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Washing agent for removing scale of cold-rolling acid-pickling regeneration set pipeline and using method thereof

A technology of cleaning agent and cold-rolled acid, which is applied in the field of water treatment, can solve problems such as incomplete cleaning, large potential safety hazards on site, and personal safety hazards of hydrofluoric acid, and achieves easy mastery of the preparation method and use method, and little harm to the human body , Excellent cleaning effect

Active Publication Date: 2018-11-30
鞍钢栗田(鞍山)水处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In iron and steel enterprises, the pickling waste liquid mainly comes from the cold rolling process, which is mainly to remove the oxide scale and rust on the surface of the strip steel coil. The main components of the pickling waste liquid are hydrochloric acid, silicate, grease, chlorine The pickling waste acid is mainly ferrous, and then the pickling waste acid is regenerated. In the process of regenerating the pickling waste acid, scaling and blockage of the inner wall of the regenerated acid pipeline often occur, and the formed scale layer is hard, mainly composed of iron salt scale and silicon Salt scale is the main factor. If the dirt is not cleaned in time, a series of problems will occur in the subsequent equipment such as pickling pumps, filters, nozzles, etc. within a month, which will eventually affect the operation of the acid regeneration process. At present, there is no effective method to To suppress pipeline scaling, the only way to improve the operation of the equipment is to use regular cleaning. Most of the cleaning agents commonly used today have poor cleaning effects on the silicate scale formation, and there is a phenomenon of incomplete cleaning, which cannot be achieved after repeated cleaning. Anticipated requirements, long cleaning time delays acid regeneration output directly affects cold-rolled sheet production
[0003] Due to the limitation of cold rolling production process conditions, the cleaning time of the acid regeneration pipeline that can be given is 10 hours. It is difficult for general inorganic acids and organic acids to meet the cleaning requirements. Some cleaning agents use hydrofluoric acid as the main cleaning agent to achieve rapid cleaning effects. Cleaning with cleaning agent, although the cleaning speed and effect can be guaranteed, but due to the strict operation requirements of hydrofluoric acid, if you do not pay attention to the frequent occurrence of hydrofluoric acid hazards to personal safety, there are great potential safety hazards on site, and it is not suitable to control

Method used

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  • Washing agent for removing scale of cold-rolling acid-pickling regeneration set pipeline and using method thereof
  • Washing agent for removing scale of cold-rolling acid-pickling regeneration set pipeline and using method thereof
  • Washing agent for removing scale of cold-rolling acid-pickling regeneration set pipeline and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Prepare the cleaning agent as follows:

[0042] 1) Add 53 parts of ammonium bifluoride, 15 parts of sodium fluoride and 20 parts of 1 / 3 water into the melting tank A, mix and stir for 30 minutes to obtain the mixed solution a;

[0043] 2) Add 30 parts of trichlorethylene and 28 parts of diethyl ether into the melting tank B, mix and stir for 15 minutes to obtain the mixed solution b;

[0044] 3) Add 18 parts of polyvinylpyrrolidone K30 and 40 parts of 2 / 3 water into the melting tank C, stir for 30 minutes, then add 38 parts of nitric acid and 15 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer , continue mixing and stirring for 20 minutes to obtain a mixed solution c;

[0045] 4) Inject the above mixed solution a, mixed solution b and mixed solution c into the fusion pipeline at the same time, ensure that the fusion time is not less than 30 seconds, set the length of the fusion pipeline, and the mixed solution after fusion will be the cleaning ...

Embodiment 2

[0051] Prepare the cleaning agent as follows:

[0052] 1) Add 50 parts of ammonium bifluoride, 18 parts of sodium fluoride and 25 parts of 1 / 3 water into the melting tank A, mix and stir for 30 minutes to obtain the mixed solution a;

[0053] 2) Add 25 parts of trichlorethylene and 35 parts of diethyl ether into the melting tank B, mix and stir for 15 minutes to obtain the mixed solution b;

[0054] 3) Add 22 parts of polyvinylpyrrolidone K30 and 50 parts of 2 / 3 water into the melting tank C, stir for 30 minutes, then add 30 parts of nitric acid and 12 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer , continue mixing and stirring for 20 minutes to obtain a mixed solution c;

[0055] 4) Inject the above mixed solution a, mixed solution b and mixed solution c into the fusion pipeline at the same time, ensure that the fusion time is not less than 30 seconds, set the length of the fusion pipeline, and the mixed solution after fusion will be the cleaning ...

Embodiment 3

[0061] Prepare the cleaning agent as follows:

[0062] 1) Add 47 parts of ammonium bifluoride, 22 parts of sodium fluoride and 22 parts of 1 / 3 water into the melting tank A, mix and stir for 30 minutes to obtain the mixed solution a;

[0063] 2) Add 18 parts of trichlorethylene and 30 parts of diethyl ether into the melting tank B, mix and stir for 15 minutes to obtain the mixed solution b;

[0064] 3) Add 25 parts of polyvinylpyrrolidone K30 and 44 parts of 2 / 3 water into the melting tank C, stir for 30 minutes, then add 35 parts of nitric acid and 18 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer , continue mixing and stirring for 20 minutes to obtain a mixed solution c;

[0065] 4) Inject the above mixed solution a, mixed solution b and mixed solution c into the fusion pipeline at the same time, ensure that the fusion time is not less than 30 seconds, set the length of the fusion pipeline, and the mixed solution after fusion will be the cleaning ...

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Abstract

The invention provides a washing agent for removing scale of a cold-rolling acid-pickling regeneration set pipeline and a using method thereof. The washing agent is prepared from the following components in parts by weight: 40-60 parts of ammonium hydrogen fluoride, 5-25 parts of sodium fluoride, 10-30 parts of trichloroethylene, 20-40 parts of ethyl ether, 20-50 parts of nitric acid, 10-30 partsof polyvinylpyrrolidone K30, 5-25 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid and 60-80 parts of water. The washing agent is suitably used for washing and removing scale of the cold-rolling acid-pickling regeneration set pipeline, is excellent in washing effect, relatively low in harm on human body, high in safety, low in pollution after being discharged, rapid in scale removing speed, high in scale removing efficiency and excellent in effect of washing iron salt scale and silicate scale, can replace hydrofluoric acid for use, and is capable of thoroughly washing the acid regeneration pipeline in 10 hours.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a cleaning agent for descaling pipelines of a cold-rolled pickling regeneration unit and a use method thereof. Background technique [0002] In iron and steel enterprises, the pickling waste liquid mainly comes from the cold rolling process, which is mainly to remove the oxide scale and rust on the surface of the strip steel coil. The main components of the pickling waste liquid are hydrochloric acid, silicate, grease, chlorine The pickling waste acid is mainly ferrous, and then the pickling waste acid is regenerated. In the process of regenerating the pickling waste acid, scaling and blockage of the inner wall of the regenerated acid pipeline often occur, and the formed scale layer is hard, mainly composed of iron salt scale and silicon If the dirt is not cleaned in time, a series of problems will occur in the subsequent equipment such as pickling pumps, filters, nozzles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/02
CPCC23G1/02
Inventor 胡文军张柏鸿孙辉王坤鹏李红李俊峰张宇张冲吕鹏程
Owner 鞍钢栗田(鞍山)水处理有限公司
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