Harmless treatment method for electroplating sludge

Abstract

The invention belongs to the technical filed of environmental protection engineering and particularly relates to a harmless treatment method for electroplating sludge. The harmless treatment method comprises the following steps: the electroplating sludge is taken, certain amount of quicklime and flue gas desulfurization gypsum is added, crushed sufficiently and stirred uniformly, the mixture is left to stand for a period of time, and modified electroplating sludge is obtained; the modified electroplating sludge and fly ash are taken and stirred uniformly, a certain amount of a composite activator is added and stirred sufficiently again, and a mixture is obtained; an electroplating sludge test block is obtained in a pressure forming manner and cured in a room-temperature environment for 7-28 days, and a solidified electroplating sludge body is obtained. The harmless treatment method adopted for treating the electroplating sludge has the advantages of simple process, low cost, large electroplating sludge curing amount, small capacity increase and the like, meanwhile, the solidified electroplating sludge body obtained after treatment is highly corrosion-resistant, stable for a long time and low in heavy metal leaching toxicity, has certain compressive strength and can be taken as general solid waste to be subjected to landfill treatment.

Description

technical field [0001] The invention belongs to the technical field of environmental protection engineering, and in particular relates to a method for harmless treatment of electroplating sludge. Background technique [0002] Electroplating sludge is the discharge produced in the process of electroplating wastewater treatment, which contains a large amount of toxic heavy metals such as chromium, cadmium, nickel, zinc, etc., and its composition is very complex. Among the 47 types of hazardous waste listed in my country's "National List of Hazardous Wastes" (Huanfa [1998] No. 89), electroplating sludge accounts for 7 of them, and is a typical hazardous waste. As far as the country is concerned, about 10 million tons of electroplating sludge are produced every year. At present, due to many problems in my country's electroplating industry, such as many factories, small scale, low level of equipment and low level of pollution control, in quite a few areas, electroplating sludge ...

AI Technical Summary

Problems solved by technology

However, the current curing technology mainly has three problems. First, the curing body has poor corrosion resistance, and there is still a high risk of heavy metals being leached, such as cement and lime curing methods; secondly, the volume increase is obvious, such as cement curing method, The amount of cement can reach dozens of times; then, the curing cost is high and the operation is complicated, such as asphalt, vitrification method

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