Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Process for recovering heavy metallic salt and inorganic acid in pickling waste liquid

A heavy metal salt and acid recovery technology, applied in chemical instruments and methods, semi-permeable membrane separation, permeation/dialysis water/sewage treatment, etc., can solve incomplete resource recycling, reduce membrane service life, increase treatment costs, etc. problem, to achieve the effect of increasing the economic effect of the enterprise, increasing the processing cost, and reducing energy consumption

Active Publication Date: 2012-07-25
NANJING TECH UNIV +1
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of this method are: resource recycling is incomplete, the dialysate in the diffusion dialysis and the concentrated solution in the nanofiltration process are not treated so that the metal salt cannot be recovered; the acid is concentrated by nanofiltration and reverse osmosis, which is relatively difficult A high concentration of acid will greatly reduce the service life of the membrane and increase the treatment cost; if the pickling waste liquid is a mixed acid system, the use of the purified and concentrated acid will be greatly limited, and its applicability will be greatly restricted. limit
[0006] To sum up, there is currently a lack of a process for the comprehensive treatment of metal waste acid solution, which can achieve the purpose of separate recovery of metal and acid without secondary pollution and can be well coupled with the original process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for recovering heavy metallic salt and inorganic acid in pickling waste liquid
  • Process for recovering heavy metallic salt and inorganic acid in pickling waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present invention will be further explained below with reference to the drawings and examples

[0026] Such as figure 1 As shown, processing the hot-rolled stainless steel sulfuric acid deoxidation layer pickling waste liquid. Among them, the sulfuric acid cleaning waste liquid contains FeSO 4 60g / L, sulfuric acid 200g / L. The method is:

[0027] The first step: the waste acid is pumped into the alumina ceramic device (a complete set of ceramic membrane equipment of Jiangsu Jiuwu Hi-Tech Co., Ltd., the pore size of the alumina ceramic membrane is 0.05μm) through a corrosion-resistant pump for filtration, and the transmembrane pressure is controlled to 0.2MPa The membrane surface velocity is 2m / s. Remove the suspended solids and reduce the suspended solids of spent acid to 20 NTU.

[0028] The second step: the permeate of the ceramic membrane device passes through the dialysis side of the diffusion dialyzer (Nanjing Jiusi High-tech Co., Ltd. diffusion dialyzer, the ion e...

Embodiment 2

[0033] Such as figure 1 As shown, the treated aluminum surface cleaning waste liquid contains Al 2 (SO 4 ) 3 150g / L, sulfuric acid 250g / L. The method is:

[0034] The first step: the waste acid is pumped into the ceramic membrane device (a complete set of ceramic membrane equipment of Jiangsu Jiuwu High-tech Co., Ltd., the zirconia ceramic membrane pore size is 0.2μm) through a corrosion-resistant pump to filter, and the transmembrane pressure is controlled to 0.4MPa, The membrane surface velocity is 3m / s. Remove the suspended solids and reduce the suspended solids of spent acid to 10 NTU.

[0035] The second step: the permeate of the ceramic membrane device passes through the dialysis side of the diffusion dialyzer (Nanjing Jiusi High-tech Co., Ltd. diffusion dialyzer, the ion exchange membrane adopts the Japanese Asahi Glass DSV anion exchange membrane), and the water is passed into the recovery side at the same time. The ratio of permeate and water of the membrane device is 1...

Embodiment 3

[0040] Such as figure 1 As shown, the processing of stainless steel passivation waste liquid contains 30 g / L of iron ions, 140 g / L of nitric acid, and 80 g / L of hydrofluoric acid. The method is:

[0041] The first step: the waste acid is pumped into the ceramic membrane device (a complete set of ceramic membrane equipment of Jiangsu Jiuwu High-tech Co., Ltd., the pore size of the alumina ceramic membrane is 0.5μm) through a corrosion-resistant pump to filter, and the transmembrane pressure is controlled to 0.5MPa. The membrane surface velocity is 2.5m / s. Remove the suspended solids and reduce the suspended solids of spent acid to 15NTU.

[0042] The second step: the ceramic membrane permeate passes through the dialysis side of the diffusion dialyzer (Nanjing Jiusi High-tech Co., Ltd. diffusion dialyzer, the ion exchange membrane uses the Japanese Asahi Glass APS anion exchange membrane), and the water is passed to the recovery side at the same time, the ceramic membrane device T...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a process for separating and recovering heavy metallic salt and inorganic acid in pickling waste liquid by a membrane method, which comprises the following concrete steps: filtering and removing solid suspended substances in pickling waste liquid through an inorganic ceramic membrane; separating acid from salt in the ceramic membrane penetrating liquid through diffusion dialysis; and heating the dialysis liquid of a diffusion dialyzer, then introducing the dialysis liquid into a nanofiltration membrane, and cooling and crystallizing the concentrated liquid of a nanofiltration device and then centrifuging the crystal of the concentrated liquid to obtain iron salt, wherein the penetrating liquid of the nanofiltration device passes through a reverse osmosis membrane device, the concentrated liquid of the reverse osmosis device returns to a pickling section, and the water discharged from the reverse osmosis device enters a diffusion dialysis section for recycling.The invention has the characteristics that the pickling waste liquid is completely used as resources, the recovery process is simple, the recovery ratio of metallic salt and acid is high, and water is recycled. The process of the invention can be coupled with various pickling sections to realize continuous and stable automated operation, and the supplemented acid amount can be quantitatively controlled according to the acid amount consumed by the crystallized metallic salt.

Description

Technical field [0001] The present invention relates to the field of waste water resource utilization, in particular to a process for separating and recovering heavy metal salts and inorganic acids in waste pickling liquor by using a membrane method, so that the processed waste pickling acids and inorganic acid neutralized metal salts can be comprehensively utilized and reduced waste water disposal. Background technique [0002] In industrial production and mining, smelting (such as the steel industry, titanium dioxide industry, hydrometallurgical industry, titanium industry, electroplating industry, rare earth industry, wood saccharification industry, gold mining and non-ferrous metal smelting industry, etc.), often To use inorganic acids (such as sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, etc.) to clean metal surfaces or dissolve ore. As a result, a large amount of waste acid solution containing various metal ions is produced. Taking the steel industry ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/44B01D71/02
Inventor 邢卫红杨刚王昆徐南平
Owner NANJING TECH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products