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Method for extracting lithium carbonate from scrapped lithium iron phosphate battery positive electrode powder

A technology of lithium iron phosphate battery and waste lithium iron phosphate, which is applied in the direction of lithium carbonate;/acid carbonate, battery recycling, sulfate/bisulfate preparation, etc. Human body impact and other issues, to achieve the effect of good product quality, short process and low production cost

Active Publication Date: 2019-04-19
湖南天泰天润新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these methods, high-temperature roasting is used in the step of separating lithium iron phosphate from the aluminum current collector. During the high-temperature roasting process, due to the fluorine-containing oily binder PVDF in the pole piece, the pole piece is also mixed with Plastic separators, carbonate solvents and other substances, when roasted at high temperature, these substances will produce fluoride and carcinogenic dioxin gas, which will seriously pollute the environment and have a serious impact on the human body. The national environmental protection monitors this very strictly. Waste lithium batteries want to Incinerate a large amount of organic matter contained in it by high-temperature roasting, which is difficult to pass in terms of environmental protection

Method used

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  • Method for extracting lithium carbonate from scrapped lithium iron phosphate battery positive electrode powder
  • Method for extracting lithium carbonate from scrapped lithium iron phosphate battery positive electrode powder

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Step 1: Put 2kg of scrap lithium iron phosphate positive electrode into an electric heating grinding machine to separate positive electrode powder and aluminum. The electric heating time is 1.5 minutes, the heating temperature is 220°C, and the mesh number of lithium iron phosphate positive electrode powder is -400, accounting for 87%. , lithium iron phosphate positive electrode powder: aluminum particles = 80: 20, the weight of lithium iron phosphate positive electrode powder is 1.6 kg, and the aluminum particle is 0.4 kg. The composition is shown in Table 1.

[0033] Step 2: Obtain 1.6kg of lithium iron phosphate cathode powder, add water to the reaction tank at a solid-to-liquid ratio of 1:4.5 to make a slurry, then slowly add concentrated Sulfuric acid (pay attention to the sink, the time of adding acid should be controlled above 1h) to react without heating, the reaction time is 4h, then add limestone powder (CnCO3≥90%), adjust the pH value of the solution to 4, th...

Embodiment 2

[0039] Compared with Example 1, in step 2, 1.6 kg of lithium iron phosphate positive electrode powder separated from 2 kg of scrap lithium iron phosphate positive electrode sheet by electric heating rubbing machine, the difference is that water is added to the reaction at a solid-to-liquid ratio of 1:3 Slurry mixing in the tank, the process before and after is the same as in Example 1, the results are shown in figure 2 .

Embodiment 3

[0041] Compared with Example 1, in step 2, 1.6 kg of lithium iron phosphate positive electrode powder separated from 2 kg of scrap lithium iron phosphate positive electrode sheet by electric heating rubbing machine, the difference is that the ratio of positive electrode powder: acid = 1: 0.65 is added slowly Concentrated sulfuric acid, the leaching slag dry agent slag rate is 2.2 times that of positive electrode powder, the process before and after is the same as embodiment one, the results are shown in figure 2 .

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Abstract

The invention discloses a method for extracting lithium carbonate from scrapped lithium iron phosphate battery positive electrode powder. The method comprises the eight steps of preparation of positive electrode powder, circulating leaching, filtering and washing, and other five steps. The purpose of the present invention is to provide the method for extracting lithium carbonate from the scrappedlithium iron phosphate battery positive electrode powder. The method has the advantages of environmental protection, low energy consumption, low production cost, small dirt discharging capacity, highefficiency in realization of comprehensive utilization of resources, and meeting of industrial production.

Description

technical field [0001] The invention relates to the technical fields of secondary resource recycling and circular economy, and in particular relates to a method for extracting lithium carbonate from scrapped lithium iron phosphate battery cathode powder. Background technique [0002] As the secondary battery with the highest energy density among energy storage devices that can be applied on a large scale, lithium-ion batteries have covered most of the mobile communication and digital product markets, and have had an important impact on their technological progress. In recent years, with the performance With the improvement of the production level, lithium-ion batteries have begun to be used in the energy storage industry, green and environmentally friendly new energy electric vehicles and other electric vehicles, and have become a very important product in the new energy industry. The demand for lithium-ion batteries in the international and domestic markets The volume has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01D5/02H01M10/54
CPCH01M10/54C01D5/02C01D15/08Y02W30/84
Inventor 谭春波
Owner 湖南天泰天润新能源科技有限公司
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