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Method for recovering valuable metal in electroplated mud

A technology for electroplating sludge and valuable metals, applied in the direction of improving process efficiency, can solve the problems of failure to recover metals, copper salts containing many impurities, etc., to achieve environmental benefits, social and economic benefits, and resource The effect of recycling

Inactive Publication Date: 2009-10-07
福建省科辉环保工程有限公司
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Problems solved by technology

This method has a simple process and does not add other reagents, but the recovered copper salt contains more impurities, and metals other than copper cannot be recovered.

Method used

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  • Method for recovering valuable metal in electroplated mud

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Embodiment Construction

[0028] Such as figure 1 Shown is a preferred embodiment of the present invention.

[0029] The first step is acid hydrolysis. Add H to the electroplating sludge first 2 SO 4 、H 2 O etc. for acid hydrolysis.

[0030] The second step is to filter and clarify. Specifically, press filtration and then sedimentation for clarification. The filtrate A of the press filter is settled and clarified, and the clear liquid A enters the drying field in the third step to concentrate, and the cloudy solution after settling and clarification is returned to the acidolysis solution of the electroplating sludge to be repeatedly soaked and recovered, and the filter residue of the press filter is washed with water for a second time. The obtained waste residue can be used for burning bricks, and the washing solution is also returned to the acid solution of the electroplating sludge for repeated soaking and recovery to improve the metal recovery rate.

[0031] The third step is to concentrate i...

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Abstract

This invention has publicized one kind of method of galvanization sludge valuabl emetal recycling, first, acidolysis the galvanization sludge, filter and clarify, then condense serum A onsunning ground, then, responded the concentrated solution with duplicate salt, crystallization separated the mixture crystal of copper ion and nickel ion, continue to concentrate filtrate B, by responding again with duplicate salt, the concentrated solution crystaled and separated chromium ion crystal. This invention craft is simple, equipment invest few, energy consumption is extremely low, both recycle the precious metal resources and is advantageous to government pollution, it realize resources circulation using, it also realize the environment benefit, social and economic efficiency unification.

Description

technical field [0001] The invention relates to a method for recovering valuable metals in electroplating sludge, which belongs to the environmental protection engineering technology. Background technique [0002] At present, the research and application methods for the recovery and utilization of valuable metals in electroplating sludge are as follows: [0003] 1. Solvent extraction method: In the 1970s, Sweden proposed the H-MAR and Am-MAR "leaching-solvent extraction" processes, which made the recovery rate of copper, zinc and nickel in electroplating sludge reach 70%, and industrialization has been formed Scale; the United States improved on the basis of this process, so that the recovery rate of copper and nickel reached more than 90%; Zhu Wanpeng and others in my country improved on this basis, using ammonia complex group leaching-ammonia steaming-hydrolyzed slag acid leaching -Solvent extraction-crystallization separation process recovers valuable metals in electroplat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/06C22B3/20
CPCY02P10/20
Inventor 史凤烟杨文森
Owner 福建省科辉环保工程有限公司
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