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Treatment technology for waste water of steel iron acid cleaning

A technology for pickling and treatment of iron and steel, applied in the fields of metallurgical wastewater treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc. The effect of wastewater reuse

Inactive Publication Date: 2007-02-14
李春放
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost is high, the operating cost is high, the operation is troublesome, and there are very few product manufacturers, which is not conducive to promotion

Method used

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Embodiment Construction

[0008] The present invention will be further described below. The present invention adopts a physical and chemical treatment method. Through a complete set of treatment equipment, corresponding chemicals are added, and the waste water completes a series of complex chemical reactions in each unit to achieve the purpose of solid-liquid separation, thereby removing pollution in waste water. Substances, this process is composed of wastewater regulating tank, neutralization reaction tank, primary sedimentation tank, cyclic contact oxidation device, secondary sedimentation tank and wastewater lifting system, dosing system, pressure gas supply system, cyclic contact oxidation iron removal system, etc.

[0009] The working principle and process of the overall system are as follows (taking sulfuric acid as an example for pickling):

[0010] 1. Neutralization: adding pre-prepared calcium hydroxide (Ca(OH) 2 ) and the residual sulfuric acid and ferrous sulfate in the waste water react ch...

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Abstract

The present invention relates to waste water treating technology, and is especially the technological process of eliminating acid radical and iron ion from iron and steel pickling waste water and reusing the treated waste water. Except neutralizing and precipitating steps, the technological process includes also one circular contacting oxidation step, in which the waste water through neutralizing and precipitating treatment is treated in contacting oxidation device so that the bivalent iron ion reacts with water and oxygen to produce water insoluble trivalent iron ion, and one secondary precipitation step to eliminate trivalent iron ion before the clear water is reused. The present invention makes it possible to realize zero discharge.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment technology, in particular to a treatment technology for removing acid radicals and iron ions from steel pickling wastewater to realize wastewater reuse. Background technique [0002] In the degreasing and derusting treatment of the steel surface after cold rolling and the degreasing and derusting treatment of the steel surface before coating, pickling is often used for surface treatment, and the washing after pickling forms a large amount of acidic wastewater. In the past, neutralization and precipitation treatment was generally used in the treatment of acidic wastewater, which can only solve the pH value and remove acid radicals. The metal salts in the wastewater cannot be removed, and the ferrous salts in the steel pickling wastewater are still dissolved in the wastewater and it is difficult to remove them from the wastewater. It is separated from the water and discharged into the s...

Claims

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Application Information

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IPC IPC(8): C02F1/66C02F1/52C02F1/72C02F103/16
Inventor 周盘岳
Owner 李春放
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