Method for respectively recycling copper, nickel and zinc from electroplating sludge

A technology of electroplating sludge and sponge copper, which is applied in the field of iron, high copper, nickel, zinc treatment process, separation and value of calcium, zinc, copper in high zinc electroplating sludge, and copper in electroplating sludge respectively, It can solve the problems of secondary waste, resource waste, and large amount of alkali consumption, and achieve the effects of reducing environmental hazards, strong applicability, and simple operation

Active Publication Date: 2017-10-24
盛隆资源再生(无锡)有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, direct incineration of metals such as copper, nickel and zinc in hazardous solids is an important national strategic resource, which can be said to be a waste of resources
[0004] CN201210277773.5 provides a resource recycling process for electroplating sludge, but the biggest disadvantage of recycling valuable metals in electroplating sludge by hydrolysis and precipitation is that the content of valuable metals in electroplating sludge should not be too high, such as copper and nickel content is too high , the corresponding initial hydrolysis pH decreases, and the effect of sorting and recovering valuable metals is greatly reduced
[0005] CN201210277773.5 provides a resource recovery process for electroplating sludge, wherein only the hydrolysis hydrolysis precipitation method and the properties of zinc are used to classify and recover copper, nickel, and zinc. This process can recover copper in high copper and high nickel electroplating sludge The effect will be very poor, and most of the copper will enter the chromium slag, resulting in a waste of copper, and the amount of alkali used in the separation process of nickel and zinc is huge
[0006] CN201310662501.1 provides a treatment method for copper-containing electroplating sludge, which can only recover copper in electroplating sludge, and cannot recover other valuable metals, such as nickel, zinc, etc. It is impossible to judge how to treat the waste water after copper recovery due to the lack of the final process
[0007] CN201511008482.6 provides a method for recovering zinc from the waste zinc-containing mud cake of electro-galvanizing. It is technically aimed at the recovery of zinc in high-zinc electroplating sludge, and the zinc recovery process is relatively complicated, and secondary waste is generated during the recovery process. substance, and there is no corresponding disposal method in the process

Method used

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  • Method for respectively recycling copper, nickel and zinc from electroplating sludge
  • Method for respectively recycling copper, nickel and zinc from electroplating sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Get 600kg of electroplating sludge (hereinafter referred to as solid waste, its main components are Cu, Ni, Zn, Ca, Fe) produced by a certain factory, put the electroplating sludge into 1# reactor, add 0.9t of 10wt% dilute sulfuric acid , normal temperature, after fully stirring for 0.5h, the leaching ends, and the solution is poured into a filter press, filtered and separated to obtain calcium sulfate product and solution ①, which contains Zn 2+ 、Cu 2+ 、Ni 2+ , Fe 2+ , Fe 3+ ;

[0038] Pour the solution ① into the 2# reaction kettle, add 1 times the theoretical amount of iron powder, stir at room temperature for 1 hour, pour it into the filter, filter to obtain sponge copper and solution ②, the solution ② contains Zn 2+ 、Ni 2+ , Fe 2+ , Fe 3+ ;

[0039] Put the solution ② into the dissolution tank, use the aeration device to aerate with oxygen for 4 hours, and the aeration volume is 2m 3 / h, the oxygen concentration is 20%, and utilize steam to heat solution ②...

Embodiment 2

[0044]Take 800kg of electroplating sludge (hereinafter referred to as solid waste, its main components are Cu, Ni, Zn, Ca, Fe) produced by a certain factory, put the electroplating sludge into 1# reactor, add 1.6t of 10wt% concentrated sulfuric acid , normal temperature, after fully stirring for 1.5h, the leaching ends, and the solution is poured into a filter press, filtered and separated to obtain calcium sulfate product and solution ①, which contains Zn 2+ 、Cu 2+ 、Ni 2+ , Fe 2+ , Fe 3+ ;

[0045] Put the solution ① into the 2# reaction kettle, add 2 times the theoretical amount of iron powder, stir at room temperature for 1 hour, pour it into the filter, filter to obtain sponge copper and solution ②, the solution ② contains Zn 2+ 、Ni 2+ , Fe 2+ , Fe 3+ ;

[0046] Put the solution ② into the dissolution tank, use the aeration device to aerate with oxygen for 5 hours, and the aeration volume is 3m 3 / h, the oxygen concentration is 22%, and utilize steam to heat solut...

Embodiment 3

[0051] Take 1000kg of electroplating sludge (hereinafter referred to as solid waste, its main components are Cu, Ni, Zn, Ca, Fe) produced by a certain factory, put the electroplating sludge into 1# reactor, add 10wt% concentrated sulfuric acid 2.5t , normal temperature, after fully stirring for 2 hours, the leaching is completed, the solution is put into a filter press, filtered and separated to obtain calcium sulfate product and solution ①, solution ① contains Zn 2+ 、Cu 2+ 、Ni 2 + , Fe 2+ , Fe 3+ ;

[0052] Pour the solution ① into the 2# reaction kettle, add 3 times the theoretical amount of iron powder, stir at room temperature for 1 hour, pour it into the filter, filter to obtain sponge copper and solution ②, the solution ② contains Zn 2+ 、Ni 2+ , Fe 2+ , Fe 3+ ;

[0053] Put the solution ② into the dissolution tank, use the aeration device to aerate with oxygen for 6 hours, and the aeration volume is 4m 3 / h, the oxygen concentration is 24%, and utilize steam to...

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Abstract

An applicator provides a method for respectively recycling copper, nickel and zinc from electroplating sludge. The method comprises the following steps: adding sulfuric acid into the electroplating sludge to be dissolved to obtain a solution, and carrying out solid-liquid separation to obtain calcium sulfate; carrying out reductive treatment on the obtained solution (1) after dissolution to obtain sponge copper; adding hydrochloric acid into refined iron hydroxide obtained by carrying out multi-stage washing, heating and copolymerizing to obtain polyferric chloride; enabling the solution (6) produced by carrying out multi-stage washing to renewedly return to the solution (3) for recycling; calcining coarse zinc hydroxide subjected to ammonia leaching to obtain zinc oxide; carrying out concentration and cooling treatment on the solution (4) obtained by carrying out ammonia leaching to prepare nickel ammonium sulfate; and carrying out concentration and cooling treatment on the solution (5) obtained by carrying out nickel and zinc removal to prepare sodium sulfate. The invention provides an electroplating sludge treatment process with simple operation, high applicability, no pollution, high value of valuable metals, and environmental protection.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a process for separately recovering copper, nickel and zinc in electroplating sludge, especially copper and nickel in electroplating sludge with high copper and high zinc content (copper and zinc content are respectively greater than 2wt%) , iron, zinc, calcium separation and value method. Background technique [0002] The electroplating industry is an indispensable part of the modern industrial system. From a small screw to a large automobile, aircraft, ship, etc., it is inseparable from electroplating. At the same time, it brings electroplating sludge generated during the electroplating process. Increasingly, electroplating sludge has caused serious harm to the ecological environment and human health due to its excessive heavy metal and toxic substances. [0003] At present, the most effective way to treat hazardous solid waste at home and abroad is incinerati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B19/04C22B19/20C22B23/00
CPCC22B7/007C22B7/008C22B15/0071C22B15/0091C22B19/24C22B19/30C22B23/0446Y02P10/20
Inventor 周欢欢郎超方稳钊现花刘秋月
Owner 盛隆资源再生(无锡)有限公司
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