METHOD OF RECYCLING COBALT FROM COBALT CONTAINING WASTES

摘要

PURPOSE: A cobalt collection method of cobalt contained in waste is provided to separate cobalt by extracting cobalt malate from cobalt in leach liquor through a process which injects additionally malic acid to the leach liquor, thereby simplifying the old separated process for the extraction of cobalt. CONSTITUTION: A cobalt collection method of cobalt contained in waste comprises a diffusion process of injecting crushed waste containing cobalt into the leach liquor including malic acid, formic acid and water, and pressurizing the leach liquor with the waste containing cobalt to be diffused. The concentration of the malic acid is 0.2-5M. The pressure of the diffusion process is 0.5-5.0 bar. The formic acid included in the leach liquor is 5-20v%(volume percent). The temperature of the diffusion process is 60-180°C. The step of extracting cobalt malate from malic acid is additionally included by adding malic acid to the leach liquor whose cobalt is extracted. The step of generating cobalt oxide with the heat treatment of cobalt malate is also included. The step of manufacturing LiCoO2 by mixing and heat-treated cobalt malate and LiCO2 is added. The amount of the malic acid additionally added is 5M or less. [Reference numerals] (AA) Cobalt extracting efficiency(%); (BB) Malic acid; (CC) Citric acid; (DD) No reductant; (EE) Formic acid; (FF) Formic acid + autoclave