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Method for removing and recovering thallium from industrial wastewater

A technology for industrial wastewater and industrial water, applied in the field of electrochemistry, to achieve the effects of simple operation, less reagent consumption, and high selective separation and utilization rate

Active Publication Date: 2020-05-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above patents that the current treatment of thallium in wastewater not only requires a large amount of reagents, but also produces a large amount of thallium-containing sediment or slag, and the thallium has not been effectively recovered

Method used

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  • Method for removing and recovering thallium from industrial wastewater
  • Method for removing and recovering thallium from industrial wastewater
  • Method for removing and recovering thallium from industrial wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] (1) Preparation of working electrode

[0070] Prussian blue (FeFe(CN) 6 ), carbon fiber and PVDF were mixed according to the mass ratio of 90:6:4 to obtain a mixture, and 20 g of the mixture was coated on a carbon fiber plate with a size of 10×10 cm to make a working electrode A.

[0071] Prussian blue (KFeFe(CN) 6 ), carbon fiber and PVDF are mixed according to the above mass ratio, and the working electrode B is made in the same way.

[0072] (2) Thallium intercalation process

[0073] The total volume of the electrolytic cell is 10L, the cathode chamber and the anode chamber are 5L each, and the diaphragm is an anion exchange membrane containing basic active groups. Working electrode B is connected to the anode, and working electrode A is connected to the cathode. The working electrode B and the first anolyte are placed in the anode chamber, and the working electrode A and the thallium-containing waste water are placed in the cathode chamber for electrolytic reac...

Embodiment 2

[0084] (1) Preparation of working electrode

[0085] Prussian blue in working electrode A is FeNi(CN) 6 , the Prussian blue in the working electrode B is KFeNi(CN) 6 , other experimental materials are the same as in Example 1.

[0086] (2) Thallium intercalation process

[0087] The thallium content in the thallium-containing wastewater was 1.5mg / L, the cell voltage was 0.9V, the water in the cathode chamber was continuously changed 100 times, and the total purified wastewater volume was 500L. Other operating procedures were the same as in Example 1. The concentration of thallium ions in the purified wastewater is less than 0.004mg / L, and the removal rate of thallium reaches 99.73%.

[0088] (4) Thallium removal process

[0089] Replace electrolyzer, other operation process is with embodiment 1. The thallium concentration in the thallium concentrate is 141mg / L, achieving 94 times of thallium concentration.

[0090] The working electrode A and the working electrode B afte...

Embodiment 3

[0092] (1) Preparation of working electrode

[0093] Prussian blue (FeNi(CN) 6 ), carbon fiber and PVDF are mixed according to the mass ratio of 90:6:4 to obtain the first mixture. The first mixture and sodium chloride are mixed according to the mass ratio of 100:10 to obtain the second mixture. 20 g of the mixture was coated on a carbon fiber plate with a size of 10×10 cm to make a working electrode A.

[0094] Prussian blue (KFeNi(CN) 6 ), carbon fiber and PVDF are mixed according to the mass ratio of 90:6:4 to obtain the third mixture. The third mixture and sodium chloride were mixed according to the mass ratio of 100:10 to obtain the fourth mixture. 20 g of the mixture was coated on a carbon fiber plate with a size of 10×10 cm to make a working electrode B.

[0095] (2) Thallium intercalation process

[0096] The thallium content in the thallium-containing wastewater was 1.5mg / L, the cell voltage was 0.9V, the water in the cathode chamber was continuously changed 100...

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Abstract

The invention provides a method for removing and recovering thallium from industrial wastewater. The method is based on the selectivity of Prussian blue molecular vacancies to thallium ions, realizesthe intercalation and deintercalation of thallium ions through electrochemical reduction and oxidation, and can obtain a highly-concentrated solution of thallium, thereby realizing the selective removal and recovery of thallium in wastewater. The method has the advantages of simplicity in operation, low reagent consumption, high selective separation and utilization rate and no thallium-containingwaste residues.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a method for removing and recovering thallium from industrial waste water. Background technique [0002] Thallium is not only a very toxic metal element, but also a high-value raw material. In terms of toxicity, the harm of thallium is far greater than that of conventional pollutants such as arsenic, chromium, cadmium, lead, etc., and because of its accumulation in mammals, it concentrates on the respiratory, digestive and nervous systems of humans, and the lethal dose to humans is only 10-15mg / kg. And because of its extremely low content in nature (the abundance of elements in the upper continental crust is only 0.75ppm), there are almost no individual minerals, and its existence is often associated with metal sulfide ores such as lead, zinc, iron, and copper. Wastewater enters into the smelting process, causing harm to the environment. [0003] The enterprises that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/467C22B7/00C22B61/00C02F101/20
CPCC02F1/4672C02F1/4676C02F2101/20C22B7/006C22B61/00Y02P10/20
Inventor 孙丰龙赵天瑜何利华赵中伟刘旭恒陈星宇李江涛
Owner CENT SOUTH UNIV