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Method for comprehensively recycling copper and nickel in electroplating sludge

A technology for electroplating sludge and copper-nickel, which is applied in the improvement of process efficiency, flotation, solid separation, etc., can solve the problems of low operation efficiency, complex process, difficult enrichment, etc., and achieves wide adaptability, easy implementation and control. , Reasonable effect of process flow

Active Publication Date: 2019-03-26
广东省资源综合利用研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since these valuable metal elements mostly exist in the form of highly dispersed oxides, it is difficult to enrich them by conventional means.
The core of the current research on the recovery of valuable metal elements is mainly concentrated in the leaching technology system of non-ferrous metals, such as ammonia leaching method, sulfuric acid leaching method, etc. There are problems such as high cost, complicated process, and low operating efficiency in the process.

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  • Method for comprehensively recycling copper and nickel in electroplating sludge
  • Method for comprehensively recycling copper and nickel in electroplating sludge

Examples

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Effect test

Embodiment 1

[0026] The object of treatment is the electroplating sludge of an electroplating factory in Jiangmen, Guangdong, in which the mass percentages of copper and nickel are 2.48% and 1.59%, respectively. The following processes are used to treat the electroplating sludge and recover copper and nickel:

[0027] (1) Mix electroplating sludge with vulcanization and roasting additives, make pellets, and obtain green pellets. The vulcanization and roasting additives are composed of vulcanizing agent, flux, flux and reducing agent. The vulcanizing agent is pyrite, the flux is quartz, and the flux is It is borax, the reducing agent is anthracite, the amount of vulcanizing agent is twice the sum of the molar numbers of copper and nickel elements contained in the electroplating sludge, the amount of flux is 25% of the dry weight of the electroplating sludge, and the amount of flux is 25% of the electroplating sludge. 1% of the dry weight of the sludge, and the dosage of the reducing agent is...

Embodiment 2

[0034] The object of treatment is electroplating sludge from an electroplating factory in Foshan, Guangdong. The mass percentages of copper and nickel are 5.16% and 3.37% respectively. The following processes are used to treat the electroplating sludge and recover copper and nickel:

[0035] (1) Mix electroplating sludge with vulcanization and roasting additives, pelletize to obtain green pellets, vulcanization and roasting additives are made up of vulcanizing agent, flux, flux and reducing agent, vulcanizing agent is the mixture of pyrite and sulfur (pyrite The mass ratio of ore and sulfur is 3:1), the flux is a mixture of quartz and alumina (the mass ratio of quartz and alumina is 2:1), and the flux is a mixture of borax and sodium silicate (borax and sodium silicate The mass ratio is 1:1), the reducing agent is anthracite, the consumption of vulcanizing agent is 3 times of the sum of the molar numbers of copper and nickel elements contained in the electroplating sludge, and ...

Embodiment 3

[0042] The object of treatment is electroplating sludge from an electroplating factory in Ningbo, Zhejiang. The mass percentages of copper and nickel are 2.87% and 3.05% respectively. The electroplating sludge is treated by the following process, and copper and nickel are recovered:

[0043] (1) Mix electroplating sludge with vulcanization roasting additive, pelletize to obtain raw pellets, vulcanization roasting additive is made up of vulcanizing agent, flux, flux and reducing agent, vulcanizing agent is the mixture of pyrite and sodium sulfide (yellow The mass ratio of iron ore and sodium sulfide is 1:1), the flux is a mixture of quartz and alumina (the mass ratio of quartz and alumina is 1:1), and the flux is a mixture of borax and sodium silicate (borax and silicon The mass ratio of sodium acid sodium is 1:2), the reducing agent is anthracite, the amount of vulcanizing agent is 3 times of the sum of the molar numbers of copper and nickel elements contained in the electropla...

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Abstract

The invention relates to the field of dangerous solid waste environmental-protection treatment and resource regeneration and particularly discloses a method for recycling copper and nickel in treatment of electroplating sludge. According to the method provided by the invention, firstly, the electroplating sludge and sulphidizing roasting additive are mixed and pelletized, and green pellets are obtained; then the green pellets are dried and subjected to sulphidizing roasting at the temperature of 800-1200 DEG C; a roasted product is ground till particles with the particle size being -0.045 mmaccount for 60-80%, and ground ore pulp is obtained; and the ground ore pulp is subjected to flotation and separation, then copper and nickel mixed concentrate is obtained, nonfloat is harmless tailings, the copper and nickel mixed concentrate is ground till particles with the particle size being -0.037 mm account for 90-95%, and flotation is performed so as to obtain a copper concentrate productand a nickel concentrate product. Through the method provided by the invention, treatment of the electroplating sludge is performed through sulphidizing roasting and flotation, valuable elements of the copper and nickel in the electroplating sludge can be comprehensively recycled, the copper concentrate and the nickel concentrate are obtained, the content of heavy metals of the flotation tailingsis lowered remarkably, and the leaching toxicity is lower than the national relevant standard.

Description

technical field [0001] The invention relates to the technical field of hazardous waste treatment and resource regeneration, in particular to a method for treating and recovering copper and nickel from electroplating sludge. Background technique [0002] Electroplating sludge refers to the sediment containing a variety of heavy metals produced during the treatment of electroplating wastewater. These sediments have a high water content, and the heavy metal components have high thermal stability and are easy to migrate, which can easily cause secondary pollution. In 1998, my country included electroplating sludge as a typical example in the "National Hazardous Waste List"; in 2004, the "Administrative Measures for Hazardous Waste Operation Permits (Revised in 2013)" formulated regulations on the collection, storage and disposal of electroplating sludge. Strict regulations to prevent secondary pollution from electroplating sludge. [0003] In recent years, there has been a lot o...

Claims

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Application Information

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IPC IPC(8): C22B1/24C22B1/16C22B23/00C22B15/00B03D1/002B03D1/012B03D1/008B03D101/02B03D101/04
CPCB03D1/002B03D1/008B03D1/012B03D2201/007B03D2201/02B03D2201/04C22B1/16C22B1/2406C22B15/0017C22B23/005Y02P10/20
Inventor 吕昊子陈志强刘勇刘牡丹胡红喜饶金山刘超
Owner 广东省资源综合利用研究所