共查询到19条相似文献,搜索用时 140 毫秒
1.
舞钢在没有铁水预脱磷设备的条件下,为了提高转炉钢冶炼前期的脱磷效率,结合转炉不同吹炼时期特点,通过生产实践,探索高磷铁水顶底复吹转炉双渣法冶炼工艺生产低磷钢的方法,确定了吹炼过程中合理的氧枪枪位和原料投放时机,总结出一倒时间、碱度、温度等关键操作制度,最终开发出直接利用高磷铁水生产低磷钢的转炉双渣法冶炼工艺技术,满足了低磷钢种对钢水洁净度的要求,达到了降本增效的目的。 相似文献
2.
3.
针对莱钢用高磷铁水冶炼高碳低磷钢容易出现终点碳过低和终点磷超标的问题,通过将脱磷渣碱度控制在1.5左右,实行双渣留渣工艺,提高前期底吹强度改善动力学条件,使用无氟化渣剂和增上滑板挡渣优化挡渣效果等措施,实现了高磷铁水冶炼低磷钢的高效生产。其中,终点磷质量分数可稳定控制在0.010%以下,脱磷率由89.80%提高到94.67%,终点碳质量分数控制在0.15%以上,钢水氧化性降低,钢包渣厚降低了40mm,精炼成白渣时间减少,满足了高碳低磷钢洁净度的要求,取得了良好的经济效益。 相似文献
4.
5.
6.
7.
在济钢条件下,采用常规的铁水脱硫加转炉双渣的冶炼工艺生产低磷钢,很难将成品w(P)稳定控制在0.010%以下。基于转炉双渣大渣量生产试验,采用回归分析研究了影响冶炼过程脱磷效率的主要因素,确定了最佳的双渣吹炼时间、过程温度和炉渣成分控制,大幅度提高了冶炼过程的脱磷效率。该工艺在9Ni、高级别管线(X90/X100)的生产中得到广泛应用,成品w(P)稳定控制在0.006%以下,最低达到了0.004%,实现了低磷钢的批量生产。 相似文献
8.
9.
10.
11.
12.
13.
Double slag process was adopted to produce low-phosphorus steel from middle-phosphorus hot metal.To achieve a stable dephosphorization operation,conventional process was modified as follows:the blowing time was extended by approximately 1min by reducing the oxygen supply flow rate;calcium ferrite pellets were added to adjust the slag composition and viscosity;the dumping temperature was lowered by 30-50°C by the addition of calcium ferrite pellets during the double slag process to prevent phosphorus in the slag from returning to the molten steel;and the bottom-blown gas flow was increased during the blowing process.For 40 heats of comparative experiments,the rate of dephosphorization reached 91% and ranged between 87% and 95%;the phosphorus,sulfur,manganese,and oxygen contents calculated according to the compositions of molten steel and slag as well as the temperature of molten steel at the end-point of the basic oxygen furnace process were similar to the equilibrium values for the reaction between the slag and the steel.Less free calcium oxide and metallic iron were present in the final slag,and the surface of the slag mineral phase was smooth,clear,and well developed,which showed that the slag exhibited better melting effects than that produced using the conventional slag process.A steady phosphorus capacity in the slag and stable dephosphorization effects were achieved. 相似文献
14.
15.
16.
17.
18.
《钢铁研究学报(英文版)》2011,(Z2):52-58
As the market demand for clean steel increased,a number of new technologies for clean steel production have been developed in some domestic and foreign steelmaking plants.Based on the existing equipments and technical conditions in the No.1 steelmaking plant of Ansteel,a series of clean steel technologies have been integrated including single bay duplex-dephosphorization in steelmaking control technology,high efficiency desulfurization technology,the control technology for nitrogen content during the whole process,the control technology for hydrogen content in VD,and the systematic control technology for oxygen content.A series of process for all kinds of ultra-low phosphorus,ultra-low sulfur and relative low level of inclusions have been designed in clean steel production.This process include hot metal desulfurization and slag-off,single bay duplex-dephosphorization in BOF,molten steel slag-off,LF processing,VD processing,and continuous casting with protection,then a stable,low-cost and large-scale production process has been formed.Applying this integrative technology,the sum of 5 major elements including phosphorus,sulfur,oxygen,nitrogen,hydrogen is less than 80×10-6 in high alloy steel scale production,and the industrial applications for clean steel technology have been achieved. 相似文献
19.
针对钢渣尚未有效资源化利用的情况,以磷元素为中心对钢铁厂磷素流从矿选、烧结(球团)、炼铁、炼钢工艺上进行了全生命周期的梳理,重点分析了首钢京唐公司生产过程中磷素流路径,利用平衡的手段,研究了磷元素的分配规律和富集规律,并对生产过程磷素流的优化进行了探讨。认为可通过生产流程整体优化来降低铁水磷含量,实现钢渣的减量化,并利用冶金技术将富磷的钢渣和矿选尾矿等制备成矿渣、铁水和磷酸铁等产品来实现钢渣资源化利用。 相似文献