共查询到19条相似文献,搜索用时 437 毫秒
1.
2.
冶炼优质钢时广泛采用了用液体渣处理钢水,在出钢时进行渣洗。而厚度为300~400毫米的高温高碱度渣,对半酸性耐火材料起侵蚀作用,显著降低钢包寿命;在真空处理中亦会使真空处理的效果降低。当用氧化渣时,还会增加硅、锰和其它元素烧损,大大阻止真空下碳对钢水脱氧作用。由于钢包耐火层侵蚀程度的变化和其它原因,在钢包中钢水面是波动的;尤其进行真空处理时,在钢包的钢水面上还须留有700~900毫米自由空间,故从溢渣口排渣 相似文献
3.
4.
5.
通过对超高功率电弧炉渣化学成分的统计分析,求出炉衬耐火材料向渣中的熔蚀量,从而定量探讨了炼钢温度、渣碱度对材侵蚀的影响。结果表明:渣碱度增加和出钢温度降低都使材侵蚀降低。用这种方法。也可较客观地评价试用材料的效果。 相似文献
6.
7.
8.
9.
针对宝钢电炉冶炼过程中,炉衬渣线镁碳砖耐火材料侵蚀严重导致电炉炉龄偏低的问题,通过对镁碳砖耐火材料侵蚀微观结构的观察及钼丝炉内炉渣侵蚀镁碳砖试验,得知FeOx·MnO·MgO相是镁碳砖耐火材料溶解到炉渣后形成的主相,渣中FeO、MnO具备了溶解MgO能力,炉渣中FeOx含量偏高是导致镁碳砖耐火材料侵蚀严重的主要因素;电炉炉渣体系内,炉渣碱度对镁碳砖耐火材料侵蚀影响不明显。钼丝炉内炉渣侵蚀试验表明:温度越高,镁碳砖耐火材料侵蚀越严重;高温段保温时间对侵蚀影响不大;渣线镁碳砖耐火材料进行冷热交替试验后,镁碳砖耐火材料侵蚀相对严重。根据试验结果,采取降低炉渣FeOx含量、缩短冶炼过程炉与炉之间间隔时间等措施,炉壁镁碳砖耐火材料侵蚀得到缓解,电炉中期炉龄稳定提升到450炉以上。 相似文献
10.
11.
研究了采用LF精炼顶渣控制技术对钢液进行超低氧冶炼时,钙处理对钢中非金属夹杂物的影响。试验在转炉出钢时采用铝终脱氧,LF精炼过程采用强脱氧、高碱度、强还原性精炼顶渣对钢液进行超低氧冶炼,比较了钙处理和不钙处理的钢液中非金属夹杂物转变的情况。结果表明,采用精炼顶渣控制技术冶炼超低氧钢时,钢液不需要进行钙处理就能实现铝脱氧产物Al2O3→MgO·Al2O3尖晶石→CaO-MgO-Al2O3类复合夹杂物的转变,得到炼钢温度下呈液态的复合氧化物夹杂,这些液态的夹杂物容易通过碰撞长大上浮去除,得到高洁净度的钢液,且残留在钢液的氧化物夹杂为较低熔点的复合氧化物,在浇注过程中不会产生水口结瘤。 相似文献
12.
The influence of calcium treatment on non-metallic inclusions had been studied when control technology of refining top slag in ladle furnace was used in ultra-low oxygen steelmaking. A sufficient amount aluminium was added to experimental heats for final deoxidizing during BOF tapping, and the refining top slag with strong reducibility, high basicity and high Al2O3 in ladle furnace was used to produce ultra-low oxygen steel and the transformation of non-metallic inclusions in molten steel was compared by calcium treatment and no calcium treatment. The results show that the transformation of Al2O3→MgO·Al2O3 spinel→CaO-MgO-Al2O3 complex inclusions has been completed for aluminum deoxidation products and calcium treatment to molten steel is unnecessary when using the control technology of ladle furnace refining top slag to produce ultra-low oxygen steel, and the complex inclusions are liquid at the temperature of steelmaking and easily removable to obtain very high cleanliness steel by flotation. Furthermore, the problems of nozzle clogging in casting operations do not happen and the remaining oxide inclusions in steel are the relatively lower melting point complex inclusions. 相似文献
13.
Inclusions containing Mg existed in low carbon aluminium killed steel even though Mg is not added during LF treatment. To investigate the mass transfer mechanism of Mg in low carbon aluminium killed steel, both industrial practice and kinetic calculations were carried out in the present work. The results from industrial practice showed that Mg concentration in molten steel and inclusions increased with refining time during ladle furnace treatment. The inclusion size tended to become smaller with the increase of Mg concentration in the inclusions. The erosion rate of refractory with different composition was tallied. A refractory-slag-metal-inclusion multiphase reaction model was developed to investigate mass transfer mechanism underlying the variation of Mg among the steel, the slag, inclusions and the refractory. The calculated results exhibited a good predictability of the content of Mg in the molten steel, slag and inclusions. The results showed that Mg dissolved into molten steel in two ways: the first is in the way of slag/steel reaction, the second is in the way of refractory erosion which is the main way. 相似文献
14.
Thechemicalheatingasakindofheatingmethodforladlerefiningispaidmoreandmoreat tention ,suchasinRH KTB ,CAS OB ( PI) ,RH OB[1- 4] etc .Amongthem ,theCAS OBprocessde velopedrapidlyduetoitsabilityofrapidlyraisingtemperatureandaccuratelyadjustingsteelcomposi tion .Butthe… 相似文献
15.
16.
17.
18.
从界面润湿性的角度,对一些冶炼过程中的常见界面现象进行了详细分析.对于渣的泡沫化过程,主要分析了润湿性对渣的泡沫化指数的影响;对于铁水和钢液脱硫过程,主要分析了对脱硫速率和脱硫剂的利用率以及穿透钢液速率的影响;对于钢液与熔渣对耐火材料的侵蚀过程,主要分析了对耐火材料在熔渣中的饱和溶解度、熔渣在耐火材料中的侵蚀深度以及耐火材料的侵蚀速率的影响;对于钢中夹杂物的运动过程,主要分析了对钢中夹杂物的形核、聚集、去除、空间分布等影响.同时,本文总结得出了对于这些实际冶炼过程有利的界面润湿性. 相似文献