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

A treatment method for separating and recovering copper, iron, zinc, nickel and chromium from chromium-containing sludge

A treatment method, separation and recovery technology, applied to the separation and recovery of copper, iron, zinc, chromium from chromium-containing sludge, and the field of nickel, which can solve the problems of cumbersome steps and high requirements for supporting facilities, so as to reduce the content of chromium , the effect of reducing production

Active Publication Date: 2021-08-24
WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is a dry method-wet method-dry method, and the chromium calcined later still needs to be separated by wet method, the steps are cumbersome, and the requirements for supporting facilities are relatively high

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
  • A treatment method for separating and recovering copper, iron, zinc, nickel and chromium from chromium-containing sludge
  • A treatment method for separating and recovering copper, iron, zinc, nickel and chromium from chromium-containing sludge
  • A treatment method for separating and recovering copper, iron, zinc, nickel and chromium from chromium-containing sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The chromium-containing sludge in a factory area contains 20% chromium, 10% zinc, 5% Cu, 1% Fe, and 1% Ni. Add sulfuric acid to 100g of chromium-containing sludge to dissolve completely, the concentration of acid added is 10%, and the amount of acid added is 400g. After electrolyzing the acid-dissolved solution for 24 hours, the copper in the solution was removed, and the concentration of copper ions in the solution was 37 mg / m 3 , 4.8g copper elemental substance was recovered. And use the extraction method to remove the iron in the solution, the iron ion concentration in the solution is 49mg / m 3 . After back-extracting the iron extract, a solution of ferric iron is obtained, and after reduction with excess reduced iron powder, a ferrous sulfate solution is obtained. Add 10% sodium hydroxide to the solution to adjust the pH value to 9, and filter to obtain sludge and high-salt solution. Add ferrous sulfate to the high-salt solution, adjust the pH value to 11, heat a...

Embodiment 2

[0044] The chromium-containing sludge in a factory area contains 15% chromium, 3% zinc, 6% Cu, 2% Fe and 2% Ni. Add sulfuric acid to 100g of chromium-containing sludge to dissolve completely, the concentration of acid added is 40%, and the amount of acid added is 100g. After electrolyzing the acid-dissolved solution for 24 hours, the copper in the solution was removed, and the concentration of copper ions in the solution was 42mg / m 3 , 5.9g copper elemental substance was recovered. And use the extraction method to remove the iron in the solution, the iron ion concentration in the solution is 21mg / m 3 . After back-extracting the iron extract, a solution of ferric iron is obtained, and after reduction with excess reduced iron powder, a ferrous sulfate solution is obtained. Add 10% sodium hydroxide to the solution to adjust the pH value to 10, and filter to obtain sludge and high-salt solution. Add ferrous sulfate to the high-salt solution, adjust the pH value to 12, heat at ...

Embodiment 3

[0049] The chromium-containing sludge in a factory area contains 5% chromium, 18% zinc, 4% Cu, 1% Fe, and 1% Ni. Add sulfuric acid to 100g of chromium-containing sludge to dissolve completely, the concentration of acid added is 20%, and the amount of acid added is 200g. After electrolyzing the acid-dissolved solution for 24 hours, the copper in the solution was removed, and the concentration of copper ions in the solution was 16mg / m 3 , 3.8g copper elemental substance was recovered. And use the extraction method to remove the iron in the solution, the iron ion concentration in the solution is 24mg / m 3 . After back-extracting the iron extract, a solution of ferric iron is obtained, and after reduction with excess reduced iron powder, a ferrous sulfate solution is obtained. Add 5% sodium hydroxide to the solution to adjust the pH value to 7, and filter to obtain sludge and high-salt solution. Add ferrous sulfate to the high-salt solution, adjust the pH value to 10, heat at 7...

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 application of the present invention provides a treatment method for separating and recovering copper, iron, zinc, nickel and chromium from chromium-containing sludge, which belongs to the field of resource utilization of industrial waste liquid. After the chromium-containing sludge is acid-dissolved, the copper and iron in the solution are removed by electrolysis and extraction to obtain a ferrous sulfate solution; the obtained impurity removal solution is neutralized and filtered to obtain sludge 1 and a high-salt solution; the obtained high-salt solution is added with lye, and The obtained ferrous sulfate solution is filtered to obtain a ferrite product and a sulfate solution for removing impurities; the sludge 1 is soaked in alkali, and put into a reduction tank of a diaphragm electrolytic cell to obtain a sludge 2 and a zinc-containing solution; the sludge 2 Put it into the oxidation tank of the diaphragm electrolytic cell and dissolve it with lye, electrolytically filter and wash to obtain nickel sludge product and zinc-containing hexavalent chromium solution; add acid to the zinc-containing hexavalent chromium solution, neutralize and filter and wash to obtain chromium-containing zinc sludge and hexavalent chromium solution; add acid and reducing agent to the obtained chromium solution to obtain trivalent chromium chromium solution and add alkali to obtain chrome tanning agent products. The invention realizes resource utilization of chromium-containing sludge without generation of three wastes.

Description

technical field [0001] The invention belongs to the field of resource utilization of industrial waste liquid, and in particular relates to a treatment method for separating and recovering copper, iron, zinc, nickel and chromium from chromium-containing sludge. Background technique [0002] With the development of the electroplating industry, the output of electroplating wastewater and sludge is increasing. Due to the high toxicity of chromium-containing sludge, the treatment is difficult and the requirements are high, so the treatment difficulty is much higher than other sludges. Chromium-containing sludge also contains other heavy metal impurities, especially zinc and aluminum impurities, which are difficult to distinguish directly by alkali leaching because they are all amphoteric oxides. The usual method is to add an oxidizing agent in the alkaline leaching process to oxidize trivalent chromium to hexavalent chromium, while leaching aluminum and zinc at the same time, 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 Patents(China)
IPC IPC(8): C22B7/00C22B15/00C22B34/32C22B23/00C22B19/20C22B19/30C01D5/06C01D5/16C01D5/18C14C3/06
CPCC01D5/06C01D5/16C01D5/18C14C3/06C22B7/006C22B15/0084C22B19/20C22B19/30C22B23/0453C22B34/32Y02P10/20
Inventor 姜德胜陈琪张家东
Owner WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO 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