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

Treatment method of pyrophosphate-zinc-nickel citrate electroplating wastewater

A technology of electroplating wastewater and zinc citrate, which is applied in metallurgical wastewater treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems of nickel and zinc, low efficiency of lemon root, high treatment cost, etc., and achieve The effect of simple process, low processing cost and good market application prospect

Active Publication Date: 2019-08-06
GUANGZHOU ULTRA UNION CHEM LTD
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Pyrophosphate-citric acid system zinc-nickel alloy electroplating wastewater contains trisodium citrate complexing agent, citrate root has strong oxidation resistance, and the efficiency of destroying lemon root by traditional oxidation method is low. Generally, it is necessary to add a large amount of oxidant to destroy the coordination of citric acid agent, the treatment cost is high, and it is difficult to effectively remove citrate in winter when the temperature is low
Therefore, if the traditional oxidation-hydroxide precipitation method is used to treat zinc-nickel alloy electroplating wastewater containing citric acid, the content of nickel and zinc after treatment often cannot meet the requirements of GB21900-2008 "Electroplating Pollutant Discharge Standard"

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
  • Treatment method of pyrophosphate-zinc-nickel citrate electroplating wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: Treatment of zinc-nickel alloy electroplating wastewater containing potassium pyrophosphate 6000 mg / L

[0046] Step 1, add ferrous chloride and calcium chloride

[0047] The zinc-nickel alloy electroplating wastewater is transported from the wastewater regulating tank to the feeding tank, the tank liquid is stirred with a mixer, the pH is adjusted to 7 by adding hydrochloric acid, and 18L of ferrous chloride solution and 40L of calcium chloride solution are added to each ton of wastewater.

[0048] Step 2. Precipitation of complexing agents and heavy metal ions

[0049] The wastewater in the feeding tank flows into the sedimentation tank, the tank liquid is stirred with a mixer, the pH is adjusted to 10-11.5 by adding lime emulsion, the ferrous ion and the calcium ion cooperate to precipitate citrate, and the calcium ion and pyrophosphate form calcium pyrophosphate precipitation, from the compound The nickel ions and zinc ions released from the ions form ...

Embodiment 2

[0058] Embodiment 2: process the zinc-nickel alloy electroplating wastewater containing potassium pyrophosphate 2500 mg / L

[0059] Step 1, add ferrous chloride and calcium chloride

[0060] The zinc-nickel alloy electroplating wastewater is transported from the wastewater regulating tank to the feeding tank, the tank liquid is stirred with a mixer, the pH is adjusted to 7 by adding hydrochloric acid, and 10L of ferrous chloride solution and 20L of calcium chloride solution are added to each ton of wastewater.

[0061] Step 2. Precipitation of complexing agents and heavy metal ions

[0062] The wastewater in the feeding tank flows into the sedimentation tank, the tank liquid is stirred with a mixer, the pH is adjusted to 10-11.5 by adding lime emulsion, the ferrous ion and the calcium ion cooperate to precipitate citrate, and the calcium ion and pyrophosphate form calcium pyrophosphate precipitation, from the compound The nickel ions and zinc ions released from the ions form pre...

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 method for treating pyrophosphate- citric acid zinc-nickel alloy electroplating wastewater, the method comprises the following steps of: adding ferrous chloride and calcium chloride into the wastewater, adjusting the pH value to 10-11.5 by using lime emulsion, co-precipitating a citric acid complexing agent by ferrous ions and calcium ions, precipitating pyrophosphate bythe calcium ions, generating corresponding hydroxides and other precipitates by nickel ions and zinc ions, and generating nickel phosphate and zinc phosphate precipitates by phosphate ions, adding anoxidant to oxidize other organic matters, and adjusting the ph of the wastewater to 6-9. The treatment results meet the requirements of GB 21900-2008 ''Discharge Standard of Electroplating Pollutants''. The new method for removing a carboxyl-containing organic acid complexing agent in the wastewater by precipitation of the ferrous ions and calcium ions is established, and the method has simple andeasy process, low treatment cost and better market application prospect.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, in particular to a treatment method for pyrophosphate-citric acid system zinc-nickel alloy electroplating wastewater. Background technique [0002] Pyrophosphate-citric acid system zinc-nickel alloy electroplating wastewater contains trisodium citrate complexing agent, citrate root has strong oxidation resistance, and the efficiency of destroying lemon root by traditional oxidation method is low. Generally, it is necessary to add a large amount of oxidant to destroy the coordination of citric acid agent, the treatment cost is high, and it is difficult to effectively remove citrate in winter when the temperature is low. Therefore, the traditional oxidation-hydroxide precipitation method is used to treat zinc-nickel alloy electroplating wastewater containing citric acid, and the content of nickel and zinc after treatment often does not meet the requirements of GB21900-2008 "...

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): C02F9/04C02F103/16C02F101/34C02F101/30C02F101/20C02F101/10
CPCC02F1/56C02F1/58C02F1/62C02F1/66C02F1/722C02F1/76C02F9/00C02F2101/105C02F2101/20C02F2101/30C02F2101/34C02F2103/16C02F2209/04
Inventor 郭崇武赖奂汶
Owner GUANGZHOU ULTRA UNION CHEM LTD
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