Method for improving rinsing quality of strip steel in pickling and rolling unit

A strip and unit technology, applied in the field of improving the strip rinsing quality of pickling mills, can solve the problems that the strip rinsing quality is difficult to meet the standard requirements, the surface is prone to oxidation reaction, the surface reflectivity is insufficient, etc., and the strip rinsing can be improved. quality, improving the quality of cold-rolled products, reducing the effect of oxidation

Inactive Publication Date: 2018-06-29
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual production process, it is found that the rinsing quality of the strip is difficult to meet the standard requirements. After rinsing, the surface reflectance is less than 85%, and the surface is prone to oxidation and blackening, which has a great impact on product quality.

Method used

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  • Method for improving rinsing quality of strip steel in pickling and rolling unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: first the condensed water in the condensed water tank 9 is pumped into the 5# rinse tank 6, and observe the numerical value of the conductivity detector 13 in the 5# rinse tank 6, and find that the conductivity detector 13 in the 5# rinse tank 6 The detected conductivity is 35μs / cm, and the conductivity detector 13 sends a control command to the condensed water tank 9 to control the condensed water supply at 12-15m³ / h; The spray valve 7 no longer draws condensed water into the pre-rinse tank 1 through the spray water pipe 8; at this time, the pH value of the rinse water in the rinse tank 2 of 1# is 1.5, and the pH value of the rinse water in the rinse tank 3 of 2# The value is 3.0, the pH value of the rinse water in the 3# rinse tank 4 is 4.0, the pH value of the rinse water in the 4# rinse tank 5 is 5.5, and the pH value in the 5# rinse tank 6 is 7; The strip after pickling in tank 14 is rinsed sequentially through pre-rinsing tank 1, 1# rinsing tank 2, 2...

Embodiment 2

[0016] Embodiment 2: first the condensed water in the condensed water tank 9 is pumped into the 5# rinsing tank 6, and observe the numerical value of the conductivity detector 13 in the 5# rinsing tank 6, and find that the conductivity detector 13 in the 5# rinsing tank 6 The detected conductivity is 25μs / cm, and the conductivity detector 13 sends a control command to the condensed water tank 9 to control the condensed water supply at 8-10m³ / h; The spray valve 7 no longer draws the condensed water into the pre-rinse tank 1 through the spray water pipe 8; at this time, the pH value of the rinse water in the 1# rinse tank 2 is 2.0, and the pH value of the rinse water in the 2# rinse tank 3 The value is 3.5, the pH value of the rinse water in the 3# rinse tank 4 is 4.8, the pH value of the rinse water in the 4# rinse tank 5 is 6.2, and the pH value in the 5# rinse tank 6 is 7; The strip after pickling in tank 14 is rinsed through pre-rinsing tank 1, 1# rinsing tank 2, 2# rinsing ...

Embodiment 3

[0017] Embodiment 3: first the condensed water in the condensed water tank 9 is pumped into the 5# rinse tank 6, and observe the numerical value of the conductivity detector 13 in the 5# rinse tank 6, and find that the conductivity detector 13 in the 5# rinse tank 6 The detected conductivity is 13μs / cm, and the conductivity detector 13 sends a control command to the condensed water tank 9 to control the condensed water supply at 6-6.5m³ / h; Close the spray valve 7, and no longer pump the condensed water into the pre-rinse tank 1 through the spray water pipe 8; The pH value of the rinsing water in 3.8, 3# rinsing tank 4 is 4.7, the pH value of rinsing water in 4# rinsing tank 5 is 6.0, and the pH value in 5# rinsing tank 6 is 7; The plates and strips after pickling in wash tank 14 are rinsed sequentially through pre-rinse tank 1, 1# rinse tank 2, 2# rinse tank 3, 3# rinse tank 4, 4# rinse tank 5 and 5# rinse tank 6, after rinsing It was found that the surface reflectivity of th...

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Abstract

The invention relates to a method for improving the rinsing quality of strip steel in a pickling and rolling unit. The method comprises the following steps: condensate water is pumped from a condensate water tank into a 5# rinsing tank, and the condensate water sequentially enters all rinsing tanks under the action of gravity; a spraying valve is opened, and the condensate water in the 1# rinsingtank is pumped into a pre-rinsing tank through a spray water tube; and pickled plate strips are controlled to sequentially go through the pre-rinsing tank and the five rinsing tanks to complete the rising of the strip steel. The improvement of the method is characterized by controlling the pH value of rising water in the 1# rinsing tank to the 5# rinsing tank; and the improvement is concretely characterized in that the pH value of the 1# rinsing tank is controlled at 1.5-2.5, the pH value of the rinsing water in the 2# rinsing tank to the 5 # rinsing tank rises stepwise, and the pH value of the rinsing water in the 5# rinsing tank reaches 7. The method can effectively reduce the oxidation after pickling of the surface of the plate strips and improve the rinsing quality of the plate strips,allows the surface reflectance of the rinsed plate strips to reach 90% or more, and greatly improves the quality of cold rolled products.

Description

technical field [0001] The invention relates to a method for improving the strip rinsing quality of an acid rolling mill, and belongs to the technical field of strip rinsing. Background technique [0002] The pickling rolling unit is a combined pickling and cold rolling unit. Pickling is the first treatment process of cold rolling. Its main function is to remove the iron oxide layer adhering to the steel surface, prepare for subsequent processing, and prevent New defects appear in the washing process; rinsing is the key process after pickling to further improve the surface quality of the strip. The rinsing section consists of one-stage pre-rinsing and five-stage rinsing. The medium used in the rinsing section is rinsing water, which is mainly composed of condensed water obtained by cooling the pickling section and dryer steam after heat exchange. When the steam condensed water is insufficient, desalted water is used as supplementary water. The condensed water is pumped int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G3/02
CPCC23G3/029
Inventor 朱坦华周建军张维召耿波曹永杰王伟丁志广陈晓丽
Owner HANDAN IRON & STEEL GROUP
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