Selectively leaching the iron-removed bauxite residues with phosphoric acid for enrichment of rare earth elements

Deng, Bona; Li, Guanghui; Ye, Qing; Liu, Mingxia; Rao, Mingjun; Jiang, Tao; Bauman, Lukas; Zhao, Boxin

doi:10.1016/j.seppur.2019.115714

Cited by 32 publications

(20 citation statements)

References 40 publications

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“…REE extraction degrees have a peak with the values of more than 75% for 10% HCl at the temperatures above 150 °C. These results are also in accordance with [53], where a significant influence of the temperature on leaching of REEs from iron-removed red mud was noted. There are few differences of REE leaching using the diluted and concentrated acids.…”

Section: Hpal For the Wat Samplesupporting

confidence: 92%

“…Figure 3 shows the influence of leaching temperature on the extraction degree of minor elements. As can be seen, for both 10% and 20% HCl the dissolution degrees of La, Ce, Pr, Nd are very similar, but the dissolution behavior of Sc and Y is rather different that is in agreement with the results of other researchers [53]. The recovery degrees of all REEs were near 40% for both the acid concentrations at 50 °C; they increase significantly with temperature rising.…”

Section: Hpal For the Wat Samplesupporting

confidence: 89%

“…It is well-known that an increase of pH value of the solution led to a decrease of Sc extraction [45,46]. It is previously reported [53] that a significant part of Y and Sc can be associated with NaAlSiO4 in the tailings obtained after carbothermic roasting of red mud with the addition of sodium salts, but the present investigation has shown that there were no positive correlation between their dissolution. On the contrary, SEM-EDX analysis of the residue obtained by HPAL of the SSAT sample (Figure 11 and Table 4) indicates clearly that Sc along with Zr are predominantly associated with titanium.…”

Section: Hpal Conditionscontrasting

confidence: 71%

“…It was reported that Sc in the slag obtained after red mud reduction smelting is associated with CaTiO3 [29] and with Ti in the initial red mud [60]. It should be mentioned that Sc also can be partially associated with grossular [53].…”

Section: The Solid Residues Obtained From the Wat Samplementioning

confidence: 99%

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Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminium and Other Valuable Components from the Non-Magnetic Residues Obtained from Red Mud after Iron Removal

Zinoveev¹,

Grudinsky²,

Zhiltsova³

et al. 2021

Preprint

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Red mud is a hazardous waste of alumina industry that contains high amounts of iron, aluminum, titanium and REEs. One of the promising methods for the extraction of iron from red mud is car-bothermic reduction with the addition of sodium salts. This research focuses on the process of hy-drochloric high-pressure acid leaching using 10–20% HCl of two samples of non-magnetic tailings obtained by 60-minute carbothermic roasting of red mud at 1300 °C and the mixture of 84.6 wt. % of red mud and 15.4 wt. % Na2SO4 at 1150 °C, respectively, with subsequent magnetic separation of metallic iron. An influence of temperature, leaching duration, solid-to-liquid-ratio and acid con-centration on dissolution behavior of Al, Ti, Mg, Ca, Si, Fe, Na, La, Ce, Pr, Nd, Sc, Zr were studied. Based on the investigation of the obtained residues, mechanism of passing of valuable elements into the solution was proposed. It has shown that 90% Al, 91% Sc and above 80% of other REEs can be dissolved under optimal conditions; Ti can be extracted into the solution or the residue depending on the leaching temperature and acid concentration. Based on the research results, novel flowsheets for red mud treatment were developed.

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Section: Hpal For the Wat Samplesupporting

confidence: 92%

Section: Hpal For the Wat Samplesupporting

confidence: 89%

Section: Hpal Conditionscontrasting

confidence: 71%

Section: The Solid Residues Obtained From the Wat Samplementioning

confidence: 99%

See 2 more Smart Citations

Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminium and Other Valuable Components from the Non-Magnetic Residues Obtained from Red Mud after Iron Removal

Zinoveev¹,

Grudinsky²,

Zhiltsova³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…As can be seen, for both 10 and 20% HCl the dissolution degrees of La, Ce, Pr, Nd are very similar, but the dissolution behavior of Sc and Y is rather different; it is in agreement with the results of other researchers [58]. The recovery degrees of all REEs were near 40% for both the acid concentrations at 50 • C; they increase significantly with temperature rising.…”

Section: Hpal For the Wat Samplesupporting

confidence: 90%

Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal

Zinoveev

Grudinsky

Zhiltsova

et al. 2021

Metals

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Red mud is a hazardous waste of the alumina industry that contains high amounts of iron, aluminum, titanium and rare-earth elements (REEs). One of the promising methods for the extraction of iron from red mud is carbothermic reduction with the addition of sodium salts. This research focuses on the process of hydrochloric high-pressure acid leaching using 10 to 20% HCl of two samples of non-magnetic tailings obtained by 60 min carbothermic roasting of red mud at 1300 °C and the mixture of 84.6 wt.% of red mud and 15.4 wt.% Na2SO4 at 1150 °C, respectively, with subsequent magnetic separation of metallic iron. The influence of temperature, leaching duration, solid-to-liquid-ratio and acid concentration on the dissolution behavior of Al, Ti, Mg, Ca, Si, Fe, Na, La, Ce, Pr, Nd, Sc, Zr was studied. Based on the investigation of the obtained residues, a mechanism for passing valuable elements into the solution was proposed. It has shown that 90% Al, 91% Sc and above 80% of other REEs can be dissolved under optimal conditions; Ti can be extracted into the solution or the residue depending on the leaching temperature and acid concentration. Based on the research results, novel flowsheets for red mud treatment were developed.

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Leaching of Neodymium From Hard Disk Drive Magnet Waste Using Citric Acid‐ Design of Experiments and Optimization

Ranjan Ray,

Chandra Tripathy,

Mishra

2024

ChemistrySelect

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Neodymium magnet waste recycling and precious metal recovery have drawn a lot of researchers’ attention because of their vital role in contemporary technology. In this work, the potential of citric acid for the leaching of neodymium from hard disk drive waste magnets has been examined using statistical approaches like full factorial design(FFD) and central composite design (CCD).The variables have been screened and conditions are optimized to obtain higher leaching. The polynomial quadratic Model proves effective to predict optimized conditions for neodymium leaching. Leachant concentration and temperature were screened as the most effective factors. Optimization conditions for the leaching process were achieved through central composite design, revealing that 2 mol/L citric acid and a temperature of 333 K provide the ideal conditions for the complete dissolution of neodymium. This extensive study contributes to sustainable materials management and resource conservation by illuminating the effective recovery of important metals from neodymium magnets.

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Selectively leaching the iron-removed bauxite residues with phosphoric acid for enrichment of rare earth elements

Cited by 32 publications

References 40 publications

Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminium and Other Valuable Components from the Non-Magnetic Residues Obtained from Red Mud after Iron Removal

Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminium and Other Valuable Components from the Non-Magnetic Residues Obtained from Red Mud after Iron Removal

Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal

Leaching of Neodymium From Hard Disk Drive Magnet Waste Using Citric Acid‐ Design of Experiments and Optimization

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