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New process for recycling pickling waste liquid

A technology of pickling waste liquid and pickling, which is applied in the fields of metallurgical wastewater treatment, iron halide, chemical instruments and methods, etc., can solve the problems of corrosion, poor operating environment, and large consumption of alkali

Inactive Publication Date: 2010-11-24
BEIJING ZIGUANG YINGLI CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high acid and salt content of the pickling waste liquid, it cannot be discharged directly. If it is neutralized and discharged, it will consume a lot of alkali and produce a large amount of high-concentration saline waste water; if it is concentrated or roasted to recover hydrochloric acid, there will be energy consumption. High, large equipment investment, serious corrosion, poor operating environment and other issues

Method used

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  • New process for recycling pickling waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take 40ml of the pickling waste liquid from the pickling section of the steel plant (the pickling waste liquid is taken from a steel plant, and the appearance is a yellow-green clear liquid with a sour taste, [H + ]=9.8mol / L, the total iron content is 154.9g / L, the content of divalent iron ion is 149.1g / L, the acidity of HCl is 12.07%) is added to the three-necked flask to be reacted. Inject continuously stable HCl gas into the pickling waste liquid. The other mouth of the three-necked bottle is connected to a buffer bottle to prevent back suction. After the buffer bottle, use the pickling waste liquid for circular absorption.

[0013] In order to prevent the reaction from being too rapid, HCl gas was introduced slowly and stably while stirring the waste pickling liquid for full absorption. Depending on the aeration rate, about 20 to 60 minutes, yellow-green crystals were continuously precipitated in the waste pickling liquid. HCl gas is continuously fed in and cooled to 1...

Embodiment 2

[0016] Take 40ml of the pickling waste liquid from the pickling section of the steel plant (the pickling waste liquid is taken from a steel plant, and the appearance is a yellow-green clear liquid with a sour taste, [H + ]=9.8mol / L, total iron content is 154.9g / L, of which ferric ion content is 149.1g / L, HCl acidity is 12.07%) added to a three-necked flask for reaction. Inject continuously stable HCl gas into the pickling waste liquid. The other mouth of the three-necked bottle is connected to a buffer bottle to prevent back suction. After the buffer bottle, use the pickling waste liquid for circular absorption.

[0017] In order to prevent the reaction from being too rapid, HCl gas was introduced slowly and stably while stirring the waste pickling liquid for full absorption. Depending on the aeration rate, about 20 to 60 minutes, yellow-green crystals were continuously precipitated in the waste pickling liquid. HCl gas is continuously introduced and cooled to 15°C. Most of the i...

Embodiment 3

[0020] Take 40ml of the pickling waste liquid from the pickling section of the steel plant (the pickling waste liquid is taken from a steel plant, and the appearance is a yellow-green clear liquid with a sour taste, [H + ]=9.8mol / L, total iron content is 154.9g / L, of which ferric ion content is 149.1g / L, HCl acidity is 12.07%) added to a three-necked flask for reaction. Inject continuously stable HCl gas into the pickling waste liquid. The other mouth of the three-necked bottle is connected to a buffer bottle to prevent back suction. After the buffer bottle, use the pickling waste liquid for circular absorption.

[0021] In order to prevent the reaction from being too rapid, HCl gas was introduced slowly and stably while stirring the waste pickling liquid for full absorption. Depending on the aeration rate, about 20 to 60 minutes, yellow-green crystals were continuously precipitated in the waste pickling liquid. HCl gas is continuously fed in and cooled to 15°C. Most of the iron ...

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Abstract

The invention provides a convenient processing scheme for recycling a pickling waste liquid, which well solves the problems of high processing cost, resource waste and recontamination in the conventional method. Based on the common-ion effect of Cl<-> in an aqueous solution, HCl gas is introduced to separate out most of FeCl2; and the produced filtrate is hydrochloric acid liquid which is directly recycled to a pickling bay in a steel mill. The process has better economic benefits and social environmental benefits, and meets the requirements for clean production, circular economy, energy saving and consumption reduction.

Description

Technical field [0001] The invention relates to a new process for recycling the waste pickling liquid by directly passing HCl gas into the waste pickling solution to precipitate ferrous chloride, and using the filtrate as the pickling acid directly back into the pickling waste liquid in the pickling section. Solid ferrous chloride is sold directly or further synthesized into products such as polyferric chloride. Background technique [0002] In the steel processing industry, hydrochloric acid is often needed to clean the surface of steel parts to remove rust on the surface. During the pickling process, hydrochloric acid is continuously consumed, and at the same time, the divalent iron ions in it continue to increase with the consumption of hydrochloric acid until the hydrochloric acid lotion no longer has a cleaning effect on the steel, and the washing waste generated at this time is It is pickling waste liquid. The composition of waste pickling acid is mainly water, ferrous ch...

Claims

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Application Information

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IPC IPC(8): C01G49/10C02F1/64C02F103/16
Inventor 田莹莹尹应武廖翠莺
Owner BEIJING ZIGUANG YINGLI CHEM TECH CO LTD
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