Processing method and device for recovering precious metals contained in electroplating wastewater

Abstract

The invention provides a processing method for recovering precious metals contained in electroplating wastewater and realizing zero draining, comprising the following steps of: preprocessing the electroplating wastewater; carrying out two-stage resin adsorption; carrying out safety filtration; carrying out ultrafiltration; carrying out reverse osmosis; carrying out activated carbon fiber adsorption; and processing a resin mixed bed. The invention also provides a processing device for recovering the precious metals contained in the electroplating wastewater, comprising a plurality of stages of rinsing channels and a pipeline which are arranged on an electroplating production line, wherein overfalls positioned on the top of the first-stage rinsing channel is connected with a collecting tank through the pipeline; the collecting tank is provided with a medicine addition device; and the outlet end of the collecting tank is sequentially connected with a preprocessing filtering machine, a resin adsorption drum, a safety filter, a reverse osmosis membrane assembly, a carbon fiber filter and the resin mixed bed. In the invention, processed pure water is returned to the rinsing channels for recycling by adopting an efficient adsorbing material and membrane osmosis combination technology, the precious metals contained in the electroplating wastewater are completely recovered, elemental metals or concentrates and crystallizes are reduced into metal salt through extraction and backextraction, the recovery processing and the zero draining of the electroplating wastewater are realized.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment and environmental protection, and relates to the treatment of electroplating wastewater, in particular to a method and device for recovering precious metals in electroplating wastewater and zero discharge of water treatment. Background technique [0002] Electroplating is a common method of metal surface treatment. Metal surface electroplating treatments are mainly galvanized, copper-plated, chrome-plated, and nickel-plated, and are concentrated in machine manufacturing, light industry, electronics, aerospace, electronic instruments and other industrial fields. At present, the treatment process of electroplating wastewater in the electroplating industry is still designed in accordance with the technical indicators of "standard discharge" stipulated by the environmental protection department. Nevertheless, the electroplating industry will still discharge about 4 billion tons of elec...

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Problems solved by technology

[0003] The present invention provides a treatment method and device for recovering precious metals in electroplating wastewater, through which measures such as pretreatment, two-stage resin adsorption, filtration, ultrafiltration, and treatment of rev...

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