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Resourceful treatment method and system of lithium battery cathode material production wastewater

A cathode material, a technology for producing wastewater, which is applied in the fields of natural water treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. The process system is simple and the effect of recycling is realized

Active Publication Date: 2015-05-20
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the commonly used ferrous oxalate process route, iron oxide process route and iron phosphate process route all use phosphate and ammonium salts represented by phosphoric acid and ammonium dihydrogen phosphate. At the same time, the lithium iron phosphate precursor is waiting for washing And the separation process will produce a large amount of acidic wastewater (pH<2), the ammonia nitrogen content of the wastewater is as high as tens of grams per liter, and because the solution is highly acidic, if it is simply treated by adding alkali and distilling ammonia, it will consume a lot of alkali, making The cost of wastewater treatment is too high; and because it contains a large amount of phosphate ions, direct discharge after ammonia removal still cannot meet the standard, and it will cause waste of phosphorus resources

Method used

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  • Resourceful treatment method and system of lithium battery cathode material production wastewater

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Embodiment 1

[0033] A kind of waste water from the production of positive electrode materials of lithium batteries enters the reaction precipitation unit after pretreatment, reacts with lime milk, adds lime milk while stirring, and controls the pH of the reaction liquid to be 10, and then pumps the mixed slurry into the separation unit, and the solid slag is discharged Transport, the first-stage filtrate enters the high-efficiency settling unit for further precipitation and separation, the solid slag is transported outside, and the second-stage filtrate enters the heat exchanger after passing through the scale inhibitor and exchanges heat with the water at the bottom of the stripping tower of the deamination unit. After increasing the temperature Enter the closed reactor, react with sodium hydroxide solution, stir and mix thoroughly, then enter the stripping tower for stripping and distilling ammonia, the ammonia gas enters the condenser from the top of the tower, part of it is refluxed, and...

Embodiment 2

[0035] A kind of waste water from the production of cathode materials for lithium batteries enters the reaction precipitation unit after pretreatment, reacts with milk of lime, adds milk of lime while stirring, and controls the pH of the reaction solution to 6.5, then pumps the mixed slurry into the separation unit, and the solid slag is discharged Transport, the first-stage filtrate enters the high-efficiency settling unit for further precipitation and separation, the solid slag is transported outside, and the second-stage filtrate enters the heat exchanger after passing through the scale inhibitor and exchanges heat with the water at the bottom of the stripping tower of the deamination unit. After increasing the temperature Enter the closed reactor, react with sodium hydroxide solution, stir and mix thoroughly, then enter the stripping tower for stripping and distilling ammonia, the ammonia gas enters the condenser from the top of the tower, part of it is refluxed, and part of...

Embodiment 3

[0037] A kind of waste water from the production of positive electrode materials of lithium batteries enters the reaction precipitation unit after pretreatment, reacts with lime milk, adds lime milk while stirring, and controls the pH of the reaction solution to be 8, and then pumps the mixed slurry into the separation unit, and the solid slag is discharged Transport, the first-stage filtrate enters the high-efficiency settling unit for further precipitation and separation, the solid slag is transported outside, and the second-stage filtrate enters the heat exchanger after passing through the scale inhibitor and exchanges heat with the water at the bottom of the stripping tower of the deamination unit. After increasing the temperature Enter the closed reactor, react with sodium hydroxide solution, stir and mix thoroughly, then enter the stripping tower for stripping and distilling ammonia, the ammonia gas enters the condenser from the top of the tower, part of it is refluxed, an...

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Abstract

The invention discloses a resourceful treatment method and system of lithium battery cathode material production wastewater. According to the method, phosphate radicals are precipitated by virtue of mainly using lime milk and the addition of lime milk is controlled so that phosphate radicals are completely precipitated and meanwhile, the pH of the reaction liquid is kept to be alkaline, the reduction in the addition of lye required in the subsequent ammonia removal is achieved, the low-cost dephosphorization and ammonia recovery are truly realized, the obtained calcium phosphate and high-purity concentrated ammonia water can be recycled, the process is stable and is basically free of fouling.

Description

technical field [0001] The invention belongs to the field of advanced treatment of wastewater, and in particular relates to a resource treatment method and system for wastewater produced by positive electrode materials of lithium batteries. Background technique [0002] In the field of lithium battery manufacturing, lithium iron phosphate materials are favored because of their wide source of raw materials, low price, good thermal stability, high specific energy, good cycle performance, outstanding safety performance and no pollution to the environment. One of the potential cathode materials. [0003] However, a prominent problem faced in the development of lithium iron phosphate materials is that the production process routes are too many and complicated, which also reflects that the production process of this material is not fully mature in China as a whole. At present, the mainstream production process routes on the market specifically include four types: hydrothermal pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/34
Inventor 刘晨明林晓盛宇星刘亚丽
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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