Method for controlling the addition amount of neutralizing agent ammonia in silicon removal neutralization reaction

A control method and technology of addition amount, applied in the field of metallurgy to achieve the effect of high degree of automation

Active Publication Date: 2016-08-17
BAOSHAN IRON & STEEL CO LTD
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  • Claims
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Problems solved by technology

The technical solution is to divide the existing reaction tank into four functional areas according to the different stages of the silicon removal and neutralization reaction, so as to minimize the interference factors in each reaction stage, but the technical solution is still based on the fixed addition ratio. Feeding compared to waste acid

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  • Method for controlling the addition amount of neutralizing agent ammonia in silicon removal neutralization reaction
  • Method for controlling the addition amount of neutralizing agent ammonia in silicon removal neutralization reaction
  • Method for controlling the addition amount of neutralizing agent ammonia in silicon removal neutralization reaction

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Embodiment Construction

[0023] The method for controlling the amount of neutralizing agent ammonia added in the silicon removal and neutralization reaction described in the present invention will be further explained below in conjunction with specific embodiments, but the explanation does not constitute an improper limitation to the technical solution of the present invention.

[0024] The inventors used the chemical titration method to measure the change relationship between the amount of ammonia water added and the pH value of the solution, so as to verify whether the pH value can accurately reflect the process and effect of the silicon removal and neutralization reaction. At room temperature, add a certain amount of ammonia water dropwise to the waste acid solution, and stir while adding dropwise, the pH value of the obtained solution varies with the amount of ammonia water added as follows: figure 1 shown.

[0025] From figure 1 It can be seen that when the ammonia water is just added to the pic...

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Abstract

The invention discloses a method for controlling the addition amount of ammonia water (neutralizing agent) in a silicon-moving neutralization reaction. The method comprises the following steps: according to the relationship between a waste acid pH value (pH2) after a silicon-moving neutralization reaction and a target pH value (pH target) of the silicon-moving neutralization reaction, carrying out feedback control of the addition amount of ammonia water (neutralizing agent): when pH2<=pH target, the addition amount (Y) of ammonia water is accord with a formula (shown in the description); when pH2>pH target, the addition amount (Y) of ammonia water is according with a formula (shown in the description). The provided control method can precisely control the addition amount of neutralizing agent to waste acid, thus the yield of Fe(OH)3 precipitation can be precisely controlled, the silicon-removing efficiency is guaranteed, the iron loss is maximally reduced, and the output of iron oxide red is increased.

Description

technical field [0001] The invention relates to a pickling technology in the field of metallurgy, in particular to a control method for removing silicon from waste acid. Background technique [0002] For the cold-rolled pickling unit that uses hydrochloric acid as the pickling agent, the waste liquid after pickling will be collected and recycled after acid treatment. During this process, the iron in the pickling waste liquid will be roasted into iron oxide red, which is a high-quality soft magnetic material. In order to improve the quality of iron oxide red in the pickling waste liquid, it is necessary to purify the pickling waste liquid, especially to remove impurities such as silicon and aluminum in the waste acid liquid. In simple terms, the desiliconization reaction step is to make the Fe in the waste liquid 3+ reduced to Fe 2+ , and then add ammonia water to adjust the pH value, so that the Fe in the solution 2+ Generate Fe(OH) 2 , and then into the air to Fe(OH) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/07C02F1/66
CPCC01B7/0706C02F1/66C02F2209/005C02F2209/06
Inventor 宋俊杨建林朱大刚王彦杰
Owner BAOSHAN IRON & STEEL CO LTD
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