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
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  • 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1:

[0023] (1) Add 500g of electroplating waste mud dry material (Ni=5.50%; Cu=14.60%; Cr=4.16%; Zn=6.96%; Fe=5.74%) into 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 processing; the acid leaching residue is washed, the washing solution is concentrated and then treated uniformly, and the leaching residue is solidified after washing.

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

[0025] (3) Add 20% sodium hydroxide solution by mass concentration to the mother liquor of step (2) slowly at room temperature, add 2.8 mL of 0.01% polya...

Example Embodiment

[0030] Example 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%) into 1000mL of dilute sulfuric acid solution (5mol / L), at room temperature After stirring for 60 minutes, filtering, the acid leaching solution enters the next step for processing; the acid leaching residue is washed with water, the washing solution is concentrated and then treated uniformly, and the leaching residue is solidified after washing.

[0032] (2) Add the 1300mL acid leaching solution obtained in step (1) to iron scraps 1.5 times the weight of copper powder, 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 for copper powder.

[0033] (3) Slowly add 20% sodium carbonate solution by mass concentration to the mother liquor of step (2) at room temperature, add 2.6 mL of 0.01% sodium polyacrylate flocculant by mass c...

Example Embodiment

[0037] Example 3:

[0038] (l) Put 500g of electroplating sludge raw materials (Ni=9.62%; Cu=8.35%; Zn=6.05%; Fe=10.43%) into the slurry first with water, and add 1000mL dilute sulfuric acid solution (10mol / L) at room temperature After stirring for 30 minutes, filtering, the acid leaching solution enters the next step for processing; the acid leaching residue is washed, the washing solution is concentrated and then treated uniformly, and the leaching residue is solidified after washing.

[0039] (2) Add the 1400mL acid leaching solution obtained in step (1) to 1.8 times the weight of copper powder iron filings, stir and react for 30 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 40.1g for copper powder.

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

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PUM

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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

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Application Information

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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
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