PURPOSE: To prepare an adsorbent having high selective adsorbing capacity to Li by heating a ground mixture of an Li-compound and an Mn-compound to 350°C or higher and eluting Li from the formed Li-containing Mn-oxide using an acid.
CONSTITUTION: A lithium compound and a manganese compound ground into a predetermined particle size are mixed so that the ratio of number of moles of lithium to that of manganese becomes about 0.1 - 1.0. This ground mixture is heat-treated at 350°C or higher, pref., at about 400°C or higher to synthesize lithium-containing manganese oxide. Subsequently, this oxide is treated at about 70°C or lower using an acidic solution with pH of about 3 or less, pref., about 0.1N or more mineral acid to elute lithium, in order to prepare a lithium adsorbent. When treatment is performed at about 70°C or lower, residual lithium is reduced to obtain a lithium adsorbent more excellent in adsorbing capacity.
MIYAI YOSHITAKA
SAKAKIBARA JITSUO
NISHIMURA TOMONOBU
KUMAMOTO JUNJI
KAMEOKA YOSHIBUMI
MATSUMOTO NORIO
KAMAYA GENICHIRO
KOBE STEEL LTD
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