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Rare-earth electrolysis fume cleaning system and method

A flue gas purification system and rare earth technology, applied in the direction of electrolysis components, electrolysis process, etc., can solve the problems of high energy consumption, large pollution of rare earth electrolysis flue gas, etc., and achieve high heat utilization rate, good fluoride removal effect, and high automation level Effect

Active Publication Date: 2016-05-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the current technical problems of heavy pollution and high energy consumption of rare earth electrolysis flue gas, the present invention provides a rare earth electrolysis flue gas purification system and method that can effectively absorb pollutants produced by electrolysis and consume less energy

Method used

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  • Rare-earth electrolysis fume cleaning system and method

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Effect test

Embodiment 1

[0042] The flue gas from the rare earth electrolyzer is collected into the exhaust pipe and then enters the partition cooler to reduce the temperature of the flue gas from 100°C to 40°C. The cooled flue gas enters the Venturi reactor and undergoes an adsorption reaction with the fresh praseodymia from the adsorbent silo and the fluorine-loaded praseodymia from the bag filter. The adsorbed fluorine-loaded praseodymium oxide enters the bag filter together with dust and other solids and flue gas for gas-solid separation. The fluorine-loaded adsorbent is collected by the bag filter, and part of it is sent to the Venturi reactor for circulation through the pneumatic chute. Adsorption, a part is sent to the air lifter through the air chute to be lifted to the fluorine-loaded adsorbent silo, and the fluorine-loaded praseodymium oxide in the fluorine-loaded adsorbent silo is directly returned to the rare earth electrolytic cell for production. The dedusted flue gas is sent to the bott...

Embodiment 2

[0044] The flue gas from the rare earth electrolyzer is collected in the exhaust pipe and enters the heat exchanger to reduce the temperature of the flue gas from 200°C to 30°C. The flue gas after cooling enters the fixed-bed reactor, and the alumina in the alumina silo is added to the reactor to absorb the flue gas through a quantitative feeding device and a pneumatic chute, and a certain amount of fluorine-loaded alumina is added as required. After the reaction, the fluorine-loaded alumina enters the electrostatic precipitator together with dust and other solids and flue gas for gas-solid separation. The fluorine-loaded alumina is collected by the electrostatic precipitator, part of it is used as a circulating adsorbent, and part of it overflows from the fluidized bed at the lower part of the dust collector to the pneumatic chute, and is sent to the air elevator through the pneumatic chute to be lifted to the fluorine-loaded alumina silo , the fluorine-containing alumina is ...

Embodiment 3

[0046] The flue gas from the rare earth electrolytic cell is collected into the smoke exhaust pipe, and the length of the smoke exhaust pipe is set to be longer, so that the temperature of the flue gas is reduced from 170°C to 90°C. The cooled flue gas enters the fluidized bed, and the terbium oxide in the terbium oxide silo is added to the reactor to absorb the flue gas through a quantitative feeding device and a pneumatic chute, and a certain amount of fluorine-carrying terbium oxide is added as required. After the reaction, the fluorine-loaded terbium oxide enters the electrostatic precipitator together with dust and other solids and flue gas for gas-solid separation. Fluorine-carrying terbium oxide is collected by the cyclone dust collector, part of which is used as a circulating adsorbent, and part overflows from the lower part of the dust collector to the pneumatic chute, and is sent to the air elevator through the pneumatic chute to be lifted to the fluorine-carrying ter...

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Abstract

The invention relates to a rare-earth electrolysis fume cleaning system and method. The rare-earth electrolysis fume is treated by a two-stage cleaning technique, wherein the first stage is dry-process adsorption for defluorination, and the second stage is wet-process treatment for SO2 removal. The dry-process adsorption adopts special oxides for adsorption. The method has the advantages of high adsorption rate for fluorides and favorable defluorination effect, can recover fluorides in the fume, can remove SO2 in the fume, reduces the discharge of acidic gas, and is friendly to the environment. The system can recover fume waste heat, has the characteristics of high heat utilization ratio, low operating cost, high automation level and the like, and is simple to operate.

Description

technical field [0001] The invention belongs to the technical field of rare earth electrolysis, in particular to a rare earth electrolysis flue gas purification system and method. Background technique [0002] At present, the molten salt electrolysis method has been widely used in the large-scale production of rare earth metals and alloys. The molten salt electrolyte is mainly a fluorine salt system, and the electrolysis temperature is as high as 1000 degrees. During the electrolysis process, the anode will generate a large amount of CO, CO 2 , especially under high temperature conditions, the fluorine salt electrolysis system causes a large amount of fluorine-containing gas emissions, such as: from raw materials and H in the air 2 O will generate HF gas with fluoride, and a large amount of volatilization of fluoride salt at high temperature. In addition, with the decline of the quality of carbon materials in my country, the content of impurity S in the carbon anode is hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/34C25C7/06
CPCC25C3/34C25C7/06
Inventor 吕晓军双亚静许真铭曾小鹏
Owner CENT SOUTH UNIV
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