Process method for recycling precious metal from electroplating wastewater

A technology of electroplating wastewater and process methods, applied in the field of recycling precious metals, can solve problems such as declining competitiveness of enterprises, high treatment costs, and polluting the environment, and achieve the effects of low water treatment costs, reduced environmental pollution, and convenient system operation

Inactive Publication Date: 2010-08-18
NANTONG SHENHAI SCI & IND TECHCO
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  • Abstract
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Problems solved by technology

Before the technical transformation of nickel and copper recovery and water recycling projects, 300,000 tons of nickel electroplating rinsing wastewater and 150,000 tons of copper acid plating and electroplating wastewater were produced every year during the production process. Traditional chemical methods were used to treat them, which cost high and were not recycled. The treated water is directly discharged, polluting the environment
The current treatment station is mainly based on multi-step physical and chemical precipitation process, and the treatme

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  • Process method for recycling precious metal from electroplating wastewater
  • Process method for recycling precious metal from electroplating wastewater
  • Process method for recycling precious metal from electroplating wastewater

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[0015] by figure 1 with 2 As shown, a process method for recovering precious metals from electroplating wastewater of the present invention puts the wastewater into a collecting tank, and then uses a lifting device to lift the wastewater to the next step, and further includes the following steps:

[0016] Electroplating wastewater pretreatment step: the electroplating wastewater is passed through a quartz sand filter, an activated carbon filter and a filter element filter to remove impurities, and the filtrate enters the next step;

[0017] Membrane concentration step: Put the filtrate obtained in the previous step into the membrane bioreactor for stepwise concentration and separation. The permeate is collected in the permeate pool and used as the rinsing water in the electroplating pipeline; the concentrate enters the concentrate tank, and Recycle to plating tank or electrolytic recovery of nickel.

[0018] Each level of filtration membrane in the above-mentioned membrane bioreactor...

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Abstract

The invention relates to a process method for recycling precious metal from electroplating wastewater. Wastewater is placed into a collecting basin, then a hoisting device is utilized to hoist the wastewater to the next process, and the process method is characterized by also including the following steps: electroplating wastewater pre-treatment, namely the electroplating wastewater sequentially passes through a quartz sand filter, an active carbon filter and a filter element type filter to remove impurities, and filtration is subject to the next process; membrane concentration, namely the filtration obtained in the previous step is added into a membrane bioreactor for carry out step by step concentration separation, permeate is collected to a permeate water tank and is used as water for poaching in electroplating production line; concentrated solution enters into a concentrated solution water tank and is recycled in a plating tank, or electrolysis is carried out to recycle nickel. The invention has the advantages that: sewage discharge of the traditional electroplating industry can be reduced, harmful heavy metal in wastewater can be recycled, thus reducing environmental pollution; and water treatment is low in cost, and economic benefit is considerable.

Description

technical field [0001] The invention relates to a process method for recovering precious metals from electroplating wastewater, which belongs to the field of wastewater treatment. Background technique [0002] Process wastewater in electroplating production, including pickling section, water washing section, degreasing section, etc., in addition to ground washing wastewater, ground washing water, domestic sewage, etc. Before the technical transformation of nickel and copper recycling and water recycling projects, 300,000 tons of nickel electroplating rinsing wastewater and 150,000 tons of copper acid plating and electroplating wastewater are produced every year during the production process. Traditional chemical methods are used to treat them, which cost high and are not recycled. The treated water is discharged directly, polluting the environment. The current treatment station is mainly based on multi-step physical and chemical precipitation process, and the treatment effi...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/44C02F1/28C02F103/16
Inventor 陶云峰仇士学
Owner NANTONG SHENHAI SCI & IND TECHCO
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