Study on high-performance granulation of lithium-ion sieve powder with polysulfone as binder
The size of the titanium-based lithium-ion sieve(β-H2TiO3)powder used for lithium extraction from salt lakes belongs to the micro-nano level,and it needs to be granulated and shaped in order to be used for column filling.In view of the actual application conditions of β-H2TiO3(lithium extraction in alkaline environment and lithium elution in acidic environment),this paper adopted acid-alkali resistant polysulfone(PSF)as the binder for droplet formation of β-H2TiO3 powder.By investigating the effects of PSF dosage,N,N-dimethylacetamide(DMAC)dosage,polyvinylpyrrolidone(PVP-K15)dosage,gel bath temperature and drop pinhole diameter on the properties of β-H2TiO3-PSF particles,the formula and process of drop pellet molding were determined.The volume adsorption capacity of the obtained β-H2TiO3-PSF particles for Li+was 4.70g/L,the bulk density was 0.455kg/L,and the volume adsorption capacity of the material still remained at 95％of the original value after 100 cycles.
titanium-based lithium-ion sievegranulationbinderporogenlithium extraction from salt lake
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