溶剂萃取法从低品位高黏土浸出液中提取锂的研究

doi:10.19964/j.issn.1006-4990.2022-0713

Abstract

Abstract:

Tributyl phosphate（TBP） was acted as extractant，Methyl isobutyl ketone （MIBK） was used as diluent，FeCl₃ played as co-extraction agent，and solvent extraction method was used to separate and extract lithium from high clay leaching solution.The effects of aqueous phase composition，the kinds of metal ion in loaded organic phase，AlCl₃ concentration in loaded organic phase，TBP concentration in organic phase，Fe/Li mass ratio，phase ratio and other factors on extraction performance were investigated.The experimental results showed that when the aqueous phase composition was determined as 0.028 8 mol/L LiCl+0.036 5 mol/L FeCl₃+2 mol/L AlCl₃，the metal ion in loaded organic phase was Al³⁺，the concentration of AlCl₃ in the loaded organic phase was 2 mol/L，the concentration of TBP was 50%，the molar ratio of Fe/Li was 1.7 and the phase ratio of（Volume ratio of organic phase to aqueous phase）2:1 the extraction effect was optimal.In order to realize the recycling of the loaded organic phase，3 mol/L HCl and 1 mol/L Na₂CO₃ were identified as the stripping and regeneration solution，respectively.In addition，in order to realize the efficient extraction of lithium resources，the three-stage counter-current cascade experiment was used to carry out the lithium cascade extraction experiment.After the cascade experiment，the extraction rate of lithium reached 99.72%.The experimental results indicated that TBP-MIBK-FeCl₃ extraction system could effectively separate and extract lithium from low grade and high clay leaching solution.

Key words: high clay leaching solution, solvent extraction, lithium extraction, TBP-MIBK-FeCl₃ extraction system

CLC Number:

TQ131.11

LI Huifang, WANG Xiao, BAI Youpeng, ZHANG Shixiang. Study on extraction of lithium from low grade high clay leaching solution by solvent extraction[J]. Inorganic Chemicals Industry, 2023, 55(10): 63-69.

Figures/Tables 11

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有机相	水相	锂萃取率/%
负载Mg有机相	0.028 8 mol/L LiCl+0.036 5 mol/L FeCl₃	0.00
负载Mg有机相	0.028 8 mol/L LiCl+2 mol/L AlCl₃	38.54
负载Mg有机相	0.028 8 mol/L LiCl+0.036 5 mol/L FeCl₃+2 mol/L AlCl₃	82.66

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Study on extraction of lithium from low grade high clay leaching solution by solvent extraction

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