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Numerical Simulation Of Influence Of Anode Surface Porous On Flow Field In Rare Earth Electrolytic Cell

Posted on:2015-03-28Degree:MasterType:Thesis
Country:ChinaCandidate:Y S HuFull Text:PDF
GTID:2181330422990253Subject:Metallurgical engineering
Abstract/Summary:PDF Full Text Request
In recent years, with the development of NdFeB rare earth permanent magnet materialperformance, the preparation of hot-pressing rare earth permanent magnet materials andthe continuous development of rare earth magnetic refrigeration technology have madetremendous progress. With the further study of high purity yttria-coated etched very largescale integrated circuits, the preparation of rare earth phosphors, rare earth luminescentmaterials of the solar, LED light materials and LED phosphor materials and the preparationof rare earth materials etc, molten salt electrolysis as the primary method of production ofrare earth metals play a more important role. By optimizing process parameters, it canimprove production efficiency and quality of product and reduce energy consumption. Itcan contribute a lot to the rare earth metallurgy industry.Currently the development of rare earth cell has been more mature. The3KAplug-earth fluoride-oxide system electrolytic cell was commonly used. The advantagessuch as: simple structure, mature technology, suitable for large-scale promotion, allowed itto be continuously recognized by society. However, there are still a lot of outstandingissues in the production. In this paper,3kA cell anode electrolytic cell as main object thatneeds to be studied. On the basis of previous studies, referencing the magnesium,aluminum electrolysis cell, selected the appropriate anode materials for the rare earthelectrolysis cell,analyzed the anode gas composition, investigated the effects of gas flowon the flow field, and select the appropriate specific surface area of the anode material andproduction temperature. Those works provide a reference for the optimization ofproduction, concrete work and the results are as follows:(1)This paper is about the research of influence of the anode material anode andsurface porous on electric field and the flow field in the electrolytic cell. The study foundthat the anode material and the surface morphology and internal structure have a greaterimpact on the macroscopic electric field and flow field; it could provide a new reference toreduce the cost of production, the use of energy, discharge of waste and improve the efficiency.(2)After respectively calculated the electric field in the rare earth melts under the caseof the insertion depth of200mm,220mm and240mm, using three kind of material:semi-graphitic, semi-graphitized and graphitized anode carbon block. We can find thatwhen the anode insertion depth is220mm, the more Joule heat were released, and at thesame time, choosing the graphitized material as the anode can save71.3RMB Yuan in aproduction cycle, it will effectively reduce the costs of production. It will createconsiderable economic benefits under the present situation of the rare earth massproduction.(3)Through the surface of graphite carbon block thermogravimetric experiment. Wecan find that, the anode gas generated on the surface of anode in the electrolytic cellcontains mainly carbon monoxide and extremely tiny amounts of carbon dioxide when thetemperature is more than1000℃.(4)After using Eulerian multiphase flow model to calculate the flow field in differentworking temperatures and specific surface area, we can find that when the specific surfacearea is3.3×106m-1and the producing temperature is1303K, it can receive a morereasonable result, it is more favorable for the electrolyte flow and the collection ofneodymium.
Keywords/Search Tags:Rare earth electric cell, Numerical simulation, Electrode materials, Flowfield
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