Showing papers by "Kenta Ooi published in 1986"
TL;DR: Ion-sieve (microporous) type manganese oxide (HMnO) was prepared by acid treatment of lithium-introduced MANGANESE oxide which was obtained from γ-type manganous oxide and lithium hydroxide as mentioned in this paper.
Abstract: Ion-sieve (microporous) type manganese oxide (HMnO) was prepared by acid treatment of lithium-introduced manganese oxide which was obtained from γ-type manganese oxide and lithium hydroxide. The HMnO showed high selectivity for lithium ions in seawater. The maximum lithium uptake by the HMnO from seawater reached 7.8 mg/g which corresponded to a lithium content of 1.7% as Li2O. The adsorbed lithium could be easily eluted with 0.01 or 0.05 M hydrochloric acid solution. The adsorptive capacity for lithium ion scarcely changed during five repetitions of the adsorption-elution cycle. The column test was carried out by using granulated HMnO which was prepared with polyacrylic hydrazide as a binder.
85 citations
Patent•
13 Feb 1986
TL;DR: In this paper, an an adsorbent for lithium in an aqueous medium capable of adsorbing the lithium value even when the concentration of lithium in the annealing medium is very low as in natural sea water so as to give an adsorbed amount of lithium on the adorbent comparable to the content in some low grade lithium ores.
Abstract: The invention provides an adsorbent for lithium in an aqueous medium capable of adsorbing the lithium value even when the concentration of lithium in the aqueous medium is very low as in natural sea water so as to give an adsorbed amount of lithium on the adsorbent comparable to the content in some low-grade lithium ores. The inventive adsorbent is prepared by the steps comprising (a) impregnating a manganese compound with an alkali, e.g. sodium and potassium, or akaline earth, e.g. magnesium and calcium, metal compound by the adsorption of the impregnant in an aqueous solution on to a water-insoluble manganese compound, coprecipitation of manganese and the impregnant element by admixing aqueous solutions of compounds thereof or powder blending of a manganese compound and an impregnant compound, (b) heat-treating the thus impregnated manganese compound at a temperature sufficiently high to form a composite compound between manganese and the impregnant element and (c) leaching the constituent of the impregnant out of the composite manganese compound after the heat treatment using an acid.
9 citations