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Method of comprehensively recycling valuable metals in plating sludge

A technology for electroplating sludge and valuable metals, applied in the direction of improving process efficiency, etc., can solve the problems of high sealing and corrosion resistance requirements of leaching devices, low leaching rate, lengthy separation process, etc., and achieve significant economic benefits and social benefits, process conditions are easy to control, and the effect of strong process versatility

Inactive Publication Date: 2018-11-06
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Pyro-smelting technology only recovers copper and nickel, but there are still shortcomings such as high energy consumption, secondary pollution caused by the output of harmful gases, and large infrastructure investment;
[0007] (2) The selectivity of the ammonia leaching technology is good, but the leaching rate is not high, and the iron and chromium in the slag need to be harmless or recycled. loss, ammonia itself has a pungent smell, which will cause a bad operating environment, and requires high sealing and corrosion resistance of the leaching device;
However, the separation process of various metal ions in the current acid leaching solution is lengthy, requires high process condition control, and complicated operation

Method used

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  • Method of comprehensively recycling valuable metals in plating sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The method for the comprehensive recovery of valuable metals in the electroplating sludge provided by the embodiments of the present invention includes:

[0054] (l) 800g of electroplating sludge wet material with a moisture content of 70% (containing Ni 4.07% by dry weight; Cu 3.57%; Cr2.60%; Zn 1.6%; Fe 15.56%) was added to 600mL with a mass concentration of 30% The sulfuric acid solution was stirred at room temperature for 90 minutes, filtered, and the acid leaching solution was processed in the next step; the acid leaching slag was washed, and the washing solution was concentrated and treated uniformly, and the leaching slag was solidified after washing.

[0055] (2) Add 800mL of pickling solution obtained in step (1) to 1.6 times the iron filings of the copper powder mass, stir at room temperature for 30 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 pr...

Embodiment 2

[0061] The method for the comprehensive recovery of valuable metals in the electroplating sludge provided by the embodiments of the present invention includes:

[0062] (1) Add 400g of dry electroplating sludge raw material (containing Ni 4.40%; Cu 5.62%; Zn 2.76%; Cr 2.56%; Fe5.83%) to 1350mL mass concentration of 25% dilute sulfuric acid solution, and stir at room temperature for 120min, Filtration, the pickling solution enters the next step of treatment; the pickling residue is washed with water, the washing solution is concentrated and treated uniformly, and the washed leaching residue is solidified.

[0063] (2) 1000mL pickling solution that step (1) obtains is added 1.4 times iron filings of copper powder quality, under normal temperature stirring reaction 45min, filter, and mother liquor enters next step processing; Filter residue is washed, and filter residue is 22.3g copper powder, The washing water is concentrated and treated uniformly.

[0064] (3) 15% sodium carbo...

Embodiment 3

[0069] The method for the comprehensive recovery of valuable metals in the electroplating sludge provided by the embodiments of the present invention includes:

[0070](1) 400g of dry electroplating sludge raw material (containing Ni 6.58%; Cu 7.35%; Zn 1.36%; Cr 1.83%; Fe8.63%) was added into 1350mL mass concentration of 25% dilute sulfuric acid solution, stirred at room temperature for 120min, Filtration, the pickling solution enters the next step of treatment; the pickling residue is washed with water, the washing solution is concentrated and treated uniformly, and the washed leaching residue is solidified.

[0071] (2) Add the 1000mL pickling liquid obtained in step (1) to 1.6 times the iron filings of the copper powder quality, stir and react for 30min at room temperature, filter, and the mother liquor enters the next step for processing; the filter residue is washed, and the filter residue is 29.2g as copper powder , and the washing liquid is concentrated and processed u...

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Abstract

The invention belongs to the technical field of plating sludge treatment and discloses a method of comprehensively recycling valuable metals in plating sludge. The method comprises: extracting value metals from plating sludge by leaching, and isolating acid leaching residue and acid leaching liquid; adding iron powder, stirring, and filtering to isolate copper powder and a mother liquid; adding hydrogen peroxide and sodium carbonate solution, adding a composite flocculating agent so that iron ions in the solution form iron hydroxide precipitate and chromium ions form chromium hydroxide precipitate, wherein the precipitates settle fast, and isolating ferrochromium slag and a mother liquid containing zinc and nickel; using P507 extracting agent to extract zinc in the mother liquid containingzinc and nickel, back-extracting an organic phase via sulfuric acid to obtain zinc sulfate solution, and crystallizing to obtain zinc sulfate septahydrate; adding the sodium hydroxide solution into nickel raffinate, filtering to obtain nickel hydroxide precipitate, adjusting mother liquid pH to 7 for the filtrate through sulfuric acid, and crystallizing to isolate sodium sulfate decahydrate. Precipitate washing liquids herein are cyclically used, emission of wastewater is decreased, and significant economic and social benefits are created.

Description

technical field [0001] The invention belongs to the technical field of electroplating sludge treatment, in particular to a method for comprehensive recovery of valuable metals in electroplating sludge. Background technique [0002] Electroplating sludge is processed from electroplating wastewater. It is rich in various metal elements, such as copper, nickel, zinc, chromium, iron, etc., and the content is often much higher than that in rich ores. If it is not properly disposed of, it is easy to cause secondary pollution. Pollution. With the development of my country's electroplating industry, the output of this kind of sludge will inevitably increase and its nature will become more complex. Research on its comprehensive utilization can not only effectively reduce its environmental hazards, but also make use of metal resources. [0003] At present, the existing technologies commonly used in the industry are as follows: [0004] At present, the comprehensive utilization and tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B19/30C22B19/20C22B26/10C22B34/32C22B23/00
CPCC22B7/007C22B15/0091C22B19/26C22B19/30C22B23/0461C22B26/10C22B34/32C22B3/26Y02P10/20
Inventor 李晓波梁建伟梁焘茂邱廷省
Owner JIANGXI UNIV OF SCI & TECH
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