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Method for recovering copper in copper-containing acid waste water of mine

A technology for acidic wastewater and wastewater, applied in mining wastewater treatment, chemical instruments and methods, water pollutants, etc., can solve problems such as inability to recycle copper metal resources, large amount of heavy metal-containing precipitated sludge, and difficulty in completely replacing copper ions , to achieve the effect of easy management, low operating cost and high copper recovery rate

Inactive Publication Date: 2010-06-09
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lime (milk of lime) neutralization precipitation method has the advantages of simple process and low cost, but it cannot recycle copper metal resources, the amount of heavy metal-containing sedimentation sludge is large, the scale is serious, the pipeline is easy to be blocked, and improper disposal is easy to cause secondary environment Pollution and other issues; iron filings replacement method is an ancient method for recovering copper in copper-containing mine acid wastewater. Although copper can be recovered, there are problems such as long reaction time and difficulty in completely replacing copper ions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The copper-containing wastewater of a gold-copper mine has a copper ion concentration of 60mg / L and a pH of 5.5. Pass the copper-containing wastewater into the iron-carbon fixed bed with built-in cast iron chips and activated carbon at a ratio of 1:1 to treat the wastewater. The copper-containing wastewater should cover the iron-carbon of the iron-carbon bed without overflowing the iron-carbon bed. After 30 minutes of treatment, the effluent The copper ion concentration is 0.24mg / L, the pH is 6.0, and the copper recovery rate reaches 99.6%.

Embodiment 2

[0020] Copper-containing acid wastewater from a copper mine seriously pollutes the environment due to the high content of copper ions. Its copper ion concentration is 135.5mg / L, pH3.0. Apply the present invention to process the wastewater, pass the copper-containing wastewater into the iron-carbon aeration bed with 3:1 iron-carbon built-in, iron sponge iron, carbon select coke, and the aeration rate is 1m 3 Gas / m 3 Water min, copper-containing wastewater should cover the iron-carbon bed of the iron-carbon bed without overflowing the iron-carbon bed, and stay for 1 hour. Copper ions are recovered in large quantities after treatment, the recovery rate reaches 99.2%, and the pH is 5.5.

Embodiment 3

[0022] Copper-containing acid wastewater from a copper mine has a copper ion concentration of 163.5 mg / L and a pH of 2.5. Apply the present invention to process the waste water, pass the copper-containing waste water into the iron-carbon fluidized bed with built-in 4:1 iron-carbon, steel scraps for iron, and the combination of coke and activated carbon for carbon, the ratio is 1:4, and the copper-containing waste water needs to be The iron carbon covering the iron carbon bed does not overflow the iron carbon bed, and stays for 2 hours. The concentration of copper ions in the treated effluent is 1.14mg / L, pH5.2, and the recovery rate of copper reaches 99.3%.

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Abstract

The invention relates to a method for recovering copper in copper-containing acid waste water of a mine. The method is characterized by an iron-carbon microelectrolysis method and comprises the following steps of: importing waste water into an iron carbon microelectrolysis pond of an iron carbon bed and staying for 0.5-5 hours, wherein the waste water addition takes the standard that added waste water covers the iron carbon of the iron carbon bed and does not overflow out of the iron carbon bed as a reference so as to ensure that the waste water has microelectrolysis and replacement reactions, deposited copper is reduced on a cathode carbon surface so as to achieve the purpose of recovering metal copper, and the mass loading ratio of iron to carbon in the iron carbon bed is 1:5. The method has the advantages of simplicity, good treatment effect, low expense, easy operation, and the like and can be used for recovering copper in the copper-containing acid waste water of a mine.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for recovering copper in copper-containing acid wastewater in mines. Background technique [0002] Copper and non-ferrous metal ore and other ores contain a certain amount of sulfur or copper sulfide. During the mining process, due to the exposed surface of underground mines and open-pit mines, the stripped rock and soil are piled up in the open air, and a large number of tailings are stored in tailings ponds. Under the catalysis of microorganisms such as Thiobacillus iron oxides and Thiobacillus thiooxidans, copper-containing sulfide ores are oxidized, and after being washed by rainwater, acidic mine wastewater containing copper ions, sulfuric acid and sulfates is formed. [0003] At present, domestic and foreign methods for treating acidic wastewater from copper-containing mines mainly include lime (lime milk) neutralization precipitation method and ir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/70C02F103/10C02F101/20
Inventor 徐晓军罗发生李新征陈映雪邱珉张瑾
Owner KUNMING UNIV OF SCI & TECH
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