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A rapid control method for anti-crystallization regeneration of cold-rolled steel pickling waste acid

A rapid control and anti-crystallization technology, which is applied in the field of metallurgy, can solve the problems of unable to discover, prevent and control, judge and prevent the crystallization of waste acid crystallization, and the prevention of crystallization of waste acid is not strong. Effect of preventing waste acid crystallization and solving waste acid crystallization

Inactive Publication Date: 2017-03-01
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method takes a long time from sampling to testing and to the feedback of results, which is relatively lagging behind in judging and preventing pipeline crystallization, and cannot detect and prevent waste acid crystallization in the first time. prevention is not strong

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The purpose of preventing waste acid crystallization is achieved by combining the following four aspects:

[0020] (1) For the filter before waste acid concentration, the filter mesh used is 2 mesh in diameter, made of PTFE (polytetrafluoroethylene), and the pressure difference between the front and back of the filter is ≤1.5Kg / cm 2 (1.5×10 5 Pa), when the pressure difference between the front and back of the filter is greater than 1.5Kg / cm 2 (1.5×10 5 Pa), it is necessary to start the switching and cleaning program, switch or clean the filter screen;

[0021] (2) Control the density of waste acid after concentration to 1.3-1.5g / cm 3 ; Specific operation: Take the waste acid, insert it directly into the density meter, and judge whether it is necessary to adjust the concentration of the waste acid according to the density value read, and the density is lower than 1.3g / cm 3 , can continue to concentrate the waste acid; the density is higher than 1.5g / cm 3 , you can a...

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PUM

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Abstract

The invention discloses a rapid control method for preventing regenerated waste cold rolled steel pickling acid from crystallization. The rapid control method comprises the following four aspects to achieve the purpose of preventing waste acid from crystallization: (1) a filtering net with the aperture of 2 meshes is adopted as a filter used before the waste acid is concentrated, the filtering net is made of PTFE, and the pressure difference of the filter before and after filtration is less than or equal to 1.5Kg / cm<2>; (2) the density of the concentrated waste acid is controlled to be 1.3-1.5g / cm<3>; (3) the temperature of the concentrated waste acid inside a pipeline is controlled to be reduced by less than or equal to 20 DEG C / hour; (4) the flow of the concentrated waste acid inside the pipeline is controlled to be no less than 50% of designed flow. Viewing from analyzing the waste acid crystallization mechanism, four main factors of crystallization are found, and an effect of preventing crystallization is achieved by optimizing the four factors. The rapid control method has the advantages that firstly, the mass of the waste acid can be rapidly judged, the waste acid can be prevented from crystallization, and the problem of waste acid crystallization can be solved; secondly, the faults of an acid regeneration system can be reduced; thirdly, the labor and material consumption of stations can be reduced.

Description

technical field [0001] The invention relates to a rapid control method for anti-crystallization regeneration of cold-rolled steel pickling waste acid, which belongs to the technical field of metallurgy. Background technique [0002] Before cold rolling, the thin steel plate needs to be pickled with hydrochloric acid to remove the iron oxide scale on the surface of the raw steel coil that is harmful to cold rolling. During the pickling process, Fe 2+ The concentration of the pickling solution will gradually increase, and when it reaches 110-130g / L, the pickling solution will be discharged as waste solution. At present, waste acid regeneration is mainly carried out by means of spray roasting. The specific process is as follows: the waste acid from the pickling line is pumped to the filter, filtered to remove solid particles and insoluble matter, and then enters the concentrator for heating and concentration (with The hot roasting gas is heated by heat exchange) to evaporate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/36
CPCC23G1/36
Inventor 董凯张永宽闫丽薇邹玉萍胡国雄王乐秦甲卫汤安民钟亮刘振方
Owner SHANDONG IRON & STEEL CO LTD
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