Method for recovering stainless steel acid 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 small footprint, intensive equipment, low operating energy consumption, etc. Effect

Active Publication Date: 2020-02-25
3R ENVIRONMENTAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] For the existing diffusion dialysis-electrodialysis technology to treat waste acid, it needs to be equipped with 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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  • Method for recovering stainless steel acid pickling waste sulfuric acid solution

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Embodiment 1

[0020] Reference attached figure 1 , the invention provides a kind of recycling method of stainless steel pickling waste sulfuric acid solution, specifically comprises the following steps:

[0021] 1, be 5.1% with sulfuric acid content, iron content is that 2.2% stainless steel pickling waste sulfuric acid a is filtered through the precision filter I of 1 micron order, obtains pretreatment liquid 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 feed condition enters the cycle reverse pulse power supply diffusion dialysis-electrodialyzer for acid and metal salts separation and recycling. Further description: the pretreatment liquid b enters the waste acid chamber II, tap water c enters the recovery acid chamber III, and the process parameters of the periodic reverse pulse power supply 4 are set to voltage 10V-15V, output pulse frequency 10Hz, positive and negative pulse wave number...

Embodiment 2

[0025] With sulfuric acid content of 5.1%, iron content of 2.2% stainless steel pickling waste sulfuric acid a as raw material; the volume ratio of pretreatment liquid b and tap water c is 1:1, the feed flow rate of pretreatment liquid b is 500L / h, cycle The output pulse frequency of the reverse pulse power supply 4 is 50 Hz, and other steps are the same as those in Embodiment 1. A recovered acid d with an acid content of 5.5%, a metal salt content of 0.05%, and a raffinate e with an acid content of 0.5% were finally 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 a raw material; the feed flow rate of the pretreatment liquid b is 300L / h, and the process parameters of the periodic reverse pulse power supply 4 are voltage 15V~20V, The output pulse wave frequency is 30Hz, and other steps are the same as those in Embodiment 1. Finally, a recovered acid d with an acid content of 29.8%, 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 recovering a stainless steel acid pickling waste sulfuric acid solution. The method includes steps: pretreating the waste sulfuric acid, and finely removing fine impurities by using a 1-micron-size filter to obtain a pretreated solution; (2) separating and recovering sulfuric acid and a metal salt solution from the pretreated solution by utilizing a periodic reverse pulsed power supply diffusion dialysis-electrodialyzer to obtain recovered acid and residual liquid, respectively; (3) returning the recovered acid to a production line of a workshop for reuse,and after adding a proper amount of sodium phosphate and an alkali agent into the residual liquid to remove heavy metal impurities such as chromium, oxidizing the residual liquid to prepare polyferricsulfate which is a water treatment agent. The periodic reverse pulsed power supply diffusion dialysis-electrodialyzer is utilized for efficient separation of acid from metal ions. The method is low in cost, resources can be fully recovered, and economic and environment protection benefits are good.

Description

technical field [0001] The invention relates to the technical field of waste liquid recovery and utilization, in particular to a method for recovery and utilization of stainless steel pickling waste sulfuric acid solution. Background technique [0002] During the production and processing of steel products, in order to make the surface of steel products smooth and free of rust, steel components need to use mineral acid to clean off the metal oxide layer on the surface. The acid solution after cleaning contains a lot of ferrous, chromium, nickel , manganese and other heavy metals to become waste acid, the state has included such waste sulfuric acid in the "National List of Hazardous Wastes". As a big country producing and processing stainless steel, in recent years, China's iron and steel enterprises produce nearly 10 million tons of pickling waste sulfuric acid every year. How to economically, efficiently and cleanly dispose of stainless steel pickling waste sulfuric acid i...

Claims

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Application Information

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Patent Type & Authority Applications(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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