铝基锂吸附剂造粒工艺优化及其原卤提锂性能研究

doi:10.19964/j.issn.1006-4990.2024-0155

Abstract

Abstract:

Currently，Al-based lithium adsorbent has been employed for large-scale industrial application，due to its high selectivity in original brine and fast adsorption rate using water elution，but it is also necessary to further improve absorption capacity and cycling performance.In this study，layered double hydroxide LiAl₂（OH）₇•2H₂O（LDH） powders were prepared based on a homogeneous precipitation process using urea precipitant，and injection granulation was performed to obtain adsorbent particles，and the adsorption performance，structural stability performance and recycling performance were investigated.The results showed that cellulose acetate and NaHCO₃ could be considered as the proper binder and porogenic agent，respectively.The static adsorption process proved that the adsorption capacities of powdery and granulated LDH were 7.90 mg/g and 7.40 mg/g，respectively.It was shown that the porous loading structure after granulation effectively improved the problem of binder-embedded active sites，and the adsorption capacity was not significantly decreased.In addition，the dynamic adsorption and recycling performance of GLDH-1 was tested，and the dynamic lithium adsorption kinetics to the original brine of Jiezhe Caka Salt Lake conformed to the pseudo-secondary adsorption behavior，and the GLDH-1 could still maintain 77% of the initial capacity after 15 cycles.In short，the injection granulation technique using cellulose acetate binder and NaHCO₃ porogenic agent could effectively improve the Li-extraction performance of aluminum-based lithium adsorbent particles.

Key words: Al-based lithium adsorbent, layered double hydroxide, porogenic agent, injection granulation

CLC Number:

TQ133.1

WANG Minrui, TIAN Guiying, ZHANG Ao, GE Junjie, ZHANG Lei, XIANG Jun, TANG Na. Study on granulation optimization for Al-based lithium adsorbent and its lithium recovery performance from brine[J]. Inorganic Chemicals Industry, 2025, 57(3): 36-42.

Figures/Tables 10

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References 15

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离子	C₀/ （mg·L^-1）	C_e/ （mg·L^-1）	Q_e/ （mg·g^-1）	K/ （L·g^-1）	α
Li⁺	193.83	3.91	7.59	1.95	1.00
Mg²⁺	280.03	249.50	1.22	4.90×10^-3	397.92
K⁺	2 845.13	2 839.00	0.48	1.69×10^-4	11 517.12
Na⁺	49 950.00	49 939.51	0.84	1.68×10^-5	115 992.87

黏合剂类型	w（黏合剂）/ %	吸附容量/ （mg·g^-1）	质量保持率/%
SA	10	3.71	98.98
	15	3.48	99.77
	20	2.89	99.90
PVC	10	3.03	97.83
	15	2.78	99.89
	20	2.35	99.91
CA	10	4.45	99.71
	15	3.56	99.95
	20	2.85	99.96

样品	成孔剂	比表面积/（cm²·g^-1）	孔体积/ （cm³·g^-1）	孔径/ nm
LDH	—	126.00	0.01	7.70
GLDH-0	—	99.51	0.09	11.70
GLDH-1	NaHCO₃	112.45	0.35	19.10
GLDH-2	NaCl	110.32	0.46	17.62

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Inorganic Acid-Base-Salt Committee of CIESC

Study on granulation optimization for Al-based lithium adsorbent and its lithium recovery performance from brine

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