Treatment method for electroplating sludge

Abstract

The invention discloses a treatment method for electroplating sludge, comprising the following steps of: a) mechanically dewatering the electroplating sludge; b) drying the mechanically-dewatered electroplating sludge, to obtain a dried material; and c) mixing the dried material, a slag forming agent, a reducing agent and a solvent to obtain the mixed material, and smelting the mixed material under the temperature of 1200-1350 DEG C, so that metal melt and slag can be obtained. The treatment method for the electroplating sludge according to embodiments of the invention adopts mechanical dewatering, so that the sludge drying energy consumption can be reduced, and the problems that the current electroplating sludge treatment is high in energy consumption and bad in economic benefit can be solved; the metal is enriched by a smelting technology, so that the treatment method is high in metal recovery rate; and the waste slag can be sold to the cement industry, the zero discharge of wastewater can be realized, and the waste gas is processed by adopting an active carbon absorbing process, a cloth bag dedusting process and an alkaline water washing process, so that the requirement of the industrial policy can be met, and the cleaning recovery of the electroplating sludge can be realized.

Description

technical field [0001] The invention relates to a treatment method of electroplating sludge. Background technique [0002] Electroplating sludge is the discharge produced during the treatment of electroplating wastewater, which contains a large amount of toxic heavy metals such as chromium, cadmium, copper, nickel, zinc, etc., and its composition is very complex. It is included in the seventeenth category of hazardous waste in the national hazardous waste list . [0003] The electroplating sludge treatment technologies mainly include: ① Stabilization / solidification method, this technology is to use cement and fly ash to treat and solidify the electroplating heavy metal sludge, and then landfill or make bricks. ②Wet treatment, the wet method uses chemical reagent precipitation and freeze separation technology to separate some valuable copper ions in the electroplating sludge in the form of copper sulfate, and extracts nickel ions and other heavy metal ions by adding an extra...

AI Technical Summary

Problems solved by technology

However, due to the high water content of electroplating sludge, the smelting furnace has high requirements on the water content of the incoming materials, and the energy consumption of dehydration is high, resulting in mediocre economic benefits.

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