Method for comprehensively recovering valuable metals from electroplating waste mud

A valuable metal and solution technology, applied in the direction of improving process efficiency, can solve the problems of small industrial production difficulties, difficult implementation, lengthy process flow, etc., achieve significant economic and social benefits, easy control of process conditions, process Versatile effect

Inactive Publication Date: 2013-10-09
JIANGXI UNIV OF SCI & TECH
View PDF8 Cites 42 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This brings many difficulties to small-scale industrial production, it is very difficult to implement, and it is not easy to promote
Ammonia recovery is to use ammonia water to leach copper, nickel, and zinc in the sludge, while iron and chromium that are difficult to handle remain in the solid. The process of ammonia treatment of electroplating waste sludge is lengthy, and ammonia leaching only separates copper, zinc, and nickel. In order to obtain a single metal, other separation methods are needed for separation, and the recovery rate is not high, especially the solid ratio of the ammonia leaching solution is relatively large, resulting in a large equipment volume, increasing equipment investment, and the amount of leached slag is large, and the iron and chromium in the slag are still Harmless or resource-based treatment is required, so the practicability is not good, so it is difficult to popularize and apply

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Add 500g of electroplating waste sludge dry material (Ni=5.50%; Cu=14.60%; Cr=4.16%; Zn=6.96%; Fe=5.74%) to 1000mL dilute sulfuric acid solution (1 mol / L), Stir at room temperature for 90 minutes, filter, and the acid leaching solution enters the next step of treatment; the acid leaching residue is washed, the washing solution is concentrated and treated uniformly, and the leaching residue is solidified after washing.

[0024] (2) Add the 1350mL pickling solution obtained in step (1) to iron filings 1.2 times the mass of copper powder, stir at room temperature for 60 minutes, filter, and the mother liquor enters into the next step for treatment; the filter residue is washed with water, and the washing solution is concentrated and unified After processing, the filter residue was 71.6g copper powder.

[0025] (3) Slowly add 20% sodium hydroxide solution to the mother liquor in step (2) at room temperature, add 2.8 mL of polyacrylamide flocculant with a mass concentra...

Embodiment 2

[0031] (l) Add 500g of electroplating sludge raw material (Ni=8.40%; Cu=6.62%; Zn=0.10%; Cr=0.56%; Fe=6.08%) to 1000mL of dilute sulfuric acid solution (5mol / L), at room temperature Stir at low temperature for 60 minutes, filter, and the acid leaching solution enters the next step of treatment; the acid leaching residue is washed with water, the washing solution is concentrated and treated uniformly, and the leaching residue is solidified after washing.

[0032] (2) Add the 1300mL pickling solution obtained in step (1) to 1.5 times the iron filings of the copper powder mass, stir and react for 45 minutes at room temperature, filter, and the mother liquor enters into the next step for processing; the filter residue is washed, and the filter residue is 31.9g as copper pink.

[0033] (3) Slowly add 20% sodium carbonate solution with a mass concentration of 20% to the mother liquor in step (2) at room temperature, add 2.6mL of polyacrylic sodium acetate flocculant with a mass conc...

Embodiment 3

[0038] (l) Slurry 500g of electroplating sludge raw material (Ni=9.62%; Cu=8.35%; Zn=6.05%; Fe=10.43%) with water, add 1000mL dilute sulfuric acid solution (10mol / L), at room temperature Stir at low temperature for 30 minutes, filter, and the acid leaching solution enters the next step of treatment; the acid leaching residue is washed, the washing solution is concentrated and treated uniformly, and the leaching residue after washing is solidified.

[0039] (2) Add the 1400mL pickling liquid obtained in step (1) to 1.8 times the iron filings of the copper powder mass, stir and react at room temperature for 30 minutes, filter, and the mother liquor enters into the next step for processing; the filter residue is washed, and the filter residue is 40.1g as copper pink.

[0040] (3) Slowly add 20% sodium hydroxide solution with a mass concentration of 20% to the mother liquor in step (2) at room temperature, add 2.8 mL of a mixed flocculant with a mass concentration of 0.005% polyac...

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 relates to a method for comprehensively recovering valuable metals from electroplating waste mud. The method comprises the following steps of: leaching valuable metals contained in the electroplating waste mud by dilute sulphuric acid, and filtering and separating out acid-leaching slag and a filtrate; replacing copper ions in the filtrate by metallic iron, and filtering and separating copper powder and a filtrate; adding an alkali solution in the filtrate, adding a polymeric flocculant, controlling the pH value of the solution and reacting, and filtering and separating ferric hydroxide and a filtrate; adding the alkali solution in the filtrate, controlling the pH value of the solution and reacting, and filtering to obtain a chromium precipitate and a filtrate; adding the alkali solution in the filtrate, controlling the pH value of the solution, and converting zinc and nickel in the solution to nickel carbonate and zinc carbonate; and dissolving a nickel-zinc coprecipitate by the alkali solution, and filtering and separating out nickel carbonate and a sodium zincate solution, and concentrating and crystallizing the sodium zincate solution to obtain sodium zincate. The method disclosed by the invention is easy to control process conditions, low in treatment cost, and easy to realize large-scale production; the purpose of comprehensively recovering valuable metals is achieved by implementing harmless and resourceful treatment for the electroplating waste mud; and the recovery rate of copper is greater than 95%.

Description

technical field [0001] The invention relates to an electroplating waste mud treatment technology, in particular to a method for comprehensively recovering valuable metals from electroplating waste mud. Background technique [0002] There are many researches on electroplating sludge treatment process, mainly including acid method and ammonia method. The separation of acid leaching liquid metals in the process of acid treatment of electroplating waste sludge mainly includes solvent extraction of copper and solvent extraction of nickel to realize resource recovery of sludge and obtain copper salts and nickel salts respectively. The recovery conditions are high (such as The pH value of the pickling solution, the phase ratio, the concentration of the extractant, the extraction temperature, the extraction time, the concentration of the stripping solution, the ratio of the stripping solution, the recovery conditions of the stripping solution, etc.). This brings many difficulties t...

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): C22B7/00C22B15/00C22B19/30C22B23/00C22B34/32
CPCY02P10/20
Inventor 熊道陵李英邱萍郑慧慧姚国新陈玉娟王庚亮杨金鑫许光辉
Owner JIANGXI UNIV OF SCI & TECH
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