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

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

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

CN101643243BActive Publication Date: 2014-01-15YANGZHOU NINGDA NOBLE METAL CO LTD
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Experimental program
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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

Patent Timeline
15 Jan 2014
Publication
CN101643243B
IPC
C01G37/00; C01G49/10; C01G9/06; C01G3/10; C01G53/06; C02F11/00
Inventors
樊红杰; 岳喜龙