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Waste gas treatment method

A waste gas treatment and waste gas technology, which is applied in the field of lithium-ion battery recycling and treatment, can solve the problems of difficult collection of fine particle dust, low efficiency of fluorine purification and treatment, and difficulty in treatment.

Inactive Publication Date: 2020-10-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, it is necessary for the present invention to provide a waste gas treatment method, which can carry out targeted and segmented treatment of waste gas of different types, contents and concentrations produced in different recycling processes, so as to realize the recovery process of waste lithium-ion power batteries. The waste gas treatment is targeted, greatly reduces secondary pollution, reduces environmental protection operation costs, and achieves harmless and up-to-standard emissions. Particle dust is difficult to collect and other problems

Method used

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Examples

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Effect test

Embodiment 1

[0045] (1) Take a square-shaped waste lithium-ion power battery with a model of 20100140 as an example, and the disassembly and removal process is carried out in a sealed negative pressure state.

[0046] The waste gas generated during the dismantling and dehulling process is sprayed with two-stage lye. The specific steps are: the first stage lye spray is added with 15% sodium hydroxide by mass and 5% calcium hydroxide by mass. Mix the prepared alkali solution, some of the fluorine-containing compounds in the exhaust gas react with the lye to generate sodium fluoride and calcium fluoride into the solution; the second-stage lye spray is added with a mass fraction of 10% sodium hydroxide + mass In an alkaline solution prepared by mixing 10% sodium carbonate, the remaining fluorine-containing compounds in the exhaust gas react with the alkaline solution to generate sodium fluoride into the solution, and the generated carbon dioxide can dilute the concentration of non-methane total hy...

Embodiment 2

[0054] (1) Take a cylindrical waste lithium-ion power battery with model 32131 as an example, and the disassembly and removal process is carried out in a sealed negative pressure state.

[0055] The waste gas generated in the process of dismantling and shelling is sprayed through two-stage lye. The specific steps are: the first stage lye spray uses 10% sodium hydroxide by mass and 10% calcium hydroxide by mass. Mix the prepared alkali solution, some of the fluorine-containing compounds in the exhaust gas react with the lye to generate sodium fluoride and calcium fluoride into the solution; the second-stage lye spray is added with 5% by mass sodium hydroxide + mass In an alkaline solution prepared by mixing 15% sodium carbonate, the remaining fluorine-containing compounds in the exhaust gas react with the alkaline solution to generate sodium fluoride into the solution, and the generated carbon dioxide dilutes the non-methane total hydrocarbon content in the exhaust gas.

[0056] The...

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Abstract

The invention discloses a waste gas treatment method. Waste gas is generated in the recovery process of a waste lithium ion power battery; the recycling process of the waste lithium ion power batterysequentially comprises the steps of disassembling and shelling, evaporating and drying, and crushing and sorting. The waste gas treatment method comprises the following steps that: the waste gas generated in the disassembling and shelling process is sequentially subjected to two-stage alkali liquor spraying, refined filtration and dehumidification, UV photolysis and activated carbon adsorption treatment; the waste gas generated in the evaporation drying process is sequentially treated in a lime adsorption mode and a TO or RTO combustion mode; and dust generated in the crushing and sorting process is sequentially removed in a cloth bag dust removal mode and an electrostatic dust removal mode. According to the waste gas treatment method, segmented treatment is carried out in a targeted mode,so that targeted waste gas treatment in the recycling process of the waste lithium ion power battery is achieved, secondary pollution is greatly reduced, the environment-friendly operation cost is reduced, and harmless emission is achieved.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery recovery and treatment, and in particular relates to a waste gas treatment method in the recovery process of waste lithium ion power batteries. Background technique [0002] Lithium-ion power batteries are widely used in mainstream new energy vehicle battery systems due to their long life, high safety, and no memory effect. The average service life (small passenger cars 4-8 years, large commercial vehicles 3- 5 years), the peak of retirement of lithium-ion power batteries has gradually come. [0003] Lithium-ion batteries contain toxic and harmful electrolytes (mixed solvents composed of lithium hexafluorophosphate, ethylene carbonate, dimethyl carbonate, diethyl carbonate, etc.), and lithium hexafluorophosphate reacts when exposed to air or heated to generate hydrogen fluoride, phosphorus pentafluoride, etc. Fluorine-containing substances have great environmental pollution. In addition, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/79B01D53/68B01D53/44B01D53/14B01D53/02B01D50/00B01D46/00F23G7/06F23G7/07
CPCB01D53/75B01D53/007B01D53/1406B01D53/1487B01D53/79B01D53/44B01D53/68B01D53/02B01D46/00B01D50/00F23G7/06F23G7/07B01D2259/804B01D2253/102B01D2253/1124B01D2253/112
Inventor 徐懋胡在京钟利民
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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