HIGH-RATE RECOVERY OF VALUABLE METALS SUCH AS COBALT AND LITHIUM FROM WASTE LITHIUM SECONDARY BATTERIES

摘要

The present invention that it relates to a method for recovering valuable metals such as cobalt and lithium as high purity from the waste lithium ion secondary battery, and more particularly, by using a sodium hydroxide and additives separate the aluminum in the liquid phase to the waste lithium ion secondary battery aluminum melting process, the mineral acid leaching process, the first neutralization step for adding a neutralizing agent to solid-liquid separation, and then adjusted to pH 3.0 ~ 4.5 iron and aluminum or the like to dissolve the residue of leaching the dissolved residue with an inorganic oxide and a reducing agent in a liquid state, the strong alkali of was added to the second neutralization step to separate the copper or the like at pH 4.8 ~ 5.6, that is configured to re-pulping process, the solvent extraction process for separating lithium and cobalt to handle the dissolved residue and to its features, especially waste lithium ion secondary prior to leaching the aluminum cell with an inorganic acid in a subsequent process by separating dissolved aluminum by using caustic soda and additives Minimize the process load due to, and through a two-stage neutralizing process for efficiently separating a metal such as iron, aluminum, copper, and to minimize the amount of neutralizing agent, and Lee pulping step and the solvent extraction process the recovery rate and purity of the cobalt over the a is to be provide a means to increase.