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Harmless treatment device and process for steel pickling waste liquid

A technology for iron and steel pickling waste liquid, harmless treatment, applied in the direction of metallurgical wastewater treatment, oxidized water/sewage treatment, filtration treatment, etc., can solve the problems of increasing the cost burden of enterprises, lack of practical application, and high technical requirements , to achieve the effect of clear and transparent water quality, small footprint and wide range of process adaptation.

Inactive Publication Date: 2019-02-22
高密天福家纺有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Adding lime powder or lime emulsion for chemical neutralization and precipitation treatment will generate a large amount of waste residue and cause secondary pollution. Further harmless treatment of waste residue is required, which not only increases the cost burden of the enterprise, but also causes useful waste of resources;
[0005] 2. Recycling the waste acid in the waste acid liquid, but the technical requirements are high, the process is complicated, the equipment investment is large, the operating cost is high, and the waste water needs to be treated with additional equipment, so it is hardly used in practice

Method used

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  • Harmless treatment device and process for steel pickling waste liquid

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Effect test

Embodiment 1

[0038] A kind of harmless treatment process of iron and steel pickling waste liquid, comprises the following steps:

[0039] (1) The acidic iron-containing ion waste liquid in the waste liquid storage tank 1 is mixed with the sodium hydroxide solution in the lye tank 5 in the Venturi mixer 19, and the mixed solution enters the settling tank 2 for reaction, and the pH value of the mixed solution is controlled In 7.5, make the waste solution H + with OH - combine into water to remove acid, and at the same time, make Fe 2+ , Fe 3+ respectively generate Fe(OH) 2 , Fe(OH) 3 Precipitation, sediment and water are separated in the sedimentation tank 2, and the water enters the sand filter tank 3 to further remove suspended impurities, and the clean water is discharged from the clean water drainage pipe 16 for reuse. The backwash water pipeline 17 is pumped into clear water to backwash the sand filter tank 3, and the backwash water is discharged into the waste liquid storage tank ...

Embodiment 2

[0044] A kind of harmless treatment process of iron and steel pickling waste liquid, comprises the following steps:

[0045] (1) The acidic iron-containing ion waste liquid in the waste liquid storage tank 1 is mixed with the sodium hydroxide solution in the lye tank 5 in the Venturi mixer 19, and the mixed solution enters the settling tank 2 for reaction, and the pH value of the mixed solution is controlled At 9, make the waste solution H + with OH - combine into water to remove acid, and at the same time, make Fe 2+ , Fe 3+ respectively generate Fe(OH) 2 , Fe(OH) 3 Precipitation, sediment and water are separated in the sedimentation tank 2, and the water enters the sand filter tank 3 to further remove suspended impurities, and the clean water is discharged from the clean water drainage pipe 16 for reuse. The backwash water pipeline 17 is pumped into clear water to backwash the sand filter tank 3, and the backwash water is discharged into the waste liquid storage tank 1 ...

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Abstract

The invention discloses a harmless treatment device and process for steel pickling waste liquid, and belongs to the technical field of waste liquid recovery and treatment. The device comprises a wasteliquid storage tank, a sedimentation tank and a sand filter tank which are sequentially connected by a pipeline, the sedimentation tank is communicated with the sand filter tank through a drainage pipe, and a venturi mixer is disposed between the sedimentation tank and the waste liquid storage tank and communicated with a lye tank through a pipeline. The bottom of the sedimentation tank is connected with a concentration tank which is communicated with the waste liquid storage tank through a wastewater pipeline. The concentration tank is sequentially connected with a pickling waste acid tank,a filtering device and a reaction kettle through a residue discharging pipeline, a scrap iron tank is connected to the top of the pickling waste acid tank, and a stabilizer tank and an oxidizer tank are connected to the top of the reaction kettle. Wastewater and waste acid produced by steel pickling in steel machining enterprises are comprehensively treated and utilized, and no wastewater, waste gas or waste residues are produced, so that the enterprises can truly achieve harmless clean production.

Description

technical field [0001] The invention relates to the technical field of waste liquid recovery and treatment, in particular to a harmless treatment device and process for iron and steel pickling waste liquid. Background technique [0002] Iron and steel processing enterprises generally use hydrochloric acid and sulfuric acid pickling to remove rust on the steel surface, and then wash with clean water. This will produce a large amount of acidic wastewater and pickling waste acid mainly containing iron ions. If it is discharged directly, it will cause pollution. The environment is seriously polluted. [0003] At present, there are mainly the following methods for the treatment of these waste acids and waste water in China: [0004] 1. Adding lime powder or lime emulsion for chemical neutralization and precipitation treatment will generate a large amount of waste residue and cause secondary pollution. Further harmless treatment of waste residue is required, which not only increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F9/00C02F1/001C02F1/52C02F1/66C02F1/722C02F1/76C02F2001/007C02F2103/16
Inventor 张琪舜李先农
Owner 高密天福家纺有限公司
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