Current-assisted cadmium extraction replacement device

A current and zinc electrode technology, applied in the field of current-assisted replacement cadmium extraction device, can solve the problems of high residual cadmium concentration and slow cadmium replacement rate, and achieve the effect of reducing remelting and slowing down coverage

Active Publication Date: 2022-01-11
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is mainly to provide a current-assisted replacement cadmium extraction device, which aims to solve the problems of slow cadmium replacement rate in traditional electrolysis devices, difficult fall-off of sponge cadmium, and high residual cadmium concentration. technical problem

Method used

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  • Current-assisted cadmium extraction replacement device
  • Current-assisted cadmium extraction replacement device

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Effect test

Embodiment 1

[0022] In the current-assisted replacement cadmium extracting device in this embodiment, the tubular zinc electrode has an aperture of 20mm and a wall thickness of 5mm, and circular holes with an aperture of 5mm are evenly distributed on the wall; the tubular lead electrode has an aperture of 50mm and a wall thickness of 5mm; The length of the zinc electrode and the tubular lead electrode is 200mm; the interval between the tubular zinc electrode and the tubular lead electrode is provided by a plastic support frame. Use this device to process 1g / LCd 2+ , 10g / L Zn 2+ , 25g / L H 2 SO 4 For waste liquid, the liquid inlet speed is 60mL / min, the zinc electrode speed is 80r / min, and the zinc electrode current density is 2mA cm -2 , outlet Cd 2+ The concentration is 20mg / L, and the grade of sponge cadmium is 98%.

Embodiment 2

[0024] In the current-assisted replacement cadmium extraction device in this embodiment, the aperture of the tubular zinc electrode is 100 mm, and the wall thickness is 20 mm, and circular holes with an aperture of 10 mm are evenly distributed on the wall; the aperture of the tubular lead electrode is 125 mm, and the wall thickness is 8 mm; The length of the zinc electrode and the tubular lead electrode is 700 mm; the tubular zinc electrode and the tubular lead electrode are separated by a plastic support frame. Use this device to treat 1g / L Cd 2+ , 20g / L Zn 2+ , 10g / L H 2 SO 4 For waste liquid, the liquid inlet speed is 120mL / min, the zinc electrode speed is 200r / min, and the zinc electrode current density is 3mA cm -2 , outlet Cd 2+ The concentration is about 34mg / L, and the grade of sponge cadmium is about 97.6%.

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Abstract

The invention discloses a current-assisted cadmium extraction replacement device which comprises a tubular zinc electrode, a tubular lead electrode, a zinc electrode rotating shaft, a plastic packaging body, a front packaging cover and a rear packaging cover, wherein a hole is formed in the wall surface of the tubular zinc electrode, the tubular zinc electrode is arranged in the tubular lead electrode, the tubular zinc electrode and the tubular lead electrode are coaxially arranged, a rotating shaft is arranged in the tubular zinc electrode to drive the tubular zinc electrode to rotate, the plastic packaging body, the front packaging cover and the rear packaging cover seal the tubular zinc electrode and the tubular lead electrode, the front packaging cover is provided with a tubular zinc electrode conductive connector and a water inlet, and the rear packaging cover is provided with a tubular lead electrode conductive connector and a water outlet. The device is advantageous in that the occupied area is small, the group installation is easy, the working area is large, the cadmium replacement rate is high, the collection of sponge cadmium is easy, the grade of the sponge cadmium is high, and the device has the important industrial application value.

Description

technical field [0001] The invention belongs to the field of nonferrous metal metallurgy, and in particular relates to a device for extracting cadmium by current-assisted displacement. Background technique [0002] Cadmium is a highly toxic heavy metal. Industries such as smelting and electroplating often produce cadmium-containing waste liquid, and cadmium must be removed below the concentration limit before discharge. In industry, zinc powder replacement method is mainly used to remove cadmium. However, when dealing with low-cadmium waste liquid, the zinc powder replacement process has a large consumption of zinc powder, and the sponge cadmium contains high zinc, so it cannot be directly sent to high-temperature distillation to extract cadmium. [0003] Patent CN108220999A proposes a device for recovering cadmium from cadmium-ammonia solution, including an electrolytic cell, an electrolytic plate device, a crawler transmission device and an ultrasonic generating device. ...

Claims

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Application Information

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IPC IPC(8): C22B17/00C22B7/00C25C1/16C25C7/06C25C7/00
CPCC22B17/04C22B7/006C25C1/16C25C7/06C25C7/00Y02P10/20
Inventor钟晓聪严康徐志峰王瑞祥衷水平
OwnerJIANGXI UNIV OF SCI & TECH