Method for recovering battery-grade iron phosphate from waste iron phosphate slag

A technology of iron phosphate slag and iron phosphate, which is applied in waste collector recycling, battery recycling, recycling technology, etc., can solve the problems of high content of Cu and Ni impurity metals and disordered crystal forms, and achieve low acid concentration and good morphology Regular, to achieve the effect of closed-loop regeneration

Pending Publication Date: 2020-12-08
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0004] The present invention aims to solve the technical problems of high content of Cu and Ni impurity metals in the remaining iron phosphate slag after recovery of lithium iron phosphate by existing hydrometallurgy, disordered crystal forms, and further treatment, and provides a method for reprocessing waste phosphoric acid Method for recovering battery-grade iron phosphate from iron slag

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  • Method for recovering battery-grade iron phosphate from waste iron phosphate slag
  • Method for recovering battery-grade iron phosphate from waste iron phosphate slag

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specific Embodiment approach 1

[0018] Specific implementation mode 1: This implementation mode is a method for recycling battery-grade iron phosphate from waste iron phosphate slag, specifically according to the following steps:

[0019] 1. Pour the iron phosphate slag to be treated into a single-necked flask, add an inorganic acid solution to immerse the iron phosphate slag to be treated, and then seal it; iron phosphate slag;

[0020] 2. Fix the single-necked flask in a constant temperature oil bath, keep it warm for 1h-10h at a temperature of 40°C-180°C and stirring. After heating, take out the single-necked flask and let it cool down to room temperature naturally. Separate and dry the solid residue;

[0021] 3. Put the sample obtained after drying in step 2 into a quartz crucible, place it in a tube furnace, and heat it at a temperature of 200° C. to 1200° C. for 1 h to 10 h to obtain battery-grade iron phosphate.

specific Embodiment approach 2

[0022] Embodiment 2: This embodiment differs from Embodiment 1 in that the inorganic acid solution described in step 1 is a mixture of one or more of sulfuric acid aqueous solution, hydrochloric acid aqueous solution, nitric acid aqueous solution and phosphoric acid aqueous solution. Others are the same as the first embodiment.

specific Embodiment approach 3

[0023] Embodiment 3: This embodiment is different from Embodiment 2 in that: the concentration of the inorganic acid solution described in step 1 is 1 mol / L˜6 mol / L. Others are the same as in the second embodiment.

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Abstract

The invention discloses a method for recovering battery-grade iron phosphate from waste iron phosphate slag, relates to a method for recovering battery-grade iron phosphate, and aims to solve the technical problems of high Cu and Ni impurity metal content, disordered crystal form and further treatment in the residual iron phosphate slag after lithium iron phosphate is recovered by the existing hydrometallurgy. According to the method, the waste iron phosphate slag is leached with inorganic acid and then calcined, and finally battery-grade iron phosphate is obtained and used for preparing lithium iron phosphate again. According to the method, a large amount of impurity metals are removed by searching proper inorganic acid types, aging time, concentration, calcining temperature and the likeso that the iron phosphate crystal form is recovered. By carrying out safe and effective resource recycling treatment on the waste iron phosphate slag, remarkable economic benefits can be obtained while energy conservation and environmental protection are achieved, and the method has important significance in upcoming lithium iron phosphate battery blowout type retirement recycling.

Description

technical field [0001] The invention relates to a method for recycling battery-grade iron phosphate. Background technique [0002] As a high-performance rechargeable green power source, lithium-ion batteries have been widely used in various portable electronic products, communication tools and electric vehicles in recent years. Among them, the batteries of new energy vehicles generally use NCM ternary batteries and lithium iron phosphate batteries. Generally, the working life of lithium iron phosphate battery is 5 to 8 years, and it will inevitably be decommissioned or scrapped after reaching the service life. Since 2015, new energy vehicles have gradually become popular, so around 2020 will usher in the first wave of battery retirement. According to the China Automotive Technology and Research Center (CATARC), the sales volume of power batteries in China reached 15.7GWh in 2015, of which lithium iron phosphate batteries accounted for 69%. If the waste lithium iron phosph...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37H01M10/54
CPCC01B25/375H01M10/54C01P2002/72Y02W30/84
Inventor 杨利明冯裕发罗旭彪邵鹏辉石慧喻恺王超强章小明谢绍忠彭爱平
Owner NANCHANG HANGKONG UNIVERSITY
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