氯化锂溶液中钾离子的吸附分离研究

doi:10.19964/j.issn.1006-4990.2023-0498

Abstract

Abstract:

Lithium chloride products，as primary raw materials，have been affected in their application，as well as in the development of metal lithium and series products prepared due to the high content of potassium，sodium and calcium.The adsorption of potassium ions in lithium chloride solution containing sodium was studied by static adsorption experiments using hydrothermal synthesis of silicoaluminate molecular sieves.The effects of contact time，temperature，initial potassium concentration，pH and ionic strength on adsorption of potassium ions by molecular sieves were investigated.The adsorption kinetics and thermodynamics of potassium ions by molecular sieves were studied and analyzed.The results showed that molecular sieves had selective adsorption for potassium ions with fast rate，the adsorption capacity reached to 56 mg/g after 30 min at the conditions of initial potassium concentration 0.005 mol/L and 25 ℃，which was close to adsorption equilibrium capacity.Initial potassium concentration and ionic strength had a great impact on adsorption equilibrium capacity of potassium ions by molecular sieves.Based on the analysis of thermodynamics and kinetics，the adsorption of potassium ions by molecular sieves was exothermic reaction and conformed to the Freundlich adsorption isotherm model.Low temperature was benefical for adsorption.The adsorption process followed a quasi second order kinetic model and adsorption arte was determined by multiple control steps together.In addition，molecular sieves showed better desorption efficiency and re-adsorption capacity for potassium ions.

Key words: molecular sieve, adsorption, potassium ion, lithium chloride solution

CLC Number:

TQ131.11

ZHU Zenghu, WANG Min, PENG Zhengjun, JIA Guofeng, LI Yan. Study on adsorption of potassium ions in lithium chloride solution[J]. Inorganic Chemicals Industry, 2024, 56(6): 61-66.

Figures/Tables 17

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接触时间/min	分配系数/（mL·g^-1）
接触时间/min	K⁺	Li⁺
5	780.74	0.09
10	851.74	4.27
30	899.12	5.15
60	909.52	6.98
120	944.19	3.70
180	938.63	9.53

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Study on adsorption of potassium ions in lithium chloride solution

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