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A method for separating and recovering acid and metal ions in iron and steel pickling waste liquid

A technology for iron and steel pickling waste liquid and metal ions, which is applied in chemical instruments and methods, metallurgical wastewater treatment, special treatment targets, etc., can solve the problems of high treatment cost and high equipment demand, and achieve high separation efficiency, fast separation efficiency, The effect of low equipment requirements

Active Publication Date: 2021-07-16
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Patent CN 109467239 A A method for recovering acid from iron and steel pickling waste liquid uses ultrafiltration membrane device, nanofiltration membrane device, electrodialysis, reverse osmosis and distillation device to treat iron and steel pickling waste liquid, and the concentration of hydrochloric acid recovered is 5%- 20%wt, this method requires high equipment and high processing costs

Method used

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  • A method for separating and recovering acid and metal ions in iron and steel pickling waste liquid
  • A method for separating and recovering acid and metal ions in iron and steel pickling waste liquid
  • A method for separating and recovering acid and metal ions in iron and steel pickling waste liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] (1) Preparation of chromatographic separation column: take 300mL of solid phase separation material and disperse it in 500mL of water, ultrasonically shake for 15min, the microscopic examination picture is as follows image 3 shown. The dispersed solid phase separation material is wet-packed. Put 300mL of solid phase separation material in the cartridge (DAC dynamic column DAC50), and fill up the remaining part with water to ensure that there are no air bubbles. The packing pressure is 2.5MPa. After the column is packed, wash it with 3BV pure water until there is no turbidity (holding pressure 2.5Mpa: the polymer ball has a 10% expansion rate).

[0077] Wherein, the solid phase separation material is quaternary amine (-N + (CH 3 ) 3 ) modified styrene-divinylbenzene copolymer particles (quaternary ammonium structure content of 15.12%). Particle size 85 microns, particle size difference ± 10 microns; specific surface area 800m 2 / g, pore diameter 50A, pore volume ...

Embodiment 2

[0083] (1) Preparation of chromatographic separation column: Disperse 300 mL of solid-phase separation material in 500 mL of water, and oscillate ultrasonically for 15 min. The dispersed solid phase separation material is wet-packed. Put 300mL of solid phase separation material in the cartridge (DAC dynamic column DAC50), and fill up the remaining part with water to ensure that there are no air bubbles. The packing pressure is 2.5MPa. After the column is packed, wash it with 3BV pure water until there is no turbidity (holding pressure 2.5Mpa: the polymer ball has a 10% expansion rate). Wherein, the solid phase separation material is styrene-divinylbenzene copolymer particles modified by quaternary ammonium (the content of quaternary ammonium structure is 12.76%). Particle size 35 microns, particle size difference +10 microns; specific surface area 800m 2 / g, pore diameter 50A, pore volume 1.2cm 3 / g.

[0084] (2) Loading the sample, take the iron and steel pickling waste ...

Embodiment 3

[0089](1) Preparation of chromatographic separation column: Disperse 300 mL of solid-phase separation material in 500 mL of water, and oscillate ultrasonically for 15 min. The dispersed solid phase separation material is wet-packed. Put 300mL of solid phase separation material in the cartridge (DAC dynamic column DAC50), and fill up the remaining part with water to ensure that there are no air bubbles. The packing pressure is 2.5MPa. After the column is packed, wash it with 3BV pure water until there is no turbidity (holding pressure 2.5Mpa: the polymer ball has a 10% expansion rate). The solid phase separation material is styrene-divinylbenzene copolymer particles modified by quaternary ammonium (the content of quaternary ammonium structure is 13.45%). Particle size 50 microns, particle size difference ± 10 microns; specific surface area 800m 2 / g, pore diameter 50A, pore volume 1.2cm 3 / g.

[0090] (2) Loading the sample, take the iron and steel pickling waste liquid (5...

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Abstract

The invention discloses a method for separating and recovering acid and metal ions in iron and steel pickling waste liquid, which comprises the following steps: (1) sample loading: loading the iron and steel pickling waste liquid containing ferrous ions In the chromatographic separation column of the material, the effluent is collected in three sections, which are respectively the effluent of the low-concentration recovery area, the effluent of the ferrous ion recovery area, and the effluent of the original concentrated recovery area; (2) Elution: elution with the eluent , and collect the eluent in three sections, which are respectively the eluent in the original concentrated recovery area, the eluent in the acid recovery area, and the eluent in the low concentration recovery area; (3) repeat the cycle step (1) and step (2) until solid The circulation is stopped when the phase separation material has no separation effect on acid and ferrous ions. Compared with the prior art, the technical process of the present invention is reasonable and controllable, the equipment requirement is low, the separation efficiency is high, the acid recovery rate is higher than 95%, and the metal ion recovery rate is higher than 98%. Acid recovery concentration c t / c 0 ≥80%, metal salt recovery concentration c t / c 0 ≥90%.

Description

technical field [0001] The invention belongs to the technical field of waste liquid resource treatment, and in particular relates to a method for separating and recovering acid and metal ions in iron and steel pickling waste liquid. Background technique [0002] my country's iron and steel enterprises use a large amount of sulfuric acid and hydrochloric acid in the production process. However, most of the sulfuric acid cannot be converted into products, and mainly exists in the form of waste acid. For low-concentration acid, it is generally considered to have no recovery value, and the neutralization method is normally used to remove acidity. Discharge or recycle with other harmful substances. However, for high-concentration acid (acid concentration higher than 5%), the main consideration is to use resource recovery to recover acid. [0003] In recent years, scholars at home and abroad have conducted a lot of research and exploration on the treatment of steel pickling waste ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C23G1/36C02F101/20C02F103/16
CPCC02F1/285C02F2101/20C02F2103/16C02F2303/16C23G1/36
Inventor 江伟任连兵魏士明李俊孙平黄升升张全兴
Owner NANJING UNIV
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