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Strip steel surface descaling method and system

A descaling system and strip steel technology, applied in the metallurgical industry, can solve the problems of high cost and many pickling processes, and achieve the effects of reducing hardening, low projection speed and reducing acid mist volatilization

Pending Publication Date: 2019-05-28
CISDI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method and system for descaling the steel strip surface, which is used to solve the problem of many pickling processes and high cost in the prior art

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  • Strip steel surface descaling method and system
  • Strip steel surface descaling method and system
  • Strip steel surface descaling method and system

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Embodiment Construction

[0047] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0048] see Figure 1 to Figure 3 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of ​​the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arb...

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Abstract

The invention provides a strip steel surface descaling method and system. The strip steel surface descaling method comprises the steps of carrying out scale breaking treatment, carrying out descalingtreatment, carrying out first drying treatment and carrying out acid pickling treatment, wherein an adopted descaling medium is mortar formed by mixing abrasive materials and water, an adopted acid pickling solution is a mixed solution of nitric acid with the concentration of 20-200 g / L and hydrofluoric acid with the concentration of 0.5-50 g / L, the temperature of the acid pickling solution is 40-65 DEG C, and the acid pickling time is 20-60 S. The strip steel surface descaling system is sequentially provided with a scale breaking machine for scale breaking treatment, a shot blasting machine used for descaling treatment, a first drying unit used for first drying treatment and an acid tank used for acid pickling in the movement direction of strip steel. The strip steel surface descaling method and system have the advantages that acid pickling of sulfuric acid is not needed, the concentration of the nitric acid and the hydrofluoric acid in the acid pickling solution can be decreased, theacid pickling time of the nitric acid and the hydrofluoric acid in the acid pickling solution can be shortened, and therefore the generation of pollutants such as waste acid and waste gas is reduced,the descaling efficiency is improved, and the equipment investment and the operation and maintenance cost are lowered.

Description

technical field [0001] The invention relates to the field of metallurgical industry, in particular to a strip steel surface descaling method and system. Background technique [0002] During the hot rolling process of strip steel, a dense oxide layer will be formed on the surface. This layer of oxide layer is usually called "scale", which needs to be descaled before strip rolling. The currently used descaling processes are: annealing, descaling, dry shot blasting, sulfuric acid pickling, rinsing, mixed acid pickling (HNO 3 +HF), rinse and dry. Dry shot blasting descaling will cause surface hardening of the strip steel, and at the same time, dust pollution will be generated during the dry shot blasting descaling process, which will affect the surface quality of the strip steel; due to the insufficient ability of dry shot blasting descaling to remove the oxide layer , Sulfuric acid pickling is needed to further remove the oxide scale before it can enter the mixed acid acid ta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24C1/08C23G1/08C23G3/02
Inventor 刘玉堂夏强强
Owner CISDI RES & DEV CO LTD
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