共查询到17条相似文献,搜索用时 171 毫秒
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返回转炉钢渣对铁水脱硅、脱磷的影响 总被引:7,自引:1,他引:6
在实验室条件下,模拟转炉钢渣的组成,利用CaO-SiO2-Fe2O3-MnO2-MgO-P2O5-Al2O3-CaF2系熔剂对铁水进行预处理,研究了转炉钢渣组成和渣中添加BaO对铁水脱硅和脱磷的影响。结果表明,通过控制转炉钢渣的组成可获得约75%的脱硅率和80%左右的脱磷率。脱硅过程伴随有铁水的回磷反应。随Fe2O3含量增加,回磷率提高,最大回磷率可达22.5%。此外,分析了铁水回磷原因和防止回磷的,发现使用添加BaO的转炉钢渣对脱硅后的铁水进行脱磷处理,当BaO添加量控制在15%-20%范围内时,可明显提高铁水的脱磷率。 相似文献
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钢中的磷是由矿石、废钢、生铁及其它铁合金带入的。钢材的磷脱格是由于冶炼中脱磷不彻底,对冶炼后期的返磷估计不足而造成的。脱磷任务主要在氧化期完成,是氧化期主要的物化反应内容的组成部分。 1 氧化期脱磷反应的特点 1.1 脱磷与脱碳的关系 二者部是氧化反应,在强制氧化钢液时都需要氧,加入矿石以后,氧通过炉渣向钢液溶解,同时产生碳氧反应和脱磷反应。C—O反 相似文献
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利用转炉渣对铁水脱磷的动力学 总被引:1,自引:0,他引:1
在实验室条件下,模拟转炉渣组成,利用CaO-SiQ-Fe2O3-MnO2-MgO-P2O5-Al2O3-CaF2系熔剂对铁水进行脱磷预处理。实验发现:随着预处理时间的延长,铁水发生回磷反应。在铁水回磷状态下,测定了磷在渣中的传质系数。讨论了回磷原因和抑制铁水回磷反应的措施。在此基础上,确定了合适的铁水脱磷预处理时间和转炉渣的优化组成。 相似文献
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探讨了MgO-CaO、MgO-Al2O3和Al2O3-MgO耐火材料对82B钢中磷的影响。利用化学分析、图像分析、扫描电镜和能谱分析等检测手段测定了82B钢水在中频炉中经1450℃熔炼80min后耐火材料内衬成分变化及钢中磷的变化,还探讨了MgO-Ca0材料的脱磷机理。结果表明,MgO-CaO材料中的游离CaO能吸附钢中磷,达到脱磷效果,其中CaO含量30%的材料脱磷效果最佳达61%。 相似文献
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LiO2对CaO—SiO2—MgO—Fe2O3—MnO2—P2O5精炼渣系脱磷的影响 总被引:1,自引:1,他引:0
在LiO2替代CaO-SiO2-MgO-Fe2O3-MnO2-P2O5精炼渣系中部分CaO的条件下,研究了LiO2含量、碱度及氧化性对钢液磷含量的影响。结果表明,在LiO2=15%,碱度(CaO LiO2)SiO2为2.0-2.5(Fe2O3 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0.009%以下。 相似文献
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通过热力学计算和实验室试验,考察了BaO和Na2O对LF还原渣系磷容量的影响,试验结果表明,精炼渣中加入一定量BaO和Na2O可减少钢不回磷量。 相似文献
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分析了高级别管线钢中碳磷硫对钢材质量的影响,通过对钢液中[C]、[P]和[Fe]选择性氧化的热力学理论分析,计算出转炉终点温度在1 640℃时,当碳低于0.06%时,继续供氧,氧气将优先与[P]反应生成(P2O5),能够实现熔池的深脱磷;但当碳低于0.04%时,继续供氧,氧气将直接与[Fe]反应为主,造成钢水过氧化,甚至发生回磷现象。通过优化拉碳工艺、优化铁水预处理脱硫工艺、控制转炉回硫、LF渣系等,实现了高级别管线钢成品w[C]≤0.05%,w[P]≤0.012%,w[S]≤0.001 5%的稳定生产工艺。 相似文献
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�Զ�ΰ����������������£���С�� 《钢铁研究学报》2017,29(12):997-1005
RH oxygen top- blowing for raising temperature should be avoided to improve the cleaniness of IF steel as far as possible, which made the end point temperature of converter higher and then dephosphorization in converter became difficult. Thermodynamics and dynamics of dephosphorization process in converter were calculated to study the relationship of phosphate partition ratio to compositions of molten steel, slag, temperature in molten steel based on slag- remaining and double slag process. Through changing the first deslagging time and the composition of slag,then serial sampling from molten steel and slag in industrial production experiments, the behavior of phosphorus in molten steel was studied and then the main measures obtaining higher phosphate partition ratio in slag- remaining and double slag process are: small- sized scrap or thin steel sheet should be used to increase FeO content in slag and prevent molten steel temperature increase when oxygen blowing in converter begins. Slag with high phosphorus content should be poured when amount of oxygen blowing reachs 40% of the total; FeO content in slag should be increased to assure the mobility of slag and then reduce rephosphorization from slag to steel when amount of oxygen blowing is greater than 40% and less than 80% of the toal; the end- point slag with 4. 0 basicity and 18 mass%-20 mass% FeO content and molten steel temperature should be controlled. 相似文献
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为了获得最佳的供氧和粉剂消耗与温度的关系。国内某钢厂采用专用炉顶吹氧+喷粉搅拌脱磷工艺为AOD炉提供优质的低磷铁水冶炼不锈钢,实现了新型一步法冶炼不锈钢工艺。生产实践表明,随着喷吹钝化石灰粉和铁皮球用量的增加,脱磷率逐渐升高,当石灰喷吹量为10~12 kg/t、铁皮球消耗量为25.0~37.5 kg/t、供氧量为300~400 m3时,脱磷率在85%以上;脱磷率随着钙氧比的增大而减小,当w(CaO)/w(Fe2O3)为0.8时达到最大值,钙氧比为0.8~1.4时脱磷率大部分在85%以上,钙氧比超过1.4时效果降低。 相似文献
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Dephosphorization reaction of hot metal by Na2CO3 has been studied experimentally to determine the reaction mechanism and thermodynamics. Most of the experiments were carried
out at 1300 °C using Fe-Csat.-Si-P-S alloys. The results indicate that the CO2 gas released from Na2CO3 is important in the dephosphorization reaction as an oxidizer and increasing mass transfer by stirring the slag and metal.
As the initial Si content in hot metal is increased, the degree of dephosphorization decreases significantly and the rephosphorization
takes place earlier. The primary reason for the rephosphorization is that the activity of PO2.5 increases in the slag because of the evaporation of Na2O from the slag. The loss of Na2O increases the activity coefficient of PO2.5 and decreases the slag volume. At the later stage of Na2CO3 treatment, the reactions reach equilibrium with respect to phosphorus and sulfur, and the oxygen potential,P
o2, at the slag-metal interface is determined by the C-CO equilibrium (a
c=1 and 1 atm CO). The presence of sulfur in the metal increases the rate of the dephosphorization because of the electrochemical
nature of the reaction; sulfur transfer to the slag accepts the electrons from phosphorus transfer. 相似文献