Development of a thermodynamic model for the Li2CO3-NaCl-Na2SO4-H2O system and its application

Wang, Junfeng; Wu, Xiaowang; Zhang, Suojiang

doi:10.1016/j.jct.2018.03.027

Cited by 20 publications

(13 citation statements)

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“…It is estimated that about 25 m 3 mother liquor of high Na/Li ratio is generated for one ton of Li 2 CO 3 manufactured by using the purified LiCl aqueous solution as raw material. 20 As of now, the mother liquor was not recycled and was directly discharged back into the saline lakes. Therefore, it is necessary to find an effective method to implement the effective utilization of lithium in the mother liquor from an economic and environmental point of view.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, only about 50% lithium can be recycled from the mother liquor using this route. 20 Some researchers found that the method of synergistic solvent extraction showed a great potential for separating lithium from the alkali aqueous solution with high sodium concentration. Among the extractants studied, β-diketones might be the most suitable for the recovery of Li from the high Na concentration solution.…”

Section: Introductionmentioning

confidence: 99%

“…According to the compositions of mother liquor provided by Qinghai CITIC Guoan Science and Technology Development Co., Ltd. in China, the concentrations of lithium and sodium are in the range of 1.4–2.0 g·L –1 and 55–62 g·L –1 , respectively. It is estimated that about 25 m 3 mother liquor of high Na/Li ratio is generated for one ton of Li 2 CO 3 manufactured by using the purified LiCl aqueous solution as raw material . As of now, the mother liquor was not recycled and was directly discharged back into the saline lakes.…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of these, the route of Li 2 CO 3 crystallization was designed. Unfortunately, only about 50% lithium can be recycled from the mother liquor using this route . Some researchers found that the method of synergistic solvent extraction showed a great potential for separating lithium from the alkali aqueous solution with high sodium concentration.…”

Section: Introductionmentioning

confidence: 99%

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Lithium Recovery from the Mother Liquor Obtained in the Process of Li₂CO₃ Production

Wang

Yang

Bai

et al. 2019

Ind. Eng. Chem. Res.

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It is important to find an effective way to separate lithium from the mother liquor obtained by the reaction of lithium chloride/lithium sulfate and sodium carbonate. A synergistic solvent extraction system containing 1-phenyl-3heptyl-1,3-propanedione (PHPD) and liquid mixture of trialkyl-phosphine oxides (Cyanex923) to separate lithium from the system of Li + +Na + +Cl − +CO 3 2− +H 2 O was developed. The pH of the aqueous solution showed an important effect on the lithium extraction. At pH 13.06, PHPD alone showed a high extractability of lithium, but the addition of Cyanex923 led to a high separation ability of lithium over sodium due to the synergistic extraction effect. For a single extraction, the extraction percentage of lithium was 97.83% from the solution with 1.39 g•L −1 Li and 68.97 g• L −1 Na using the extraction system containing 0.4 mol•L −1 PHPD and 0.2 mol•L −1 Cyanex923 at the A/O ratio of 1:1, initial aqueous pH of 13.06, and 293.15 K, and the separation factor of lithium over sodium reached 475.06. On the basis of the McCabe−Thiele diagram of lithium extraction, two stages need to be used to achieve the complete extraction of lithium with an A/O ratio of 1.8. The extracted lithium species obtained by the slope analysis method were LiES and LiES 2 , where E and S represent the deprotonated PHPD and Cyanex923, respectively. The electrospray ionization mass spectra (ESI-MS) further confirmed that another two main Li adducts existing in the organic phase were LiE and LiE(H 2 O). The extracted lithium could be completely stripped from the loaded organic solution with hydrochloride of 0.5 mol•L −1 at an A/O ratio of 1:1. All of these will provide a theoretical basis for lithium separation from the mother liquor obtained during the process of lithium carbonate production.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lithium Recovery from the Mother Liquor Obtained in the Process of Li₂CO₃ Production

Wang

Yang

Bai

et al. 2019

Ind. Eng. Chem. Res.

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“…Solubility and phase diagram are essential for the process design and operation, and the Li + , Na + //Cl – , CO 3 2– –H 2 O system is the fundamental system for lithium recovering from brine via the precipitation method. In order to fully understand the phase equilibrium characteristics of this system, the historical solubility data relied on the Li + , Na + //Cl – , CO 3 2– –H 2 O system and are collected and listed in Table . − From these data, we know that Cheng and Wang reported the solubility data of Li 2 CO 3 saturated in NaCl solution at temperature from 298.15 to 363.15 K. Deng and Yu reported the phase diagram of the Li + , Na + //Cl – , CO 3 2– –H 2 O system at 298.15 K and 273.15 K, respectively. Although the phase diagrams or solubility data for Li + , Na + //Cl – , CO 3 2– –H 2 O quaternary are rich, the phase diagram data at temperature for lithium precipitation processes are still lacking.…”

mentioning

confidence: 99%

Phase Equilibria and Phase Diagrams of the Li⁺, Na⁺//Cl^–, CO₃^2––H₂O System at 323.15 and 348.15 K

et al. 2021

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The solubility equilibrium of Li+, Na+//Cl–, CO3 2– −H2O quaternary systems at 323.15 K and 348.15 K was studied via the isothermal solubility equilibrium method, and the complete phase diagrams were obtained including the properties of liquid density and pH. Solid species of LiCl·H2O, Li2CO3, NaCl, and Na2CO3·H2O are found in the quaternary system at 323.15 K and 348.15 K, and one double salt of Li2CO3·Na2CO3 is found at 348.15 K. The liquid phase of two invariant points and five univariant curves at 323.15 and three invariant points and seven univariant curves at 348.15 K in the quaternary system is determined. Li2CO3 covers the largest solid phase region and is hardly influenced by temperature; Li2CO3–NaCl is a stable salt pair, and its cosaturated solubility is the least at the diagonal line of Li2CO3–NaCl.

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Combined recovery of valuable metals from LiFePO₄–LiCoO₂ system without adding oxidant and reductant

Ren

Zheng

et al. 2023

Can J Chem Eng

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Based on the oxidation of ferrous ions in lithium iron phosphate and reduction of trivalent cobalt ions in lithium cobaltate, an innovative combined recovery process of lithium iron phosphate and lithium cobaltate powders is proposed. The effects of leaching conditions on leaching performance are studied and the optimal leaching conditions are obtained. Under these conditions, the leaching efficiencies of lithium and cobalt ions reach up to 99.92% and 81.11%, respectively. After removing ferric ions from leachate, the cobalt and lithium ions are separately recovered from the leaching solution. The final precipitation rate of cobalt ions is up to 97.71% with the purity of cobalt oxalate as 99.94%. In addition, the precipitation rate of lithium ions is 78.54% and the purity of lithium carbonate reaches up to 99.94%. Finally, the reaction path and mechanism for the combined recovery of lithium iron phosphate–lithium cobaltate system are preliminary investigated.

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Development of a thermodynamic model for the Li2CO3-NaCl-Na2SO4-H2O system and its application

Cited by 20 publications

References 38 publications

Lithium Recovery from the Mother Liquor Obtained in the Process of Li₂CO₃ Production

Lithium Recovery from the Mother Liquor Obtained in the Process of Li₂CO₃ Production

Phase Equilibria and Phase Diagrams of the Li⁺, Na⁺//Cl^–, CO₃^2––H₂O System at 323.15 and 348.15 K

Combined recovery of valuable metals from LiFePO₄–LiCoO₂ system without adding oxidant and reductant

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Development of a thermodynamic model for the Li2CO3-NaCl-Na2SO4-H2O system and its application

Cited by 20 publications

References 38 publications

Lithium Recovery from the Mother Liquor Obtained in the Process of Li2CO3 Production

Lithium Recovery from the Mother Liquor Obtained in the Process of Li2CO3 Production

Phase Equilibria and Phase Diagrams of the Li+, Na+//Cl–, CO32––H2O System at 323.15 and 348.15 K

Combined recovery of valuable metals from LiFePO4–LiCoO2 system without adding oxidant and reductant

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Product

Resources

About

Lithium Recovery from the Mother Liquor Obtained in the Process of Li₂CO₃ Production

Lithium Recovery from the Mother Liquor Obtained in the Process of Li₂CO₃ Production

Phase Equilibria and Phase Diagrams of the Li⁺, Na⁺//Cl^–, CO₃^2––H₂O System at 323.15 and 348.15 K

Combined recovery of valuable metals from LiFePO₄–LiCoO₂ system without adding oxidant and reductant