The extraction of Ta, Nb and rare earths from fergusonite by using KOH sub-molten salt leaching

Li, Sun-Chol; Kang, Chung-Su; Kim, Sok-Chol; Kim, Chol-Ju; Kang, Chol-Jin

doi:10.1016/j.hydromet.2020.105358

Cited by 11 publications

(3 citation statements)

References 14 publications

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“…The leaching system is a kind of solid−liquid heterogeneous system, where agitation will suspend solid particles and allow efficient mixing in the solution. 26 As shown in Figure 5(a), after leaching in a KOH solution, part of Li from α-spodumene was dissolved into the alkaline leachate, and the other part was converted into an acid-soluble solid phase present in the alkaline residues, while the extraction efficiency of Li was represented by the blue and gray columns, respectively. According to Figure 7, the new acid-soluble lithium-containing phase was lithium silicate (Li 2 SiO 3 , PDF#29-0828), appearing in the residues under any experimental conditions.…”

Section: Leaching Process Of Spodumene Concentrate In Koh Solution 32...mentioning

confidence: 99%

“…Yu et al 25 recovered rare earths and Al from waste blue and green phosphors using a NaOH system, where Al could be extracted into the solution, while the rare earth elements present in the residues could be extracted by subsequent HCl leaching. Li et al 26 combined KOH leaching and acid leaching to extract Ta, Nb, and rare earths from fergusonite concentrate and recycled KOH efficiently. However, the researches of lithium extraction from αspodumene in a KOH solution is limited, and its kinetics are also absent.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics and Mechanism of Lithium Extraction from α-Spodumene in Potassium Hydroxide Solution

Qiu

Zhu

Jiang

et al. 2022

Ind. Eng. Chem. Res.

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Lithium extraction from α-spodumene in a potassium hydroxide solution was proposed to provide a new green metallurgical process for spodumene concentrate. The structure of α-spodumene could be destroyed directly by a KOH solution, and new solid-phase products of Li2SiO3 and KAlSiO4 were generated simultaneously. The total lithium extraction efficiency could reach 89.9%, of which 84.1% was converted into Li2SiO3 and 5.8% converted into the liquid phase under optimal conditions: initial KOH concentration of 50 wt %, stirring speed of 500 rpm, mass ratio of KOH/ore of 2:1, leaching temperature of 523.15 K, and leaching time of 16 h. The experimental data fitted well with the Avrami–Erofeev equation model, –ln(1 – X) = (Kt) n . The apparent activation energy and Avrami index were calculated as 106.37 kJ·mol–1 and 0.80, respectively.

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Section: Leaching Process Of Spodumene Concentrate In Koh Solution 32...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetics and Mechanism of Lithium Extraction from α-Spodumene in Potassium Hydroxide Solution

Qiu

Zhu

Jiang

et al. 2022

Ind. Eng. Chem. Res.

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“…It is a medium between molten salt and ordinary electrolytes. It has the advantages of high chemical activity, a high boiling point, excellent fluidity and high activity of oxygen anion [15][16][17][18]. In our previous study, to reduce reaction temperature and pollution, we applied sub-molten salt to decompose ZrSiO 4 .…”

Section: Introductionmentioning

confidence: 99%

Separation of Zr and Si in Zirconium Silicate by Sodium Hydroxide Sub-Molten Salt

Sun,

Song,

2024

Metals

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In order to cleanly and efficiently extract zirconium from zircon sand (the main component is ZrSiO4), sodium hydroxide sub-molten salt was used to decompose ZrSiO4 in this study. When ZrSiO4 reacts with sodium hydroxide sub-molten salt, the formation of Na2ZrSiO5 (a water-insoluble product) considerably affects the separation efficiency of Zr and Si and increases production cost. Thus, it is necessary to control the formation of Na2ZrSiO5. The influence of NaOH content, reaction temperature, reaction time, and NaOH/ore mass ratio on the formation of Na2ZrSiO5 were systematically investigated. The optimum reaction parameters for the inhibition of Na2ZrSiO5 formation were as follows: 80% NaOH content, 245 °C reaction temperature, 4:1 NaOH/ore mass ratio, 10 h reaction time, and 400 r/min agitation speed. These results indicate that ZrSiO4 is decomposed to Na2ZrO3 and Na2SiO3 by reacting with NaOH, realizing the separation of Zr and Si, and then the reactions between Na2ZrO3 and Na2SiO3 result in the formation of Na2ZrSiO5, during the decomposition of ZrSiO4 using NaOH sub-molten salt. The sub-molten salt decomposition process can realize the clean extraction of zirconium, which is conducive to the sustainable development of zirconium resources.

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Niobium and tantalum recovery from the primary source and from tin slag, an industrial challenge: A review

et al. 2022

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The extraction of Ta, Nb and rare earths from fergusonite by using KOH sub-molten salt leaching

Cited by 11 publications

References 14 publications

Kinetics and Mechanism of Lithium Extraction from α-Spodumene in Potassium Hydroxide Solution

Kinetics and Mechanism of Lithium Extraction from α-Spodumene in Potassium Hydroxide Solution

Separation of Zr and Si in Zirconium Silicate by Sodium Hydroxide Sub-Molten Salt

Niobium and tantalum recovery from the primary source and from tin slag, an industrial challenge: A review

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