Method for recycling heavy metal in electroplating sludge

A technology for electroplating sludge and recycling, which can be used in the improvement of process efficiency, photography technology, instruments, etc., and can solve problems such as undisclosed manganese.

Active Publication Date: 2012-10-10
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although this method proposes to use bioleaching to extract manganese in manganese slag, it does not disclose how to process electrolytic man...

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  • Method for recycling heavy metal in electroplating sludge

Examples

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Embodiment 1

[0045] (Example 1, resource recycling of copper in electroplating sludge)

[0046] The electroplating sludge treated in this example is taken from the electroplating factory, and its appearance is gray, and the copper content is the majority. As the copper-containing electroplating sludge, the water content is about 70%. The various metal components in the electroplating sludge are shown in Table 1.

[0047] Table 1 The contents of various metals in electroplating sludge mg / g

[0048]

[0049] The method for resource recycling of electroplating sludge comprises the following steps:

[0050] ① Pretreatment of electroplating sludge. Centrifuge and dehydrate the electroplating sludge to be treated. After dehydration, the moisture content of the sludge is 30% to 40%. In the embodiment, it is a sieve of 300 mesh), and sieve to remove large particles and large sand particles; collect the sieved sludge, place it in an oven and dry it at 105°C until the sludge has a constant wei...

Embodiment 2

[0089] (Example 2, resource recovery of nickel in electroplating sludge)

[0090] The electroplating sludge treated in this example is taken from the electroplating factory, and its appearance is reddish brown. Compared with the usual electroplating sludge, the nickel content is in the majority, and the nickel content is greater than 5%. As nickel-containing electroplating sludge, the total content of various metals is 30.37 wt%, and the moisture content is about 68wt%. The various metal components in the electroplating sludge are shown in Table 2. in,

[0091] Table 2 The wt% of various metals in nickel-containing electroplating sludge

[0092]

[0093] The method for resource recycling of electroplating sludge comprises the following steps:

[0094] ① Pretreatment of electroplating sludge. The nickel-containing electroplating sludge to be treated is centrifugally dehydrated, and the moisture content of the sludge after dehydration is 30% to 40%; the sludge after centr...

Embodiment 3

[0123] (Example 3, resource recycling of copper in electroplating sludge)

[0124] The electroplating sludge treated in this embodiment is the same as that treated in Example 1.

[0125] All the other methods of electroplating sludge recycling are the same as in Example 1, except that:

[0126] In step ③, the cells of Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Heteroxia bacteria are mixed evenly at a mass ratio of 2:2:1, then added to the culture solution, and then the electroplating prepared in step ① The sludge powder is added to the culture solution to obtain the reaction mixture material. The concentration of electroplating sludge in the reaction mixture material is 20-40g / L (30g / L in this embodiment); the inoculum concentration of Thiobacillus ferrooxidans is 10 8 individual / mL, the inoculum concentration of Thiobacillus thiooxidans is 10 8 individual / mL, the inoculum concentration of heterooxygen bacteria was 10 8 individual / mL.

[0127] The Thiobacillu...

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Abstract

The invention discloses a method for recycling heavy metal in electroplating sludge. The method comprises the following steps of: carrying out screening and acclimatizing to obtain thelloobacillus ferrooxidans and thiobacillus thiooxidans which have resistance of high-concentration heavy metal; under a certain condition, respectively stirring and mixing the thelloobacillus ferrooxidans and the thiobacillus thiooxidans with the electroplating sludge together; biologically leaching the mixture so as to obtain copper-contained leach liquor or nickel-contained leach liquor; and carrying out electrodeposition on the copper-contained leach liquor after removal of impurities, so as to recycle copper, and carrying out the electrodeposition on the nickel-contained leach liquor after the removal ofthe impurities, so as to recycle nickel.

Description

technical field [0001] The invention relates to a method for recovering metals in electroplating sludge, in particular to a method for recycling heavy metals in electroplating sludge. Background technique [0002] Electroplating is one of the three major polluting industries in the world today. According to incomplete statistics, there are more than 10,000 electroplating enterprises nationwide, and the electroplating industry discharges about 4 billion cubic meters of electroplating wastewater every year. Such a large amount of electroplating wastewater, after chemical treatment, produces electroplating sludge with a large amount of heavy metals (heavy metals generally refer to metals with a density greater than or equal to 5, specifically referring to metals with atomic numbers above 24 in the periodic table of elements). The heavy metals with the largest content in these electroplating sludge are generally Cu, Ni, Zn, Cr and Fe. The heavy metal content in electroplating ...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B3/18C25C1/12C25C1/08
CPCY02P10/20
Inventor 程洁红周全法孔峰陈娴
Owner JIANGSU UNIV OF TECH
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