Li2O对低氧化性钢包渣改性处理的实验研究

通过模拟低氧化性钢包渣组成,采用CaO-SiO2-Fe2O3-MnO2(2%)-MgO(6%)-P2O5(3%)系熔剂,在CaO/SiO2≤2.5,Fe2O3≤5%的范围内,用Li2O替代熔剂中CaO,测定Li2O对熔剂熔点和熔剂控制钢液回磷能力的影响。     

向CaO基熔剂中添加Li_2O,Na_2O,K_2O和BaO对钢水回磷控制效果的影响

在 18 5 3K温度下 ,用强碱性氧化物 L i2 O,Na2 O,K2 O和 Ba O分别替代 Ca O- Si O2 - Fe2 O3-Mn O2 - Mg O- P2 O5 系熔剂中的部分 Ca O,进行钢水回磷控制实验。结果表明 ,上述添加剂影响钢水脱磷效果的强弱顺序为 :L i2 O>Na2 O>K2 O>Ba O。推荐 L i2 O作为 Ca O基实验熔剂的首选添加剂。确定钢水回磷控制用 Ca O 基熔剂的优化组成为 :W( Ca O+ L i2 O) / WSi O2 =2 .5 ,WL i2 O=15 % ,W( F e2 O3+ Mn O2 ) ≥ 2 %。当 W( F e2 O3+ Mn O2 ) =2 %时 ,采用上述组成的熔剂可获得 48.1%的脱磷率。向Ca O基熔剂中添加 10 %～ 30 %的 L i2 O后 ,其磷酸盐容量 lg Cp 为 2 0 .32± 0 .2 2 ,比未添加 L i2 O时Ca O基熔剂的最大磷酸盐容量值增加了 0 .5～ 1.0个数量级     

Li2O、Na2O、K2O、BaO对CaO基钢包渣系性能影响的实验研究

为改善钢包渣性能以控制钢包中钢液回磷,以Li2O、Na2O、K2O、BaO作添加剂替代模拟的CaO基钢包渣系中等质量的CaO，研究添加剂对渣系的熔点、粘度和脱磷能力的影响，并推荐Li2O作为CaO基钢包 渣系的添加剂。     

低铬铁水脱磷渣系熔化特性实验研究

研究了低铬铁水脱磷粉剂的熔化性能,通过二次回归正交实验,考察了BaCO3等其它组成对该渣系熔点及熔速的影响.研究结果表明:21.5?O-15 ?oCO3-40 ?2O3-12.5 ?F2-5 %Cr2O3-6%镁铬砖熔剂熔点较低,为1170℃;熔化速度较快,为3 min,能快速成渣且温降较低.     

Li2O对CaO-SiO2-MgO-Fe2O3-MnO2-P2O5精炼渣系脱磷的影响

在Li2 O替代CaO SiO2 MgO Fe2 O3 MnO2 P2 O5精炼渣系中部分CaO的条件下 ,研究了Li2 O含量、碱度及氧化性对钢液磷含量的影响。结果表明 ,在Li2 O =15 % ,碱度 (CaO +Li2 O) /SiO2 为 2 .0～ 2 .5 ,(Fe2 O3 +MnO2 )为 7%的条件下 ,该渣系对钢液的脱磷率在 70 %以上 ,控制钢液磷含量在 0 .0 0 9%以下。     

Li_2O对钢包精炼渣的调质处理

为减少钢包合金化精炼浸渍罩粘渣,以Li2O作调质剂对钢包顶渣调质处理,研究Li2O对钢包顶渣的熔化温度、黏度及脱硫能力的影响。半球法熔化温度测定结果表明:Li2O的助熔效果明显,当其加入量为5%时,渣熔化温度从调质前的1439℃降至1300℃;旋转柱体法黏度测试结果表明:钢包顶渣的黏度高以及合金化精炼处理后顶渣黏度进一步升高,是造成浸渍罩粘渣的主要原因,Li2O能有效降低精炼处理后钢包顶渣的黏度,在1500℃时,未调质的钢包顶渣黏度约为6.5 Pa.s,调质后渣的黏度低于2 Pa.s。调质处理后的钢包渣不会引起钢液的回硫,并可使钢中硫的含量进一步降低。     

B2O3对CaO基渣精炼的助熔作用和脱硫的影响

使用RTW-08熔体物性测定仪通过旋转粘度计法测定了熔渣的粘度.试验结果表明,B2O3和CaF2在46%CaO-10%BaO-11.2%SiO2-11.6%Al2O3基础渣系中的助熔效果相当;在CaO-SiO2-10%BaO-11.6%Al2O3-10%CaF2基渣的碱度(CaO+BaO)/(SiO2+B2O3)为2.5和2.8时,用B2O3替代1/4 SiO2后精炼渣高温熔化性能稳定,粘度值降低至0.3～0.5 Pa·s;碱度2.8时,含20.6%SiO2渣剂的脱硫率为85%(S含量由0.008%降至0.001 6%),而含10.3%SiO2-10.3%B2O3渣剂的脱硫率为91.3%(S含量由0.008%降至0.000 7%).     

向CaO基熔剂中添加Li2O,Na2O,K2O和BaO对钢水回磷控制效果的影响

在1853K温度下,用强碱性氧化物Li2O,Na2O,K2O和BaO分别替代CaO-SiO2-Fe2O3-MnO2-MgO-P2O5系熔剂中的部分CaO,进行钢水回磷控制实验.结果表明,上述添加剂影响钢水脱磷效果的强弱顺序为Li2O＞Na2O＞K2O＞BaO.推荐Li2O作为CaO基实验熔剂的首选添加剂.确定钢水回磷控制用CaO基熔剂的优化组成为W(CaO+Li2O)/WSiO2=2.5,WLi2O=15%,W(Fe2O3+MnO2)≥2%.当W(Fe2O3+MnO2)=2%时,采用上述组成的熔剂可获得48.1%的脱磷率.向CaO基熔剂中添加10%～30%的Li2O后,其磷酸盐容量lgCp为20.32±0.22,比未添加Li2O时CaO基熔剂的最大磷酸盐容量值增加了0.5～1.0个数量级.     

B2O3作助熔剂对CaO基精炼渣系熔化温度的影响

研究了B₂O₃对低碱度[(CaO)/(SiO₂)=3～4]和高碱度[(CaO)/(SiO2)=5～7.5]两个系列CaO基精炼渣熔化温度的影响。结果表明,用B₂O3比用Al₂O₃和CaF₂更有效降低CaO基精炼渣系的熔化温度,对低碱度渣系,B₂O₃替代渣中的部分CaF₂、Al₂O₃以及SiO₂,都能有效降低渣的熔化温度;对高碱度渣系,B₂O₃替代CaF₂作助熔剂时,可实现在高(CaO)/(SiO₂)和(CaO)/(Al₂O₃)下造具有超低熔化温度的CaO基精炼渣,既可提高造渣速度,又可提高渣的脱硫磷能力和吸收硅、铝脱氧产物的能力。     

BaO 和 Li2O 对 CaO 基脱硫精炼渣熔点和粘度的影响

以CaO(bal)-SiO₂(22.4%)-Al₂O₂(11.6%)-CaF₂(10%)精炼渣作为基础渣系,用BaO、Li₂O替代其中等量的CaO含量,固定(CaO+RxO)/SiO₂=2.5(RxO代表BaO或者Li₂O),对该脱硫精炼渣系的熔点和粘度进行了研究。结果显示在传统的CaO基熔渣中加入BaO、Li₂O可以降低渣系的熔点和粘度,有效地改善了渣钢反应的动力学条件。当(BaO,Li₂O)=15%时,熔渣的熔点分别为1267℃和1185℃,远低于不加添加剂时的熔点1326℃,当温度为1475℃时,熔渣粘度分别为0.98Pa·s和0.51Pa·s,远小于不加添加剂时的粘度1.79Pa·s,使渣系具有良好的流动性和熔化性能。     

Thermodynamic Study on BaO-CaO-CaF2 Slags for Dephosphorization of Molten Steel

Phosphorusisadetrimentalelementforsome kindsofsteel.Itiseasilysegregatedinthegrain boundaryduringthesolidificationofsteelresulting inthecold brittleness.Italsoreducesthemechani calpropertyofsteel[1].Inrecentyears,ultralow phosphorus,e.g.below0.01%or0.005%…     

钢包渣光学碱度的变化与回磷关系的浅析

本文通过对下渣炉次钢包渣在脱氧、精炼造渣、吹氩条件下渣子光学碱度的变化,分析了钢水回磷量与光学碱度的关系。通过分析表明钢包渣光学碱度的变化在不同阶段对钢水回磷量的影响是不同的,利用光学碱度理论计算的回磷量与实际检验结果符合较好。由此提出在转炉下渣条件下,控制钢包渣光学碱度来控制回磷的几点措施。     

Effect of Strong Basic Oxide (Li_2O, Na_2O, K_2O and BaO) on Property of CaO-Based Flux

Intraditionalconvertersteelmakingprocess ,therephosphorizationofliquidsteelcausedbyladleslagstakesplacebecausetheoxidabilityandbasicityofslagsaredecreasedwhenthedeoxidizingandal loyingoperationsofsteelarecarriedoutinladle .Atpresent ,mainmeasuresofcontrollingrephosphori zationincludeincreasingoriginalbasicityandoxid abilityofslags ,whichcanincreasethemeltingpoint ,viscidityofslagsandtheamountofworkfordeoxidizationandalloyforalloying .Atthesametime ,theslagswithhighoxidabilityincreasetheox ygen…     

Effect of Cr2O3 Addition on Sintering Behavior of Novel Chromite-Based Ladle Filler Sand

Developing novel filler sands has garnered significant interest in improving the ladle's free-opening rate and enhancing the cleanliness of high-Mn and high-Al steel. Laboratory studies explore the effect of adding Cr₂O₃ powder on the sintering behavior of chromite-based filler sands. Furthermore, interfacial phenomena are examined between the sands and the steel grades, varying in Mn contents. The results demonstrate that adding Cr₂O₃ power plays a role in inhibiting the liquid phase formation in the sand. With a 16% addition, the steel (Mn mass% = 30) reacts with the sand, leading to the shape of a spinel phase, specifically (Mn, Fe, Mg)O·(Al, Cr)₂O₃, which facilitates the separation of the liquid phase. The reduction of FeO to Fe by Mn, Al, and C in steel, especially Al, is hindered by adding Cr₂O₃, resulting in a suitable sintering degree that ultimately benefits ladle free-opening. SiO₂ is crucial for forming the liquid phase during the sintering process. The SiO₂ content of the sand should be about 20% to achieve optimal sintering effects. Chromite sand for casting is not suitable for the steels. The mixed sand presented in the current study demonstrates potential as a suitable filler sand for the steel (20 ≤ Mn mass% ≤ 30).     

Effect of Additives on Melting Point of LATS Refining Ladle Slag

  To avoid slag sticking on the ladle immersion cover during the LATS refining and alloying process, the effect of Al2O3 on the melting point of the ladle slag was studied and the additives including CaF2, B2O3, Li2O, and CaO were used to decrease the melting point of the ladle slag. The melting point was measured using the hemisphere method. The results show that the addition of Al2O3 to the ladle slag increases the melting point. The fluxing action is not remarkable if only CaF2 or CaO is used as the additive. The fluxing action of the composite additive obtained by the mixing of CaO and CaF2 in the mass proportion of wCaO∶wCaF2=2∶1 is preferred. The fluxing action of B2O3 is also notable. When the B2O3 content in mass percent is in the range from 2% to 10%, the corresponding melting point is 1 380 ℃ to 1 290 ℃. The fluxing action of Li2O is the most remarkable. When the Li2O content is up to 5%, the melting point of the slag is lower than 1 300 ℃.