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A treatment method for high-salt wastewater in waste lithium battery recycling industry

A technology for waste lithium batteries and high-salt wastewater, which is applied in the fields of energy wastewater treatment, water/sewage treatment, heating water/sewage treatment, etc., can solve the problems of high processing cost, difficult recycling, waste of resources, etc., and achieves simple and efficient treatment methods. Economic recovery rate and energy saving effect

Active Publication Date: 2011-12-21
HUNAN BRUNP RECYCLING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, various waste lithium battery recycling companies pay more attention to and research the recovery and treatment of valuable metals nickel, cobalt, and lithium in wastewater, but for the large amount of salt in wastewater, due to the difficulty of recycling and high processing costs, companies often give up recycling and adopt direct methods. emissions, which not only pollute the environment, but also cause a great waste of resources
[0003] At present, there is no cost-effective treatment method for the high-salt wastewater generated in the waste lithium battery recycling industry

Method used

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  • A treatment method for high-salt wastewater in waste lithium battery recycling industry
  • A treatment method for high-salt wastewater in waste lithium battery recycling industry

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Implementation conditions: summer, high ambient temperature, sufficient solar energy

[0019] Take 100m of high-salt wastewater from the workshop 3 , Na 2 SO 4 The concentration is 94.16g / L, and the pH is 8.1. The above wastewater is treated by reverse osmosis process, which adopts one-stage three-stage reverse osmosis process, and uses low pollution and high desalination composite reverse osmosis membrane to obtain purified water of 51m 3 , Concentrated water 49m 3 ; The purified water is returned to the workshop for reuse, and the Na in the concentrated water 2 SO 4 Concentration is 187.58g / l; Put above-mentioned concentrated water into salting-out pond, utilize solar energy to evaporate naturally to salt analysis, carry out solid-liquid separation to obtain 15.8 tons of Glauber's salt (Na 2 SO 4 10H 2 O) and 5.6m 3 Mother liquor, Na in mother liquor 2 SO 4 The concentration is 397.03g / L, return to concentrated water treatment.

[0020] In this embodiment,...

Embodiment 2

[0022] Implementation conditions: winter, low ambient temperature

[0023] Take 100m of high-salt wastewater from the workshop 3 , Na 2 SO 4 The concentration is 80.16g / L, and the pH is 8.8. The above wastewater was treated by reverse osmosis process to obtain purified water of 51.7m 3 , concentrated water 48.3m 3 ; The purified water is returned to the workshop for reuse, and the Na in the concentrated water 2 SO 4 The concentration is 158.43g / l; the above-mentioned concentrated water is first heated to 70°C by a heat exchanger and then put into the salting out tank, and the air in the tank is turned on to stir, and the salt is analyzed after cooling, and then solid-liquid separation is carried out to obtain 14.15 tons of Glauber's salt and 26m 3 Mother liquor, where Na 2 SO 4 The concentration is 54.08g / l. After heating the mother liquor to 20°C, return to the reverse osmosis process to obtain purified water of 14m 3 12m with concentrated water 3 , Na in concentrat...

Embodiment 3

[0026] Implementation conditions: spring and autumn, rainy season

[0027] Take 100m of high-salt wastewater from the workshop 3 , Na 2 SO 4 The concentration is 95.16g / L, and the pH is 9.3. The above waste water is treated by reverse osmosis process to obtain 50m of purified water 3 50m with concentrated water 3 ; The purified water is returned to the workshop for reuse, and the Na in the concentrated water 2 SO 4 The concentration is 186.58g / l; the above-mentioned concentrated water is treated by multi-stage flash evaporation process, concentrated and evaporated, the slurry is put into the salting out tank, and solid-liquid separation is carried out after cooling to obtain 17.2 tons of Glauber's salt, 9m 3 Mother liquor, where Na 2 SO 4 The concentration was 193.76 g / l. The mother liquor is mixed with concentrated water and returned to the multi-stage flash evaporation process.

[0028] In this embodiment, the waste water recovery rate is 50%, the desalination rate...

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Abstract

The invention discloses a treatment method of high-salinity waste water in a waste lithium battery recovering industry. According to the treatment method, purified water and concentrated water are obtained with a reverse osmosis process, wherein the purified water can be recycled, and the salt in the concentrated water is recovered. By utilizing the treatment method in the invention, the cyclic utilization of the high-salinity waste water in the waste lithium battery recovering industry can be realized, thereby the zero emission of the waste water is truly realized; and simultaneously, the salt in the waste water is recovered by fully utilizing natural energies such as solar energy, wind energy and the like, thereby energy consumption is obviously reduced and cost is saved, and the recovered salt has a larger economic benefit.

Description

technical field [0001] The invention relates to a method for treating waste water, in particular to a method for treating high-salt waste water produced in the waste lithium battery recycling industry. Background technique [0002] With the rapid development of the waste lithium battery recycling industry, wastewater treatment in this industry has generally received attention. At present, various waste lithium battery recycling companies pay more attention to and research the recovery and treatment of valuable metals nickel, cobalt, and lithium in wastewater. However, for the large amount of salt in wastewater, due to the difficulty of recycling and high processing costs, companies often give up recycling and adopt direct methods. This not only pollutes the environment, but also causes a great waste of resources. [0003] At present, there is no cost-effective treatment method for the high-salt wastewater generated in the waste lithium battery recycling industry. How to ec...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/44C02F1/14C02F1/06C02F1/22
CPCY02A20/141Y02A20/212Y02W10/33Y02W10/37
Inventor 王皓龙桂花谭群英李达飞曾昭华刘长根
Owner HUNAN BRUNP RECYCLING TECH
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