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Method for treating liquid waste of silicon steel passivation solution

A treatment method and technology of passivation solution, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc. COD and chromium concentration can not meet the standard discharge and other problems, to achieve the effect of recycling waste liquid, stable treatment and small footprint

Inactive Publication Date: 2010-12-22
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose a new treatment method to solve the problem that COD and heavy metal chromium cannot be effectively and synchronously removed in the existing silicon steel passivation liquid waste treatment method, and the concentration of COD and chromium in the effluent cannot be discharged up to the standard. Synchronous removal with COD, and reduce the concentration of COD and chromium in the waste liquid

Method used

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  • Method for treating liquid waste of silicon steel passivation solution
  • Method for treating liquid waste of silicon steel passivation solution
  • Method for treating liquid waste of silicon steel passivation solution

Examples

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Embodiment 1

[0025] What this embodiment deals with is 8m 3 Silicon steel passivation liquid waste 1: original waste liquid pH=0.5-2, Cr 6+ The concentration is 2958.89mg / L, and the COD concentration is 1351.3mg / L. The steps of the specific embodiment are as follows: first, the silicon steel passivation liquid waste liquid is collected through the acid-base adjustment sedimentation tank 1, and the alkali is added to adjust the pH to 3, mixed and homogenized, and then injected into the reaction tank 2 by the sewage pump, and FeSO is added at the same time 4 ·7H 2 O658.08kg and 30% H 2 o2 536.54kg, the waste liquid flows into the neutralization tank 3 by itself after reacting in the reaction tank 2 for 60 minutes, adds alkali to adjust the pH to 7, stays for 5 minutes, then flows into the sedimentation tank 4 by gravity, and after 30 minutes of precipitation, the supernatant is discharged up to the standard, and the sedimentation sludge is passed through After the chromium slag concentra...

Embodiment 2

[0027] What this embodiment deals with is 20m 3 Silicon steel passivation liquid waste 2: original waste liquid pH=2-3, Cr 6+ The concentration is 295.65mg / L, and the COD concentration is 135.13mg / L. The steps of the specific embodiment are as follows: first, the silicon steel passivation liquid waste liquid is collected through the acid-base adjustment sedimentation tank 1, and the alkali is added to adjust the pH to 4, mixed and homogenized, and then injected into the reaction tank 2 by the sewage pump, and FeSO is added at the same time 4 ·7H 2 O164.40kg and 30% H 2 o 2 134.03kg, the waste liquid flows into the neutralization tank 3 by itself after reacting in the reaction tank 2 for 60 minutes, adds alkali to adjust the pH to 8, stays for 7 minutes, then flows into the sedimentation tank 4 by gravity, and after 40 minutes of precipitation, the supernatant is discharged up to the standard, and the sedimentation sludge is passed through After the chromium slag concentra...

Embodiment 3

[0029] What this embodiment deals with is 10m 3 Silicon steel passivation liquid waste 3: original waste liquid pH=1-2, Cr 6+ The concentration is 428.94mg / L, and the COD concentration is 529.74mg / L. The steps of the specific embodiment are as follows: first, the silicon steel passivation liquid waste liquid is collected through the acid-base adjustment sedimentation tank 1, and the alkali is added to adjust the pH to 3, mixed and homogenized, and then injected into the reaction tank 2 by the sewage pump, and FeSO is added at the same time 4 ·7H 2 O119.25kg and 30% H 2 o 2 97.23kg, the waste liquid flows into the neutralization tank 3 by itself after reacting in the reaction tank for 60 minutes, adds alkali to adjust the pH to 7, stays for 6 minutes, then flows into the sedimentation tank 4 by gravity, and after 35 minutes of precipitation, the supernatant is discharged up to the standard, and the precipitated sludge is passed through chromium After being concentrated in ...

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Abstract

The invention discloses a method for treating liquid waste of silicon steel passivation solution, which belongs to the technical field of the 'three wastes' (waste gas, waste water and industrial residue) treatment in the iron and steel industry. The method comprises the following steps of: firstly, collecting, mixing and homogenizing the liquid waste of the silicon steel passivation solution by using an acid-base adjusting tank, wherein the pH value is adjusted to be 3 to 4; secondly, injecting the liquid waste into a reaction tank by using a sewage pump; thirdly, adding FeSO4.7H2O and 30 percent hydrogen peroxide (H2O2) into the reaction tank so that the molar ratio of iron ion to H2O2 to chromium ion is 5.2:10.4:1, wherein the temperature is maintained to be between 15 and 35 DEG C and the residence time is 60 minutes; fourthly, after the reaction treatment, allowing the mixed solution to automatically flow into a neutralizing tank, adding alkali to adjust the pH value to be 7 to 8, and allowing the mixed solution to automatically flow into a sedimentation tank; and finally, discharging supernatant in the sedimentation tank, allowing settled sludge to enter a chromium residue concentration tank to concentrate and then automatically flow back to the acid-base adjusting tank, allowing the remained chromium residues to enter a centrifugal machine to dehydrate, recovering the dehydrated residue cakes and allowing residue liquid to flow back to the acid-base adjusting tank. By the method, the chromium and chemical oxygen demand (COD) can be removed synchronously, the chromium in the liquid waste can be recovered, and the reclamation of the liquid waste of the silicon steel passivation solution can be realized.

Description

technical field [0001] The invention belongs to the technical field of "three wastes" treatment in the iron and steel industry, and in particular relates to a treatment method for silicon steel passivation liquid waste. Background technique [0002] In the production process, in order to prevent the silicon steel from being oxidized and corroded, it is necessary to passivate its surface with a passivation solution. Although the passivation solution can be recycled, different types of passivation solutions are required for different specifications of silicon steel materials. Therefore, when changing the type of passivation solution and cleaning the machine, some waste liquid of passivation liquid will be discharged. These waste liquids contain a large amount of chromium, COD, and acid, which are extremely harmful and must be treated to meet the standards before they can be discharged. [0003] Commonly used methods for treating chromium-containing industrial wastewater at ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/70C02F1/72
Inventor 张文艺李秋燕罗鑫李定龙姚立荣张千峰
Owner CHANGZHOU UNIV
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