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Device and method for enriching and recovering rare and precious metal ions through nanometer zero-valent iron

A technology of nano-zero-valent iron and rare precious metals, applied in chemical instruments and methods, improvement of process efficiency, water treatment parameter control, etc., can solve the problem of low utilization rate of nano-zero-valent iron and the reaction of heavy metal ions and nano-zero-valent iron Different rates, long residence time and other problems, to achieve the effect of automatic control, enrichment and recovery efficiency improvement, and increase enrichment and recovery efficiency

Inactive Publication Date: 2018-08-10
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] (1) The utilization rate of nanometer zero-valent iron is low: In order to ensure the removal effect of heavy metal ions, the amount of nanometer zerovalent iron added to wastewater is usually excessive, and the part of the excess nanometer zerovalent iron that does not participate in the reaction with heavy metal ions, After coagulation and precipitation, the reaction system is directly discharged
[0005] (2) Wastewater stays in the nano-zero-valent iron reaction device for a long time: different types of heavy metal ions react with different nano-zero-valent iron at different rates
However, the reaction rate of some rare metal ions and nanometer zero-valent iron is very fast, and too long residence time is unnecessary for the enrichment and recovery of rare metal ions

Method used

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  • Device and method for enriching and recovering rare and precious metal ions through nanometer zero-valent iron
  • Device and method for enriching and recovering rare and precious metal ions through nanometer zero-valent iron
  • Device and method for enriching and recovering rare and precious metal ions through nanometer zero-valent iron

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Effect test

Embodiment 1

[0038] A device for enriching and recovering rare and precious metal ions by using nanometer zero-valent iron, its structure is as follows figure 1 As shown, it includes a mixer 1 arranged at the end of the sewage pipe and connected in sequence, an electromagnetic separation pipe unit 2 and a settling tank 4, a No. 1 valve 3 is arranged between the electromagnetic separation pipe unit 2 and the settling tank 4, and the device is also provided with There is a dosing pool 6, the outlet of the dosing pool 6 is connected to the mixer 1, one end of the dosing pool 6 is connected to the outlet of the electromagnetic separation pipe unit 2 through a pipeline, and a No. 2 valve 5 is set on the pipeline, and the electromagnetic separation pipe A No. 1 ORP / pH monitor 7 is installed at the outlet of the unit 2, and a No. 2 ORP / pH monitor 8 is installed in the dosing pool 6. The electromagnetic separation tube unit 2 includes three electromagnetic separation tubes arranged side by side.

...

Embodiment 2

[0043] Using a device similar to Embodiment 1, the difference is that the electromagnetic separation tube unit 2 of the present embodiment includes 4 electromagnetic separation tubes arranged side by side, such as figure 2 shown.

[0044] The device of this embodiment is used to recover rare and precious metal ions in a certain electroplating wastewater, wherein the content of rare and precious metal ions is shown in Table 2. The device for enriching and recovering rare and precious metal ions in nanometer zero-valent iron in this embodiment is as follows: figure 2 Shown: The residence time of wastewater in the pipeline mixer is 1 minute; the dosage of nano-zero-valent iron in each ton of wastewater is 0.7kg, and fresh nano-iron is added every 5 hours; four electromagnetic separation tubes are set, and the normal When working, the magnetic induction intensity is 0.02 Tesla, the residence time of waste water in the electromagnetic separation pipe is 5 minutes, and the electr...

Embodiment 3

[0048] A device similar to Embodiment 1 is adopted, except that the electromagnetic separation tube unit 2 of the present embodiment includes two electromagnetic separation tubes arranged side by side, such as image 3 shown.

[0049] The device of this embodiment is used to recover rare and precious metal ions in a certain electroplating wastewater, wherein the content of rare and precious metal ions is shown in Table 3. The device for enriching and recovering rare and precious metal ions in nanometer zero-valent iron in this embodiment is as follows: image 3 Shown: The residence time of wastewater in the pipeline mixer is 5 minutes; the dosage of nano-zero-valent iron in each ton of wastewater is 0.1kg, and fresh nano-iron is added every 4 hours; two electromagnetic separation tubes are set, and the normal When working, the magnetic induction intensity is 0.04 Tesla, the residence time of waste water in the electromagnetic separation pipe is 4 minutes, and the electromagne...

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Abstract

The invention relates to a device and method for enriching and recovering rare and precious metal ions through nanometer zero-valent iron. The device comprises a mixer, an electromagnetic separation pipe unit and a sedimentation basin which are arranged at the tail end of a sewage pipe and connected in sequence. A first valve is arranged between the electromagnetic separation pipe unit and the sedimentation basin. The device is further provided with a chemical feeding basin, an outlet of the chemical feeding basin is connected with the mixer, and one end of the chemical feeding basin is connected with an outlet of the electromagnetic separation pipe unit through a pipeline which is provided with a second valve. A first ORP / pH monitoring meter is arranged at the outlet of the electromagnetic separation pipe unit, and a second ORP / pH monitoring meter is arranged in the chemical feeding basin. Compared with the prior art, the device and method are advantageous in that by means of the efficient reaction advantage of the nanometer zero-valent iron and the rare and precious metal ions in water in cooperation with electromagnetic separation and backwash operation, the utilization rate ofthe nanometer zero-valent iron is increased to the maximum extent, and the rare and precious metal ions in the water are enriched and recovered rapidly and efficiently.

Description

technical field [0001] The invention relates to the technical field of precious metal recovery, in particular to a device and method for enriching and recovering rare and precious metal ions by using nanometer zero-valent iron. Background technique [0002] Rare and precious metals are extremely important resources, which are widely used in modern technology and industrial fields such as aerospace, petrochemical, electronic appliances, communications, etc., and are representatives of a country's economic and technological strength. In recent years, with the vigorous development of emerging high-tech industries, the demand for rare and precious metals in countries around the world is constantly expanding. The wastewater produced by smelting, electroplating and other industries contains a large amount of heavy metal ions, including rare and precious metal ions such as gold, silver, palladium, platinum, etc. Traditional treatment technology can only reduce the concentration of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C02F9/12C02F1/70C02F101/20
CPCC02F1/48C02F1/484C02F1/705C02F9/00C02F2001/007C02F2101/20C02F2209/06C02F2301/08C22B7/006C22B11/042Y02P10/20
Inventor 王伟张伟贤顾天航李若繁王晨杨思明冯嘉楠
Owner TONGJI UNIV
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