Method for recycling copper, nickel, chromium, zinc and iron from plating sludge

A technology for electroplating sludge and recovering copper, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of large fluctuation range of metal and impurity content, low economic benefit, long process and so on , to achieve the effect of high utilization rate of metal resources, high added value of products, and low amount of process waste.

Active Publication Date: 2010-02-10
YANGZHOU NINGDA NOBLE METAL CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

Due to its leaching toxicity, it is easy to pollute surface water or groundwater
[0003] In order to reduce pollution, there are also researches on resource utilization of electroplating sludge. The methods include pyro-reduction smelting and wet chemical separation and recovery, etc., but the overall technical level is not high, and there are the following defects: (1) The scale is small and the process disposal chain is not Integrity, low comprehensive utilization rate, if the production waste residue and waste water are not properly disposed of, it is easy to cause secondary pollution
(2) The treatment process is simple, and the adaptability to raw materials is poor. Only those with higher copper and nickel content can be selected for recycling.
(3) Most of them can only produce crude products, and the economic benef...

Method used

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Embodiment Construction

[0059] As shown in Figure 1, the operation steps of the present invention include: acid leaching, sulfide separation and enrichment, hot-press leaching, extraction and purification, chromium hot-press oxidation, chromium solution purification, and extraction of ferric chloride.

[0060] 1. Acid leaching: pump the electroplating sludge containing copper and nickel into the reactor, add sulfuric acid, stir the reaction to control the pH of the system to 0.5~1.0, in order to promote the reaction, add hydrogen peroxide at 15kg / t sludge, the reaction is 2.5~3.0 After one hour, the slurry is sent for filtration and separation to obtain metal leachate and gypsum slag. The leaching rate of copper, nickel, chromium, zinc and iron is greater than 98%.

[0061] The leaching toxicity of gypsum slag after washing meets the standard requirements and can be used as general industrial waste slag treatment.

[0062] 2. Vulcanization separation and enrichment: adjust the acidity of the leachin...

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Abstract

The invention relates to a method for recycling copper, nickel, chromium, zinc and iron from plating sludge, belonging to the technical field of chemical engineering and metallurgy. The method comprises the following steps: acid leaching, vulcanizing for separation and enrichment, hot-pressure leaching, extracting for separation, hot-press oxidizing chromium, purifying chromium solution, extracting ferric chloride and the like. The method has obvious advantages of strong adaptability to different kinds of plating sludge, high utilization of metal resources, high value-added content of product,less process waste residue, thorough deintoxication and the like.

Description

technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, in particular to the technology of recovering metal from electroplating sludge. Background technique [0002] Electroplating sludge is a solid waste that has been neutralized from waste water in the electronics, electroplating, and circuit board surface treatment industries. It has been listed as hazardous waste by the state. Electroplating sludge has a high water content; the particles are fine and muddy; the composition is complex and contains a variety of heavy metal elements such as copper, zinc, nickel, chromium, etc.; metals are mostly endowed in the state of hydroxide, oxide, carbonate, etc. Therefore, the comprehensive utilization of electroplating sludge brings considerable difficulty. Therefore, the current common disposal methods for electroplating sludge are landfill, incineration, solidification, etc., and some of them are directly stacked in the open air. ...

Claims

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Application Information

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IPC IPC(8): C01G37/00C01G49/10C01G9/06C01G3/10C01G53/06C02F11/00
Inventor 樊红杰岳喜龙
Owner YANGZHOU NINGDA NOBLE METAL CO LTD
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