A kind of waste lithium ion battery recovery method

Abstract

The invention belongs to the technical field of waste battery treatment, and specifically discloses a method for recycling waste lithium ion batteries: roasting raw materials to be recovered and additives containing waste positive electrode active materials at a temperature of 500-800°C, and then carrying out water extraction processing; the auxiliary agent is NaHSO 4 、KHSO 4 、CoSO 4 、NiSO 4 , MnSO 4 , NH 4 HSO 4 , (NH 4 ) 2 SO 4 at least one of the The method overcomes the disadvantages of the traditional recycling method, is simple, practical and economically feasible, realizes the comprehensive utilization of waste lithium-ion batteries, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of recycling waste lithium ion batteries, in particular to a method for recycling waste and old positive electrode active materials. Background technique [0002] With the rapid development of modern science and technology, the problem of social energy and environmental ecological pollution has become increasingly prominent, and the environmental and ecological pollution of various waste batteries has become the focus of social attention. Lithium-ion batteries are widely used in power batteries and energy storage batteries due to their high capacity, stable cycle performance, and high working platform voltage. Power and energy storage batteries usually require more battery materials than conventional small batteries. Therefore, in the next 3-5 years, a large number of lithium-ion batteries will be scrapped, and their recycling has high social value. [0003] However, there are still defects in the current domestic te...

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Problems solved by technology

[0003] However, there are still defects in the current domestic technical route for recycling waste lithium-ion batteries. The mainstream way to deal with the electrode active materials of waste lithium-ion batteries is acidic reduction leaching to obtain Li + 、Ni 2+ 、Co 2+ , Mn 2+ 、Al 3+ and Fe 3+ Plasma leaching solution, precipitation and removal of iron and aluminum, and then adjusting the pH value to obtain a single metal precipitate or nickel-cobalt-manganese precursor, and finally Li 2 CO 3

Such as Chinese patent CN 104538695 A published "recovering valuable metals in nickel-cobalt lithium manganese oxide battery and preparing method for nickel-cobalt manganese oxide lithium" utilizes acid leaching method to recover valuable metals in nickel-cobalt lithium manganate waste batteries, first use Inorganic acid leaching electrode active materials to obtain leaching solution, precipitation to remove iron and aluminum, then adding alkali to control different pH values ​​to obtain the precipitate corresponding to a single metal, and finally recovering lithium. This method realizes the recovery of waste ternary lithium-ion batteries. However, there is the problem that the purity of the recovered product is not high, and the non-degradable inorganic acid wastewater generated during the acid leaching process causes secondary pollution

Another example is the "recycling method of waste lithium-ion battery positive electrode powder" published by Chinese patent CN 201810834647.2, which uses inorganic acid and hydrogen peroxide to leach the waste lithium-ion battery negative electrode material, then uses precipitation to purify and remove impurities, and finally uses an extractant to extract and separate Nickel salt, cobalt salt and manganese salt are obtained. This method realizes the recovery of waste ternary lithium-ion batteries, but the extraction and separation of nickel, cobalt and manganese will increase the production cost, and the long process and efficiency brought by the deep separation of manganese and cobalt cannot be avoided. low problem

[0004] The existing conventional positive electrode material recovery method is easy to cause loss of lithium, and the recovery rate of lithium is not high. In addition, the separation selectivity of Li and other metal elements is not high, which easily affects the quality of recovered products.

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