The invention discloses a method for quickly eliminating slag bubbles at the end point of converter blowing, which relates to the technical field of iron and steel smelting. The steps are as follows: after the converter stops blowing, part of the slag overflows and a large amount of gas is discharged, the oxygen lance operation mode is quickly selected as \manual\; dolomite is added into the furnace through the converter high-level bin; the oxygen lance nozzle is lowered below the level of the furnace mouth, and nitrogen is blown by the oxygen lance to ensure that the nitrogen jet completely covers the slag surface, and the oxygen lance is closed after 30 seconds of nitrogen blowing; and the oxygen lance is automatically blown by the oxygen lance. When the waiting point is reached, the converter inclines to the tapping side by 30 degrees, and the converter tilts normally, temperature sampling and tapping operation are carried out. The invention first adds dolomite to the furnace, and dolomite decomposes rapidly at high temperature, resulting in CaO and MgO as high melting point substances, which have slag regulating effect and no need to modify the peroxide slag before slag splashing protection; the generated CO2 gas increases the gas nucleation center in the steel, and the CO gas escapes with a large amount of CO2 gas, and then assists with strong stirring effect of nitrogen blowing to expel CO gas rapidly in a short time. To achieve the purpose of rapid defoaming.
【技术实现步骤摘要】
一种转炉吹炼终点渣泡快速消除的方法
本专利技术涉及钢铁冶炼
,尤其涉及一种转炉吹炼终点渣泡快速消除的方法。
技术介绍
顶底复吹转炉通常采取“高拉补吹”炼钢工艺,受低碳钢品种结构、钢包热周转效率以及粗炼钢水终点[S]、[P]含量要求等因素影响,往往造成转炉补吹时间长,转炉终渣及钢水氧化性强,炉内终渣泡沫化程度严重,在转炉倒炉测温取样或出钢操作时,严重泡沫化的炉渣会从炉口涌出,流到炉前平台或炉下钢包车设备,将会产生一系列危害:(1)流到炉前平台的高温炉渣极易烫伤测温取样作业人员;(2)流到等待出钢的钢包内或钢包车设备,容易造成钢水质量事故或生产设备事故;(3)大量溢出的高温炉渣,造成钢铁料消耗增加。此时,若不采取炉渣消泡的措施,需要等待炉内泡沫化严重的炉渣衰弱至一定程度后,才能倒炉测温取样或出钢操作,倒炉时间增加,冶炼周期延长,不能满足炼钢快节奏生产要求。炉渣泡沫化程度严重导致炉口涌渣,炉渣泡沫化根本原因在于:(1)转炉停止吹炼时,炉内钢水中的C-O反应远未达到平衡,仍要继续反应,以致钢水中有过量的CO气体产生溢出,促使炉渣发泡;(2)转炉钢水过氧化时(终点[C]≤0.06%),渣中的(FeO)含量过高(一般可达20%-25%),一方面渣中(FeO)和钢液中的[C]反应产生CO气泡溢出,促使炉渣发泡;另一方面,渣中过高的(FeO)含量降低了炉渣的黏度,使得炉渣表面的张力有利于炉渣泡沫化。目前,常规做法是在转炉吹炼终点渣泡时,通过向炉内加入压渣剂以消除炉渣泡沫化程度。压渣剂消泡,主要分为物理消泡和化学消泡两种工艺:(1)物理消泡工艺,通过向炉内加入冷钢渣, ...
【技术保护点】
1.一种转炉吹炼终点渣泡快速消除的方法,其特征在于,包括以下步骤:(1)转炉停止吹炼后,炉口少量炉渣外溢并伴有大量气体排出,炉内炉渣泡沫化严重,迅速将氧枪操作模式选为“手动”;(2)通过转炉高位料仓向炉内加入白云石;(3)将氧枪喷头降至炉口水平线以下,“手动”开氮气,保证氮气射流完全覆盖渣面,吹氮30s后,停止吹氮;(4)将氧枪自动提至等候点位置后,转炉向出钢侧倾斜30°;(5)转炉正常倾动,进行测温取样和出钢操作。
【技术特征摘要】
1.一种转炉吹炼终点渣泡快速消除的方法,其特征在于,包括以下步骤:(1)转炉停止吹炼后,炉口少量炉渣外溢并伴有大量气体排出,炉内炉渣泡沫化严重,迅速将氧枪操作模式选为“手动”;(2)通过转炉高位料仓向炉内加入白云石;(3)将氧枪喷头降至炉口水平线以下,“手动”开氮气,保证氮气射流完全覆盖渣面,吹氮30s后,停止吹氮;(4)将氧枪自动提...
【专利技术属性】
技术研发人员:邓南阳,潘军,张旭,赵斌,宋磊,
申请(专利权)人:马鞍山钢铁股份有限公司,
类型:发明
国别省市:安徽,34
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。