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Process method for high-efficiency water-saving cleaning

A process method and high-efficiency technology, which is applied in the field of high-efficiency water-saving cleaning technology, can solve problems such as instability, slow cleaning speed, and poor cleaning effect, and achieve the effects of automatic control, improved cleaning speed, and water conservation

Inactive Publication Date: 2013-03-20
TIANJIN YIBO STEEL MAKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the cleaning of the steel strip after pickling in the pickling process is simply to press the steel strip into the cleaning tank by the pressure roller and pass through the cleaning water. The cleaning effect is not good, the surface quality of the strip steel is poor and unstable, the cleaning speed is slow, the pickling solution is wasted, and the production cost is increased

Method used

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  • Process method for high-efficiency water-saving cleaning
  • Process method for high-efficiency water-saving cleaning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A high-efficiency water-saving cleaning process: heat soft water to 80°C and then pressurize it through a water pump, the pressure is 0.3Mpa, and 5t / h cleaning water enters the cleaning tank, and it is cleaned by four-stage spraying, and the flow rate of the rinse pump is controlled to 50m 3 / h, the actual consumption is 5m 3 / h, 4t / h acid-containing wastewater exits the cleaning tank, then enters the pH=1~2 acid-containing wastewater into the wastewater tank, and then transfers to the acid regeneration unit.

Embodiment 2

[0019] The efficient water-saving cleaning process method is: soft water heating (85°C) Acid-resistant water pump pressurization Cleaning water into the cleaning tank Four-stage spray cleaning (6t / h) Acidic waste water out of the cleaning tank (4t / h) Acidic wastewater (pH=1) enters the wastewater tank Acid regeneration unit.

[0020] Adoption of the present invention, the steel strip 1 surface that comes out from the acid solution of the pickling tank is accompanied by part of the pickling solution. After passing through the acid squeezing roller 2, most of the acid solution is squeezed out, but a small amount of acid solution still adheres. The steel strip enters the cleaning tank 4, and there are four sets of spray pipes 3 connected to four sets of water pumps 8 in the cleaning tank, and four-stage hot water (80°C) powerful spray cleaning is carried out through the spray pipe 3. The further the spray water is, the more acidic it is. Weak, finally after the ...

Embodiment 3

[0022] High-efficiency water-saving cleaning process: heat soft water to 95°C and then pressurize it through a water pump with a pressure of 0.4Mpa. 6t / h cleaning water enters the cleaning tank, and is cleaned by four-stage spraying, and the flow rate of the rinse pump is controlled to 50m 3 / h, actually use 6m 3 / h, 4t / h acid-containing wastewater exits the cleaning tank, then enters the pH=1~2 acid-containing wastewater into the wastewater tank, and then transfers to the acid regeneration unit.

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Abstract

The invention discloses a process method for high-efficiency water-saving cleaning. The process method comprises the steps of heating a soft water to a temperature of 80-95 DEG C; pressing with a water pump with the pressure being 0.3-0.4 MPa; introducing cleaning water in a cleaning tank at a speed of 5-6 t / h; cleaning with four-stage spray; controlling rinsing pump flow to be 50 m<3> / h, wherein a real flow is 5-6 m<3> / h; discharging acid-containing wastewater from the cleaning tank; introducing an acid-containing wastewater with a pH value of 1-2 into a wastewater tank; and then transferring into an acid regeneration unit. The process flow is reasonable, has fast cleaning speed with the cleaning speed increased by 0.8-1 time, high efficiency and good quality, and is energy-saving and cost-reducing. The water usage amount is only 50-60% that of an original process; the acid-containing wastewater is pumped into the acid regeneration unit for reuse; and water saving-effect is significant. The process method is suitable for automatic production line, and has wide application prospects.

Description

technical field [0001] The invention discloses a high-efficiency water-saving cleaning process, in particular to a process for cleaning hot-rolled steel plates or steel strips after pickling, which is suitable for the cleaning process of a hot-rolled plate and strip pickling production line. Background technique [0002] After the steel strip has been pickled to remove the oxide scale on the surface, it comes out of the pickling tank and is squeezed out by the extrusion roller to squeeze out most of the acid solution, but a small amount of acid solution is still attached. If some acid liquid attached to the surface of the steel strip is not cleaned, the steel strip will be corroded, which will bring difficulties to the subsequent processes such as passivation, oiling and cold rolling, and cause product quality problems. Therefore, strip cleaning is an indispensable and important part of cold rolling production. [0003] At present, the cleaning of the steel strip after pick...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/24C23G3/02
Inventor 宋书成齐力峰
Owner TIANJIN YIBO STEEL MAKING