. A high selectivity of flotation with a steam-air mixture can be explained using the concepts of a phonon component of disjoining pressure, the value and sign of which are associated with a difference in the dynamic structure of liquid in the wetting film and bulk liquid.

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Microstructural Master Alloys Features of Aluminum–Erbium System

Cited by 13 publications

References 42 publications

Selective Scandium (Sc) Extraction from Bauxite Residue (Red Mud) Obtained by Alkali Fusion-Leaching Method

Selective Scandium (Sc) Extraction from Bauxite Residue (Red Mud) Obtained by Alkali Fusion-Leaching Method

Exploring of the Incompatibility of Marine Residual Fuel: A Case Study Using Machine Learning Methods

Determination of rational steam consumption in steam-air mixture flotation of apatite-nepheline ores

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