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Harmless disposal and resource utilization method for electroplating sludge

A technology for electroplating sludge and recycling, applied in the direction of improving process efficiency, etc., can solve the problems of difficulty in recycling leaching slag and secondary sedimentation slag, incomplete metal separation, and difficulty in large-scale production, so as to improve quality and additional Value, thorough detoxification, and strong adaptability to environmental factors

Inactive Publication Date: 2016-07-06
HUNAN AIGE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional acid leaching→extraction→electrodeposition, this method formally replaces "acid leaching" with "bacterial leaching", "extraction" with "centrifugal extraction", and "electrodeposition" with "cycloelectric deposition". It only has certain advantages in improving the leaching rate, reducing acid consumption, and reducing energy consumption, but there is no essential difference in the harmless degree of sludge and the recovery of valuable metals. The leaching slag and secondary sedimentation slag Recycling is difficult, there are hidden dangers of secondary pollution, and the separation of metals is not complete, and the by-products have low purity and low value
In addition, due to the high cost of equipment and maintenance in this process, there are still certain difficulties in large-scale production

Method used

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  • Harmless disposal and resource utilization method for electroplating sludge
  • Harmless disposal and resource utilization method for electroplating sludge
  • Harmless disposal and resource utilization method for electroplating sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The raw material used is electroplating sludge produced by a wastewater treatment plant in an electroplating park in Guangdong, and its chemical composition is shown in Table 1.

[0033] Table 1 Example 1 dry base electroplating sludge main chemical composition

[0034] the element

Cr

Ni

Zn

Cu

Fe

Na

Content %

2.83

7.28

0.29

1.70

0.89

0.404

[0035] A process for harmless disposal and resource utilization of electroplating sludge containing chromium, iron, nickel, copper and zinc, comprising the following steps:

[0036] (1) The microorganisms used for leaching are Ferroplasma acidiphilum, Acidithiobacillus ferrivorans, Acidithiobacillus ferrooxidans, Leptospirilum ferriphilum, acidophilus Sulfobacillus acidophilus and Ferroplasmathermophilum are mixed cultures obtained by domestication in the corresponding electroplating sludge system at 30°C.

[0037] (2) The bioleaching process is carried out in a 1...

Embodiment 2

[0051] The raw material used is electroplating sludge discharged from an electroplating factory in Shenzhen, and its chemical composition is shown in Table 5.

[0052] Table 5 Example 2 The main chemical components of dry base electroplating sludge

[0053] the element

Cr

Ni

Zn

Cu

Fe

Na

Content %

3.26

2.45

1.75

2.95

7.73

0.11

[0054] A process for harmless disposal and resource utilization of electroplating sludge containing chromium, iron, nickel, copper and zinc, comprising the following steps:

[0055] (1) The microorganisms used for leaching are Ferroplasmaacidiphilum, Leptospirillum ferriphilum, Sulfobacillusacidophilus, and Ferroplasmathermophilum, which were passed through 45 The mixed culture acclimatized in the corresponding electroplating sludge system under the condition of ℃.

[0056] (2) The bioleaching process is carried out in an 800L stirred reactor with temperature control, 227.3kg of sludg...

Embodiment 3

[0070] The raw material used is electroplating sludge discharged from an electroplating factory in Xiangtan City, Hunan Province, and its chemical composition is shown in Table 9.

[0071] Table 9 Example 3 dry base electroplating sludge main chemical composition

[0072] the element

Cr

Ni

Zn

Cu

Fe

Na

Content %

0.92

0.38

10.42

1.56

10.40

0.65

[0073] A process for harmless disposal and resource utilization of electroplating sludge containing chromium, iron, nickel, copper and zinc, comprising the following steps:

[0074] (1) The microorganisms used for leaching, Ferroplasmaacidiphilum, Leptospirillum ferriphilum and Ferroplasmathermophilum, are passed through the corresponding electroplating sludge system at 50°C Mixed cultures acclimated in .

[0075] (2) The bioleaching process is carried out in a 500L stirred reactor with temperature control, 151.5kg of sludge is added, the moisture content of the sludg...

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Abstract

The invention provides a harmless disposal and resource utilization new technology for electroplating sludge and particularly for complex electroplating sludge rich in copper, iron, nickel, zinc and chromium. Selected microorganisms are high in adaptation to the electroplating sludge and good in leaching performance; one-step extraction is adopted to extract copper, iron and zinc, follow-up nickel and chromium separation and purification are facilitated, in the whole technology, the iron cannot form any solid phase, and the problem that according to an existing reported technology, during iron separation, entrainment is serious or iron precipitation is not thorough is solved; a metallurgical method is adopted to carry out separating and recycling on extraction raffinate, the separation effect is good, and an obtained product is high in purity; and according to the technological process, cleaning and efficient high-value recycling of valuable metal in the electroplating sludge are achieved, the method is high in adaptation to various kinds of electroplating sludge, the electroplating sludge meets the harmless requirement, and the method extremely has the industrialized utilization value.

Description

technical field [0001] The invention relates to the field of harmless disposal of industrial hazardous waste and resource utilization of valuable metals, in particular to a method for harmless disposal and resource utilization of electroplating sludge containing chromium, iron, nickel, copper and zinc. Background technique [0002] At present, the comprehensive utilization and treatment and disposal technologies of electroplating sludge mainly include smelting technology, ammonia water leaching technology, sulfuric acid (ferric sulfate) leaching technology, etc. The smelting technology is suitable for chemical treatment of electroplating sludge containing cyanide, chromium, nickel, copper, cadmium and deplating wastewater; ammonia leaching technology is suitable for the treatment of copper, nickel and other heavy metal wastewater treatment sludge ; Sulfuric acid (ferric sulfate) leaching technology is suitable for the treatment of copper, nickel and other heavy metal wastewa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00C22B34/32C22B19/30C22B19/20C22B15/00
CPCC22B7/007C22B15/0071C22B15/0086C22B15/0089C22B19/22C22B19/30C22B23/043C22B23/0461C22B34/32Y02P10/20
Inventor 赵邵安周文博仉丽娟张著秦红秦荣钢
Owner HUNAN AIGE ENVIRONMENTAL PROTECTION TECH CO LTD
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