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Method for recycling copper from electroplating sludge and electroplating wastewater

A technology for electroplating waste liquid and electroplating sludge, which is applied in the fields of metallurgical chemical industry and electrochemical copper recovery to achieve the effect of wide adaptability

Active Publication Date: 2012-05-02
YANGZHOU NINGDA NOBLE METAL CO LTD
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Problems solved by technology

[0004] In order to solve the problem of copper recovery in electroplating sludge and electroplating waste liquid, and achieve the purpose of clean and efficient copper recovery, the present invention proposes a combination of tubular electrolysis and fluidized electrowinning for low concentration and complex components from electroplating sludge, Method for recovering copper from electroplating waste liquid

Method used

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Embodiment Construction

[0017] 1. Analysis

[0018] Through chemical analysis, the average copper content of this batch of electroplating copper-containing sludge is 3%, and the water content is 70%; the average copper content of electroplating copper-containing waste liquid is 15g / l.

[0019] 2. Copper recovery process steps:

[0020] 1. Leaching:

[0021] Put copper-containing electroplating sludge, electroplating copper-containing waste liquid, and concentrated sulfuric acid into the mixer respectively, mix for 1.5-2.0 hours, and control: the pH value of the leaching end point is 1.0-1.5, and the leaching temperature is maintained at 60-80 ° C. After filtering, Take the filtrate to obtain a copper-containing leaching solution with a copper ion concentration ≥ 10 g / l.

[0022] 2. Homogenization

[0023] Mix the copper-containing leaching solution, electroplating copper-containing waste liquid and concentrated sulfuric acid, and then successively filter through sand filter and activated carbon to...

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Abstract

The invention relates to a method for recycling copper from electroplating sludge and electroplating wastewater, and relates to the technical field of chemical engineering and metallurgy. The method adopts process technologies such as leaching, homogenization, tubular electrolysis and fluidized electrodeposition to obtain a high-value electrolytic copper plate and electrodeposited copper powder respectively; the comprehensive recovery rate of copper is more than 98% which is obviously superior to that of traditional recovery methods such as displacement method and chemical precipitation method, and coupon electrodeposition method; and the method is widely suitable for different kinds of copper-containing electroplating sludge and copper-containing electroplating wastewater. The obtained electrolytic copper plate meets the demands of GB / T467-1997 on the standard cathode copper with a brand of Cu-CATH-2 and the copper content of the obtained electrodeposited copper powder is more than 80%.

Description

technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, in particular to the technical field of electrochemical recovery of copper. Background technique [0002] The electroplating sludge and electroplating waste liquid described in the present invention refer to a kind of hazardous waste produced in the electroplating industrial production, the former refers to the copper-containing wet sludge produced by the neutralization and treatment of electroplating wastewater, and the latter refers to the Liquid waste such as bath change solution, deplating solution, cleaning solution, etc. Due to the different types of plating, the electroplating sludge and electroplating waste liquid produced are of various types, complex components, and different levels of copper. Copper-containing sludge often contains impurity metals such as iron, nickel, chromium, zinc, etc., and the copper content ranges from 1% to 10%, and some are even lower ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/08C22B3/22C25C1/12C25C5/02C22B15/00
CPCY02P10/20
Inventor 樊红杰
Owner YANGZHOU NINGDA NOBLE METAL CO LTD
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