Heavy-metal-containing electroplating wastewater treatment and heavy metal recycling method

Abstract

The invention discloses a heavy-metal-containing electroplating wastewater treatment and heavy metal recycling method, which includes the following steps: low-concentration electroplating wastewater containing heavy metal ions is led to pass through ion exchange resin, the heavy metal ions contained in the electroplating wastewater are led to be completely absorbed by the ion exchange resin, and clean water is extracted until absorption of the ion exchange resin reaches saturation; eluent is added to lead the heavy metal ions absorbed by the ion exchange resin to be separated from the the ion exchange resin so as to produce high-concentration electroplating wastewater; a reductant is then added to the high-concentration electroplating wastewater for reduction reaction to obtain water-insoluble reduction products containing heavy metal ions; a flocculant is added to accelerate coagulation of the reduction products; finally, the methods such as filtration and centrifugation are adopted to separate sediment, and heavy metal materials are recycled through high-temperature calcinations to serve as useful industrial raw materials. The heavy-metal-containing electroplating wastewater treatment and heavy metal recycling method has the advantages of being low in cost, high in efficiency, strong in universality and the like, effectively reduces secondary pollution, and is suitable for being widely used in the electroplating and electronic industries.

Description

[0001] technical field [0002] The invention relates to the technical field of electroplating wastewater treatment, in particular to a method for treating electroplating wastewater containing heavy metals and recycling the heavy metals. [0003] Background technique [0004] The electroplating industry is an important processing industry in my country. At present, galvanizing, copper plating, cadmium plating, nickel plating and chrome plating are mainly used, and they are concentrated in the industrial fields of machine manufacturing, light industry, electronics, aerospace and instrumentation. It is understood that the national electroplating industry discharges more than 400 million tons of wastewater containing heavy metals every year, leading to serious pollution of rivers, lakes and seas. In recent years, electroplating wastewater treatment mainly only meets the increasingly stringent environmental protection requirements. [0005] At present, the commonly used electr...

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Problems solved by technology

[0006] 1. Generally, the concentration of heavy metals in electroplating wastewater is low, and the amount of water treatment is large, resulting in a large dosage of chemicals and easy to cause secondary pollution;

[0007] 2. The process and equipment occupy a large area, and the operating cost and fixed investment are relatively large;

[0008] 3. The process operation is complicated, the process conditions are unstable, and the operation is difficult to control;

[0009] 4. The treatment method of these heavy metal wastewater is a kind of pollution transfer, which converts the dissolved heavy metals in the wastewater into precipitation or a form that is easier to handle. These substances are disposed of in landfills. The harm of heavy metals to the environment still exists for a long time, often Pollution of groundwater and surface water, and the treatment of these pollution needs to pay a higher price

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