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Process for treating methylsulfonic acid plating solution generated in cold mill electrolytic tinning unit

A technology of electro-tinning unit and methanesulfonic acid, which is applied in the field of iron and steel, can solve the problems of poor treatment effect and achieve the effect of solving pollution

Inactive Publication Date: 2009-11-04
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The plating solution has strong stability and high COD (stock solution COD reaches 75000mg / L), and the COD of the produced wastewater is still 20000mg / L. The treatment process is: acidification, hydrogen peroxide oxidation, ferrite reaction, neutralization precipitation, biochemical treatment, treatment less effective

Method used

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  • Process for treating methylsulfonic acid plating solution generated in cold mill electrolytic tinning unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The treatment process of the methanesulfonic acid plating solution that the cold-rolled electrotin plating unit produces, it comprises the steps:

[0014] 1) The methanesulfonic acid plating solution (MSA) wastewater produced by the cold-rolled tinning unit enters a separate wastewater regulating tank, and the mixer is set to continuously stir (the residence time of the wastewater in the wastewater regulating tank is not limited); then the wastewater is lifted by a pump into the reaction pool;

[0015] 2) Add polyacrylamide (PAM) and Ca(OH) to the reaction pool 2 , to carry out neutralization and flocculation reactions, so that the pH in the wastewater is raised from 1 to 2 to 8, and Ca(OH) 2 The dosage of polyacrylamide (PAM) is determined according to the pH. The dosage of polyacrylamide (PAM) is 5mg / L (according to the addition of 5mg polyacrylamide per liter of wastewater in the reaction tank). for 12 minutes; then sent to the sedimentation tank;

[0016] 3) Stay...

Embodiment 2

[0019] The treatment process of the methanesulfonic acid plating solution that the cold-rolled electrotin plating unit produces, it comprises the steps:

[0020] 1) The methanesulfonic acid plating solution (MSA) wastewater produced by the cold-rolled tinning unit enters a separate wastewater regulating tank, and the mixer is set to continuously stir (the residence time of the wastewater in the wastewater regulating tank is not limited); then the wastewater is lifted by a pump into the reaction pool;

[0021] 2) Add polyacrylamide (PAM) and Ca(OH) to the reaction pool 2 , to carry out neutralization and flocculation reactions, so that the pH in the wastewater is raised to 6, Ca(OH) 2 The dosage of polyacrylamide (PAM) is determined according to the pH. The dosage of polyacrylamide (PAM) is 5mg / L (according to the addition of 5mg polyacrylamide per liter of wastewater in the reaction tank). for 10 minutes; then sent to the sedimentation tank;

[0022] 3) Stay in the sediment...

Embodiment 3

[0024] The treatment process of the methanesulfonic acid plating solution that the cold-rolled electrotin plating unit produces, it comprises the steps:

[0025] 1) The methanesulfonic acid plating solution (MSA) wastewater produced by the cold-rolled tinning unit enters a separate wastewater regulating tank, and the mixer is set to continuously stir (the residence time of the wastewater in the wastewater regulating tank is not limited); then the wastewater is lifted by a pump into the reaction pool;

[0026] 2) Add polyacrylamide (PAM) and Ca(OH) to the reaction pool 2 , to carry out neutralization and flocculation reactions, so that the pH in the wastewater is raised to 9, Ca(OH) 2 The dosage of polyacrylamide (PAM) is determined according to the pH. The dosage of polyacrylamide (PAM) is 5mg / L (according to the addition of 5mg polyacrylamide per liter of wastewater in the reaction tank). for 15 minutes; then sent to the sedimentation tank;

[0027] 3) Stay in the sediment...

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Abstract

The invention belongs to the steel field, and relates to a process for treating methylsulfonic acid plating solution (MSA) generated in a cold mill electrolytic tinning unit. The process for treating the methylsulfonic acid plating solution generated in the cold mill electrolytic tinning unit is characterized by comprising the following steps: 1) waste water of the methylsulfonic acid plating solution generated in the cold mill electrolytic tinning unit enters into a wastewater equalization pond to be stirred continuously; and the wastewater is lifted to enter a reaction tank by a pump; 2) polyacrylamide and Ca(OH)2 are added into the reaction tank to perform neutralization and flocculation reactions, so that pH in the wastewater is increased from 1-2 liters to 6-9 liters, dosage of the polyacrylamide is 5mg / L, the wastewater stays in the reaction tank for 10 to 15 minutes, and then is sent to a sedimentation tank; and 3) after staying in the sedimentation tank for 1 to 1.5 hours, stannum in the wastewater is formed into Sn(OH)2 sediment, and yielding water after Sn(OH)2 removal through sedimentation enters a diluted alkaline wastewater treatment system to be subjected to air supporting and biochemical treatment. The treatment process avoids influence of heavy metal stannum contained in the wastewater on a subsequent biochemical system.

Description

technical field [0001] The invention belongs to the field of iron and steel, and relates to a process for treating methanesulfonic acid plating solution (MSA) produced by a cold-rolling electro-tinning unit. Background technique [0002] The electroplating solution currently used in the tinning unit of the cold rolling factory is the phenolsulfonic acid plating solution system, referred to as PSA. The plating solution has strong stability and high COD (the COD of the stock solution reaches 75000mg / L), and the COD of the wastewater produced is still 20000mg / L. The treatment process is: acidification, hydrogen peroxide oxidation, ferrite reaction, neutralization and precipitation, biochemical treatment, treatment The effect is poor. [0003] In order to reduce the pollution of PSA wastewater discharged by electro-tinning units in cold-rolling factories, there has been a trend abroad to gradually use methanesulfonic acid coating baths (stock solution COD less than 25,000 mg / l)...

Claims

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Application Information

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IPC IPC(8): C02F1/66C02F1/56C02F101/20C02F103/16
Inventor 郭旻万焕堂
Owner WISDRI ENG & RES INC LTD
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