Disposal method for iron and steel pickling waste water containing hydrochloric acids

A steel pickling and disposal method technology, applied in metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve environmental pollution and other problems, achieve reduced emissions, low production costs, and disposal process simple effect

Inactive Publication Date: 2015-01-21
昆山市千灯三废净化有限公司
View PDF5 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, the present invention provides a treatment method for steel pickling wastewater containing hydrochloric acid, which can not only recover hydrochloric acid for recycling,

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
  • Disposal method for iron and steel pickling waste water containing hydrochloric acids

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0028] Specific embodiment one: (1) carry out mechanical filtration respectively to the waste acid liquid and pickling cleaning water that produce in steel pickling production process, purify impurity removal, and mechanical filtration is specifically to filter by the filter core of precision filter, purify and remove impurity , wherein the hydrochloric acid concentration of the waste acid solution after mechanical filtration is 8.5%, and the iron content is 4.5%;

[0029] (2) The waste acid solution after purification and removal of impurities and pickling cleaning water flow through the inside of the anion exchange membrane diffusion dialyzer at the same time, specifically, the waste acid solution fills the stock solution chamber of the anion exchange membrane diffusion dialyzer from the stock solution inlet, At the same time, pickling cleaning water fills the diffusion liquid chamber of the anion exchange membrane diffusion dialyzer from the diffusion liquid inlet, leaves st...

specific Embodiment 2

[0032] Specific embodiment two: (1) waste acid liquid and pickling cleaning water produced in the iron and steel pickling production process are mechanically filtered respectively to purify and remove impurities, and mechanical filtration is specifically filtered by a filter element of a precision filter, and purified and removed , wherein the hydrochloric acid concentration of the waste acid liquid after mechanical filtration is 13.3%, and the iron content is 7.8%;

[0033] (2) The waste acid solution after purification and removal of impurities and pickling cleaning water flow through the inside of the anion exchange membrane diffusion dialyzer at the same time, specifically, the waste acid solution fills the stock solution chamber of the anion exchange membrane diffusion dialyzer from the stock solution inlet, At the same time, pickling cleaning water is filled with the diffusion liquid chamber of the anion exchange membrane diffusion dialyzer from the diffusion liquid inlet...

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

No PUM Login to view more

Abstract

The invention discloses a disposal method for iron and steel pickling waste water containing hydrochloric acids. Through the adoption of the method disclosed by the invention, not only can the hydrochloric acids be recovered for cyclic utilization, so that the optimal allocation of sources is realized, but also the problem of environmental pollution is solved, the discharge of pollutants is reduced, and the method has the advantages of low production cost, simple technology and the like. The method comprises the following steps: spent acid solutions after purification and impurity removal and pickling cleaning water flow through the internal part of an anion exchange membrane diffusion dialyzator at the same time, so that the spent acid solutions flowing out of the internal part of the anion exchange membrane diffusion dialyzator are changed into raffinate containing iron with a low content of hydrochloric acids, and the cleaning water flowing out of the internal part of the anion exchange membrane diffusion dialyzator is changed into recovered acids containing a large quantity of hydrochloric acids, an extremely small quantity of iron ions and an extremely small quantity of ferrous ions; then the recovered acids are returned to an iron and steel pickling workshop section for cyclic utilization, and are continuously used for pickling; the raffinate containing the iron is led to a waste water collecting pond for neutralizing treatment and pressure filtration treatment, and iron mud and filtrate which reaches a discharge standard are obtained.

Description

technical field [0001] The invention relates to the technical field of waste liquid treatment, in particular to a treatment method for steel pickling wastewater containing hydrochloric acid. Background technique [0002] Pickling in the steel industry such as stainless steel and steel cord will produce a large amount of acid liquid waste containing hydrochloric acid, and the concentration of free hydrochloric acid in the pickling waste liquid is about 5% to 20%. At present, the methods for treating this kind of waste liquid are mainly acid-base neutralization, evaporation, concentration, cooling and crystallization, etc., which not only have high treatment costs, but also cause waste of hydrochloric acid, and also have a great impact on the environment. Contents of the invention [0003] In view of the above problems, the present invention provides a treatment method for steel pickling wastewater containing hydrochloric acid, which can not only recover hydrochloric acid fo...

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
IPC IPC(8): C02F9/04C23G1/36C02F103/16
CPCC02F9/00C02F1/42C02F1/44C02F2001/422C02F2103/16C23G1/36
Inventor 郑细东庄永金梁云周俊万永仙
Owner 昆山市千灯三废净化有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap