Acid washing method for steel strip

Abstract

The invention belongs to the technical field of steel rolling, and particularly relates to an acid washing method for a steel strip. The acid washing method for the steel strip comprises the followingsteps: carrying out acid washing on the steel strip, generating acid mist during the acid washing for the steel strip, enabling the acid mist generated during the acid washing for the steel strip toenter into a washing tower and treating to form washing water, generating waste acid after the acid washing for the steel strip, and sequentially carrying out desilicication treatment and roasting treatment on the generated waste acid to obtain regenerated acid; carrying out strip rinsing on the steel strip subjected to the acid washing, and generating rinsing water during the rinsing for the steel strip; enabling the washing water and the rinsing water to enter into a rinsing water tank and mixing to form a first solution, mixing the first solution with new acid in a set ratio to form a second solution, wherein the set ratio is (6 to 8): (9 to 11); and mixing the second solution with the regenerated acid to form a third solution, and carrying out acid washing on the steel strip by virtueof the third solution. According to the acid washing method for the steel strip, recycling and reutilization for the waste acid, the acid mist and the rinsing water are realized, so that environment protection is much benefited.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, in particular to a steel strip pickling method. Background technique [0002] The pickling treatment of steel is widely used in the removal of surface oxide scales of cold-rolled sheet blanks, that is, hot-rolled sheets. For example, hot-rolled steel needs to be phosphating or coated before surface treatment to remove scale; welded pipes are galvanized or Other surface pretreatment before hot-dip plating and electroplating; surface treatment of annealed steel such as pipes, profiles, wires, etc. Similar treatment during the production of special steels. [0003] At present, pickling is still an indispensable process in steel production and steel surface treatment. Pickling is a method of using acid solution to remove iron oxides on the surface of the steel strip. The iron oxides on the surface of the steel strip react chemically with the acid solution to form salts that are dissolved in t...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a steel strip pickling method to solve the problem of environmental pollution caused by the volatilization of acid mist and the discharge of waste acid in the prior art

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