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A kind of recycling method of stainless steel pickling waste sulfuric acid solution

A technology of waste sulfuric acid and stainless steel, applied in separation methods, chemical instruments and methods, metallurgical wastewater treatment, etc., can solve the problems of high equipment cost investment, large equipment footprint, and low energy consumption in operation, so as to save treatment costs, The effect of small footprint and high acid recovery rate

Active Publication Date: 2022-03-29
3R ENVIRONMENTAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] In view of the existing diffusion dialysis-electrodialysis technology, when treating waste acid, it is necessary to configure a diffusion dialysis device and an electrodialysis device at the same time, and it needs to be treated in two steps (diffusion dialysis treatment first, and then electrodialysis treatment), which leads to high equipment cost and equipment cost. The object of the present invention is to provide a recycling method for stainless steel pickling waste sulfuric acid solution. The technical method for processing stainless steel pickling waste acid has the advantages of high acid recovery rate, high purity of recovered acid, and intensive equipment. , Small footprint and low energy consumption

Method used

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  • A kind of recycling method of stainless steel pickling waste sulfuric acid solution

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Embodiment 1

[0020] Reference attached figure 1 , The present invention provides a method for recycling stainless steel pickling waste sulfuric acid solution, which specifically includes the following steps:

[0021] 1. The sulfuric acid content is 5.1% and the iron content is 2.2%. The stainless steel pickling waste sulfuric acid a is filtered through a 1-micron-level precision filter I to obtain a pretreatment solution b.

[0022] 2. The volume ratio of pretreatment liquid b and tap water c is 1:0.7, and the feed flow rate of pretreatment liquid b is 400L / h. The feeding conditions enter into the periodic reverse pulse power diffusion dialysis-electrodialyzer for acid and metal salts. separation and recycling. Further description: the pretreatment liquid b enters the waste acid chamber II, the tap water c enters the recovery acid chamber III, and the process parameters of the periodic reverse pulse power supply 4 are set as voltage 10V~15V, output pulse frequency 10Hz, positive and negat...

Embodiment 2

[0025] The sulfuric acid content is 5.1% and the iron content is 2.2% stainless steel pickling waste sulfuric acid a as the raw material; the volume ratio of the pretreatment solution b and the tap water c is 1:1, the feed flow rate of the pretreatment solution b is 500L / h, and the cycle The output pulse frequency of the reverse pulse power supply 4 is 50 Hz, and other steps are the same as those in the first embodiment of the specific implementation. Finally, a recovered acid d with an acid content of 5.5% and a metal salt content of 0.05% and a raffinate e with an acid content of 0.5% were obtained.

Embodiment 3

[0027] The stainless steel pickling waste sulfuric acid a with a sulfuric acid content of 24.8% and an iron content of 2.0% is used as the raw material; the feed flow rate of the pretreatment solution b is 300L / h, and the process parameters of the periodic reverse pulse power supply 4 are the voltage of 15V ~ 20V, The frequency of the output pulse wave is 30 Hz, and other steps are the same as those in Embodiment 1 of the specific embodiment. Finally, a recovered acid d with an acid content of 29.8% and a metal salt content of 0.11% and a raffinate e with an acid content of 0.5% were obtained.

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Abstract

The invention discloses a method for recycling stainless steel pickling waste sulfuric acid solution, which specifically comprises the following steps: (1) pretreating stainless steel pickling waste sulfuric acid, and using a filter of 1 micron level to fine filter to remove fine particle impurities to obtain the pretreated treatment fluid. (2) Separation and recovery of sulfuric acid and metal salt solution are performed on the pretreatment solution with periodic reverse pulse power supply diffusion dialysis-electrodialyzer to obtain recovered acid and raffinate respectively. (3) Recover the acid and return it to the production line of the workshop for reuse; add appropriate amount of sodium phosphate and alkaline agent to the raffinate to remove heavy metal impurities such as chromium, and then oxidize to prepare the water treatment agent polyferric sulfate. The method of the invention utilizes a periodic reverse pulse power supply diffusion dialysis-electrodialyzer to realize high-efficiency separation of acid and metal ions. The technical method has low operating costs, fully recycles resources, and has good economic and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of waste liquid recycling, in particular to a recycling method for stainless steel pickling waste sulfuric acid solution. Background technique [0002] In the production and processing of steel products, in order to make the surface of steel products smooth and free of rust, the steel components need to be cleaned with mineral acid to remove the metal oxide layer on the surface. The acid solution after cleaning contains a large amount of ferrous, chromium, nickel , manganese and other heavy metals into waste acid, the state has included such waste sulfuric acid in the "National List of Hazardous Wastes". As a big country in the production and processing of stainless steel, in recent years, Chinese steel enterprises have produced nearly 10 million tons of acid-washing waste sulfuric acid every year. How to treat stainless steel pickling waste sulfuric acid economically, efficiently and cleanly is of great si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469C02F103/16C02F101/22C02F101/20
CPCC02F1/4693C02F2101/203C02F2101/22C02F2103/16
Inventor 梁余威樊文星张谊彬曾慧吴少聪
Owner 3R ENVIRONMENTAL TECH CO LTD
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