Preparation of λ-MnO₂ by column method and its ion-sieve property

Abstract

λ-MnO₂ was prepared by column method from normal spinel LiMn₂O₄ with purity of 99.38%. The influence of LiMn₂O₄ grain size and acidity of leaching solution on the lithium leaching process was studied. The results show that the appropriate range of LiMn₂O₄ grain size was 60–160 meshes and the concentration of leaching solution HCl was 0.1 mol·L⁻¹. The adsorption capacity Q of λ-MnO₂ for lithium increased with the increase of pH and changed markedly at pH 6.0–10.0. It was 3.80mmol/g at pH 12.0 The distribution coefficients K_d of Li⁺ and Na⁺ were 3.406×10⁴ and 2.300 respectively, and the separation coefficient a_Na ^Li was 1.481 ×10⁴ at pH 6.5. As a result, λ-MnO₂ is a high performance ion-sieve material for lithium ion.

Keywords

λ-MnO₂ / column method / lithium manganese composite oxid / ion-sieve material

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