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A limestone-based lead plaster pre-desulfurization method

A pre-desulfurization and limestone technology, applied in calcium/strontium/barium sulfate, recycling technology, recycling by waste collectors, etc., can solve the problem of high cost of lead plaster pre-desulfurization process, few applications, and recycling of sodium sulfate products Problems such as low price, to achieve the effect of good application prospect and good economic value

Active Publication Date: 2017-12-26
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the rapid economic growth of my country in the past ten years, the sodium sulfate industry has developed rapidly, and the sodium sulfate industry has reached a state of oversupply, resulting in a low recovery price for sodium sulfate products, which makes lead paste The cost of the pre-desulfurization process remains high, although it is environmentally friendly, it is not widely used

Method used

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  • A limestone-based lead plaster pre-desulfurization method

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Effect test

Embodiment 1

[0025] Waste lead-acid batteries are crushed and screened to obtain lead paste, and water is added to make a lead paste slurry with a mass percentage of 40%, which is pumped into a desulfurization mixing tank, and then NaHCO is added 3 As a desulfurizer (according to NaHCO 3 with PbSO 4 The molar ratio is 2.1:1 to add), the reaction temperature is controlled by steam heating to 50°C, and the desulfurization reaction is carried out. The gas generated by the desulfurization reaction is extracted and passed into the limestone slurry storage tank. After the desulfurization reaction for 60 minutes, the lead paste slurry is filtered, and the filtrate is mixed with the supernatant in the limestone slurry; the filter residue is sent to the melting furnace, and the gas generated in the melting furnace is continuously passed into the limestone slurry storage tank. After desulfurization, the sulfur content of the lead paste is 0.42%.

Embodiment 2

[0027] Waste lead-acid batteries are crushed and screened to obtain lead paste, and water is added to make a lead paste slurry with a mass percentage of 40%, which is pumped into a desulfurization mixing tank, and then NaHCO is added 3 As a desulfurizer (according to NaHCO 3 with PbSO 4 The molar ratio is 2.1:1 to add), the reaction temperature is controlled by steam heating to 60°C, and the desulfurization reaction is carried out. The gas generated by the desulfurization reaction is extracted and passed into the limestone slurry storage tank. After the desulfurization reaction for 60 minutes, the lead paste slurry is filtered, and the filtrate is mixed with the supernatant in the limestone slurry; the filter residue is sent to the melting furnace, and the gas generated in the melting furnace is continuously passed into the limestone slurry storage tank. After desulfurization, the sulfur content of the lead paste is 0.38%.

Embodiment 3

[0029] Waste lead-acid batteries are crushed and screened to obtain lead paste, and water is added to make a lead paste slurry with a mass percentage of 70%, which is pumped into a desulfurization mixing tank, and then NaHCO is added 3 As a desulfurizer (according to NaHCO 3 with PbSO 4 The molar ratio is 2.05:1 to add), the reaction temperature is controlled by steam heating to 50°C, and the desulfurization reaction is carried out. The gas generated by the desulfurization reaction is extracted and passed into the limestone slurry storage tank. After the desulfurization reaction for 60 minutes, the lead paste slurry is filtered, and the filtrate is mixed with the supernatant in the limestone slurry; the filter residue is sent to the melting furnace, and the gas generated in the melting furnace is continuously passed into the limestone slurry storage tank. After desulfurization, the sulfur content of the lead paste is 0.35%.

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Abstract

The invention discloses a limestone-based lead plaster pre-desulfurization method. First, the lead plaster obtained by crushing and sorting waste lead-acid batteries undergoes a desulfurization reaction under the action of desulfurization agent NaHCO3, and then converts Na2SO4, CO2 and H2O generated by the desulfurization reaction into desulfurization agent NaHCO3 required for pre-desulfurization through limestone (CaCO3) , to realize the recycling of the desulfurizer, and the gypsum produced at the same time has good economic value and can be directly exported for utilization. The method of the invention realizes the cyclic regeneration of the lead paste pre-desulfurization sodium-based desulfurizer, and solves the problem that the low value of the product sodium sulfate in the lead paste desulfurization process restricts the popularization and application of the waste lead-acid storage battery regeneration industry.

Description

technical field [0001] The invention belongs to the field of resource regeneration of waste lead-acid batteries and is used for desulfurization of lead paste in the regeneration process of waste lead-acid batteries. Background technique [0002] Due to its stable performance, high safety, and low manufacturing cost, lead-acid batteries have become a "resource recycling" energy product with a wide range of applications. Lead-acid battery is the secondary battery with the longest history of development and the first rechargeable battery for commercial application in the world. Since its invention by French physicist Gaston Plante in 1859, it has experienced more than 150 years of development. development path. In the past ten years, with the development of the world's energy economy and the improvement of people's living standards, the application fields of lead-acid batteries have been continuously expanded, and the market demand has also increased significantly. Among the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C01F11/46
CPCY02W30/84
Inventor 张俊丰易亮曹靖黄妍
Owner XIANGTAN UNIV
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