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Electrolytic apparatus for regenerating waste acid produced by acid cleaning of stainless steel, regeneration method therefor

An electrolysis device, stainless steel technology, applied in the field of electrolysis devices for the regeneration of waste acid after pickling of stainless steel, can solve the problems of unclear application prospects, secondary pollution, environmental pollution, etc., and achieve improved sample processing speed and efficiency, convenient disassembly, Effects of Overcoming Limitations

Inactive Publication Date: 2010-12-29
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, these two treatment methods will cause serious pollution to the environment or cause serious waste of resources.
The literature "Review of the recovery process of cold-rolled stainless steel pickling waste acid roasting method" ("Baosteel Technology" supplementary publication in 2003) pointed out that the use of roasting method to treat waste acid is mature, but the process produces a lot of harmful gases and requires large-scale gas absorption. Equipment, there is secondary pollution, so the application prospect is not clear

Method used

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  • Electrolytic apparatus for regenerating waste acid produced by acid cleaning of stainless steel, regeneration method therefor
  • Electrolytic apparatus for regenerating waste acid produced by acid cleaning of stainless steel, regeneration method therefor
  • Electrolytic apparatus for regenerating waste acid produced by acid cleaning of stainless steel, regeneration method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Spent acid regeneration electrolysis device

[0025] Waste acid electrolysis treatment device such as figure 1 As shown, the power supply 1 is a multiple input and output constant voltage power supply. The negative output terminal 2 of the power supply is connected to the cathode input terminal 4 of the electrolytic cell by a wire 3, and is connected to the cathode electrode 10 of the electrolytic cell. The electrode is cylindrical and enlarged. The electrolysis reaction area, the electrolytic cell 6 is a sealed cup-shaped container, with sample inlet 7 and sample outlet 8 at both ends, which is convenient for sample entry and product output. The anode electrode 5 is in the shape of a wire or sheet, and is connected to the anode of the electrolytic cell. The access terminal 11 is connected, and the entire flow path is finally connected to the positive output terminal 13 of the power supply through a wire 12. Add the waste acid 9 after stainless steel pickling in ...

Embodiment 2

[0027] (1) such as Figure 4 As shown, a single columnar graphite cathode and filamentary platinum anode are used. The electrolyte is a waste acid solution A after pickling in a large stainless steel plant in my country. The main ion concentrations are respectively: iron ion concentration 62g / L, nickel ion concentration 1.5g / L , The chromium ion concentration is 4g / L, the fluoride ion concentration is 1.5mol / L, electrolyzed at a constant voltage of 3.5V for 15 hours to obtain solution A1;

[0028] (2) Pass the solution A1 through a flame atomic absorption instrument, and use the flame method or the graphite furnace method to measure the content of metal ions such as Fe, Ni, and Cr; use a fluoride ion selective electrode to measure the fluoride ion content in it, and calculate the electrolytic ion removal efficiency.

Embodiment 3

[0030] (1) Weigh 10g of anhydrous sodium sulfate, dissolve it with water and dilute it to 200mL to obtain catalyst S;

[0031] (2) such as Figure 4 As shown, using a single columnar graphite cathode and a filamentary platinum anode, the spent acid solution A is electrolyzed at a constant voltage of 3.5V, catalyst S is added, and the electrolysis time is 15 hours to obtain solution A2;

[0032] Step 3 is the same as step (2) in Example 2 to calculate the electrolytic metal ion removal efficiency.

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Abstract

The invention provides an electrolytic device for the waste acid regeneration after the acid etching of the stainless steel and a regeneration method, which belong to the technical field of the electrolysis process application. The electrolytic device is composed of a constant voltage and constant current power supply controlled by a computer and a plurality of electrolytic baths which are filledwith waste acid after the acid etching of the stainless steel to be used as electrolyte solution, a plurality of electrodes are arranged in the electrolytic baths, a plurality of input / output constant voltage and constant current power supplies are used, a plurality of cathode electrodes and a plurality of anode electrodes in the electrolytic baths are connected in parallel or in series, the plurality of electrolytic baths are connected in series, the electrolysis is performed under the constant voltage of 3.5 V, the hydroxyl in the solution is reduced in an electrolysis way, to ensure the concentration of hydrogen ions in the solution to be increased, and simultaneously the electrolytic reduction of fluorions and nitrate ions in the solution to be avoided, thereby causing the waste acid regeneration. The electrolytic device can be used flexibly according to the physical circumstances, is easy to be cleaned, maintained and adjusted, and has wide applicability to the waste acid processing.

Description

Technical field: [0001] The invention belongs to the technical field of electrolysis process application, and specifically relates to an electrolysis device and a regeneration method for regenerating waste acid after stainless steel pickling. Background technique: [0002] At present, the method of processing stainless steel pickling waste at home and abroad is the chemical method, that is, the method of acid and alkali neutralization is used to make fluoride ions form a certain insoluble salt to precipitate, and the treated solution is directly discharged; or the vacuum distillation method is used. The fluoride ion and nitrate ion in the waste acid are distilled out in the form of hydrogen fluoride and nitrogen dioxide by adding concentrated sulfuric acid, and then absorbed by the absorption tank. Obviously, these two treatment methods will cause serious pollution to the environment or cause serious waste of resources. The literature "Review on the recovery process of cold-roll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/36
Inventor 陈同云张王兵
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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