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钒渣的熔融还原研究
刘天中
Subtype硕士
Thesis Advisor王大光
1990-06-30
Degree Grantor中国科学院研究生院
Abstract于1450~1580 ℃范围内对钒、硅、锰、磷、硫等元素在碳饱和Fe-V与CaO-SiO_2-V_2O_5渣系间的分配进行了研究。结果表明:钒、硅、磷、硫的分配比随着碱度的升高而增大,锰的分配比则随碱度的升高而减小,但当B ≤ 1.2时,碱度对钒的影响不明显,当B ≥ 1.2时,碱度对锰、硫的分配比没有显著性影响;温度升高,钒、锰、硅的分配比均有所降低,但温度越高,硅分配比下降得越快;应用固体电解质定氧探头测定了铁水中的氧位,并计算出了该熔渣中钒、锰、硅、磷的氧化物的活度系数,表明渣中γ(V_2O_3)在10~(-3) ~ 10~(-5)之间,γ(SiO_2)在0.10 ~ 1.40之间,γ(P_2O_5)在10~(-23) ~ 10~(-27)之间,并且γ(V_2O_3),γ(SiO_2)、γ(P_2O_5)均随着碱度的升高和温度的降低而降低,氧化锰的活度系数在0.6 ~ 1.7之间,也随着温度的升高而增大;在CaO-SiO_2-V_2O_5渣系中,光学碱度增加,熔渣中的钒容量、磷容量、硫容量也增加,并且都具有良好的线性关系。但锰的容量却随着光学碱度的增大而线性减小。温度对钒、磷、硫容量具有不同的影响,随着温度的升高,硫容量线性增大,钒、磷容量将呈线性降低。光学碱度和温度对熔渣的钒容量、磷容量、硫容量的影响可用如下三式表示:LgC_((VO)_2)~(3-) = 13.15 Λ + 35807/T - 22.76 LgC_((PO)_4)~(3-) = 3.631 Λ + 51265/T - 22.301 LgCs = 13.195 Λ - 35807/T - 3.717在1600 ℃下对CaO-SiO_2-V_2O_5钒渣的熔融还原动力学进行了研究,得出了如下推论:钒渣中钒氧化物的还原(V_2O_3) + 3[C] = 2[V] + 3CO过程可分为两个阶段,反应初期,反应可能由界面化学反应(VO) + [C] = [V] + CO控制,随着反应的进行,控制逐渐转为渣中(V_2O_3)的扩散控制,应用单纯形法对反应速度方程中的参数进行了优化,得出界面化学反应的逆向反应速度常数K_(-r) = 4.21 * 10~(-6)(mol/cm~2 s),渣相传质系数K_s(D_((V))/δ s) = 3.23 ~ 3.30 * 10~(-4)(cm/s)。
Other AbstractIn the range of 1450 ~ 1580 ℃, the partition coefficients of vanadium、silicon、manganese、phosphor and sulfur between the melt of Fe-V(Carbon saturated)and slag system of CaO-SiO_2-V_2O_5 were studied. It showed that the partition coefficients of vanadium、silicon、phosphor and sulfur increased with the basicity B((%CaO)/(%SiO_2)), on the countrary, the manganese partition coefficient diminished. While B ≥ 1.2, the tendencies of manganese and surlfur as mentioned were not apparent. Higher the temperature, lower all of the partition coefficients of them. Using solid electrolyte probe, the potential of oxygen in hot metal was measured, furthermore, the activity coefficients of the oxides of vanadium、silicon、manganese and phosphor in slag were calculated. It was obtained that while B was in the range of 0.3 ~ 2.5, the values of γ(V_2O_3)、γ(SiO_2) arid γ(P_2O_5) varied in the range of 10~(-3) ~ 10~(-5), 0.10 ~ 1.40 and 10~(-23) ~ 10~(-27) respectively, all of them increased with increasing of temperature and decreasing of basicity, γ(MnO) increased from 0.6 to 1.7 with temperature also. With increasing of optical basicity, the capacities of vanadium、phosphor and sulfur in slag increased linearly, but the capacity of manganese decreased. There were different effects of temperature on the capacities of vanadium、phosphor and sulfur. The effects of both optical basicity and temperature on them were writhed as follows: LgC_((VO)_2)~(3-) = 13.15 Λ + 35807/T - 22.76 LgC_((PO)_4)~(3-) = 3.631 Λ + 51265/T - 22.301 LgCs = 13.195 Λ - 35807/T - 3.717 The kinetics of reduction of vanadium from the slag of CaO-SiO_2-V_2O_5 system by smelting reduction was studied. It was induced that the process of reduction of vanadium from slag might consist of two limiting steps. At the beginning, it was possible that the interfacial chemical reaction: (VO) + [C] = [V] + CO controlled the reduction of vanadium, gradually, the diffusion of (V_2O_3) in slag might be limiting step. The parameters of kinetics equations were optimized by the simplex method, it was obtained that the inverse reaction rate constant K_(-r) = 4.21 * 10~(-6) (mol/cm~2s); the transfer coefficient of (V_2O_3) in slag K_s = 3.23 * 10(-4) ~ 3.30 * 10~(-4) (cm/s).
Pages62
Language中文
Document Type学位论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/6803
Collection研究所(批量导入)
Recommended Citation
GB/T 7714
刘天中. 钒渣的熔融还原研究[D]. 中国科学院研究生院,1990.
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