Comprehensive recovery method of waste sodium-ion battery

Abstract

The invention discloses a comprehensive recovery method of waste sodium-ion batteries, which comprises the following steps: mixing and grinding battery black powder and a pre-leaching agent, adding a reducing agent and ammonia liquor for leaching, carrying out solid-liquid separation to obtain a leachate and a solid, adding acid into the solid for dissolving, carrying out solid-liquid separation to obtain carbon residue and filtrate, adding alkali into the filtrate for adjusting pH, and separating to obtain aluminum hydroxide, alkali is continuously added into the filtrate to adjust the pH, manganese hydroxide is obtained through separation, a first oxidizing agent, a chelating agent and alkali are added into the leachate, ammonia distillation and solid-liquid separation are carried out, and a cobalt-containing insoluble substance and a nickel-containing chelate solution are obtained. According to the method, the battery black powder and the pre-leaching agent are subjected to ammonia leaching, Mn and Al in a reaction system are precipitated, Na, Ni and Co are still stored in the leaching agent, the separation and recovery difficulty of valuable metal compounds in the leaching agent can be reduced, the subsequent precipitation and separation procedures are greatly reduced, then a chelating agent and nickel are utilized for generating a chelate, nickel and cobalt in the solution coexist in the form of different substances, and the separation efficiency is improved. Therefore, high-efficiency separation of nickel and cobalt is realized.

Description

technical field [0001] The invention belongs to the technical field of battery recycling, and in particular relates to a comprehensive recycling method for waste sodium ion batteries. Background technique [0002] Waste sodium-ion batteries (NIBs) contain a large amount of valuable substances, such as sodium, manganese, nickel, cobalt, etc., which have serious impacts on the environment if not properly disposed of. Batteries become an important research aspect in the field of resource recycling. [0003] At present, the methods for recovering valuable metals from waste batteries can be roughly divided into direct regeneration, hydrometallurgy, and pyrometallurgy. The direct regeneration method includes hydrothermal regeneration and solid phase regeneration, both of which have strict requirements on the purity of waste positive and negative electrode materials, which limits its application in the treatment of waste batteries containing a large amount of impurities. Various ...

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Problems solved by technology

In the hydrometallurgical process, on the one hand, based on the principle of thermodynamics, reducing agents such as hydrogen peroxide, starch, and glucose are generally added to the wet leaching system. Although the addition of reducing agents can effectively increase the reaction temperature and leaching efficiency, the acid leaching The system will inevitably be affected, and it is easy to cause secondary pollution, such as the production of toxic gas acid gas (Cl 2 , SO 2 , NO x ), organic wastewater and thus poses a threat to the environment

On the other hand, carbonaceous materials (such as carbon-based negative electrode materials, conductive agents, binders, separators) can convert waste battery positive electrode materials into metal elements or metal oxides, and a considerable part of carbonaceous materials will inevitably remain. Reduction of roasted waste metals in roasting will lead to the complexity of subsequent separation and excessive use of chemical reagents for leaching, reducing the recovery rate and the efficiency and purity of valuable metals obtained, which will also further increase the recycling cost of batteries and reduce the target Quality of products

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