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Recovery method and device for hydrochloric acid in industrial waste liquid

A technology of industrial waste liquid and recovery method, applied in chlorine/hydrogen chloride purification, chlorine/hydrogen chloride and other directions, can solve the problems of containing other impurities, unsuitable for popularization and application, inconvenient operation, etc., and achieves simple equipment, simple structure, and equipment. simple effect

Inactive Publication Date: 2017-08-11
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the investment of this method is still high, and the operation is inconvenient, so it is not suitable for extensive promotion and application.
[0010] Generally, the amount of hydrochloric acid contained in industrial waste liquid is relatively low, less than 10%, and also contains other impurities. It is not suitable for small and medium-sized industrial enterprises to directly use high-tech equipment to recycle it.

Method used

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  • Recovery method and device for hydrochloric acid in industrial waste liquid
  • Recovery method and device for hydrochloric acid in industrial waste liquid
  • Recovery method and device for hydrochloric acid in industrial waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Use the following devices to recover hydrochloric acid in industrial waste liquid, such as figure 1 As shown, the recovery unit includes: a reboiler, a rectification tower, a feed system and a condensation system.

[0043] The reboiler includes a container portion 11 and a heating device 12 for heating the container portion. A discharge port 111 controlled by a discharge valve is provided at the bottom of the container part 11 of the reboiler.

[0044] The rectification tower above includes a first rectification column 21 and a second rectification column 22 connected in sequence. In this embodiment, the lengths of the first rectification column 21 and the second rectification column 22 are both 70 cm. The inner diameter is 20mm. The first rectification column 21 is connected to the container part 11 of the reboiler.

[0045] Above-mentioned feed system comprises feed kettle 31, feed pipe 32, for the liquid addition device 33 of feed kettle liquid addition and the he...

Embodiment 2

[0071] The recovery method of hydrochloric acid in a kind of industrial waste liquid of this embodiment is basically the same as the recovery method in Example 1, the difference is:

[0072] 1. Measure the content of hydrochloric acid in the industrial waste liquid, and distill the industrial waste liquid to obtain 1300ml of 21.455% HCl solution as the feed still liquid.

[0073] 2. Heating the feed kettle liquid to generate feed steam, which is introduced from the middle of the rectification tower, fed in the form of steam, and rectified.

[0074] 1300 ml of 18.156% HCl solution was added to the vessel portion of the reboiler as the reboiler pot liquid.

[0075] 3. Continuous distillation process.

[0076] During the continuous distillation process, the liquid addition rate was 4.55ml / min, and the reflux ratio was controlled to be 2:3.

[0077] Fourth, collect the recovered high-purity hydrochloric acid solution.

[0078] Adopt ion chromatography to measure upper kettle li...

Embodiment 3

[0083] The recovery method of hydrochloric acid in a kind of industrial waste liquid of this embodiment is basically the same as the recovery method in Example 1, the difference is:

[0084] 1. Measure the content of hydrochloric acid in the industrial waste liquid, and distill the industrial waste liquid to obtain 1300ml of 21.184% HCl solution as the feed still liquid.

[0085] 2. Heating the feed kettle liquid to generate feed steam, which is introduced from the middle of the rectification tower, fed in the form of steam, and rectified.

[0086] 1300 ml of 18.500% HCl solution was added to the vessel portion of the reboiler as reboiler pot liquor.

[0087] 3. Continuous distillation process.

[0088] During the continuous distillation process, the liquid addition rate was 4.5ml / min, and the reflux ratio was controlled to be 3:5.

[0089] Four, collect the recovered pure hydrochloric acid solution.

[0090]Every 30 minutes adopt ion chromatography to measure the upper ket...

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Abstract

The invention relates to a recovery method and device for hydrochloric acid in industrial waste liquid, and belongs to the technical field of recovery and treatment of industrial waste water. The recovery method comprises the following steps: 1) measuring the content of hydrochloric acid in the industrial waste liquid, and distilling the industrial waste liquid so that the content of hydrochloric acid in it reaches a predetermined value to obtain the feed tank liquid; 2) heating the feed feed tank liquid to Continuously produce the feed steam with the same concentration of hydrochloric acid in the industrial waste liquid, import the feed steam from the middle of the rectification tower, feed it in the form of steam, and carry out rectification; 3) The gas in the rectification tower is in the rectification After being condensed into liquid in the condensing system at the top of the tower, part of it is discharged from the upper liquid outlet of the condensing system, and the other part is refluxed from the top of the rectifying tower to the rectifying tower, and the heating temperature of the reboiler is controlled to keep the liquid in it boiling state; 4) collect the high-purity hydrochloric acid solution from the reboiler. The method can recover hydrochloric acid with simple equipment and low cost from industrial waste liquid with low hydrochloric acid content.

Description

technical field [0001] The invention relates to the technical field of recovery and treatment of industrial waste water, in particular to a recovery method and device for hydrochloric acid in industrial waste liquid. Background technique [0002] Hydrochloric acid is a commonly used chemical raw material, which is widely used in the pickling production of steel, electroplating and steel structural parts. At the same time, it is also used in the production process of chemical industry and rare earth. A push-pull pickling unit with an annual output of 450,000 tons of cold-rolled steel plates requires about 20,000 tons of hydrochloric acid per year, and produces nearly 20,000 tons of hydrochloric acid-containing waste liquid (about 5% hydrochloric acid, 10.12% ferrous chloride) per year . In chemical production, such as dyes and pesticides, the hydrochloric acid wastewater produced every year cannot be counted. [0003] my country is a large country with rare earth resource ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/07
Inventor 郑育英杜涵姬文晋李军窦正杰黄文涛
Owner GUANGDONG UNIV OF TECH