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A combined treatment method for waste battery discharge and sulfur-containing wastewater desulfurization

A waste battery, combined treatment technology, applied in gaseous discharge wastewater treatment, multi-stage water treatment, water/sewage treatment, etc. The discharge time is shortened and the effect of cascade utilization is realized

Active Publication Date: 2020-07-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve technical problems such as long discharge time, unsatisfactory discharge effect and sulfur pollution in industrial waste water existing in the discharge method of lithium-ion battery recovery, the present invention innovatively proposes a brand-new combined treatment idea to achieve full Under the premise of discharge, it also removes low-priced sulfur in industrial wastewater

Method used

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  • A combined treatment method for waste battery discharge and sulfur-containing wastewater desulfurization

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Experimental program
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Effect test

Embodiment 1

[0048] Such as figure 1 Shown, the present invention is a kind of method for the hydrogen sulfide in waste water that the residual energy cascade utilization in a kind of battery, industrial waste water (in the waste water, the existence form of sulfur is S 2- and HS - , the total mass fraction of sulfur is at 9.6wt.%) through the primary filter to remove the suspended matter with a particle size greater than 0.5mm in advance; then carry out secondary filtration, add an adsorbent during the secondary filter and centrifugally filter to remove the suspended matter with a particle size less than 0.5mm A secondary filtrate was obtained. The pH value of the secondary filtrate is about 7.3 (7.3 ± 0.1), and the secondary filtrate is sent to the reaction device equipped with waste lithium batteries (soaking the waste lithium batteries in the secondary filtrate) for discharge treatment. The generated gas is collected to obtain high-purity hydrogen, and after sufficient time to react,...

Embodiment 2

[0054] Take 10L of industrial waste water, and after primary filtration and secondary adsorption filtration, the sulfur content of the secondary filtrate without suspended solids is determined to be 9.6wt.%. Then pour the secondary filtrate into a closed device with waste batteries. The initial voltage of the waste batteries is 3.8-3.85V. Add sulfuric acid to adjust the pH value of the filtrate to about 1. At this time, the sulfur in the solution is 2 S, HS- exists in the form. After 24 hours of discharge, the sulfur content was determined to be 0.73wt.%, the average residual voltage of the waste battery was around 0.5V, and the gas composition in the gas collection device was analyzed to find that the hydrogen gas fraction was 73%, and the hydrogen sulfide volume fraction was 25%. It can be seen that hydrogen sulfide gas is released in acidic environment.

Embodiment 3

[0056] Take 10L of industrial waste water, and after primary filtration and secondary adsorption filtration, the sulfur content of the secondary filtrate without suspended solids is determined to be 9.6wt.%. Then pour the secondary filtrate into a closed device containing waste batteries, the initial voltage of which is 3.8-3.85V. Add sodium hydroxide to adjust the pH value of the filtrate to about 10 (10 ± 0.1). 2- form exists. After 24 hours of discharge, the sulfur content was determined to be 0.13wt.%, the average residual voltage of the waste battery was around 0V, the gas composition in the gas collection device was analyzed and the hydrogen gas fraction was 98%, and no hydrogen sulfide gas was detected. It can be seen that no hydrogen sulfide gas is released under alkaline environment.

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Abstract

The invention relates to the field of waste water and waste battery combined treatment, and particularly discloses a combined treatment method of electric discharge of a waste battery and desulfuration of waste water containing sulfur. The combined treatment includes the following steps that a battery group of a waste lithium ion battery or a battery monomer obtained by disassembling is placed inthe waste water containing the sulfur for electric discharge; the battery group or battery monomer after the electric discharge is conducted is separated, and water after desulfurization treatment isconducted is discharged; and the waste water containing the sulfur contains at least one H2S, HS- and S2-. According to the combined treatment method, full use of surplus energy in a waste lithium battery is achieved, cleaning is efficient, the disadvantages of the traditional treatment method of hydrogen sulfide in industrial waste water are overcome, and the combined treatment method is simple,practical, economic and feasible, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of waste lithium ion battery recycling, and in particular relates to a method for treating hydrogen sulfide in waste water by cascade utilization of residual energy in waste lithium batteries. Background technique [0002] With the rapid development of modern science and technology, the problem of social energy and environmental ecological pollution has become increasingly prominent, and the environmental and ecological pollution of various waste batteries has become the focus of social attention. Nickel-cobalt manganese oxide lithium-ion batteries are widely used in power batteries and energy storage batteries due to their high capacity, stable cycle performance, and high working platform voltage. Power and energy storage batteries usually require more battery materials than conventional small batteries. Therefore, in the next 3-5 years, a large number of used lithium-ion batteries will be scrapped, and their recycli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06H01M10/54C02F101/10C02F103/18
CPCC02F1/001C02F1/28C02F1/4608C02F1/4672C02F1/4676C02F9/00C02F2101/101C02F2103/18C02F2301/08H01M10/54Y02W30/84
Inventor 蒋良兴杨健刘芳洋赖延清李劼杨凡
Owner CENT SOUTH UNIV
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