Technique for safe reducing treatment of electroplating sludge

Abstract

The invention belongs to the technical field of environment protection engineering, and particularly relates to a technique for safe reducing treatment of electroplating sludge. The technique includes following steps: taking the electroplating sludge, breaking and stirring to be thick, and performing alkaline leaching in heating and pressurizing states to obtain leachate A and residue A; taking the residue A, and performing acidic leaching in the heating and pressurizing states to obtain leachate B and residue B, wherein the leachate A and the leachate B can be used for metal smelting by means of conventional hydrometallurgy, and the residue B can be directly subject to landfill treatment. By the technique, the electroplating sludge can be reduced by more than 90%, removal rate of heavy metals reaches higher than 95%, total amount of heavy metals of the residue B after treatment can meet industrial land requirements stipulated in 'Soil Environment Quality Standards', and the residue B can be directly subjected to landfill treatment. The technique has the advantages of being safer, more efficient and more thorough than conventional methods of solidifying, stabilizing and extraction.

Description

technical field [0001] The invention belongs to the technical field of environmental protection engineering, and in particular relates to a process method for safe and volume-reducing disposal 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. 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, most of the electroplating sludge is still simply landfilled, solidified, or even randomly piled up. Heavy metals can enter soil a...

AI Technical Summary

Problems solved by technology

At present, due to many problems in my country's electroplating industry, such as many factories, small scale, low equipment level and low pollution control level, most of the electroplating sludge is still simply landfilled, solidified, or even randomly piled up. Heavy metals can enter soil and water bodies through various channels, causing serious environmental damage, and can even further enter the food chain, posing a serious threat to animal, plant and human health

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