共查询到20条相似文献,搜索用时 99 毫秒
1.
2.
铁水脱硫是炼钢工艺的重要组成部分,降低铁水中的硫含量,对提高钢的质量有重要影响。目前,国内铁水脱硫工艺主要有喷吹法和KR法脱硫工艺。喷吹法利用浓相气固两相流的方式将脱硫粉剂输送到铁水罐中与铁水中的硫反应,反应产物进入到铁渣中通过扒渣而除去,达到铁水脱硫的目的。利用喷吹法脱硫效果较好,投资适中,是目前应用最广泛的铁水脱硫技术。 相似文献
3.
根据纯镁铁水脱硫原理,介绍了南钢铁水脱硫工艺特点,分析了铁水脱硫工序铁损及铁水初始硫含量、铁水温度和喷粉速率对脱硫率的影响。 相似文献
4.
5.
6.
分析了太钢铁水预处理脱硫生产工艺中,粉剂、铁水与脱硫率的相关关系,及脱硫处理过程中对铁水温度、成份的影响,并通过计算机进行数据处理,得出了粉剂加入量、铁水原始硫含量与脱硫率的回归方程。 相似文献
7.
8.
永通铸管公司采用铁水喷镁脱硫工艺改善铸管用原料铁水条件,同时对喷镁脱硫效率低的原因进行分析,提出改进措施。通过采取增加脱硫前和脱硫后的铁水扒渣时间、调整镁粉载气压力与下料速度,确定合理的铁水液面高度,重新设置计算机专家系统参数等措施,提高了铁水脱硫率(平均达到了82%),满足铸管用铁水的质量要求。 相似文献
9.
10.
11.
Yeast with defects in vacuolar pH show increased sensitivity to high concentrations of transition metals. This sensitivity has been presumed to result from defective metal storage. We demonstrate that mutations that result in a defective high affinity iron transport system, such as a deletion in the surface ferroxidase FET3, also result in increased metal sensitivity independent of vacuolar function. Multiple copies of transition metal transporter resistance genes, such as COT1 or ZRC1, do not reduce the metal sensitivity of fet3 mutations. Increased metal sensitivity is because of an increased cellular accumulation of transition metals resulting from the increased activity of low affinity iron transporters, such as FET4, that mediates the transport of other transition metals. In cells lacking a high affinity iron transport system, the increased transition metal uptake can be prevented by increased extracellular iron. These results suggest that vacuolar function may not be required for transition metal sequestration. 相似文献
12.
Edmundo Burgos Cruz Eduardo Camargo de Oliveira Pinto Jos Deodoro Trani Capocchi 《国际钢铁研究》1999,70(3):96-104
The technical feasibility of the simultaneous desulfurization and dephosphorization process of hot metal with high basicity slags of the BaO-BaF2 system is discussed from the thermodynamic point of view. The partition ratios as well as the degrees of removal of sulphur and phosphorus from the hot metal obtained after a single refining step with BaO-saturated slags have been compared to those achieved when typical hot metal pretreatment slags of the system CaO-CaF2-SiO2 (double saturated with CaO and 3CaO?SiO2) were used. The experiments were carried out in graphite crucibles at 1573 K, under CO atmosphere. Considering that both the desulfurization degree and the dephosphorization degree of hot metal achieved with BaO-based slags, around 95 %, were much higher than those obtained when CaO-based slags were used, maximum 45 %, it was concluded that the simultaneous desulfurization and dephosphorization process of hot metal with high basicity BaO-BaF2 slags is technically feasible. It has been verified also that the high basicity BaO-based slags led to manganese recovery degrees as high as 86 % and prevented at the same time the undesirable oxidation of carbon from the metal phase. 相似文献
13.
泡沫金属是一种由金属基体和气孔组成的新型结构功能材料,相对于实体金属材料,泡沫金属材料以牺牲了强度等力学性能为代价,获得了诸如热、声、能量吸收、轻质等优越性能,成为一种新型结构功能材料。泡沫铝是一种在铝基体中形成很多气孔的轻质多孔金属材料,同时兼有金属和气泡特征,它密度小、耐高温、防火性能强、抗腐蚀、隔音降噪、导热率低、电磁屏蔽性高、耐候性强、有过滤能力、渗透性好,具有良好的阻尼特性和电磁屏蔽能力,广泛应用在冶金、化工、航空航天、船舶、电子、汽车制造和建筑业等领域。对泡沫铝制备方法和物理性能的研究有利于提高其性能、扩大其应用领域,本文概述了泡沫铝的制备方法、物理性能及增强泡沫铝基复合材料的研究进展。 相似文献
14.
15.
16.
作为金属3D打印的主要耗材,金属粉末对打印产品的质量有着至关重要的影响,航空航天、国防、医疗等领域精密复杂零件的3D打印对粉末性能,如粒度、形貌和纯净度等有着较高的要求。研究并介绍了航空航天领域3D打印用高品质镍基、钴基合金及钛合金等金属粉末的基本要求及主要制粉工艺;对两种常用的高质量金属粉末制备工艺真空感应熔炼氩气雾化法(VIGA)和等离子旋转电极法(PREP)进行了比较,指出VIGA法细粉收得率高,但存在空心粉和卫星粉;PREP粉球形度高、表面光洁、粉末粒度分布窄、流动性好、陶瓷夹杂少,在金属3D打印领域具有独特的优势。为进一步提高PREP粉的质量,应开发更新一代等离子旋转电极雾化制粉技术及装备,提高细粉收得率和生产效率。 相似文献
17.
18.
Iron oxide dust generated during oxygen blowing in the BOF process contains a high content of iron. This iron oxide dust can be used as a material of iron source in the BOF slag reduction process or as de‐siliconisation flux or dephosphorization flux of hot metal pretreatment. One of the most practical uses of iron oxide dust is recycling as a form of pellets in the BOF considering easy application and the amount that can be recycled. In the process of making iron dust pellets cement is used as a binder that contains a lot of calcium sulfate. This calcium sulfate is reduced and dissolved in the molten metal during refining in the BOF. If the oxygen content in slag and molten steel is high enough, the reduced sulfate cannot be dissolved into molten metal and it can be removed as SOx gas. The behaviour of calcium sulfate has been studied using of 50kg high frequency induction furnace and industrial‐scale plant tests were carried out at a 300ton BOF. The results show that for low carbon steels the evaporation of decomposed sulfate increases with increasing oxygen content in the slag while for high carbon steels the decomposed sulfate is reduced into the molten metal. 相似文献
19.
介绍了沙钢润忠90t竖式电弧炉热装铁水技术改造的情况。为实施铁水热装、解决炉料来源,建设了380m^3高炉,并且电弧炉、钢包炉及连铸机也作了相应改造,实现了增产、降耗、高质的目标。 相似文献