A method for harmless treatment and high-value utilization of copper-containing sludge

A harmless treatment, copper sludge technology, applied to the improvement of process efficiency, instruments, optics, etc., can solve the problems of poor washing effect, large environmental pollution, difficult solid-liquid separation, etc., to avoid the formation of colloids and reduce complex Good process and dehydration performance

Active Publication Date: 2018-09-18
HUNAN AIGE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods have high energy consumption, great environmental pollution and are not suitable for the treatment of low-content heavy metal sludge
[0004] (2) chemical treatment method, patent CN100402676C discloses a kind of " method for recovering valuable metals from electroplating sludge ", electroplating sludge is leached out valuable metals with acid, and sodium sulfide is added to the leaching solution to deposit copper to obtain copper sulfide, but acid High consumption, extremely difficult solid-liquid separation, poor washing effect, low total recovery rate of copper
However, in the harmless treatment process of the above-mentioned patents, there is still a problem that organic matter inhibits the growth of microorganisms

Method used

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  • A method for harmless treatment and high-value utilization of copper-containing sludge
  • A method for harmless treatment and high-value utilization of copper-containing sludge
  • A method for harmless treatment and high-value utilization of copper-containing sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The copper-containing sludge produced in the sewage treatment process of a printed circuit board enterprise in Hunan has a water content of 75% after pressure filtration, and its main components include a mixture of copper, iron, calcium hydroxide and sulfate. It contains a small amount of quartz, copper sulfide, and iron sulfide. The main element analysis results of the copper-containing sludge are shown in Table 1-1.

[0056] Table 1-1: Analysis results of main elements of copper-containing sludge on dry basis in Example 1

[0057] element

Cu

Fe

Ca

Si

Al

Ni

Zn

mn

Cr

Pb

sn

content(%)

9.45

25.33

8.42

0.5

0.02

0.003

0.044

0.07

0.015

0.001

0.037

[0058] a kind of like figure 2 The method for harmless treatment and high-value utilization of copper-containing sludge of the present invention includes the following steps:

[0059] (1) Pretreatment of copper-containing sludge: G...

Embodiment 2

[0073] The copper-containing sludge produced in the sewage treatment process of a surface treatment company in Jiangsu has a water content of 68% after pressure filtration. The main components are shown in Table 2-1, and the copper phase distribution is shown in Table 2-2.

[0074] Table 2-1: Analysis results of main elements of copper-containing sludge on dry basis in Example 2

[0075] element

Cu

Fe

Ca

Si

Al

Mg

mn

Na

Ni

Pb

Zn

Cr

content(%)

14

19.05

12.16

0.026

0.227

1.578

0.21

0.235

0.089

0.002

0.001

0.001

[0076] Table 2-2: Phase distribution of dry base copper in Example 2

[0077] Phase

free copper oxide

bound copper oxide

native copper sulfide

secondary copper sulfide

total copper

content(%)

8.94

5

0.01

0.05

14

Proportion(%)

63.86

35.71

0.07

0.36

100

[0078] a kind of like figure 2 The me...

Embodiment 3

[0093] The copper-containing acidic water of a printed circuit board enterprise in Guangdong precipitated most of the heavy metals by lime precipitation, and the water content of the settled copper-containing sludge was 65% after pressure filtration. The main components are shown in Table 3-1, and the phase distribution of copper As shown in Table 3-2.

[0094] Table 3-1: Analysis results of main elements of copper-containing sludge on dry basis in Example 3

[0095]

[0096] Table 3-2: Phase distribution of dry base copper in Example 3

[0097] Phase

free copper oxide

bound copper oxide

native copper sulfide

secondary copper sulfide

total copper

content(%)

5.14

3.5

0.24

3.77

12.65

Proportion(%)

40.63

27.67

1.90

29.80

100.00

[0098] a kind of like figure 2 The method for harmless treatment and high-value utilization of copper-containing sludge of the present invention includes the following st...

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Abstract

The invention discloses a method for harmless treatment and high-value utilization of copper-containing sludge. Copper products are obtained after primary leaching, secondary leaching and extraction electrowinning. The invention cleverly couples the two-stage leaching of heavy iron and copper-containing sludge, has good dehydration performance, improves filtration performance, reduces the influence of impurities on the copper extractant, is beneficial to the stable control of the copper extraction process, and solves the problem of high-iron copper-containing sludge leachate The concentration of iron ions in the medium is much higher than that of copper ions, so that the impurities in the copper-rich solution obtained after extraction are lower, and it is easier to obtain high-quality cathode copper; two-stage leaching is adopted, and the high concentration is greatly reduced after one-stage leaching The inhibitory effect of copper ions on the sulfur-iron oxidizing microorganisms in the secondary leaching is conducive to the deep extraction of various complex forms of copper in the primary leaching slag of copper-containing sludge in a short period of time by microorganisms, and realizes The high-value utilization of the harmless treatment products of copper-containing sludge is realized.

Description

technical field [0001] The invention belongs to the field of harmless disposal and resource utilization of hazardous waste, and in particular relates to a method for harmless treatment and high-value utilization of copper-containing sludge. Background technique [0002] Copper-containing sludge is mainly the final product in the wastewater treatment process of surface treatment industry, printed circuit board industry, electroplating industry and wire and cable industry, which often contains a large amount of heavy metal hydroxides and sulfides, which is an unstable If it is not disposed of properly, it will easily cause serious pollution to soil or groundwater, and it is classified as hazardous waste. It is listed as HW17 and HW22 in the "National Hazardous Waste List (implemented from August 1, 2016)". Its collection, treatment, Storage, transportation, transfer, and disposal should follow the relevant national regulations on hazardous waste management. Since the metallic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C22B3/18C22B3/30C25C1/12
CPCC22B3/18C22B7/007C22B15/0071C25C1/12C22B3/30Y02P10/20
Inventor 周洪波赵邵安周文博陈军辉秦荣钢
Owner HUNAN AIGE ENVIRONMENTAL PROTECTION TECH CO LTD
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