钛系吸附剂在西藏碳酸盐型盐湖中的应用研究

doi:10.19964/j.issn.1006-4990.2023-0226

Abstract

Abstract:

Due to its high adsorption capacity，excellent selectivity，long life and high stability，titanium adsorbent has a useful application prospect in lithium extraction from carbonate salt lake in Tibet.The process effects of titanium adsorbent in carbonate-type salt lakes in Tibet were investigated by using the rotary table continuous ion exchange device，and its multi-cycle adsorption performance and stability were examined.The results showed that a high feed Li⁺ mass concentration could effectively increase the adsorption driving force and thus improve the adsorption capacity.When an optimized allocation of adsorption columns was used，combined with a feed flow rate of 10 BV/h，a water-rinse brine flow rate of 8 BV/h，and a water-rinse acid flow rate of 8 BV/h，the adsorption capacity reached 7.53 mg/g，while the average lithium concentration in the desorption liquid was 1 500 mg/L，and the average selectivity was S_（Li/Na）=4.67，S_（Li/K）=36.48，S_（Li/Ca）=13.49，and S_（Li/Mg）=32.51，demonstrating high adsorption and resolution efficiency.In addition，the desorption series- and parallel-connection modes had little impact on the lithium mass concentration in desorption liquid but mainly affected the pH of the desorption liquid，which could be adjusted according to actual project requirements.

Key words: titanium system adsorbent, rotary table continuous ion exchange device, stability, lithium extraction, adsorption separation

CLC Number:

TQ424.2

JI Ying, ZHANG Ying, HOU Xuechao, ZHU Xiaofeng, JIANG Run, PENG Wenjuan, SUN Guangdong, LÜ Long. Application research of titanium adsorbent of carbonate-type salt lake in Tibet[J]. Inorganic Chemicals Industry, 2023, 55(11): 70-77.

Figures/Tables 18

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ρ（Li⁺）	ρ（Na⁺）	ρ（Mg²⁺）	ρ（K⁺）	ρ（Ca²⁺）	ρ（Si⁴⁺）
225	17 014	717	2 451	25	12
ρ（B³⁺）	ρ（Cl^-）	ρ（SO₄^2-）	ρ（CO₃^2-）	TDS
781	52 362	5 060	18 830	135 560

ρ（Li⁺）	ρ（Na⁺）	ρ（Mg²⁺）	ρ（K⁺）	ρ（Ca²⁺）	ρ（Si⁴⁺）
240	15 300	2 230	760	23	10
ρ（B³⁺）	ρ（Cl^-）	ρ（SO₄^2-）	ρ（CO₃^2-）	TDS
600	52 360	5 060	18 830	135 000

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Application research of titanium adsorbent of carbonate-type salt lake in Tibet

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