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The Study of Reducing Dephosphorization on Nb-bearing Hot Metal

Author: LuJianFa
Tutor: ZhaoZengWu
School: Inner Mongolia University of Science and Technology
Course: Iron and steel metallurgy
Keywords: Reducing dephosphorization Desulfurization niobium
CLC: TF704.4
Type: Master's thesis
Year: 2013
Downloads: 10
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Abstract


Phosphorus is harmful for the vast majority of steels in terms of the most significant harm willbe caused by the cold brittleness of the steel material; phosphorus content is too high to beinterested in the weldability of the steel material adverse effect against stress corrosion hazards;phosphorus steel segregation element. For a small number of steels, phosphorus is beneficialelements, such as artillery shells steel. Overall, the phosphorus in the steel should endeavor toremove.Metallurgical industry phosphorus removal dephosphorization of the oxidationDephosphorization and restore law. The oxidation Dephosphorization phosphorus loss of electronsto a phosphate drawbacks it could easily lead to the burning of the alloying elements and wheneasily oxidized alloying elements in the molten steel. Reductive dephosphorization phosphoruselement electron reduction phosphide in the form of departing from the liquid steel, such a processis conducted under reducing conditions, thus avoiding the loss of the alloying elements in the liquidsteel.Bayan Obo iron ore containing niobium, obtained pig iron containing about0.018%niobium.The subsequent refining oxidation Dephosphorization will inevitably result in the burning of theniobium, manganese alloying elements. Order reserved on the the liquid steel Dephosphorizationwhen containing micro-alloying elements niobium and other beneficial elements to achieveefficient use of the Bayan Obo mine, the research group has proposed a method of the restoreDephosphorization the niobium-containing liquid steel, but also on the restored by addingdephosphorizer in a reducing atmosphere, so that the decomposition of the active metal elementswith the phosphorus elemental sulfur and restore dephosphorizer in the liquid steel reactionphosphide, and then out of the liquid steel. Strong oxidizing atmosphere, to avoid the traditionaloxidation dephosphorization Add the the high alkalinity oxide dephosphorizer resulting in theremoval of the phosphorus element in the liquid steel alloying elements for burning phenomenon.Niobium and niobium microalloyed steels advantages and potential applications in theliterature review in more detail the to introduced a restore Dephosphorization process principle, characteristics and development profiles, summed up the results of previous work. Providedirection for subsequent experiments and thermodynamic calculations.In this thesis, completed the aspects of work:by thermodynamic calculation to restore the dephosphorization Paul niobium feasibility, theliquid steel oxygen phosphorus sulfur dephosphorizer decomposition of calcium restore the theniobium content will not change.想In the thesis experiment, several restore dephosphorizer the restore Dephosphorizationexperiments, metal calcium reduction the dephosphorization experiments, calcium carbidereduction to dephosphorization experiments, calcium alloy restore Dephosphorization in theexperiment. Join the way by to explore dephosphorizer behavior in molten steel, differentdephosphorizer kinetic conditions, and proposed iron tube into a new process dephosphorizerfeeding liquid steel method. The results obtained by such methods higher Dephosphorization rate.The paper also compares the type of material of the crucible, the type of the carbon content ofliquid steel impact on the a dephosphorization rate of the dephosphorization agent for the alloyingelements in the liquid steel and other non-alloying elements, to achieve the desired effect.iron pipe feeding dephosphorizer, the paper presents a gas-liquid interface reaction kineticsmodel. The decomposition of calcium dephosphorizer vapor react in the gas-liquid interface, theresult has been well verified.

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CLC: > Industrial Technology > Metallurgical Industry > Steelmaking > General issues > Smelting process and operations > Dephosphorization
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