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LI Jing HUANG Kexiong CHEN Xinmin Central South University of Technology Changsha China 《金属学报(英文版)》1989,2(12):386-391
The interfacial tension between FeO-CaO-SiO_2-MgO system slag and Cu-Fe-S systemmatte was determinated by the X-ray radiograph sessile drop method.The effects ofFeO/SiO_2 ratio in the slag,contents of CaO,FeO,ZnO and CaF_2 in the slag on interracialtension and the relation of inter facial tension with the grade of matte and temperature havebeen studied.The floatation coefficient and film coefficient of slag-matte system has beencalculated and the mechanism of the transition of iron and oxygen from slag to matte has alsobeen discussed. 相似文献
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本次对高炉内氟的变化的研究,系在石景山钢铁厂内11M~3高炉上进行,试验结果证实了前一文中关于1M~3实验高炉内氟变化情况的结论,即煤气中氟与石灰或石灰石间接近平衡,而与温度的分布有很大关系。本次度验取得炉料样品较多,因此对氟从矿石中和熔渣中的挥发机理有所阐明,而对氟在高炉内的变化获得了较为完整的概念。 相似文献
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针对太钢(TISCO)430不锈钢连铸坯表面存在结疤、凹陷等质量问题,采用半球点熔点仪、黏度仪、扫描电镜等方法,系统研究了保护渣理化性能、连铸结晶器振动参数以及冷却强度对表面缺陷的影响。结果表明,保护渣黏度低、结晶性能弱是造成铸坯表面缺陷的主要原因。为此,通过优化保护渣的化学成分,将保护渣的黏度由0.20提高至0.33 Pa·s,改善了渣膜的均匀性;碱度由1.00提高至1.16,提高了保护渣控制传热的能力。从而消除了铸坯结疤、凹陷等缺陷,实现了铸坯无修磨。同时,受保护渣中氟含量和黏度的影响,浸入式水口的寿命明显提升,连浇炉数由10炉提高到12炉。 相似文献
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研究了在1723K下CO还原CaO-SiO_2-A1_2O_3-Fe_tO渣系。根据CO_2红外分析仪测定的出口气体中CO_2浓度变化,计算了炉渣的表现还原速度常数K_a和还原速度常数K。结果表明,加入Al_2O_3,提高了CaO-SiO_2-Fe_tO的K_a和K值;炉渣碱度不变时,随着Fe_tO含量的增加,K_a呈增加趋势,但K则呈抛物线趋势变化;当FeO的光学碱度∧_FeO为1.0或0.87时,K_a随该四元渣系光学碱度的增加而线性增加,而K则呈递减趋势。用炉渣规则溶液模型计算了CaO-SiO_2-Al_2O_3-Fe_tO四元渣系的Fe_tO活度a_Fe_tO。 相似文献
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The experimental results of niobium enrichment in laboratory and in blast furnace in Baotou Iron andSteel Corporation were reported.The effects of temperature,constituents of slag and silicon content in hotmetal on niobium recovery were studied and the results have been verified by blast furnace operation.Opticaland electronic microscopy and EPMA was observed that at the metal-slag interface there is NbC deposit layerobstructed Nb entering into the metal,By raising the temperature of hearth and agitating the bath,the reduc-tion of niobium oxide in slag could be speeded up,the solubility of Nb in hot metal could increase and thedeposited NbC layer became thinner and even disappeared,in result,Nb recovery was increased.A compre-hensive extraction process combining ore dressing with pyro-hydro-metallurgy was suggested for Baotouniobium resource which was difficult to be concentrated formerly.The methods of increasing niobium recoverywere also suggested. 相似文献
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DU Hegui ZOU Anhua Northeast University of Technology Shenyang China Du Hegui Professor Department of Ferrous Metallurgy Northeast University of Technology Shenyang China 《金属学报(英文版)》1992,5(7):1-7
A study was carried out on the formation of Ti(C,N) during smelting vanadium-bearingtitanomagnetite in blast furnace and the influence of MnO content on reduction of TiO_2 inthe slag containing high titania. The reduction of TiO_2 is restricted by MnOpredominantly atthe slag-metal interface and no more at the slag-coke one. The formation of Ti(C,N) is remarkablyrestricted by MnO in the slag when the MnO content is about 4% and the basicityfrom 0.6 to 1.2 in the slag. MnO may also retards the reduction of SiO_2 and accelerates thedesulphidation under certain condition. 相似文献
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高炉型含钛炉渣中MnO对TiO_2还原的影响SCIEI 总被引:3,自引:0,他引:3
研究了高炉冶炼钒钛磁铁矿时Ti(C,N)的生成规律以及高钛渣中MnO对TiO_2的影响。结果表明,高钛渣中MnO对抑制TiO_2还原在渣-焦处作用不大,而主要在渣-铁处,渣中含MnO4%左右,碱度0.6—1.2能显著抑制Ti(C,N)的生成,(MnO)在一定条件下还能显著抑制(SiO_2)的还原,加速脱硫反应。 相似文献
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精炼渣泡沫化的实验研究 总被引:1,自引:0,他引:1
在硅钼炉和感应炉中,对精炼炉熔渣CaO-SiO2-MgO-Al2O3-CaF2渣系的发泡性能进行了实验室研究,测试不同熔渣碱度、温度、发泡剂成分等对熔渣发泡效果的影响,并讨论了熔渣的表面张力和粘度等物性与熔渣泡沫化程度的关系。 相似文献
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Present-day knowledge of the structure and physical properties of metallurgical slags is summarized to address structure-property and inter-property relationships. Physical properties of slags including viscosity, electrical conductivity, and surface tension is reviewed focusing on the effect of slag structure, which is comprehensively evaluated using FT-IT, Raman, and MAS-NMR spectroscopy. The effect of the slag composition on slag structure and property is reviewed in detail: Compositional effect encompasses traditional concepts of basicity, network-forming behaviors of anions, and secondary impact of network-modifying cations. Secondary objective of this review is elucidating the mutual relationship between physical properties of slags. For instance, the relationship between slag viscosity and electrical conductivity is suggested by Walden’s rule and discussed based on the experimental results. Slag foaming index is also introduced as a comprehensive understanding method of physical properties of slags. The dimensional analysis was made to address the effect of viscosity, density, and surface tension on the foaming index of slags. 相似文献
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钢包加盖能够显著提升钢包的保温效果,助力钢铁企业节能降耗。但钢包加盖条件下顶渣温度较高、流动性好,更易引起浇注末期旋涡卷渣,铸坯夹渣缺陷率升高。开展了顶渣改质抑制旋涡卷渣的工艺研究,以高碱度渣为研究对象,通过相图分析确定了炉渣改质增黏的基本思路,利用FactSage软件对多组改质渣系进行黏度计算。结果表明,添加石灰或轻烧白云石都有助于增大炉渣黏度,两者增黏效果相近,炉渣黏度测量试验也验证了上述结论。利用BaCO3示踪法开展了顶渣改质的工业试验,结果表明,炉渣改质后钢中大尺寸夹杂物数量大大减少。顶渣改质新工艺在现场应用后,铸坯平均夹渣缺陷率由0.57%降低至0.42%。 相似文献
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<正> 一、前言 在铸造上应用土高炉生产的高硫生铁有着很多困难。首先是它能够促使铸铁铸态成为硬而脆的白口组织,不能加工和应用;其次它使铸铁铸造性能恶化,铸造废品率大大增加。为了解决土铁在铸造上应用的问题,通常采取二种办法: (一)利用高硫:当铸铁的S/Mn>1时,将铸态所得的白口胚件,经过短时间的退火,使自由渗碳体分解石墨化,而得到球状石墨的所谓球墨可锻铸铁; (二)去硫:使铸铁中含硫量降到0.10%左右,以符合一般铸铁含硫量的标准。 第一种方法应视为一种不得已的措施,因为它并没有能够彻底的解决问题。首先它并没有能解决高硫铸铁的铸造性能不良的问题;其次采用退火的办法增加了燃料、工时及 相似文献
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Chao Lv Kun Yang Shu-ming Wen Shao-jun Bai Qi-cheng Feng 《JOM Journal of the Minerals, Metals and Materials Society》2017,69(10):1801-1805
This paper proposes a new technique for preparation of high-grade titanium slag from Panzhihua vanadium titanomagnetite concentrate by reduction–melting–magnetic separation processing. Chemical analysis, x-ray diffraction, and scanning electron microscopy in conjunction with energy-dispersive spectroscopy were used to characterize the samples. The effective separation of iron and titanium slag could be realized by melting metallized pellets at 1550°C for 60 min with the addition of 1% CaO (basicity of 1.1) and 2% graphite powder. The small iron particles embedded in the slag could be removed by fine grinding and magnetic separation process. The grade of TiO2 in the obtained high-grade titanium slag reached 60.68% and the total recovery of TiO2 was 91.25%, which could be directly applied for producing titanium white by the sulfuric acid process. This technique provides an alternative method to use vanadium titanomagnetite concentrate of the Panzhihua area in China. 相似文献
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利用热化学软件FactSage6.4计算了SiO2-CaO-Al2O3渣系的等温相图,进而通过固定辅料MgO的含量为8%(质量分数,下同)并控制Al2O3含量低于35%,可以得到合理的玻璃渣系液相区温度和矿物学物相组成。采用旋转柱体法和模拟计算相结合的方法研究了温度、二元碱度wCaO/wSiO2和Al2O3含量对SiO2-CaO-Al2O3-MgO熔渣黏度的影响。依据单因素实验结果可知,随温度逐渐升高、Al2O3含量由15%增加至35%以及二元碱度由0.3增加到1.0,熔渣粘度呈减小的变化趋势。通过以铁作为捕集剂的熔炼实验可知,钯的回收率随着废催化剂在物料体系中质量分数的增加而增大,但随着持续增大二元碱度和升高温度,其先增大而后减小。采用选取的Pd/Al2O3废催化剂和实验优化后的玻璃渣组分进行回收实验,即Al2O3和MgO含量分别约为30%和8%、二元碱度为0.5,钯的回收率可达99%,玻璃态尾渣中钯的残留量小于4.50 g/t。 相似文献