共查询到20条相似文献,搜索用时 932 毫秒
1.
2.
通过研究转炉出钢口的损坏机理,找出了出钢口寿命低的主要原因。通过采取优化出钢口热换工艺、优化出钢口尺寸和材质、提高出钢口填料性能、降低出钢温度、推广挡渣挂渣技术等措施,提高了出钢口寿命。 相似文献
3.
4.
介绍了上海梅山钢铁股份有限公司炼钢厂150 t转炉挡渣工艺。使用挡渣帽和挡渣塞双挡渣并配合下渣检测仪联合使用模式,可以控制钢水回磷质量分数在5×10-6左右;提高出钢口使用寿命,冶炼IF、SPHC和H-235P钢时,出钢口平均使用寿命可以分别达到98、110和117炉;减少每炉下渣量约100 kg,提高了钢水洁净度。 相似文献
5.
6.
7.
8.
9.
10.
11.
12.
为实现“全三脱”工艺少渣冶炼,进一步降低辅料消耗,首钢京唐开发了热态脱硫渣、液态脱碳渣及铸余渣钢直接返回利用工艺。对热态渣、钢的可回收性进行了分析,并通过工业试验验证了工艺的应用效果。结果表明,回收利用5 t的脱硫渣,脱硫剂消耗可降低30%~40%,铁水温降相对减少10~15 ℃,总渣量减少30%~40%,同时可降低铁损,减少对环境的污染;对于脱碳渣,每炉回收热态渣20 t,可节约石灰3.2 t,若铁水硅质量分数小于0.15%,脱磷炉可不加石灰,钢铁料消耗相应减少2.4 kg/t,并且可取消萤石及轻烧的使用,可实现脱磷炉零辅料消耗;对于钢包铸余,通过控制高炉出铁量,将精炼工序RH/LF/CAS产生的热态精炼渣及钢包铸余兑入半钢包,连同半钢一起兑入脱碳炉中进行冶炼,铸余钢回包次数可达到6~8次,实现液态铸余直接回收。 相似文献
13.
Jong-Leng Liow Mikko Juusela N. B. Gray I. D. Šutalo 《Metallurgical and Materials Transactions B》2003,34(6):821-832
Entrainment through a taphole of a two-layer system has been investigated. The results showed that for liquids with low viscosities,
the minimum dimensionless clearance from the taphole before entrainment occurs can be predicted theoretically and was related
to the Froude number as Fr0.4. At low Froude numbers less than 1, fluids with low viscosities resulted in the entrainment showing a positive deviation
from the critical Froude number. This allowed tapping to be carried out without entrainment occurring, even when the liquid-liquid
interface was within the region of the taphole diameter. For liquids with appreciable viscosities, the entrainment showed
a negative deviation from the critical Froude number. This occurs for the tapping of slag and results in entrainment at a
higher liquid-liquid interface height than is predicted theoretically. Entrainment was more likely to happen for slag tapping
than for matte tapping. A ledge below the taphole was found to reduce entrainment, enabling the liquid-liquid interface to
be closer to the taphole during tapping. This resulted in improved slag removal efficiencies and reduced matte or metal entrainment,
coupled with less slag left in the furnace after tapping. The length of the ledge from the taphole into the slag was found
to be the controlling parameter for entrainment, while the ledge thickness had no effect on entrainment. 相似文献
14.
15.
16.
莱钢采用BOF-LF-CC工艺流程生产20CrMnTiH齿轮钢,在不经过VD炉真空处理的情况下,通过提高转炉终点碳命中率,使用组合式挡渣工艺,优化转炉底吹流量及钢包底吹氩模式,转炉全铝一次脱氧,调整精炼渣系,提高大包长水口密封性,避免钢水吸氧二次氧化,引进钢包下渣自动监测系统等工艺优化改进措施,有效降低了铸坯全氧含量,平均铸坯全氧含量达到了0.001 3%。 相似文献
17.
18.
19.
20.
邢钢一步法(脱磷站+60t AOD+60t LF)生产400系易切削不锈钢过程中,前期采用硫铁全部在AOD出钢时加入配[S],AOD出钢至上机浇铸过程中钢渣碱度始终处于低碱度范围(R=1.40~1.95),硫铁消耗较大,钢液氧含量偏高,随着冶炼炉数的增加,炉衬侵蚀严重,影响AOD炉龄和钢坯质量,且钢渣较长时间处于低碱度状态,极易造成钢中[C]含量的上升(尤其是430F、430FR低碳类钢种),很难实现多炉连浇。后期通过优化硫铁加入方式,在LF后期加硫铁,AOD炉渣碱度2.0~2.3,LF炉渣碱度1.6~2.0,缩短低碱度渣处理时间,降低[S]损耗和钢液氧含量及对炉衬侵蚀。使易切削不锈钢[S]的收得率由62%提高到75%,吨钢硫铁消耗下降2.12 kg,铸坯皮下气泡等缺陷得到控制。 相似文献