镍改性钛系锂离子筛的制备及性能研究
收稿日期: 2024-08-13
网络出版日期: 2024-10-18
Study on preparation and performance of Ni-modified titanium-based lithium ion sieve
Received date: 2024-08-13
Online published: 2024-10-18
针对钛系锂离子筛（H2TiO3）在周期循环过程中存在溶损，导致循环性能较差的问题，研究通过金属离子掺杂改变晶格结构来提升稳定性。采用球磨混料，经过高温固相反应和离子交换，制备了镍改性钛系锂离子筛（Ni-HTO），探究了镍掺杂对吸附剂的结构、吸附性能及稳定性的影响，并考察了其在盐湖提锂领域中的适用性，为实际应用提供参考。结果表明：Ni掺杂有效降低了偏钛酸离子筛中Ti4+的溶出；此外，镍改性离子筛的（002）晶面间距有所减小，对Li+的吸附选择性显著提升，其中Li+对Mg2+的分离因子达到了281.23，且饱和吸附量为30.5 mg/g。成型后的颗粒吸附剂（Ni-HTO）用于拉果错盐湖卤水提锂测试，经20次循环吸附，对Li+的吸附容量保持在9.55 g/L左右，平均Ti4+溶损率由改性前的0.68%降低至0.20%，且平均选择性显著提升，表明其具备优异的吸附性能、循环稳定性及选择性。综上，镍改性钛系锂离子筛在盐湖提锂领域具有较大的应用潜力。
陈蒙蒙 , 徐德刊 , 黄继龙 , 唐志兰 , 张许 , 谭超 , 王肖虎 , 彭文博 . 镍改性钛系锂离子筛的制备及性能研究[J]. 无机盐工业, 2025 , 57(9) : 37 -45 . DOI: 10.19964/j.issn.1006-4990.2024-0446
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
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