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Method and system for purifying and recycling waste sulfuric acid

A technology of waste sulfuric acid and sulfuric acid, which is applied in chemical instruments and methods, sulfur compounds, sulfur trioxide/sulfuric acid, etc., and can solve the problems of waste sulfuric acid solution discharge pollution, etc.

Active Publication Date: 2021-05-14
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a waste sulfuric acid purification and reuse method and system, which are used to solve the pollution problem of waste sulfuric acid solution discharge and improve the utilization rate of sulfuric acid and non-ferrous metal resources

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  • Method and system for purifying and recycling waste sulfuric acid
  • Method and system for purifying and recycling waste sulfuric acid
  • Method and system for purifying and recycling waste sulfuric acid

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Embodiment 1

[0047] In this embodiment, the waste sulfuric acid solution contains 2.7% sulfuric acid, 5.9% copper ions, and 2.1% sodium ions, and is a waste sulfuric acid solution for metal smelting. Among them, ultrafiltration adopts a ceramic ultrafiltration membrane with a filter pore size of 10 nm. The acid-resistant nanofiltration membrane is used in the nanofiltration separation, and the nanofiltration filtrate tube is chlorinated polyvinyl chloride. The cation exchange membrane in the acid separation electrodialysis treatment adopts the acid separation selective ion exchange membrane, the selective permeability is 98.5%, and the membrane resistance is 2.5Ω·cm 2 , the current density is 400A / m 2 ; In the acid concentration electrodialysis treatment, a special acid concentration homogeneous ion exchange membrane is used, with a selective transmission rate of 98% and a membrane resistance of 1.5Ω·cm 2 , the current density is 500A / m 2 ; After the above treatment, 18.9% purified sulf...

Embodiment 2

[0049] In this embodiment, the waste sulfuric acid solution contains 4.3% sulfuric acid, 6.8% nickel ions, and 3.5% sodium ions, which is the waste sulfuric acid solution for metal smelting. Among them, ultrafiltration adopts a ceramic ultrafiltration membrane with a filter pore size of 50 nm. The acid-resistant nanofiltration membrane is used in the nanofiltration separation, and the nanofiltration filtrate tube is chlorinated polyvinyl chloride; the cation exchange membrane in the acid separation electrodialysis treatment adopts an acid separation selective ion exchange membrane, the selective transmission rate is 97%, and the membrane resistance is 4.5Ω·cm 2 , the current density is 250A / m 2 ; In the acid concentration electrodialysis treatment, a special acid concentration homogeneous ion exchange membrane is used, with a selective permeability of 98% and a membrane resistance of 3 Ω·cm 2 , with a current density of 320 A / m 2 ; After the above treatment, 22.7% of purifi...

Embodiment 3

[0051] In this embodiment, the waste sulfuric acid solution contains 5.5% sulfuric acid, 3.6% cobalt ions, and 2.9% sodium ions, which is the waste sulfuric acid solution for metal smelting. Among them, the ceramic ultrafiltration membrane with a filter aperture of 20nm is used for ultrafiltration; acid-resistant nanofiltration membrane is used in nanofiltration separation, and the nanofiltration filtrate tube is chlorinated polyvinyl chloride; the cation exchange membrane in acid separation electrodialysis treatment uses acid to separate selective ions Exchange membrane with a selective transmittance of 96.5% and a membrane resistance of 3Ω·cm 2 , the current density is 350A / m 2 ; In the acid concentration electrodialysis treatment, a special acid concentration homogeneous ion exchange membrane is used, with a selective transmission rate of 98.5% and a membrane resistance of 2 Ω·cm 2 , the current density is 450A / m 2 ; After the above treatment, 20.6% purified sulfuric acid...

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Abstract

The invention relates to a method for purifying and recycling waste sulfuric acid. The method comprises the following steps: S1, carrying out nanofiltration separation on a waste sulfuric acid solution subjected to insoluble substance impurity removal treatment to generate a nanofiltration concentrated solution and a nanofiltration filtrate; S2, carrying out acid separation electrodialysis treatment on the nanofiltration filtrate, obtaining a purified sulfuric acid solution in a concentrated liquid chamber of an acid separation electrodialyzer, and obtaining a sodium salt solution containing a small amount of acid in a thin liquid chamber of the acid separation electrodialyzer; S3, carrying out acid concentration electrodialysis treatment on the purified sulfuric acid solution to obtain purified high-concentration sulfuric acid in a concentrated liquid chamber of an acid concentration electrodialyzer and obtain low-concentration sulfuric acid in a thin liquid chamber of the acid concentration electrodialyzer, wherein the nanofiltration concentrated solution can be used for recovering nonferrous metals, and the acid-containing sodium salt obtained by the acid-separating electrodialysis can be used as an acid-separating electrodialyzer polar solution or used for cleaning an ultrafiltration / nanofiltration device. The method effectively solves the problem of waste sulfuric acid solution discharge pollution, improves the utilization rate of sulfuric acid and nonferrous metal resources, and has the characteristics of high impurity removal rate, low treatment cost, simple operation, stable operation, safety and environmental protection.

Description

technical field [0001] The invention relates to the technical field of recycling waste acid, in particular to a method and system for purifying and recycling waste sulfuric acid. Background technique [0002] In the production process of the metal smelting industry, a large amount of sulfuric acid is required for concentrate leaching, surface cleaning, electrolytic deposition, etc., so a large amount of waste sulfuric acid solution containing metal ions will be produced. If the waste sulfuric acid is not treated and discharged directly, it will not only affect The natural environment causes great harm, and wastes sulfuric acid and non-ferrous metal resources. Therefore, it is of great significance to the green and clean production of my country's industry to develop efficient, energy-saving and environmentally friendly waste sulfuric acid treatment technology and improve the recycling rate of waste sulfuric acid. [0003] At present, most of the waste sulfuric acid solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90C22B3/08
CPCC01B17/902C22B3/08Y02P10/20
Inventor 祝海涛吴雅琴杨波张新
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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