镍改性钛系锂离子筛的制备及性能研究

doi:10.19964/j.issn.1006-4990.2024-0446

Abstract

Abstract:

In order to solve the problem of poor cycling performance caused by the dissolution loss of titanium-based lithium ion sieves（H₂TiO₃） during periodic cycling，it was aimed to improve the stability by changing the lattice structure with metal ion doping.The Ni-modified titanium-based lithium ion sieve（Ni-HTO） was prepared by utilizing ball milling for mixing，followed by high-temperature solid-state reaction and ion exchange.The effects of nickel doping on the structure，adsorption performance，and stability of the adsorbent were investigated，and its applicability in lithium extraction from salt lakes was assessed to provide insights for practical applications.The results showed that the dissolution of Ti⁴⁺ in the metatitanic acid ion sieve was reduced after Ni doping.Furthermore，the（002） interplanar spacing of the Ni-modified ion sieve was decreased，which significantly improved the adsorption selectivity for Li⁺.Specifically，the separation factor of Li⁺ to Mg²⁺ reached 281.23，with a saturated adsorption capacity of 30.5 mg/g.The granulated adsorbent（Ni-HTO） was used in the lithium extraction test of Laguocuo Salt Lake brine.The results showed that the adsorption capacity for Li⁺ remained around 9.55 g/L，the average Ti⁴⁺ dissolution loss rate was decreased from 0.68%（unmodified） to 0.20%，and the average selectivity was significantly improved after 20 cycles，which indicated that Ni-HTO had excellent adsorption properties，cyclic stability and selectivity.In summary，the Ni-modified titanium-based lithium ion sieve had great application potential in the field of lithium extraction from salt lakes.

Key words: adsorbent, titanium-based lithium ion sieve, doping, stability, salt lake brine

CLC Number:

TQ138.13

CHEN Mengmeng, XU Dekan, HUANG Jilong, TANG Zhilan, ZHANG Xu, TAN Chao, WANG Xiaohu, PENG Wenbo. Study on preparation and performance of Ni-modified titanium-based lithium ion sieve[J]. Inorganic Chemicals Industry, 2025, 57(9): 37-45.

Figures/Tables 13

Table 1

Fig.1

Table 2

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Table 3

Table 4

Separation effect of HTO and 0.01Ni-HTO on main metal ions in brine"

阳离子	HTO					0.01Ni-HTO
阳离子	ρ₀/（g·L^-1）	ρ_e/（g·L^-1）	K_d/（mL·g^-1）	$α N L i$	F_e/（mL·g^-1）	ρ₀/（g·L^-1）	ρ_e/（g·L^-1）	K_d/（mL·g^-1）	$α N L i$	F_e/（mL·g^-1）
Li⁺	0.24	0.14	142.86	1.00	82.54	0.24	0.16	109.68	1.00	64.41
Na⁺	12.98	12.75	3.61	39.57	3.54	12.98	12.93	0.70	156.69	0.77
K⁺	2.03	1.99	2.91	49.16	3.46	2.03	2.01	0.55	199.42	1.09
Mg²⁺	0.76	0.69	21.19	6.74	18.90	0.76	0.76	0.39	281.23	0.79

Table 4

Fig.9

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前驱体	前驱体三强峰的偏移角度/（°）
前驱体	（002）	（-131）	（-133）
LTO	0	0	0
0.01Ni-LTO	0.034	-0.023	-0.081
0.03Ni-LTO	0.035	-0.024	-0.082

准一级动力学拟合参数				准二级动力学拟合参数
k₁/h^-1	q_e/（mg·g^-1）	R²		k₂/（mg·g^-1·h^-1）	q_e/（mg·g^-1）	R²
0.211	16.88	0.928		0.030	28.30	0.998

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation and performance of Ni-modified titanium-based lithium ion sieve

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