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Method for comprehensive recovery of valuable metals in electroplating sludge

A technology for electroplating sludge and valuable metals, applied in the direction of improving process efficiency, etc., can solve problems such as low yield, high cost, secondary pollution, etc., and achieve high economic and environmental benefits

Inactive Publication Date: 2015-09-23
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a method for comprehensive recovery of valuable metals in electroplating sludge, which solves the problems of high cost, low yield and secondary pollution in the prior art

Method used

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  • Method for comprehensive recovery of valuable metals in electroplating sludge

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Embodiment 1

[0040]Get electroplating sludge 100kg (dry basis, its composition is: Ni is 5.1%, Cu is 5.7%, Cr is 6.3%), joins in the 300L ammonia immersion solution (the concentration of ammonia is 8%), adjusts The temperature was raised to 40°C, stirred for 3 hours, and the filtrate and filter residue were obtained through plate and frame pressure filtration. Add 80L of 10% sodium sulfide to the ammonia leaching filtrate at room temperature, raise the temperature to 80°C and stir for 30 minutes, filter after cooling, wash and dry the filter residue to obtain 8.1kg of crude copper sulfide; add 10% sodium hydroxide to the filtrate at room temperature The solution was 110L, heated to 80°C and stirred for 30 minutes, filtered after cooling, and the filter residue was washed and dried to obtain 9.3kg of crude nickel hydroxide. The ammonia leached filter residue was added to 15% sulfuric acid, and the pH was adjusted to 3.0-3.5 at 50° C., stirred for 90 minutes, and filtered to obtain the filtr...

Embodiment 2

[0041] Embodiment 2: get the electroplating sludge 1000kg (dry base, its composition: Ni is 5.9%, Cu is 5.5%, Cr is 6.6%) of the electroplating sludge of certain electroplating enterprise, joins in 3m 3 In the ammonia immersion solution (the concentration of ammonia is 10%), adjust the temperature to 30° C., stir for 3 hours, and obtain the filtrate and filter residue through plate and frame pressure filtration. Add 550L of 15% sodium sulfide to the ammonia leaching filtrate at room temperature, raise the temperature to 80°C and stir for 30 minutes, filter after cooling, wash and dry the filter residue to obtain 79kg of crude copper sulfide; add 1100L of 10% sodium hydroxide solution to the filtrate at room temperature , heated up to 80°C and stirred for 30 minutes, filtered after cooling, and the filter residue was washed and dried to obtain 91 kg of crude nickel hydroxide. The ammonia leached filter residue was added to 15% sulfuric acid, at 50°C, the pH was adjusted to be b...

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Abstract

The invention discloses a method for comprehensive recovery of valuable metals in electroplating sludge. According to the method, an ammonia leaching-acid leaching combined technology is adopted for recovery of copper, nickel and chromium in the electroplating sludge. The method comprises the following steps: first, leaching copper and nickel in the electroplating sludge with an ammonia leaching solution, recovering cooper with sodium sulfide through precipitation, and recovering nickel with sodium hydroxide through precipitation; then, leaching chromium in the electroplating sludge with sulfuric acid, and recovering chromium with sodium carbonate through precipitation, wherein waste residues remaining after the treatment reach the general solid waste standard. The method has the benefits that the valuable metals in the electroplating sludge can be efficiently recovered, the cost is low, and secondary pollution is avoided.

Description

technical field [0001] The invention belongs to hydrometallurgy comprehensive recovery technology, in particular to a method for comprehensive recovery of valuable metals from electroplating sludge. Background technique [0002] Electroplating sludge refers to the sludge and plating tank sludge produced after the treatment of electroplating wastewater, which is included in the national list of hazardous waste and belongs to the seventeenth category of hazardous waste. [0003] Electroplating sludge contains a large amount of heavy metals and is difficult to degrade. If it is not properly disposed of in the recycling process or directly landfilled without treatment, it will bring greater harm to the environment. At the same time, heavy metals in electroplating sludge are metal resources, which can be recycled and turned into treasures. Taking the electroplating sludge of an electroplating factory as an example, the contents of various metals are: Ni content is 5-8%, Cu conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B23/00C22B34/32C22B26/20
CPCY02P10/20
Inventor 张复兴谭雄文邝代治朱小明
Owner HENGYANG NORMAL UNIV
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