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Neutralization treatment method of acid solution in lead-acid storage battery disassembling process

A technology of lead-acid batteries and lead-acid batteries, which can be used in the fields of neutralization water/sewage treatment, chemical instruments and methods, battery recycling, etc., and can solve the problem of high cost

Inactive Publication Date: 2021-01-26
ANHUI NARADA RENEWABLE RESOURCE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the above-mentioned technical problems, the object of the present invention is to provide a method for neutralizing the acid solution in the dismantling process of the lead-acid battery: the recycled waste lead-acid battery is processed by a fully automatic waste lead-acid battery crushing and sorting system Dismantling, sorting out lead sludge through mechanical crushing, and then using hydraulic separators and hydrodynamic separators to separate lead grids and plastics, and transporting the acid produced in the process of separating lead grids and plastics by hydraulic separation technology to dismantling In the sewage treatment system, calcium hydroxide is then added to the acid solution, and the calcium hydroxide and the acid solution are neutralized, which solves the problem of relatively high cost of the existing wastewater treatment technology

Method used

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  • Neutralization treatment method of acid solution in lead-acid storage battery disassembling process
  • Neutralization treatment method of acid solution in lead-acid storage battery disassembling process
  • Neutralization treatment method of acid solution in lead-acid storage battery disassembling process

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Experimental program
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Effect test

Embodiment 1

[0034] This embodiment is a method for neutralizing acid solution during dismantling of a lead-acid battery, comprising the following steps:

[0035] Step 1: Disassemble the recovered waste lead-acid batteries through the automatic waste lead-acid battery crushing and sorting system, sort out the lead sludge through mechanical crushing, and then use a hydraulic separator and a hydrodynamic separator to separate the lead grid and plastic ;

[0036] Step 2: Transport the acid produced in the process of separating the lead grid and plastic by hydraulic separation technology to the dismantling sewage treatment system, and then put calcium hydroxide into the acid, and the calcium hydroxide and the acid are neutralized.

[0037] The fully automatic waste lead-acid battery crushing and sorting system includes a vibrating feeder, a belt conveyor, a crusher, a vibrating screen, a lead mud sedimentation tank, a lead mud mixing tank, a filter press, a hydraulic separator, and a first-sta...

experiment example 1

[0047] Calcium hydroxide dosage test: Sampling the acid liquid produced in the automatic waste lead-acid battery crushing and sorting system, respectively sampling 300ml of acid liquid produced by the battery processing capacity of 1000 tons, 2000 tons, 3000 tons and 4000 tons, respectively In 4 beakers and marked as 1, 2, 3, 4 respectively, then add calcium hydroxide powder into the beakers and stir evenly until the pH value of each water sample is adjusted to 8.5±1, then the treated water The samples were left to stand for 6 hours, and the supernatants in 4 beakers were extracted with 100ml syringes for detection.

[0048] Result analysis:

[0049] see figure 2 As shown, it can be seen from the figure that with the increase of battery processing capacity, the acid content in the acid solution gradually increases, and the pH value gradually decreases. When the battery is processed to 3000 tons, the pH value of the acid solution is already less than 1. After neutralization...

experiment example 2

[0052] Acid content test: use the calibrated 0.1mol / l NaOH solution to calibrate the water samples in the 4 beakers, and convert the sulfuric acid content in the water samples.

[0053] Result analysis:

[0054] see Figure 4 As shown, it can be seen from the figure that with the increase of battery processing capacity, the sulfuric acid content in the acid solution gradually increases, and basically has a linear relationship with the battery processing capacity. When the processing capacity of the lead-acid battery reaches 4000 tons, The sulfuric acid content in the acid solution has reached about 8%.

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Abstract

The invention discloses a neutralization treatment method of an acid solution in the lead-acid storage battery disassembling process. According to the neutralization treatment method of the acid solution in the lead-acid storage battery disassembling process, waste lead-acid batteries are mechanically disassembled, then lead grids are separated from plastic by circulating water, and the acid content in the circulating water is increased along with increasing of the quantity of the disassembled waste lead-acid batteries; by means of the manner that calcium hydroxide is added for neutralizationreaction with the acid solution, the acid content in the circulating water is reduced, the replacement period of the circulating water is prolonged, the loss of water resources is reduced, and meanwhile, corrosion of the acid solution to equipment is avoided; furthermore, after the calcium hydroxide is added in the circulating water and OH<-> is introduced in the acid solution, H<+> in the acid solution is subjected to neutralization reaction with the OH<->, the acidity of the acid solution is improved, and when the pH value of the circulating water is larger than 7, the circulating water contains a large amount of the OH<-> which reacts with metal ions to form a coprecipitation effect, so that the contents of cadmium, iron, copper, zinc, nickel, aluminum and silicon ions in the circulating water are subjected to improved treatment.

Description

technical field [0001] The invention relates to the field of lead-acid batteries, in particular to a method for neutralizing acid solution during the dismantling process of lead-acid batteries. Background technique [0002] With the continuous progress of human society and the continuous development of social economy, the sales volume of automobiles and electric vehicles in my country has doubled year by year in recent years, and the annual consumption of lead-acid batteries has also increased, and lead-acid batteries themselves have a certain service life. In the case of repeated discharge and charge during the service cycle, the conductivity of the internal electrode plates of the battery will gradually weaken until the use value of the battery is lost. Therefore, the amount of scrapped lead-acid batteries every year is also quite huge. Because the battery contains a large amount of heavy metal lead and sulfuric acid in the electrolyte, direct disposal will inevitably caus...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00B29B17/02H01M10/54C02F1/66
CPCB09B3/00B09B5/00B29B17/02H01M10/54C02F1/66B09B2101/02Y02W30/62Y02W30/84
Inventor 王武钧应纪飞李成现
Owner ANHUI NARADA RENEWABLE RESOURCE TECH CO LTD
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