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Treatment method for recovering magnesium salt from copper-containing wastewater

A treatment method and technology for waste water, applied in the field of water treatment, can solve the problem that magnesium salts contain a lot of miscellaneous salts, and achieve the effects of good adsorption effect, saving operation cost and reducing dosage

Active Publication Date: 2020-08-11
江苏南大华兴环保科技股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the existing high-concentration magnesium salt wastewater contains a large amount of copper ions, resulting in more miscellaneous salts in the recovered magnesium salt, the present invention provides a method for recovering magnesium salt in copper-containing wastewater, which first aerates the monovalent copper Convert to divalent copper, use metal complexing agent to generate copper complex, remove most of the copper ions, and then remove suspended solids by flocculation and precipitation, use sulfide in the effluent, stir and precipitate copper sulfide precipitation, remove part of the copper ions, Then copper removal resin is used to absorb copper, the final effluent copper ion content is low, distillation recovery can obtain higher purity magnesium salt

Method used

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  • Treatment method for recovering magnesium salt from copper-containing wastewater
  • Treatment method for recovering magnesium salt from copper-containing wastewater
  • Treatment method for recovering magnesium salt from copper-containing wastewater

Examples

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Effect test

Embodiment 1

[0037] A treatment method for recovering magnesium salts from copper-containing wastewater according to the present invention, the treated wastewater is high-concentration magnesium salt-containing copper wastewater, the concentration of copper ions in the wastewater is 500-2000 mg / L, and the concentration of magnesium ions is 20000-100000 mg / L L. Specific steps are as follows:

[0038]S100. Pass the wastewater into the aeration tank and add air, oxygen or hydrogen peroxide and other oxidizing agents for aeration and stirring; convert the monovalent copper in the wastewater into divalent copper, the cost of aeration oxidation is low and easy to operate, and can be used Significantly improve the removal effect of copper complex sedimentation agent on copper ions, and remove most of the copper ions; it is worth noting that it can be determined whether the conversion of monovalent copper ions is complete through iodometric method and instrument detection;

[0039] S200, adjust t...

Embodiment 2

[0058] The basic content of this embodiment is the same as that of Embodiment 1, and its difference is that the specific steps are as follows:

[0059] S100, passing the waste water into the aeration tank and passing air into it for aeration and stirring;

[0060] S200, adjust the pH of the effluent in S100 to 6, add heavy metal complexing agent TMT-15 for complexation and stirring; the dosage of primary precipitation is 1.0g per kilogram of wastewater, and the dosage of secondary precipitation is per kilogram of wastewater Add 0.5g in the medium dosage;

[0061] S300, pass the effluent in S200 into the flocculation tank, add flocculant to carry out flocculation, sedimentation, and filtration in sequence; the flocculant used is PAC;

[0062] S400. Add a precipitant to the effluent in S300 for precipitation, stir to precipitate copper sulfide precipitation, and filter after precipitation; the precipitant used is sodium sulfide, and the dosage of the primary precipitation is 1g...

Embodiment 3

[0070] The basic content of this embodiment is the same as that of Embodiment 1, and its difference is that the specific steps are as follows:

[0071] S100, passing the wastewater into the aeration tank and adding oxygen for aeration and stirring;

[0072] S200, adjust the pH of the effluent in S100 to 8, add heavy metal complexing agent TMT-15 for complexation and stirring; the dosage of primary precipitation is 0.2g per kilogram of wastewater, and the dosage of secondary precipitation is per kilogram of wastewater Add 0.1g in the medium dosage;

[0073] S300, pass the effluent in S200 into the flocculation tank, add flocculant to carry out flocculation, sedimentation, and filtration in sequence; the flocculant used is PAM;

[0074] S400, add a precipitant to the effluent in S300 for precipitation, stir and precipitate copper sulfide precipitation, and filter after precipitation; the precipitant used is sodium sulfide, and the dosage of the primary precipitation is 0.5g per...

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Abstract

The invention belongs to the technical field of water treatment, relates to a treatment method for recovering magnesium salt from copper-containing wastewater; and aims at solving the problem that existing high-concentration magnesium salt wastewater contains a large number of copper ions and the recycled magnesium salt contains a large amount of miscellaneous salt. According to the method for recovering magnesium salt in copper-containing wastewater, firstly, monovalent copper is converted into bivalent copper through aeration; precipitation is performed with metal complexing agents to generate copper complexes, effluent is subjected to sulfide precipitation and stirred to separate out copper sulfide precipitation, sulfide precipitation effluent flows back to the metal complexing agent precipitation tank to be subjected to secondary precipitation, secondary precipitation effluent is subjected to copper removal through copper removal resin adsorption, finally, the content of copper ions in the effluent is low, magnesium salt with high purity can be obtained through evaporation and recovery, and resin is regenerated through acid water to recover the copper ions.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to a treatment method for recovering magnesium salt from copper-containing wastewater. Background technique [0002] Chemical enterprises will produce a large amount of high-salt wastewater. Compared with other wastewater, this type of wastewater contains a large amount of inorganic salts. This type of wastewater is generally saturated brine. If it is discharged into the natural environment without treatment, it will directly lead to an increase in the salinity of river water, bringing more and more serious pollution to soil, surface water, and groundwater, and endangering the ecological environment. Most of the salts contained in high-salt wastewater are Cl - , SO 4 2- 、Na + 、PO 4 + Although these ions are essential nutrients for the growth of microorganisms, they play an important role in promoting enzyme reactions, maintaining membrane balance and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01F5/00C02F101/20C02F103/34
CPCC02F9/00C01F5/00C02F1/66C02F2101/20C02F1/5281C02F2001/007C02F1/001C02F1/285C02F1/04C02F2103/34C02F1/722C02F1/727C02F1/74C02F1/5236C02F1/56C02F2301/08
Inventor 杨峰戴建军赵选英程夫苓刘君君
Owner 江苏南大华兴环保科技股份公司
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