Technique for safe reducing treatment of electroplating sludge

A technology of electroplating sludge and process methods, applied in water/sludge/sewage treatment, pyrolysis treatment of sludge, chemical instruments and methods, etc., can solve the problems of low pollution control level, low equipment level, environmental damage, etc. Achieve the effect of solving environmental pollution problems, wide application range and simple process

Inactive Publication Date: 2016-12-07
SAFECLEEN TECH
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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,

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  • Technique for safe reducing treatment of electroplating sludge
  • Technique for safe reducing treatment of electroplating sludge
  • Technique for safe reducing treatment of electroplating sludge

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Embodiment 1～9

[0038] A process method for safe and reduced-volume disposal of electroplating sludge, comprising the following steps:

[0039] (1) Electroplating sludge pretreatment: take electroplating sludge (water content 65%), use a powerful mixer to crush it and stir it until it is sticky, and it can pass through a 200-mesh sieve;

[0040] (2) Take the viscous electroplating sludge obtained in step (1), add NaOH solution with a concentration of 4 to 6mol / L, the liquid-solid ratio of NaOH solution and electroplating sludge is 5:1, and then place it in a high-pressure reactor React at 100-170°C for 30-60 minutes. After the reaction is complete, carry out suction filtration to obtain leachate A and residue A respectively;

[0041] (3) Take the remaining residue A of step (2), add HCl solution with a concentration of 5-7mol / L, the liquid-solid ratio of HCl solution and residue A is 7:1, and then place it in an autoclave at 120-160 The reaction was carried out at ℃ for 50-80 minutes. After ...

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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...

Claims

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Application Information

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IPC IPC(8): C02F11/10C02F103/16
CPCC02F11/10C02F2103/16C02F2301/08C02F2303/06
Inventor 薛强郑好张峻清李立陈益人
Owner SAFECLEEN TECH
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