Harmless treatment method for electroplating sludge

A technology of harmless treatment and electroplating sludge, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of high curing cost, poor corrosion resistance of solidified body, complicated operation, etc., and achieve solidification The effect of large quantity, strong corrosion resistance and simple process

Active Publication Date: 2016-09-21
SAFECLEEN TECH
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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;

Method used

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  • Harmless treatment method for electroplating sludge
  • Harmless treatment method for electroplating sludge

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Example

[0032] Examples 1~4

[0033] A method for the harmless treatment of electroplating sludge includes the following steps:

[0034] (1) Electroplating sludge pretreatment: Take the electroplating sludge, add 5% quicklime and 5% desulfurized gypsum of the electroplating sludge mass, fully crush and stir evenly, and stand for 24 hours to obtain modified electroplating sludge. The moisture content of the modified sludge is 55%;

[0035] (2) Take modified electroplating sludge and fly ash (particle size 74μm), the mass ratio of the two is 1.54~3.49:1, stir evenly, then add a certain amount of composite activator, composite activator and total material ( The mass ratio of modified electroplating sludge and fly ash) is 0.15~0.25:1, and Na in the composite activator 2 SiO 3 The concentration of KOH is 5mol / L and the concentration of KOH is 2.5mol / L. Stir fully again to obtain the mixture;

[0036] (3) Take the mixture obtained in step (2) and adopt a pressure forming method to prepare an elect...

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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 ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B20/02C04B18/04
CPCY02W30/91C04B28/006C04B20/023C04B2111/00017C04B2111/00767C04B18/08C04B22/08C04B22/062C04B18/0481
Inventor 薛强郑好张峻清李立陈益人
Owner SAFECLEEN TECH
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