Recoverying method for sulfate in high concentration acid-containg waste liquid of battery factory

A battery factory and recovery method technology, applied in separation methods, chemical instruments and methods, water pollutants, etc., can solve problems such as unusable sulfuric acid, low sulfuric acid recovery rate, and increased production costs

Inactive Publication Date: 2007-10-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to solve the problem that the sulfuric acid recovery rate in the battery production waste liquid is low and the existence of metal ions makes the sulfuric acid in the battery production waste liquid can not be used continuously and the production cost is increased, and provides a high-concentration acid-containing waste liquid of a battery factory Recovery method of medium sulfuric acid

Method used

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  • Recoverying method for sulfate in high concentration acid-containg waste liquid of battery factory
  • Recoverying method for sulfate in high concentration acid-containg waste liquid of battery factory

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specific Embodiment approach 1

[0021] Specific embodiment one: the steps of the method for reclaiming sulfuric acid in this embodiment are as follows: a, first carry out diffusion dialysis to the sulfuric acid waste liquid in the battery production, and recycle under the condition that the ratio of waste acid to tap water volume is 1:1~1:3 Most of the sulfuric acid; b. The primary raffinate treated in step a is subjected to bipolar membrane electrodialysis, and the electrodialysis is carried out at a voltage of 8 to 15V for 90 to 200 minutes to recover sulfuric acid. The concentration of sulfuric acid in the secondary raffinate after sulfuric acid recovery is 0.04 %~0.12%, the ferrous ion concentration is 14.40mg / L, and the lead ion concentration is 2.94mg / L, which can be discharged after neutralization; c, mix the sulfuric acid recovered through step a and step b with commercially available chemically pure Concentrated sulfuric acid is mixed and formulated into a 10% to 15% sulfuric acid solution, which mee...

specific Embodiment approach 2

[0023] Embodiment 2: In this embodiment, the diffusion dialysis in step a adopts a homogeneous anion exchange membrane. Others are the same as in the first embodiment.

[0024] The homogeneous anion exchange membrane used in this embodiment has a chemically cross-linked structure. Since the homogeneous anion exchange membrane has stronger repellency to metal cations than the heterogeneous anion exchange membrane, the exchange capacity for anions is also larger.

specific Embodiment approach 3

[0025] Embodiment 3: The homogeneous anion exchange membrane of this embodiment has a strong basic fixing group connected to the polymer skeleton. Others are the same as in the second embodiment.

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Abstract

A process for recovering the high-concentration sulfuric acid contained sewage generated by electric accumulator factory includes such steps as diffusion dialysis for recovering the most of sulfuric acid, electric dialysis by bipolar membrane to recover the rest of sulfuric acid, mixing the recovered sulfuric acid, and concentrating by distillation method.

Description

technical field [0001] The invention relates to a method for recovering sulfuric acid by using electrochemical technology, in particular to a method for recovering sulfuric acid in high-concentration acid-containing waste liquid of a storage battery factory by using a combination process of diffusion dialysis and bipolar membrane electrodialysis. Background technique [0002] In the production process of batteries, the utilization rate of sulfuric acid is very low, and a large amount of sulfuric acid is discharged along with the acid-containing waste liquid. If these waste liquids are directly discharged into the environment without treatment, it will not only acidify the water body and soil, cause harm to the ecological environment, but also waste a lot of resources, and in order to neutralize such a high concentration of sulfuric acid, a large amount of alkali needs to be consumed, which increases the Waste treatment costs. Therefore, directly discharging this high-concen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F1/469C02F101/10
Inventor 汪群慧程桂石马宁刘冠华
Owner HARBIN INST OF TECH
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