Recycling technique of lithium iron phosphate production wastewater

A technology for the production of wastewater and lithium iron phosphate, which is applied in water/sewage treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the difficult treatment of lithium iron phosphate production wastewater and the immeasurable market prospects, etc. problems, to achieve good application prospects, stable treatment effect, and simple process

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

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Problems solved by technology

[0006] The process of the present invention solves the problem of difficult treatment of the existing wastewater produced by lithium iron phosphate, and further realizes the resource recovery and utilization of phosphate and sulfate ions in the deammonization wastewater o

Method used

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  • Recycling technique of lithium iron phosphate production wastewater

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Effect test

Embodiment 1

[0028] The lithium iron phosphate production wastewater discharged from a lithium battery production plant enters the stirred reactor after pretreatment, and adds cheap magnesite powder while stirring, controls the pH of the mixed solution at 7, and then pumps the mixed solution into the closed reaction Add sodium hydroxide solution into the reactor, adjust the pH of the reaction solution to 8, pump the mixed slurry into a closed plate and frame filter for filtration, and obtain solid slag struvite and sulfate filtrate containing high concentration of ammonia nitrogen.

[0029] The filtrate is pumped into another closed reactor to measure the liquid phase phosphorus concentration in the reaction solution. If the phosphorus concentration is higher than 0.1 mg / L, magnesium hydroxide is further added to continue the stirring reaction for 2 hours, and the phosphate ion is precipitated completely. The reaction mixture is then filtered through a closed plate and frame filter for the ...

Embodiment 2

[0032] The lithium iron phosphate production wastewater discharged from a lithium battery production plant enters the stirred reactor after pretreatment, and adds cheap magnesite powder while stirring, controls the pH of the mixed solution at 7.5, and then pumps the mixed solution into the closed reaction Add sodium hydroxide solution into the reactor, adjust the pH of the reaction solution to 8.5, pump the mixed slurry into a closed plate and frame filter for filtration, and obtain solid slag struvite and sulfate filtrate containing high concentration of ammonia nitrogen.

[0033] The filtrate is pumped into another closed reactor to measure the liquid phase phosphorus concentration in the reaction solution. If the phosphorus concentration is higher than 0.1 mg / L, magnesium hydroxide is further added to continue the stirring reaction for 2 hours, and the phosphate ion is precipitated completely. The reaction mixture is then filtered through a closed plate and frame filter for ...

Embodiment 3

[0036] The lithium iron phosphate production wastewater discharged from a lithium battery production plant enters the stirring reactor after pretreatment, and adds cheap magnesite powder while stirring, controls the pH of the mixed solution at 8, and then pumps the mixed solution into the closed reaction Add sodium hydroxide solution into the reactor, adjust the pH of the reaction solution to 9, pump the mixed slurry into a closed plate and frame filter for filtration, and obtain solid slag struvite and sulfate filtrate containing high concentration of ammonia nitrogen.

[0037]The filtrate is pumped into another closed reactor to measure the liquid phase phosphorus concentration in the reaction solution. If the phosphorus concentration is higher than 0.1 mg / L, magnesium hydroxide is further added to continue the stirring reaction for 2 hours, and the phosphate ion is precipitated completely. The reaction mixture is then filtered through a closed plate and frame filter for the ...

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Abstract

The invention relates to a recycling technique of lithium iron phosphate production wastewater, belonging to the field of advanced wastewater treatment. The technique comprises the following steps: regulating the pH value of wastewater to neutrality by using cheap magnesite, adding a magnesium hydroxide emulsion to regulate the pH value to 8-9 to obtain guano recycled ammonia nitrogen and phosphorus, and completely precipitating phosphoric acid; adding sodium alkali into the residual high-concentration ammonia nitrogen, evaporating ammonia to recycle ammonia water, removing magnesium from the residual high-concentration sodium sulfate, and crystallizing by evaporation to obtain the sodium sulfate product, thereby implementing zero discharge of wastewater. The magnesite is utilized to treat the high-concentration phosphorus salt and ammonium salt to recycle the guano, and the ammonia evaporation and evaporative crystallization are combined to recycle the components in the wastewater, thereby implementing zero discharge of wastewater. Compared with the existing method, the technique is lower in cost and can implement all-component recycling.

Description

technical field [0001] The invention relates to the field of advanced treatment of industrial wastewater, in particular to a resource treatment process for lithium iron phosphate production wastewater. Background technique [0002] Lithium iron phosphate, the cathode material of lithium-ion batteries, has strong investment value in the energy storage market and electric vehicle market due to its good compatibility, high energy density, long cycle life, high temperature performance and safety performance. [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 process route, ferrous oxalate process route, iron oxide process route and ferric phosphate p...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01C1/02C01D5/00C05G1/00
CPCC01C1/022C01D5/00C02F1/048C02F1/42C02F9/00C02F2001/425C05G1/00
Inventor 刘亚丽李玉平刘晨明林晓
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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