Process method for recycling precious metal from electroplating wastewater

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...

AI Technical Summary

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 treatment efficiency is not high. Various metal ions form hydroxide precipitation with different pH ranges, and the actual reaction process is difficult to accurately control, resulting in unstable overall treatment effect; manual operation High strength; a large amount of metal ion-containing sludge is formed, which needs to be outsourced; a large amount of metal ions in the wastewater cannot be recycled, which leads to an increase in the cost of the enterprise, an increase in the cost of the unit product, and a decline in the competitiveness of the enterprise

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