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Pickling acid regeneration control method

A control method and acid regeneration technology, applied in the field of steel rolling, can solve the problems of reducing operating costs, disadvantage, and inability to achieve efficient utilization of waste acid.

Pending Publication Date: 2022-01-28
BEIJING SHOUGANG COLD ROLLED SHEET
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the pickling acid regeneration control method adopted in the prior art cannot achieve efficient utilization of waste acid, which is not conducive to reducing operating costs

Method used

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Embodiment Construction

[0021] The embodiment of the present application provides a pickling acid regeneration control method, which can reasonably control the free acid concentration of waste acid discharged from the pickling section without affecting the pickling quality, reduce the amount of rinse water, and reduce the start and stop of acid regeneration times, in order to comprehensively reduce the operating cost of pickling and acid regeneration.

[0022] In order to better understand the above-mentioned technical solution, the above-mentioned technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The pickling acid regeneration control method provided by this application can be applied to cold rolling systems, such as figure 1 As shown, the cold rolling system includes a pickling section 10 , a rinsing section 20 and a hydrochloric acid regeneration treatment section 30 , and the hydrochloric acid regenerat...

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Abstract

The invention discloses a pickling acid regeneration control method, which is applied to a cold rolling system, and comprises the following steps: adjusting the amount of waste acid discharged in a pickling section, so that the concentration of free acid contained in the waste acid flowing to a waste acid tank is 40-50g / L; and the water supplementing amount of desalted water in the rinsing line is controlled to be 4-5 m<3> / h; detecting the liquid level of a rinsing water tank, and if the liquid level of the rinsing water tank is 20-25% lower than the full liquid level, supplementing desalted water with the amount smaller than or equal to 30% of the full liquid level to the rinsing water tank; based on the concentration of the free acid and the concentration of the rinsing water generated by the rinsing line, controlling the injection amount of the waste acid and the rinsing water received by the hydrochloric acid regeneration treatment system; based on the injection amount of the waste acid and the rinsing water, controlling the hydrochloric acid regeneration treatment system to perform reverse reaction to generate target gas, and conveying the target gas to a regeneration acid tank, so that the acid concentration of regeneration acid generated in the regeneration acid tank is 190-210 g / L. The method can effectively reduce the operation cost of acid pickling and acid regeneration.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a pickling acid regeneration control method. Background technique [0002] In the field of steel rolling technology, the main purpose of the pickling section is to pickle the oxide scale on the surface of the strip steel with acid (such as hydrochloric acid), put the strip steel after pickling, and then rinse it through the rinsing section to remove the surface oxide scale of the strip steel. The residual hydrochloric acid is convenient for the subsequent treatment process. Among them, the waste acid used for pickling is mainly ferrous chloride solution, and the roasting process of acid regeneration is used to act on the ferrous chloride solution to cause a reverse reaction to generate hydrogen chloride gas, and the rinsing water produced by rinsing can be used for Absorb hydrogen chloride gas, and then produce a certain concentration of hydrochloric acid for repeated use ...

Claims

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Application Information

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IPC IPC(8): C23G1/36C23G1/08C23G3/00C23G3/02
CPCC23G1/36C23G1/08C23G3/00C23G3/021
Inventor 高国强田光杰张磊杨亮郝垚赵磊姚凯
Owner BEIJING SHOUGANG COLD ROLLED SHEET
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