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Method for preparing lead chloride and calcium sulfate from lead plasters of waste lead accumulators by wet process

A waste lead storage battery, calcium sulfate technology, applied in the direction of lead halide, calcium/strontium/barium sulfate, etc., can solve the problems of waste of resources, inability to precipitate lead chloride, lead pollution, etc., to achieve effective recycling and improve recovery rate , avoid wasteful effects

Inactive Publication Date: 2010-11-17
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cold crystallization in this method cannot completely precipitate lead chloride, resulting in a low lead recovery rate.
In addition, the sulfate ions in the cold analysis filtrate are not effectively removed, so that the cold analysis filtrate cannot be recycled, not to mention wasting resources, and it is easy to cause lead pollution, etc.

Method used

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  • Method for preparing lead chloride and calcium sulfate from lead plasters of waste lead accumulators by wet process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the present embodiment carries out as follows:

[0027] 1. In the lead plaster with a particle size of 74 μm, add saturated sodium chloride solution according to the weight ratio of lead plaster to saturated sodium chloride solution at 1:13, and add the weight percentage concentration of 1:2.5 according to the weight ratio of lead plaster to it 37% hydrochloric acid was reacted at 75° C. for 170 minutes. After the reaction was completed, the filter cake and filtrate were filtered while hot, and the lead leaching rate was 99.2%.

[0028] 2. Lower the above-mentioned lead paste leaching filtrate to room temperature, and let it stand at room temperature for 3.5 hours, let the lead chloride in it crystallize and precipitate, and filter; the filter cake is washed and dried at 105°C for 1.5 hours to obtain the lead chloride product . The content of lead chloride in this product is 99.6%, which has reached the requirement of the quality standard.

[0029] 3. Ad...

Embodiment 2

[0030] Embodiment 2: the present embodiment carries out as follows:

[0031] 1. In the lead plaster with a particle size of 74 μm, add saturated sodium chloride solution according to the weight ratio of lead plaster to saturated sodium chloride solution as 1:14, and add the weight percentage concentration of 1:2.2 according to the weight ratio of lead paste to it. 37% hydrochloric acid was reacted at 95° C. for 150 minutes. After the reaction was completed, the filter cake and filtrate were filtered while hot, and the lead leaching rate was 99.5%.

[0032] 2. Lower the filtrate from the above-mentioned lead paste to room temperature, and let it stand at room temperature for 4 hours to allow the lead chloride in it to crystallize and precipitate, and filter; the filter cake is washed and dried at 101°C for 2 hours to obtain the lead chloride product. The content of lead chloride in this product is 99.4%, which has reached the requirement of the quality standard.

[0033] 3. Ad...

Embodiment 3

[0034] Embodiment 3: the present embodiment carries out as follows:

[0035] 1. In the lead plaster with a particle size of 74 μm, add saturated sodium chloride solution according to the weight ratio of lead plaster to saturated sodium chloride solution at 1:15, and add the weight percent concentration of 37% hydrochloric acid was reacted at 85° C. for 160 minutes. After the reaction was completed, the filter cake and filtrate were filtered while hot, and the lead leaching rate was 99.7%.

[0036] 2. Lower the above-mentioned lead paste leaching filtrate to room temperature, and let it stand at room temperature for 4.5 hours, let the lead chloride in it crystallize and precipitate, and filter; the filter cake is washed and dried at 108°C for 1 hour to obtain the lead chloride product . The content of lead chloride in this product is 99.2%, which has reached the requirement of the quality standard.

[0037] 3. Add industrial calcium chloride to the above-mentioned cold analys...

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Abstract

The invention discloses a method for preparing lead chloride and calcium sulfate from lead plasters of waste lead accumulators by a wet process. The lead plasters of the waste lead accumulators are taken as a raw material, and the method comprises the following steps of: leaching the lead plasters in an HCl-NaCl system; cooling the leach solution to separate out crystals; and separating, washing and drying. The method is characterized in that: a sulfur resource is recovered from cooling crystallization filtrate, and the cooling crystallization filtrate is in a closed cycle; the cooling crystallization filtrate is added with calcium chloride to form a calcium sulfate precipitate; the calcium sulfate precipitate is separated, washed and dried to form a calcium sulfate product; and the filtrate is used for preparing saturated NaCl solution which returns to the leaching process. Through the method, the lead chloride is obtained, and the industrial gypsum with the purity of over 97 percent is also obtained, so the sulfur resource is recycled, the cooling crystallization filtrate is circularly used, the lead recovery rate is over 96 percent after four times of circulation, and the waste of the lead resource and the lead pollution are avoided.

Description

1. Technical field [0001] The present invention relates to the technical field of recovery and treatment of waste lead storage batteries, resource utilization and preparation of inorganic salts, in particular to a method for recycling and processing lead paste of waste lead storage batteries, especially to the preparation of lead chloride and Calcium sulfate method. 2. Background technology [0002] Lead is widely used, and its annual output ranks fourth in nonferrous metals after aluminum, copper and zinc. With the development of society, the human demand for lead is still increasing. Due to the increasing depletion of lead resources in nature, the recycling and resource utilization of lead-containing waste has received extensive attention. [0003] According to incomplete statistics, about 80% to 85% of the lead consumed in the world is used in lead-acid batteries, so waste lead-acid batteries are currently the most important raw materials for lead recovery. According t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/16C01F11/46
Inventor 于少明王玉黄宪法马成兵
Owner HEFEI UNIV OF TECH
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