Treatment method of precious metal-containing wastewater

A precious metal and treatment method technology, which is applied in the treatment field of precious metal-containing wastewater, can solve problems such as difficult recovery of precious metals, and achieve the effects of effective regeneration, pH control, and loss avoidance.

Inactive Publication Date: 2021-03-12
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the problem that the precious metals in the desorption liquid are difficult to recover in the existing resin adsorption treatment process of waste water containing precious metals, the present invention provides a treatment method for waste water containing precious metals, which uses resin to carry out the precious metal ions contained in the waste water. Desorption treatment after adsorption, followed by the separation of precious metal ions in the desorption solution by electrodeposition

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this embodiment, the following method is used to treat the waste water containing precious metals. The waste water treated in this embodiment contains Ag with a concentration of 1 mg / L. + , pH 6.5: The resin used is NDA-Ag.

[0048] The specific processing steps are as follows:

[0049] Step 1: Use resin to carry out adsorption treatment on wastewater containing precious metal ions. The wastewater passes through the resin at a flow rate of 1BV / h, and the silver ion content in the effluent after adsorption treatment is 7.1×10 -3 mg / L;

[0050] Step 2: Take out the resin in the adsorption column and soak it in water at a temperature of 55°C for 1 hour to desorb and regenerate the resin. The volume ratio of water to resin is 0.7:1;

[0051] Step 3: After the desorption is completed, filter and separate the resin and the desorption solution. After testing, the Ag in the desorption solution is + The concentration is 980mg / L, and the pH value of the desorption solution ...

Embodiment 2

[0058] In this embodiment, the following method is used to treat the waste water containing precious metals. The waste water treated in this embodiment contains Ag with a concentration of 2.2 mg / L. + , pH 7: The resin used is NDA-Ag.

[0059] The specific processing steps are as follows:

[0060] Step 1: Use resin to carry out adsorption treatment on wastewater containing precious metal ions. The wastewater passes through the resin at a flow rate of 10BV / h, and the silver ion content in the effluent after adsorption treatment is 9.2×10 -3 mg / L;

[0061] Step 2: Take out the resin in the adsorption column and soak it in water at a temperature of 62°C for 1 hour to desorb and regenerate the resin. The volume ratio of water to resin is 0.7:1;

[0062] Step 3: After the desorption is completed, filter and separate the resin and the desorption solution. After testing, the Ag in the desorption solution is + The concentration is 1630mg / L, and the pH value of the desorption solutio...

Embodiment 3

[0069] In this embodiment, the following method is used to treat the waste water containing precious metals. The waste water treated in this embodiment contains Ag with a concentration of 3 mg / L. + , pH 7.2: The resin used is NDA-Ag.

[0070] The specific processing steps are as follows:

[0071] Step 1: Use resin to carry out adsorption treatment on wastewater containing precious metal ions. The wastewater passes through the resin at a flow rate of 11BV / h, and the silver ion content in the effluent after adsorption treatment is 9.9×10 -3 mg / L;

[0072] Step 2: Take out the resin in the adsorption column and soak it in water at a temperature of 68°C for 1 hour to desorb and regenerate the resin. The volume ratio of water to resin is 0.7:1;

[0073] Step 3: After the desorption is completed, filter and separate the resin and the desorption solution. After testing, the Ag in the desorption solution is + The concentration is 1880mg / L, and the pH value of the desorption solutio...

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PUM

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Abstract

The invention discloses a treatment method of precious metal-containing wastewater, and belongs to the field of wastewater treatment and resource recycling. The method comprises the following steps: adsorbing the precious metal-containing wastewater by using resin, desorbing and regenerating the resin by using hot water, and controlling the pH value of the wastewater to be 4-6, so as to directly recover precious metals by using an electro-deposition method and reduce the operation links and lower the cost. According to the method, after the wastewater containing the precious metal is adsorbedand discharged, the concentration of the precious metal is reduced to 0.01 mg / L or below, and the emission standard of precious metal pollutants is met.

Description

technical field [0001] The invention belongs to the field of waste water treatment and resource recycling, and more specifically relates to a treatment method for waste water containing precious metals. Background technique [0002] Industrial wastewater often contains a large amount of precious metal ions, which seriously pollutes the environment and endangers human health. Therefore, the technology of controlling precious metal pollution has received great attention. With the development of industry, the application of precious metals has become more and more extensive, but precious metal resources are scarce and smelting is difficult. Therefore, it is of great economic and social significance to recover the "secondary resources" of precious metals from waste materials, waste liquids and wastewater containing precious metals. Removal of precious metals or recovery of precious metals from waste liquid and waste water, traditional methods include chemical precipitation, el...

Claims

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Application Information

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IPC IPC(8): C02F1/28C25C1/20C25C1/08C02F101/20C02F101/22
CPCC02F1/285C25C1/20C25C1/08C02F2101/20C02F2303/16C02F2101/206C02F2101/22
Inventor 张炜铭计成汉张宁朱兆坚余航潘丙才花铭吕路
Owner NANJING UNIV
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