Recycling method of waste nickel cobalt manganese lithium ternary battery positive electrode material
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A technology of nickel-cobalt lithium manganate and ternary battery, which is applied in the field of recycling and utilization of waste nickel-cobalt lithium manganate ternary battery cathode materials, can solve problems such as difficulty in enlarging production and filtering, and achieves reduction of production cost, improvement of recovery rate, Realize the effect of resource recycling
Pending Publication Date: 2020-04-28
宁夏百川新材料有限公司
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[0007] The technical problem to be solved in the present invention is to overcome the above technical defects and provide a method for recycling the positive electrode material of the waste nickel-cobalt lithium manganese oxide ternary battery. Amplify the problem of difficult filtration in production, and at the same time greatly improve the recovery rate of valuable metal elements
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Embodiment 1
[0031] Take 25g of ternary powder, add it into 80ml of 0.25mol / L dilute sulfuric acid solution, stir at 200-800r / min, add hydrogen peroxide drop by drop, react for 2h and filter to obtain leachate. The analysis results of the leachate are shown in Table 1; g iron powder, stirred and reacted at 50 degrees for 30 minutes, filtered to obtain the copper-removed liquid; the copper-removed liquid was added with 6g of 85% phosphoric acid, stirred and slowly added dropwise 6ml of industrial hydrogen peroxide, the reaction temperature was 45 degrees, and the dripping time was 60min; Add 1mol / L sodium hydroxide at this temperature to adjust the pH to 3, and the reaction time is 30min. Filter the iron-aluminum slag to obtain the iron-removing aluminum liquid. The content analysis results are shown in Table 1; add 30ml of P204 with a saponification rate of 65% to the iron-removing aluminum liquid. , control the water phase equilibrium pH=2.8, obtain purification solution after 3 stages of ...
Embodiment 2
[0033]Take 25g of ternary powder, add it to 120ml 0.5mol / L dilute hydrochloric acid solution, stir at 200-800r / min, add 10ml 1mol / L sodium sulfite solution to react for 2.5h, then filter to obtain leachate; add 1g iron powder to the leachate, Stir and react at 60°C for 20min, filter to obtain the solution after copper removal; add 15ml of 30wt% diammonium hydrogen phosphate solution to the solution after copper removal, stir and slowly add 6ml of industrial hydrogen peroxide dropwise, the reaction temperature is 50°C, and the dripping time is 90min; Add 1mol / L sodium carbonate solution at this temperature to adjust the pH to 2.8, and the reaction time is 60min. Filter the iron-aluminum slag to obtain the iron-removing aluminum solution; add 40ml of P204 with a saponification rate of 70% to the iron-removing aluminum solution to control the equilibrium pH of the water phase= 2.5, the purification solution is obtained after three-stage countercurrent extraction; add appropriate a...
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Abstract
The invention discloses a recycling method of a waste nickel cobalt manganese lithium ternary battery positive electrode material. The method comprises the following steps that: 1) acid leaching is performed, specifically, a powder material containing a ternary positive electrode material, negative electrode powder, copper-aluminum powder, iron and other elements is added into dilute acid, and a reducing agent is also added into the dilute acid, and agitation leaching is performed, so that a leachate containing nickel, cobalt, manganese, aluminum, lithium, copper and iron can be obtained; 2) copper removal is performed, specifically, iron powder is added into the leachate, the iron powder reacts with the leachate at a certain temperature, and filtering is performed, so that a copper-removed liquid is obtained; 3) iron and aluminum removal is performed, specifically, a phosphoric acid compound is added into the copper-removed liquid, dilute alkali is added into the copper-removed liquidat the same time, so that the pH value of the liquid can be adjusted to 2.5-3.5, and iron and aluminum can be removed; 4) P204 extraction and impurity removal is performed; 5) a nickel-cobalt-manganese ternary precursor is prepared; and 6) a lithium-containing liquid is added to a saturated sodium carbonate solution, so that evaporation and concentration are performed, so that lithium carbonate powder can be obtained. The recovery rate of nickel, cobalt, manganese and lithium is higher than 95%; the purity of the obtained nickel, cobalt, manganese ternary precursor and the lithium carbonate is high; and the nickel, cobalt, manganese ternary precursor and lithium carbonate can be directly used for preparing ternary battery materials, and resource recycling is truly achieved.
Description
technical field [0001] The invention relates to the technical field of battery recycling, in particular to a method for recycling the positive electrode material of a waste nickel-cobalt-lithium-manganese-oxide ternary battery. Background technique [0002] With the rapid growth of the electric vehicle industry, according to the forecast of the China Automotive Technology Research Center, by 2020, the annual cumulative scrapping of electric vehicle power trams in my country will reach a scale of 323,000 tons. The forecast shows that the scale will reach 5 billion yuan in 2018, 13.6 billion yuan in 2020, and 31.1 billion yuan in 2023. [0003] Power batteries do not contain toxic heavy metal elements such as mercury, cadmium, and lead, but they can also cause environmental pollution. For example, heavy metals in battery cathode materials can increase the pH value of the environment, and improper handling can also produce toxic gases. In addition, the power battery contains a...
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