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Method for regenerating iron phosphate from phosphorus iron slag after lithium extraction

A technology of iron phosphate and ferrophosphorus slag is applied in the field of waste resource recycling and lithium ion battery materials, which can solve the problems of alkali consumption and acid consumption, achieve high recovery rate, reduce acid and alkali consumption, and low-value by-products less effect

Pending Publication Date: 2022-04-26
四川长虹格润环保科技股份有限公司
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Problems solved by technology

According to thermodynamic calculations and experiments, we can conclude that the leaching pH value of ferric orthophosphate is lower than -2, while the leaching pH value of ferrous phosphate is only about 1 to 2, so this technology will use a particularly large amount of acid, and then A large amount of alkali will also be consumed during iron phosphate precipitation, and a large amount of high-salt wastewater will also be produced

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  • Method for regenerating iron phosphate from phosphorus iron slag after lithium extraction
  • Method for regenerating iron phosphate from phosphorus iron slag after lithium extraction

Examples

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Embodiment 1

[0032] A method for regenerating iron phosphate slag from lithium after lithium extraction, the method may further comprise the steps:

[0033] Mix the ferrophosphorus slag after lithium extraction with pure water to make slurry according to the solid-to-liquid ratio of 1:5, add sodium hydroxide solution twice the theoretical amount to the slurry, react for 1 hour, filter and wash the solid to obtain slag A.

[0034] After drying the slag A in a vacuum drying oven, add 2 times the theoretical amount of glucose to mix evenly, put it into a tube furnace and roast it for 2 hours to obtain the slag B.

[0035] Slag B and dilute phosphoric acid solution were slurried at a mass ratio of 1:6, stirred and leached at 80°C for 2 hours to obtain solution A, and the phosphorus-iron ratio was adjusted to 1.1:1 to obtain solution B.

[0036] At 60°C, add 6vol% hydrogen peroxide dropwise to solution B, use ammonia water to adjust the pH value of the solution to 2 for co-precipitation, and ob...

Embodiment 2

[0039] A method for regenerating iron phosphate slag from lithium after lithium extraction, the method may further comprise the steps:

[0040] The ferrophosphorus slag after lithium extraction was mixed with 2 times the theoretical amount of charcoal powder and roasted in a tube furnace for two hours to obtain slag A.

[0041] Slag A and water were slurried at a mass ratio of 1:3, sulfuric acid was added, and solution A was obtained by leaching at 25°C for 2 hours.

[0042] Add iron powder twice the amount of theory to solution A to replace and remove copper, and filter to obtain solution B.

[0043] Add ammonium dihydrogen phosphate to adjust the phosphorus-iron ratio to 1:1, then add hydrogen peroxide and ammonia water for co-precipitation, and obtain ferric phosphate dihydrate and precipitated liquid after solid-liquid separation, in which ferric phosphate dihydrate is roasted in a muffle furnace at 600 °C Ferric phosphate was obtained in 4 hours, and the solution after p...

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Abstract

The invention discloses a method for regenerating iron phosphate from phosphorus iron slag after lithium extraction, which belongs to the technical field of waste resource recycling and lithium ion battery materials and mainly comprises the following steps: alkaline aluminum removal, reduction roasting and acid leaching, iron phosphate production by coprecipitation and acid-base regeneration by bipolar membrane electrodialysis. The method realizes regeneration of the ferrophosphorus slag into the iron phosphate product on the premise of reducing the use amount of acid and alkali and being green and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of waste resource recycling and lithium ion battery materials, and in particular relates to a method for regenerating ferric phosphate from phosphorus iron slag after lithium extraction. Background technique [0002] The development of new energy vehicles has become the national strategy of countries all over the world. The production and sales of new energy vehicles in my country account for more than 50% of the world. By the end of June 2021, the number of new energy vehicles in the country will reach 6.03 million. By 2025, the sales volume will exceed 8 million, and the installed capacity of power batteries will reach 406GWh. Due to its relatively low price and higher safety advantages, lithium iron phosphate batteries continue to increase their share in power batteries, reaching 62% in 2020. The limited service life of lithium-ion batteries will inevitably lead to a large number of decommissioning of po...

Claims

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Application Information

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IPC IPC(8): C01B25/37C01C1/02C01B25/18
CPCC01B25/375C01C1/026C01C1/022C01B25/185C01P2006/80
Inventor 戴富书刘志东袁茂强李霞屈仁刚
Owner 四川长虹格润环保科技股份有限公司
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