Technology and device for treating mixed waste water produced by cold-rolling pickling of stainless steel and carbon steel

A technology of pickling wastewater and treatment process, which is applied in metallurgical wastewater treatment, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc., can solve problems such as difficult treatment, achieve convenient operation, reduce disposal costs, and reduce Effect of Environmental Burden

Inactive Publication Date: 2012-10-17
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN1418831 has reported a new process for the treatment of non-ferrous metal acidic wastewater by a two-stage method. It adopts one-stage lime neutralization and adds two-stage polyferric sulfate precipitation to treat non-ferrous metal acidic wastewater, making it reach the national first-class discharge standard, but this The process also needs to use other chemicals, and the sulfate radical in it will produce greater precipitation with the calcium ion in it, which makes subsequent treatment difficult

Method used

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  • Technology and device for treating mixed waste water produced by cold-rolling pickling of stainless steel and carbon steel
  • Technology and device for treating mixed waste water produced by cold-rolling pickling of stainless steel and carbon steel
  • Technology and device for treating mixed waste water produced by cold-rolling pickling of stainless steel and carbon steel

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Experimental program
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Effect test

Embodiment 1

[0043] Select 1000ml of stainless steel and carbon steel cold rolling mixed wastewater, its chemical composition is mainly: iron ion 3631.58mg / L, chromium ion 225.34mg / L, nickel ion 38.54mg / L, pH value is 1.2. The chromium-containing wastewater is first reduced in the regulating tank, and the trivalent chromium-containing wastewater formed after the reduction of the hexavalent chromium effluent is mixed with the stainless steel carbon steel pickling wastewater into the regulating tank, and the mixed wastewater of the regulating tank enters the first stage of PH regulating tank through the lifting pump.

[0044] The treatment process is as follows: (1) Pass the wastewater through the first stage of PH adjustment tank, add 96% slaked lime to adjust the pH to 3.7 (96% slaked lime consumes 9.413g), and at the same time aerate the bottom of the tank, the aeration intensity is 1 hour per hour ~10m 3 (air) / m 3 (wastewater);

[0045] The effluent enters the first stage of sedimentat...

Embodiment 2

[0055] Select 1000ml of mixed wastewater from stainless steel and carbon steel cold rolling. Its chemical composition is mainly: iron ion: 1885.28mg / L, chromium ion: 213.70mg / L, nickel ion: 41.67mg / L, and the pH value is 1.2. It is first reduced in the adjustment tank, and the trivalent chromium-containing wastewater formed after the reduction of the hexavalent chromium effluent is mixed with the stainless steel carbon steel pickling wastewater into the adjustment tank, and the mixed wastewater in the adjustment tank enters a PH adjustment tank through the lift pump.

[0056] Treatment process: (1) Pass the wastewater through the first PH adjustment tank, add 96% slaked lime to adjust the pH to 4.68 (96% slaked lime consumes 9.92g), stir for 30 minutes, and at the same time aerate the bottom of the pool, the aeration intensity is hourly 1~10m 3 (air) / m 3 (wastewater);

[0057] The effluent enters the first stage of sedimentation tank, adding 5ml of 2% PAC and 1ml of 3‰PAM, a...

Embodiment 3

[0067] Select 1000ml of mixed wastewater from stainless steel and carbon steel cold rolling, its chemical composition is mainly iron ion 4014.12mg / L, chromium ion 173.97mg / L, nickel ion 20.31mg / L, pH value is 1.01. It is first reduced in the adjustment tank, and the trivalent chromium-containing wastewater formed after the reduction of the hexavalent chromium effluent is mixed with the stainless steel carbon steel pickling wastewater into the adjustment tank, and the mixed wastewater in the adjustment tank enters the first stage of PH adjustment tank through the lift pump.

[0068] Treatment process: (1) Pass the wastewater through the first PH adjustment tank, add 96% slaked lime to adjust the pH to 3.74 (96% slaked lime consumes 9.5181g), stir for 30 minutes, and aerate the bottom of the tank at the same time, the aeration intensity is hourly 1~10m 3 (air) / m 3 (waste water);

[0069] The effluent enters the first stage of sedimentation tank, add 5ml of 2% PAC and 1ml of 3‰...

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Abstract

The invention relates to the field of treatment on metal ion-containing waste water and discloses a technology and a device for treating mixed waste water produced by cold-rolling pickling of stainless steel and carbon steel. The technology and the device are characterized in that according to effects of precipitation of different metal ions under different PH value conditions, a pH value and a precipitation process are adjusted sectionally so that separation of metal ions is realized. The technology and the device can effectively reduce use amounts of agents such as lime and the like, can reduce a production amount of sludge and is convenient for classified treatment on sludge.

Description

technical field [0001] The invention relates to the field of wastewater treatment containing metal ions, in particular to a stainless steel carbon steel cold rolling pickling mixed wastewater treatment process and device. Background technique [0002] The mixed wastewater of stainless steel and carbon steel cold rolling and pickling concentrates on the diversity of metals and acids produced by stainless steel pickling and the large amount of wastewater produced by carbon steel pickling. In the process of cold rolling annealing, normalizing, quenching, welding and other processing, black oxide scales are often formed on the surface of stainless steel, and its main components are NiO, Cr 2 o 3 , Fe 3 o 4 , FeO Cr 2 o 3 , FeO Cr 2 o 3 · Fe 2 o 3 , the carbon steel surface is FeO, Fe 2 o 3 , Fe 3 o 4 and other dense oxides. This kind of scale needs to be removed by combined processes such as shot blasting, high-temperature alkali leaching, molten salt electrolysis,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/56C02F1/66C02F103/16
Inventor 赵云峰张文志
Owner BAOSHAN IRON & STEEL CO LTD
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