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Method for recovering thallium from flue gas and equipment for implementing method

A flue gas and equipment technology, applied in the field of environmental protection, can solve the problems of water consumption, excessive calcium impurities, water waste, etc., and achieve the effect of low operating cost, non-toxic cost, good circulation and recovery

Active Publication Date: 2021-10-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the collection is dust. This method is similar to metallurgical recovery of thallium. It contains not only thallium, but also too much calcium impurities. The separation process consumes a lot of water, which will cause waste of water.

Method used

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  • Method for recovering thallium from flue gas and equipment for implementing method
  • Method for recovering thallium from flue gas and equipment for implementing method
  • Method for recovering thallium from flue gas and equipment for implementing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] 1. For the cement kiln process equipped with a waste heat boiler, a charging device and a honeycomb titanium-containing adsorption device are arranged in the flue between the cyclone dust collector and the waste heat boiler, and the fine particles containing thallium after conditioning by the charging device are adsorbed on the honeycomb On the titanium-containing adsorption device, the thallium-rich adsorption device is obtained by regular replacement, and the specific surface area of ​​the titanium-based porous material is 70-80m 2 / g; the specific process is as follows, and the accompanying drawings are as follows Figure 4 Shown:

[0093] A. A charging device is installed in the high temperature section of the vertical flue (about 300°C) after the outlet of the cyclone dust collector. The flue gas passes through the flat charging device (satisfies the DC electrostatic field current of more than 40μA), forming charged thallium dust and moving downward. ;

[0094] B...

Embodiment 2

[0101] 1. For conventional cement kilns equipped with electrostatic precipitator for secondary recovery of clinker, an adsorption device is arranged directly behind the electrostatic precipitator, and the pre-charging function is realized by the electrostatic precipitator, that is, the electrostatic precipitator is the charging device (to meet the DC electrostatic field Current 40μA or more), the thallium-containing microparticles after conditioning are adsorbed on the vertical honeycomb titanium adsorption device, and the thallium-rich adsorption device is obtained by regular replacement. The specific surface area of ​​the titanium-based porous material in the vertical honeycomb titanium adsorption device is 70 -80m 2 / g, the specific process is as follows, and the drawings are as follows Figure 5 Shown:

[0102] A. Install a vertical honeycomb titanium adsorption device after the outlet of the electrostatic precipitator (around 150°C);

[0103] B. The extremely fine thall...

Embodiment 3

[0110] 1. For cement kilns equipped with conventional high-temperature electrostatic precipitators + SCR denitrification devices, the adsorption device is arranged directly after the electrostatic precipitator and before the SCR, and the pre-charging function is realized by the electrostatic precipitator, that is, the electrostatic precipitator is the charging device (meeting DC electrostatic field current above 40μA), the thallium-containing microparticles after conditioning are adsorbed on the vertical honeycomb titanium-containing adsorption device, and the thallium-rich adsorption device is obtained by regular replacement. The specific surface area of ​​the titanium-based porous material in the honeycomb titanium adsorption device is 70 -80m 2 / g, the specific process is as follows, and the drawings are as follows Figure 5 Shown:

[0111] A. Install a vertical honeycomb titanium-containing adsorption device after the outlet of the electrostatic precipitator (around 280°C...

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Abstract

The invention provides a method for recovering thallium from flue gas and equipment for implementing the method. The method for recovering thallium from the flue gas comprises the following steps: charging thallium-containing microparticles in the flue gas to form charged thallium dust; adsorbing the charged thallium dust by using an adsorption device to obtain a thallium-rich adsorption device; soaking the thallium-rich adsorption device with water and / or acid liquor, obtaining leachate and a regeneration adsorption device; and carrying out post-treatment on the leachate to obtain a thallium-rich solution. Compared with a wet recovery process and an organic extraction thallium recovery process in smelting, the method for recovering thallium from the flue gas has the advantages that the used reagent is nontoxic and low in cost, metal elements are not added, materials in the whole treatment process are better circulated and recovered, no waste is generated, and the method has outstanding social and economic benefits.

Description

technical field [0001] The invention relates to a method for recovering thallium from flue gas and equipment for implementing the method, in particular to a method for intercepting and recovering thallium from cement kiln flue gas and equipment for implementing the method, belonging to the field of environmental protection. Background technique [0002] Thallium is a typical rare dispersed element existing in nature with a natural abundance of 8×10 -7 , thallium is mainly in nature as Tl + Thallium exists in the sulfide state, and the sulfur-friendly properties of thallium make thallium often form symbiotic combinations of elements in sulfides. These characteristics determine that thallium is widely distributed in various ores and minerals, and it is easy to appear in cement raw materials, making the concentration of thallium in cement tail gas dust collection Reach 0.03~0.09%, the concentration of thallium in flue gas can reach 25μg / m 3 . [0003] At present, thallium is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B61/00C22B7/02
CPCC22B61/00C22B7/02C22B7/007Y02P10/20
Inventor 李俊华陈公达陈建军单良
Owner TSINGHUA UNIV
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