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Chemistry for Sustainable Development

2012 year, number 1

Exchange of Lithium Isotopes in the System Aqueous Lithium Chloride Solution – Lithium and Aluminum Double Hydroxide

V. P. ISUPOV1, L. E. CHUPAKHINA1, I. M. BELOZEROV2 and A. B. ALEKSANDROV3
1 Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences,
Ul. Kutateladze 18, Novosibirsk 630128 (Russia)
isupov@solid.nsc.ru
2 JSC “State Specialized Design Institute”, Novosibirsk VNIPIET,
Ul. B. Khmelnitskogo 2, Novosibirsk 630075 (Russia)
3 JSC “Novosibirsk Chemical Concentrates Plant”,
Ul. B. Khmelnitskogo 94, Novosibirsk 630110 (Russia)
Keywords: isotopic exchange, lithium hydroxide, aluminium hydroxide
Pages: 49–53

Abstract

Isotopic exchange between the aqueous solution of lithium chloride containing 6Li isotope and the chloride form of double aluminium and lithium hydroxide synthesized from different aluminium hydroxide species was studied. It was demonstrated that the dependence of the level of isotopic exchange F(t) on time at the initial regions (the exchange level being less than 40 %) for the samples of double hydroxide obtained from crystalline gibbsite can be described by a diffusion equation: F(t) = (4/r0π1/2)D1/2t1/2. The diffusion coefficients of lithium are comparable with the coefficients of self-diffusion of singly charged alkaline ions in skeletal aluminosilicate such as mordenite. The exchange level for the samples of double hydroxide obtained from mechanically activated aluminium hydroxide under comparable experimental conditions is an order of magnitude greater than the exchange level for the samples synthesized from gibbsite. This is likely to be connected with a higher dispersion level of double hydroxide synthesized from mechanically activated aluminium hydroxide.