Method for treating waste secondary battery

Abstract

The invention belongs to the technical fields of wet metallurgy and chemical industry production and discloses a method for treating a waste secondary battery. The method comprises the following steps: performing two-stage combustion in a rotary kiln, maintaining the furnace temperature to be at 100-150 DEG C, roasting the waste secondary battery on the furnace front, and remaining for 30-60 minutes to ensure that a sealing ring in the waste secondary battery is fully pyrolyzed and damaged, so that hydrogen and an organic solvent in the battery are released; and burning the materials in a hearth on the rear of a combustion chamber of the furnace body, maintaining the temperature to be at 300-500 DEG C, fully oxidizing, pyrolyzing and burning organic matters in the wastes, and effectively controlling generation of ozone and nitrogen oxides, so that the produced gas achieves the odor-free, stink-free and completely-combusted effects. The treatment method provided according to the invention is reasonable in design, the operations of burning and breaking are sequentially performed, the breakage rate is high, the recycling rate of valuable elements is high, a high-temperature burning explosion accident can be avoided, and the method is safe, pollution-free and suitable for popularization.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and chemical production, and in particular relates to a treatment method for waste secondary batteries. Background technique [0002] Due to its high energy density, light weight, long life and other excellent characteristics, secondary batteries are widely used in communication tools such as mobile phones, notebook computers, digital cameras, digital electronic products, electric tools, electric vehicles and other fields. my country has become the world's largest Secondary battery production and consumption countries. [0003] With the increasing demand for secondary batteries, the contradiction between supply and demand of metal raw materials such as cobalt, nickel, and lithium required for the production of secondary batteries will become more prominent; on the other hand, valuable metals such as cobalt, nickel, and manganese in waste secondary batteries High content, many toxic and har...

AI Technical Summary

Problems solved by technology

[0003] With the increasing demand for secondary batteries, the contradiction between supply and demand of metal raw materials such as cobalt, nickel, and lithium required for the production of secondary batteries will become more prominent; on the other hand, valuable metals such as cobalt, nickel, and manganese in waste secondary batteries High content, many toxic and harmful compounds, if a large number of waste secondary batteries cannot be safely disposed and utilized, it will cause waste of resources and serious environmental pollution problems

It adopts the process of first crushing and then incineration, the crushing efficiency is low, the recovery rate of valuable elements is low, and the organic matter and electrolyte in the battery are easy to leak and pollute the environment, posing a great safety hazard

[0007] At the same time, when recycling waste secondary batteries, it is usually necessary to open the battery casing and recycle the materials in the battery casing, because the secondary battery casing has great strength and toughness, and is compatible with the active material in the casing. Closely bonded together, they may explode when heated or squeezed, making crushing difficult, especially when working in large batches

Although most of the treatment processes given in the existing waste secondary battery recycling patents mention battery fragmentation, the formulations are vague and often have no reference value

Images