Extraction method and equipment for extracting and recycling heavy metals in electroplating sludge

A technology of electroplating sludge and extraction equipment, which is applied in the direction of chromate/dichromate, etc., can solve the problems of small footprint, and achieve the effect of small footprint, easy operation and stable operation

Active Publication Date: 2022-04-08
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, for the resource treatment of electroplating sludge, most of the technologies for extracting heavy metals are in the laboratory stage, including leaching extraction, fire extraction, electrolysis, etc.; but there is no one that can extract heavy metals in electroplating sludge. In order to meet the social needs of electroplating sludge for recycling, it is urgent to provide a heavy metal extraction and recovery equipment that can adapt to the extraction of heavy metals from different types of electroplating sludge, has a high extraction rate, a small footprint, and is easy to operate. Equipment and processing method

Method used

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  • Extraction method and equipment for extracting and recycling heavy metals in electroplating sludge
  • Extraction method and equipment for extracting and recycling heavy metals in electroplating sludge
  • Extraction method and equipment for extracting and recycling heavy metals in electroplating sludge

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Embodiment 1

[0041] like figure 1 Shown is an extraction equipment for the extraction and recovery of heavy metals from electroplating sludge, including a first treatment device 1 for separating electroplating sludge and heavy metals, and a second treatment for step-by-step extraction of heavy metals arranged under the first treatment device 1 device 2;

[0042] like figure 1 , 2 As shown, the first treatment device 1 includes a leaching treatment tank 10, a sludge inlet 11 arranged at the upper end of the leaching treatment tank 10, a medicine extrusion adding port 12, a mechanical agitator 13 arranged inside the leaching treatment tank 10, and a uniform ring arrangement The ultrasonic assembly 14 on the inner wall of the leaching treatment tank 10, the suction filter separator 15 arranged below the leaching treatment tank 10;

[0043] The second treatment device 2 comprises a composite extraction tank 20 connected with the suction filter separator 15, a stirring drum 21 arranged on th...

Embodiment 2

[0049] The difference with embodiment 1 is:

[0050] like image 3 As shown, the suction filter separator 15 includes a cylindrical separation chamber 150 arranged below the leaching treatment tank 10, and a negative pressure assembly 151 arranged below the cylindrical separation chamber 150; the connection between the lower end of the cylindrical separation chamber 150 and the negative pressure assembly 151 is provided with a A sludge interception net 152, a baffle 153 is movable at the connection between the upper end of the cylindrical separation chamber 150 and the leaching treatment tank 10; a rotating mud sweeper 158 is movable installed inside the cylindrical separation chamber 150; a mud discharge is provided on the side wall of the cylindrical separation chamber 150 Mouth 154.

[0051] like Image 6 As shown, the negative pressure assembly 151 includes a conical connecting pipe 155 connected to the first sludge intercepting net 152 at one end, a negative pressure de...

Embodiment 3

[0054] The difference with embodiment 1 is:

[0055] like figure 1 As shown, the second processing device 2 includes a composite extraction tank 20 connected to the negative pressure assembly 151, a stirring drum 21 arranged on the inner side wall of the composite extraction tank 20, and a heavy metal extraction core 22 arranged at the center of the composite extraction tank 20;

[0056] like Figure 4 , 5 As shown, the heavy metal extraction core 22 includes a mounting frame 220 arranged at the center of the composite extraction tank 20, a filter cartridge 221 arranged at the center of the mounting frame 220, an electrodeposition tank arranged on the mounting frame 220 and located at both sides of the filter cartridge 221 23. The pumping leaf fan 223 installed in the inner center of the filter cartridge 221; the upper end of the filter cartridge 221 is provided with a liquid discharge port 224 connected with the pumping leaf fan 223; the power module for driving the pumping...

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Abstract

The invention relates to the technical field of electroplating sludge treatment, in particular to an extraction method and equipment for extracting and recycling heavy metals in electroplating sludge. The extraction method comprises the following steps: mixing electroplating sludge and a sodium hydroxide solution according to a certain proportion, and performing ultrasonic treatment; then adding an oxidant solution, and continuously reacting under the ultrasonic action; separating the electroplating sludge from the leachate by adopting a suction filtration separator; then adjusting the pH value of the leaching solution to generate a precipitate; then filtering and recovering precipitates through a heavy metal extraction core to obtain a sodium chromate solution; the extraction equipment comprises a first treatment device and a second treatment device, the first treatment device comprises a leaching treatment tank, a mechanical stirrer, an ultrasonic assembly and a suction filtration separator; the second treatment device comprises a composite extraction tank, a stirring drum and a heavy metal extraction core; according to the technical scheme, the extraction rate is high and stable, the occupied area is small, the sludge treatment efficiency is high, and the industrial production requirements of electroplating enterprises can be met.

Description

technical field [0001] The invention relates to the technical field of electroplating sludge treatment, in particular to an extraction method and equipment for extracting and recovering heavy metals from electroplating sludge. Background technique [0002] Electroplating sludge is a precipitate mainly composed of heavy metal hydroxides such as copper and chromium produced during the treatment of electroplating wastewater, and its composition is complex. Due to the large amount of electroplating wastewater, complex composition, high COD, and high content of heavy metals, if it is discharged without treatment, it will cause serious environmental pollution. During the treatment of electroplating wastewater, a large amount of electroplating sludge will also be formed. These electroplating sludges have the characteristics of high water content, high thermal stability of heavy metal components and easy migration. If not handled properly, it is easy to cause secondary pollution. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/32C22B1/00C01G37/14
CPCY02P10/20
Inventor 黄凯华胡小英温勇杜建伟王李张政张明杨段振菡贺框任艳玲
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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