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Method for desulfurizing waste lead-acid battery diachylon

A technology for waste lead-acid batteries and lead paste, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of low value of by-products, poor desulfurization effect, and high price of desulfurizers

Active Publication Date: 2014-09-03
HUBEI CHUKAI METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In short, the main problems in the prior art of the desulfurization conversion process of waste lead-acid battery lead paste include: 1. The price of desulfurizer is high, and the desulfurization effect is poor; 2. The value of by-products after desulfurization is low; 3. Desulfurization is not complete; 4. Sulfur dioxide emissions are still there, while there are massive CO2 emissions issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for desulfurizing lead paste of waste lead-acid batteries. Its specific steps are:

[0031] Step 1. First crush the waste lead-acid battery, put the lead paste obtained after crushing into the reaction tank, and feed 1~5wt% ammonia water. The molar amount of ammonia in the ammonia water is equal to the molar amount of lead sulfate in the lead paste 1 to 3 times of that; then continuously stir at room temperature, and then perform solid-liquid separation to obtain desulfurized lead paste and filtrate.

[0032] The continuous stirring refers to continuous stirring in three stages, the first stage is stirred for 0.5-0.7 hours, the third stage is stirred for 0.5-1 hour, and the second stage is stirred for 0.5-1 hour under the condition of feeding carbon dioxide gas.

[0033] Step 2, first put the filtrate obtained in step 1 into an evaporation crystallization tank, adopt a single-effect vacuum evaporation concentration crystallization process to obtain ammonium su...

Embodiment 2

[0037] A method for desulfurizing lead paste of waste lead-acid batteries. Its specific steps are:

[0038] Step 1. First crush the waste lead-acid battery, put the lead paste obtained after the crushing into the reaction tank, and feed 5~10wt% ammonia water. The molar amount of ammonia in the ammonia water is equal to the mole of lead sulfate in the lead paste 2 to 5 times the amount; then continuously stirred at room temperature, and then separated from solid and liquid to obtain desulfurized lead paste and filtrate.

[0039] The continuous stirring refers to continuous stirring in three stages, the first stage is stirred for 0.6-0.8 hours, the third stage is stirred for 1-3 hours, and the second stage is stirred for 1-2 hours under the condition of feeding carbon dioxide gas.

[0040] Step 2 is the same as Step 2 in Example 1.

[0041] Step 3: Calcinate and reduce the desulfurized lead paste obtained in step 1 at 315-400°C for 3-5 hours, then recycle the carbon dioxide ga...

Embodiment 3

[0044] A method for desulfurizing lead paste of waste lead-acid batteries. Its specific steps are:

[0045] Step 1. First crush the waste lead-acid battery, put the lead paste obtained after crushing into the reaction tank, and feed 10~18wt% ammonia water, and the molar amount of ammonia in the ammonia water is equal to the molar amount of lead sulfate in the lead paste 5 to 8 times of that; then continuously stir at room temperature, and then perform solid-liquid separation to obtain desulfurized lead paste and filtrate.

[0046] The continuous stirring refers to continuous stirring in three stages, the first stage is stirred for 0.7-0.9 hours, the third stage is stirred for 3-6 hours, and the second stage is stirred for 2-3 hours under the condition of feeding carbon dioxide gas.

[0047] Step 2 is the same as Step 2 in Example 1.

[0048] Step 3: Calcinate and reduce the desulfurized lead paste obtained in step 1 at 315-400°C for 5-7 hours, then recycle the carbon dioxide...

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Abstract

The invention relates to a method for desulfurizing lead paste of waste lead-acid batteries. Its technical scheme is: first add the lead paste in the broken waste lead-acid battery into the reaction tank, feed 1-25wt% ammonia water or 1-25wt% ammonia-containing substance solution, and the ammonia water The molar amount of the ammonia or the molar amount of the amino group in the amino-containing material solution is 1 to 10 times the molar amount of the lead sulfate in the lead paste; continuous stirring at room temperature, solid-liquid separation, and desulfurization lead paste and filtrate are obtained. Then put the filtrate into the evaporation crystallization tank, and adopt the single-effect vacuum evaporation concentration crystallization process to obtain ammonium sulfate by-product, then cool the evaporated liquid in the crystallization process to room temperature, and then pass it into the reaction tank for recycling. Finally, the desulfurized lead paste is calcined and reduced at 315-400° C. for 1-10 hours, and the carbon dioxide gas recovered during the calcined reduction process is passed into a reaction tank for recycling. The invention has the characteristics of simple process, high desulfurization rate, environmental friendliness and low cost.

Description

technical field [0001] The invention belongs to the technical field of recycling lead paste of waste lead-acid batteries, and in particular relates to a desulfurization method for lead paste of waste lead-acid batteries. Background technique [0002] Lead is one of the metals commonly used by humans, and its output is second only to aluminum, copper and zinc in non-ferrous metals, ranking fourth. At present, lead is mainly used in lead-acid batteries. According to incomplete statistics, about 80-85% of the lead consumed in the world is used in lead-acid batteries. With the rapid development of modern communication and transportation industries, human demand for lead-acid batteries will continue to grow. However, according to the current reserve-production ratio of lead ore resources, in 2003, the world's lead reserves and the static guarantee period of the reserve base were 21 years and 43 years respectively, and lead resources are increasingly exhausted; while the servic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B13/00H01M10/54
CPCY02W30/84
Inventor 杨正群柯昌美汪振忠李怀程王茜张利玉陈珊
Owner HUBEI CHUKAI METALLURGY
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