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

Comprehensive harmless treatment and recycling method for chromium-containing wastewater on electrolytic tinplate production line

A technology of harmless treatment and electroplating of tin plates, which is applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. Superior performance, high degree of automation, easy operation and management

Inactive Publication Date: 2014-11-26
GUANGZHOU PACIFIC TINPLATE
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chromium-containing wastewater produced every day is discharged after being mixed with the original sewage facilities, coagulated and sedimented, and the ρ(Cr 6+ ) is unstable, and sometimes exceeds 0.2mg / L. At the same time, due to the large amount of wastewater treatment sludge, it is easy to have adverse effects on the environment

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
  • Comprehensive harmless treatment and recycling method for chromium-containing wastewater on electrolytic tinplate production line
  • Comprehensive harmless treatment and recycling method for chromium-containing wastewater on electrolytic tinplate production line
  • Comprehensive harmless treatment and recycling method for chromium-containing wastewater on electrolytic tinplate production line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the figures and specific embodiments.

[0024] Principle Description

[0025] Ion exchange is carried out by a substance called an ion exchanger. The ions in the solid ion exchanger are exchanged with the ions in the dilute solution to achieve the purpose of extracting or removing some ions in the solution. A unit operation belonging to the mass transfer separation process; ion exchange is a reversible equivalent exchange reaction.

[0026] Ion exchange resin is a high molecular polymer with high exchange capacity, mostly spherical particles, low water flow resistance, high mechanical strength and good chemical stability.

[0027] The chromium-containing waste liquid to be treated in this case is mainly composed of sodium dichromate and a small amount of trivalent chromium, and has the following chemical equilibrium characteristics (partially):

[0028] Na 2 Cr 2 o 7 +2H + ==H 2 Cr 2 o ...

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 comprehensive harmless treatment and recycling method for chromium-containing wastewater on an electrolytic tinplate production line. The method comprises the following treatment steps: (1) inputting the chromium-containing wastewater into a filtering device for filtering; (2) inputting the filtered wastewater into an oxidization bed for treating; (3) inputting the wastewater treated by the oxidization bed into a dechromization bed for treating; (4) inputting the wastewater treated by the dechromization bed into a purification bed for treating; and (5) inputting the wastewater treated by the purification bed into a reduction bed for treating. The comprehensive harmless treatment and recycling method has the beneficial effects of safe and reliable treatment process, easiness in running and maintenance, reasonable equipment design, superior performance, high controllability, high automation degree, attractive and elegant layout of equipment, convenience in operation and management, reasonable investment and running cost and low treatment cost.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for comprehensive harmless treatment and reuse of chromium-containing wastewater from an electrolytic tin plate production line. Background technique [0002] Electroplating, tanning and chromium salt industries discharge a large amount of chromium-containing wastewater every year. Among them, the discharge of electroplating wastewater alone reaches 4 billion m 3 / a (cubic meters per year). The harmless treatment of chromium-containing wastewater is one of the indispensable technological links in the above-mentioned industrial processes. [0003] Chromium exists in the form of Cr in electroplating chromium-containing wastewater 6+ and Cr 3+ Two kinds, of which Cr 6+ most toxic. Electroplating chromium-containing wastewater is acidic, and chromium ions are mainly composed of CrO 4 2- and CrO 7 2- form exists. Cr(VI) is highly toxic and highly irritating and ...

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 Applications(China)
IPC IPC(8): C02F9/04C02F101/22C02F103/16
Inventor 魏林宝陈显斌田森林李国雄黄友明罗振东
Owner GUANGZHOU PACIFIC TINPLATE
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

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com