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

CN110835150BActive Publication Date: 2022-03-293R ENVIRONMENTAL TECH CO LTD

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: 3R ENVIRONMENTAL TECH CO LTD
Publication Date: 2022-03-29

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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.

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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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