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Method for treating stainless steel cold rolling pickling waste water

A technology for pickling wastewater and treatment methods, which is applied in metallurgical wastewater treatment, neutralized water/sewage treatment, reduced water/sewage treatment, etc., and can solve the problems of inability to reuse raw materials for steelmaking furnaces, high cost of chemicals, and high treatment costs , to achieve the effect of stable fluoride ion concentration, lower drug costs, and lower total treatment costs

Inactive Publication Date: 2011-03-30
NINGBO BAOXIN STAINLESS STEEL
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Problems solved by technology

[0005] (1) The cost of chemicals is relatively high, and the actual performance of a stainless steel factory in 2007 reached 9.67 yuan / m 3 ;
[0006] (2) The generated sludge is a mixture, especially containing fluoride ions, and cannot be reused as a raw material for steelmaking furnaces;
[0007] (3) The generated sludge is hazardous waste, which needs to be treated according to the route designated by the local environmental protection bureau, and the treatment cost is relatively high. The actual performance of a stainless steel factory in 2007 was 8.58 yuan / m 3

Method used

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  • Method for treating stainless steel cold rolling pickling waste water
  • Method for treating stainless steel cold rolling pickling waste water
  • Method for treating stainless steel cold rolling pickling waste water

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the examples.

[0031] A treatment method for stainless steel cold-rolled pickling wastewater, characterized in that it comprises the following process steps in sequence:

[0032] 1) Put the mixed acid pickling wastewater into the acid wastewater regulating tank to adjust the water quality, then enter the pretreatment tank for preliminary neutralization, and control the pH value at 5-6 by adding lime milk;

[0033] 2) Put the neutral salt electrolysis wastewater or sulfuric acid electrolysis wastewater into the neutral salt wastewater adjustment tank to adjust the water quality, and then enter the first-level reduction tank and the second-level reduction tank in turn, and reduce the hexavalent chromium in the wastewater to three by adding a reducing agent. Valence chromium;

[0034] The reducing agent is hydrochloric acid and sodium bisulfite, the amount of reducing agent added is contr...

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Abstract

The invention discloses a method for treating stainless steel cold rolling pickling waste water, which adopts a lime milk pretreatment process and a waste water segmental treatment process and comprises the following steps of: firstly, performing lime milk pretreatment on the waste water to control the pH value between 5 and 6; secondly, adding liquid caustic soda to remove heavy metal ions in the waste water so as to form a metal oxide precipitate; and finally, treating fluorine ions, namely adding polyaluminium chloride and lime milk to remove the fluorine ions, and filtering and discharging the waste water after adjusting the pH. The treatment method has good using effect, the waste water reaches the required standard and is stable, the sludge quantity is small, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, in particular to a treatment method for stainless steel cold rolling pickling wastewater. Background technique [0002] The stainless steel pickling line mainly produces two kinds of wastewater, one is the neutral salt wastewater containing hexavalent chromium produced by the neutral salt electrolysis section, and the other is the acid wastewater produced by the mixed acid pickling section. The current treatment methods for these two types of wastewater are: [0003] 1. Traditional neutralization method: [0004] Generally, stainless steel factories currently use the traditional lime neutralization treatment method to treat pickling wastewater. Its advantages are stable process, stable water quality, and relatively simple operation control; but its disadvantages are also obvious: [0005] (1) The cost of chemicals is relatively high, and the actual performance of a stain...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01G49/02C01G37/00C01G53/04C01G45/02C02F1/66C02F1/70C02F103/16C02F101/14
Inventor 柳雨魏崴
Owner NINGBO BAOXIN STAINLESS STEEL
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