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Tin stripping waste liquid treating method

A treatment method and waste liquid technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as large consumption of ammonia water and waste of resources

Inactive Publication Date: 2015-10-21
QINGYUAN XINLV ENVIRONMENTAL TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, concentrated sulfuric acid is used as the electrolyte when metal tin is recycled, and the pH value of neutralization is high, the consumption of ammonia water is large, and metal copper and tin co-precipitate, resulting in waste of resources

Method used

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  • Tin stripping waste liquid treating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Refer to attached figure 1 , a treatment method for tin stripping waste liquid, comprising the steps of:

[0023] S1. Pretreatment of tin stripping waste liquid

[0024] Add ammonium sulfate solid to the tin stripping waste liquid, adjust the pH value to 1.0-1.5,

[0025] S2. Recovery of metal tin

[0026] The polyacrylamide flocculant is added to the tin stripping waste liquid with a pH value of 1.0-1.5. The amount of the polyacrylamide flocculant added is 0.1% of the pretreated tin stripping waste liquid, so that the metal tin is in the form of tin hydroxide Precipitate, through solid-liquid separation, get wet tin hydroxide and copper-containing waste water, wet tin hydroxide is burned in a rotary kiln, the average temperature is about 800 ℃, get tin hydroxide powder, wet tin hydroxide is burned in a rotary kiln The exhaust gas obtained from burning is discharged after being treated by the four-stage spraying system to meet the standard;

[0027] S3. Recovery of ...

Embodiment 2

[0031] Refer to attached figure 1 , a treatment method for tin stripping waste liquid, comprising the steps of:

[0032] S1. Pretreatment of tin stripping waste liquid

[0033] Add solid sodium sulfate to the tin stripping waste liquid to adjust the pH value to 1.0-1.5,

[0034] S2. Recovery of metal tin

[0035] The polyacrylamide flocculant is added to the tin stripping waste liquid with a pH value of 1.0-1.5. The amount of the polyacrylamide flocculant added is 0.08% of the pretreated tin stripping waste liquid, so that the metal tin is in the form of tin hydroxide Precipitate, through solid-liquid separation, get wet tin hydroxide and copper-containing waste water, wet tin hydroxide is burned in a rotary kiln, the average temperature is about 800 ℃, get tin hydroxide powder, wet tin hydroxide is burned in a rotary kiln The exhaust gas obtained from burning is discharged after being treated by the four-stage spraying system to meet the standard;

[0036] S3. Recovery of...

Embodiment 3

[0040] Refer to attached figure 1 , a treatment method for tin stripping waste liquid, comprising the steps of:

[0041] S1. Pretreatment of tin stripping waste liquid

[0042] Add ammonium sulfate solid to the tin stripping waste liquid, adjust the pH value to 1.0-1.5,

[0043] S2. Recovery of metal tin

[0044] A polyacrylamide flocculant is added to the tin stripping waste liquid with a pH value of 1.0-1.5. The amount of the polyacrylamide flocculant added is 0.15% of the pretreated tin stripping waste liquid, so that the metal tin is in the form of tin hydroxide Precipitate, through solid-liquid separation, get wet tin hydroxide and copper-containing waste water, wet tin hydroxide is burned in a rotary kiln, the average temperature is about 800 ℃, get tin hydroxide powder, wet tin hydroxide is burned in a rotary kiln The exhaust gas obtained from burning is discharged after being treated by the four-stage spraying system to meet the standard;

[0045] S3. Recovery of m...

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PUM

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Abstract

A tin stripping waste liquid treating method comprises the following steps: adding sulfate into a tin stripping waste liquid, adjusting the pH value to be 1.0-1.5, then adding a polyacrylamide flocculating agent to recycle tin, adding ammonia water with the concentration of 18-25% into copper-containing wastewater, conducting neutralization to recycle copper, and conducting further treatment on the wastewater. According to the method, sulfate is added into the tin stripping waste liquid, so that the effect of tin hydroxide colloid coagulation is achieved, and the usage amount is ammonia water can also be reduced; in the neutralization process, a certain amount of the PAM (polyacrylamide) flocculating agent is added, so that metallic tin is precipitated in the form of tin hydroxide; under the acidic condition, most metallic copper dissociates in a supernatant in the form of copper ions, the tin hydroxide is obtained through solid-liquid separation, and the filtrate is subjected to neutralization, so that copper in the filtrate is precipitated in the form of copper hydroxide, and the copper hydroxide is subjected to solid-liquid separation through a filter press, that is, in different acidity and alkalinity systems, the forms of metal ions are different, so that the metal ions are separated, tin and copper in the tin stripping waste liquid can be recycled in steps, and the resources in the tin stripping waste liquid can be fully utilized.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a treatment method for tin stripping waste liquid. Background technique [0002] A large amount of waste liquid will be produced in the PCB production process, and tin stripping waste liquid is one of the largest waste liquids. The waste liquid is produced in a large amount and has a high content of available resources, which contains a large amount of acid and metal tin, copper, etc. The current treatment methods for waste tin stripping liquid include neutralization method, chemical precipitation method, electrolysis method, etc. Among them, neutralization method is one of the more traditional methods for waste liquid treatment. The basic principle is to add alkali (or acid) to the waste acid (or waste alkali) solution to make the solution nearly neutral, and the metal ions in the solution are converted into metal hydroxides. This kind of treatment process recovers nitric acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C22B25/06C22B7/00
CPCY02P10/20
Inventor 蒋联武
Owner QINGYUAN XINLV ENVIRONMENTAL TECHNOLOGY CO LTD
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