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
CN104512865BActive Publication Date: 2016-08-17BAOSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BAOSHAN IRON & STEEL CO LTD
Publication Date
2016-08-17

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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.
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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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