Abstract: Provided is a method for processing lithium ion battery waste, which can effectively precipitate aluminum ions and iron ions in the solution by neutralization and relatively easily separate the precipitate. The method for processing lithium ion battery waste includes: a leaching step of leaching battery powder in an acid, the battery powder containing at least aluminum and iron and being obtained from lithium ion battery waste, and removing a leached residue by solid-liquid separation to obtain a leached solution containing at least aluminum ions and iron ions; and a neutralization step of adding phosphoric acid and/or a phosphate salt and an oxidizing agent to the leached solution, increasing a pH of the leached solution to a range of 2.0 to 3.5, precipitating the aluminum ions and the iron ions in the leached solution as aluminum phosphate and iron phosphate, respectively, and removing a neutralized residue by solid-liquid separation to obtain a neutralized solution.

Abstract: A method for heat-treating battery waste containing lithium includes: allowing an atmospheric gas containing oxygen and at least one selected from the group consisting of nitrogen, carbon dioxide and water vapor to flow in a heat treatment furnace in which the battery waste is arranged, and heating the battery waste while adjusting an oxygen partial pressure in the furnace.

Abstract: A method for processing positive electrode active material waste of lithium ion secondary batteries, the waste containing cobalt, nickel, manganese and lithium, the method including: a carbon mixing step of mixing the positive electrode active material waste in the form of powder with carbon to obtain a mixture having a ratio of a mass of carbon to a total mass of the positive electrode active material waste and the carbon of from 10% to 30%; a roasting step of roasting the mixture at a temperature of from 600° C. to 800° C. to obtain roasted powder; a dissolution step including a first dissolution process of dissolving lithium in the roasted powder in water or a lithium-containing solution, and a second dissolution process of dissolving the lithium in a residue obtained in the first dissolution process in water; and an acid leaching step of leaching a residue obtained in the lithium dissolution step with an acid.

Abstract: Provided is an apparatus for analyzing composition of electronic and electrical device part scraps which can determine a composition of part scraps in the electronic and electrical device part scraps in a short time, a device for processing electronic and electrical device part scraps, and a method for processing electronic and electrical device part scraps using those devices.