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A microbial agent and extraction method for extracting copper from high-salt sulfide electroplating sludge

A technology of microbial agent and electroplating sludge, which is applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve problems such as lack of salt tolerance, achieve good leaching effect, realize resource utilization, reduce The effect of the amount of acid added

Active Publication Date: 2022-06-28
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it also provides a new resource recovery idea for the resource disposal of refractory solid waste, but unfortunately, although traditional acidophilic ferrous or sulfur oxidizing microorganisms have good bioleaching effects on ores and some types of solid waste, etc. , but due to the lack of salt-tolerant biological characteristics, it is difficult to perform its bioleaching function in saline, especially high-salt environments
Therefore, there is currently no effective bioleaching method that can be applied to the bioleaching and resource recovery of high-salt sulfidation electroplating sludge.

Method used

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  • A microbial agent and extraction method for extracting copper from high-salt sulfide electroplating sludge
  • A microbial agent and extraction method for extracting copper from high-salt sulfide electroplating sludge
  • A microbial agent and extraction method for extracting copper from high-salt sulfide electroplating sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Using the high-salt sulfide electroplating sludge produced by an electroplating factory as a raw material, the biological flora constructed by the present invention is used to extract metallic copper. The steps are:

[0044] 1. The high-salt sulfide electroplating sludge raw material was measured, and its moisture content was 55.34%, and the total copper content was 12.97%. The existing forms of copper were divided into copper oxide, copper sulfide and copper sulfate, of which more than 85% of copper It exists in the form of sulfide. As shown in Table 1.

[0045] Table 1

[0046]

[0047] 2. Weigh 450g of natural-based raw materials, add the microbial flora enrichment constructed by the present invention that meets the leaching requirements, make the total leaching system reach 2L, adjust the pH to about 2.0 with sulfuric acid, and adjust the pH at 50°C at 350r / min. The stirring speed was stirred and leached for 4h.

[0048] The culturing method of the microbial ...

Embodiment 2

[0054] Using the high-salt sulfide copper-containing electroplating sludge produced by an electroplating factory as a raw material, the biological flora constructed by the present invention is used to extract metallic copper.

[0055] 1. Determine the metal content of the raw material, and the main metal element is copper, and the copper content is 10.60%.

[0056] 2. Weigh 50g of wet-based raw materials, add the bio-bacteria that meet the leaching requirements, make the total leaching system reach 200mL, adjust the pH to 2.0 with sulfuric acid, and stir and leaching at a stirring speed of 300r / min at 40°C for 2h. The culturing method of microbial flora enrichment is the same as that in Example 1.

[0057] 3. The leached material in step 2 is subjected to solid-liquid separation by means of suction filtration to obtain leaching liquid and leaching residue.

[0058] 4. Collect the filter residue obtained in step 3, add 120 mL of clean water, stir and wash for 1 hour at a stirr...

Embodiment 3

[0061] Using the high-salt sulfide copper-containing electroplating sludge produced by an electroplating factory as a raw material, the biological flora constructed by the present invention is used to extract metallic copper.

[0062] 1. The metal content of the raw material was measured, and the main metal element was measured to be copper, and the copper content was 11.60%.

[0063] 2. Weigh 25Kg of wet-based raw materials, add the biological flora bacteria liquid that meets the leaching requirements, make the total leaching system reach 100L, adjust the pH to 2.0, and stir and leaching at 300r / min at 45°C for 4h.

[0064] 3. Use a filter press to perform solid-liquid separation on the leached material in step 2 to obtain leaching liquid and leaching residue.

[0065] 4. Collect the filter residue obtained in step 3, add 70L of clean water, stir and wash at a stirring speed of 300r / min at 50°C for 1 hour, and separate the solid and liquid. This step is repeated once.

[006...

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Abstract

The invention relates to a microbial agent and an extraction method for extracting copper from high-salt sulfide electroplating sludge, including Sulfobacillus acidophilus, whose preservation number is CCTCC No: M2010203; Sulfolobus metallicus, whose preservation number is JCM 9184 ; Sulfobacillus thermotolerans, preservation number: ATCC19377; Leptospirillum ferriphilum, preservation number: ATCC 29047. The invention not only solves the problem that the ore leaching microorganisms derived from the freshwater environment cannot tolerate sodium chloride, but also improves the growth rate and leaching rate of the acidophilic microorganisms derived from the freshwater environment in the saline environment.

Description

technical field [0001] The invention belongs to the field of biological leaching and recovery of solid waste, and particularly relates to a microbial inoculum and an extraction method for extracting copper from high-salt sulfide electroplating sludge. Background technique [0002] Electroplating sludge refers to the heavy metal-containing sludge waste produced by the electroplating wastewater treatment industry after the electroplating wastewater treatment. As the "final substance" of electroplating wastewater treatment, although its quantity is much less than that of wastewater, many heavy metals such as Cu, Ni, and Zn in the wastewater are transferred to the sludge, and its composition is very complex. Therefore, it is included in the seventeenth category of hazardous waste in the national hazardous waste list. More than 15 million tons of electroplating sludge is newly added every year in my country. If no disposal of this extremely harmful sludge is done, the harm to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/20C22B15/00C22B3/18C22B7/00C12R1/01
CPCC12N1/20C22B15/0065C22B3/18C22B7/006Y02P10/20
Inventor 周洪波王玉光孙见行周文博
Owner CENT SOUTH UNIV
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