提高钒钛烧结矿强度的生产实践

分析了影响钒钛烧结矿强度的主要因素；同时对提高钒钛烧结矿强度所采取的措施作了总结。     

提高钒钛烧结矿强度的探讨

针对承钢钒钛铁精矿的特点，分析了该厂煤结矿强度差的原因，并在此基础上就配加普通精矿、调整烧吉矿碱度及ＦｅＯ含量等措施来提高烧吉矿强度进行了生产试验，找到了提高承钢钒钛烧结矿强度的途径。     

钒钛烧结矿喷洒卤化物溶液工业性试验总结

介绍了攀钢烧结矿表面喷洒卤化物稀溶液后，使其低温还原粉化率（ＲＤＬ－３．１５）由４５％～６５％下降到１０％以下，并在高炉冶炼时获得增产２．１％及降焦１ｋｇ／ｔＦｅ的工业试验情况。试验中，还研究了合适的卤化物稀溶液浓度、数量及其对烧结矿理化性能的影响，探讨了喷洒卤化物稀溶液对高炉炉顶设备、煤气管网及车间作业环境的影响。     

烧结矿配加钒钛铁精矿生产实践初析

分析宝钢烧结矿配加钒钛铁精矿后对烧结生产指标的影响,提出强化烧结过程和改善烧结矿质量的措施。     

碱度对钒钛烧结矿显微结构的影响

采用光学显微镜研究了碱度对钒钛烧结矿显微结构的影响.研究表明:碱度由2.1提高到2.5,烧结矿中钛磁铁矿、铁酸钙与硅酸二钙含量增加,钛赤铁矿与玻璃质含量降低;骸晶状赤铁矿与包边结构减少,显微结构由斑状向交织熔蚀结构过渡;相应的烧结矿强度增加.碱度为2.5时,铁酸钙主要以柱状、针状形态存在,钛磁铁矿主要以他形粒状形态存在,钙钛矿主要呈十字形和他形晶形态存在.     

提高钒钛磁铁精矿为主烧结矿强度的集成技术应用

攀枝花钒钛磁铁精矿具有低铁、低硅、高钛、高铝、高亚铁、高硫等特点,以此为主要烧结原料的烧结矿,易生成高熔点的矿物结构,使得烧结矿的强度低,一般在66%左右。采取优化、强化制粒、实施低硅高碱度与厚料层烧结、进行设备改进、强化漏风治理等集成技术的应用,以钒钛磁铁精矿为主烧结的烧结矿强度达到71%以上。     

钒钛烧结矿配加北非粉的研究与实践

介绍了承钢配加北非粉,提高钒钛烧结矿Si O2含量的研究与实践过程。以实验室烧结杯试验为基础,结合生产实践,在配加10%北非粉时烧结矿Si O2含量提高到5.0%以上,促进了烧结过程物料粘结,降低了钒钛烧结矿返矿率,提高了钒钛烧结矿强度。     

提高钒钛磁铁精矿烧结矿强度的集成技术应用

攀枝花钒钛磁铁精矿具有低铁、低硅、高钛、高铝、高亚铁、高硫等特点,以此为主要烧结原料的烧结矿,易形成高熔点的矿物结构,烧结矿强度低,一般在66%左右。通过应用提高烧结矿强度的集成技术,包括:强化制粒、实施低硅高碱度与厚料层烧结、进行设备改进、强化漏风治理等,使烧结矿强度达到71%以上。     

钒钛铁精矿配比对钒钛烧结矿冶金性能的影响

就提高钒钛铁精矿配比对攀钢钒钛烧结矿冶金性能的影响进行了研究。结果表明:钒钛铁精矿配比从46%提高到52%,钒钛烧结矿的FeO含量升高,低温还原粉化率降低,中温还原度降低,软化开始、压差陡升和滴落温度均升高,最大压差升高。本结果可为钒钛铁精矿烧结合理配矿提供指导。     

料层厚度对钒钛烧结矿性质的影响探析

通过对攀钢烧结生产数据进行统计分析,找出了料层厚度与钒钛烧结矿的强度、FeO量和烧结生产的负压、点火煤气消耗、固体燃耗、成品率等的关系.     

Influence of MgO addition on mineralogy of iron ore sinter

The influence of MgO addition on sinter mineralogy was studied on sinters produced in a laboratory installation, with a wide range of MgO/CaO ratios at several basicity indices [B = (CaO + MgO)/ (SiO₂ + A1₂O₃)] between 0.7 to 1.9. The most striking influence of MgO is the suppression of hematite and Ca-ferrite phases and the increase in magnetite phase. In general, MgO favors the formation of glass and suppresses the precipitation of dicalcium silicates in favor of Ca-Fe-Mg olivines and pyroxenes. Microprobe studies revealed that most of the Mg was picked up by the magnetite phase to form mixed spinels of type (Fe, Mg)O · Fe₂O₃. At a constant basicity index, increased replacement of CaO by MgO also led to increased participation of FeO in the slag formation process, thus increasing the overall FeO content of sinter. A mechanism for the formation of mixed spinels has been proposed. The effect on various sinter properties resulting due to change in sinter mineralogy has been outlined. S. C. PANIGRAHY, with Department of Metallurgy and Metallography, State University of Ghent, Ghent, Belgium at the time the experiments were carried out     

Influence of magnesia on iron ore sinter properties and productivity

Abstract

Dolomite and other MgO bearing materials are being increasingly used as basic flux constituents for production of fluxed sinters. Addition of flux materials in sinter influences the resultant sinter microstructure and chemical properties. The physical and metallurgical properties of sinter mainly depend on mineralogy of the sinter. Dolomite is the source of double carbonate of calcium and magnesium. Recent studies reveal that, apart from the additional fuel needed, the addition of dolomite and MgO bearing material greatly influences the magnetite content and the properties of the sinter produced. The increasing use of MgO bearing fluxes in the blast furnace burden, and the trend to incorporate a major part of fluxes in the sinter mix led to an investigation of the influence of MgO on sinter properties and productivity. In this study, the systematic investigation has been made on the influence of MgO% (1·4 to 2·6) on sinter mineralogy and sinter properties with dolomite. Microstructural examination of dolomite sinter revealed that hematite and calcium ferrite phases decreased whereas magnetite phase increased with increase in MgO percentage in sinter. From the laboratory pot grate sintering results it was found that sinter reduction degradation index improved whereas tumbler index and reducibility decreased with increase in MgO%.     

Influence of limestone particle size on iron ore sinter properties and productivity

Iron ore fluxed sinter is the main ferrous burden of Jindal south west steel limited (JSWSL) blast furnaces. In sinter plant fluxes including limestone and dolomite are added to improve the sinter properties of iron ore and to provide an appropriate slag composition of the blast furnace. The raw material grain size affects the sinter process considerably because the sinter productivity and quality are strongly dependent on the green permeability of the bed, which is determined by the particle size distribution of the raw materials, the granulation effectiveness and by the sintering process itself. It is well‐known that in fluxed sinter, the size of limestone affects productivity and physical and metallurgical properties of the sinter. It is therefore necessary to understand the role of limestone particle size on sinter properties and productivity. In the present work laboratory sintering experiments have been carried out with different levels of limestone mean particle size (from 0.14 to 1.83mm) to understand the influence of limestone particle size on mineralogy, productivity, physical and metallurgical properties of the sinter. Sinter productivity increased with increasing limestone mean particle size due to improved sinter bed permeability. Sinter with limestone mean particle size of 1.25 to 1.52 mm yielded better sinter strength and lower RDI compared to sinter with smaller or larger limestone mean particle size. Higher sinter strength is due to better and uniform distribution of limestone particles, and better bed permeability enabled easy assimilation and effective distribution of calcium ferrite phases. The improvement in sinter RDI is due to change in mineralogy of the sinter compared to coarser and finer limestone mean particle size.     

烧结矿MgO含量对含钒钛炉料熔滴性能影响

利用高温熔滴炉模拟实际高炉软熔带的运行情况.探讨在承钢炉现有炉料结构条件下,炉料中不同Mg O含量对含钒钛高炉炉料软化温度、熔化温度、最大压差、熔滴综合指标等高温物理性能的影响.结果表明：Mg O质量分数由1.92％增加到2.40％后,炉料的软化温度无明显变化;炉料的滴落温度td 升高,熔化温度区间Δtds增大;炉料的最大压差ΔPmax升高,炉料透气性变差;炉料熔滴的总特性值S增大,熔滴性能变差.     

印度矿粉对烧结矿矿相结构的影响

采用光学显微镜对印度矿粉及其烧结矿进行观察,研究了其对烧结矿矿相结构的影响.研究发现:印度矿粉结构致密,主要为磁赤铁矿,以板状形态存在;印度矿粉配加量由10%增加到40%,烧结矿矿物组成变化不明显,显微结构由斑状-粒状结构向斑状结构过渡,相应的烧结矿强度降低;印度矿粉由40%增加到60%,磁铁矿含量降低,铁酸钙含量增加,显微结构由班状结构向交织熔蚀结构过渡,对应的转鼓强度升高.     

Influence of charcoal replacing coke on microstructure and reduction properties of iron ore sinter

This study was carried out to determine the influence of using charcoal as a supplementary fuel on the microstructure and reduction properties of sinter. The primary fuel was coke breeze with 0, 20, 30 and 40% replacement of weight input with charcoal to produce sinter. Experimental results indicate that when the replacement percentage of charcoal to coke breeze increased from 0 to 40%, the porosity and FeO content of sinter also rose. These changes result in an enhancement from 79.8 to 84.3% for the reducibility index due to the increased reducing surface area. In addition, the reduction degradation of sinter also improves since degradation during crystalline transformation is restricted. Therefore, replacing coke breeze with charcoal is able to improve the reducing properties of sinter, which is beneficial to small and large blast furnace operation.     

配加贾家堡铁矿对烧结矿性能的影响

为降低烧结矿成本,对烧结原料中配加一定比例的贾家堡铁矿进行了研究。烧结杯试验结果表明,随着烧结铁料中贾家堡铁矿配比增加,烧结矿成品率呈现逐渐降低趋势,转鼓指数也逐渐降低。贾家堡铁矿配比由0增加到4.48%时,烧结矿低温还原粉化率由76.7%降低到71.9%,而当贾家堡铁矿配比继续增加时,低温还原粉化率却有所上升。     

澳矿粉配比对含钒烧结过程和烧结矿冶金性能的影响

基于承钢烧结现场条件,研究了澳矿粉配比对含钒烧结过程和烧结矿冶金性能的影响.结果表明:在试验条件下,适当增加原料中澳矿粉的配比,烧结矿中的w(FeO)和w(TiO2)降低,而w(SiO2)和w(Al2O3)则升高,赤铁矿和玻璃质含量增加,烧结料层的透气性得到了改善.当澳矿粉配比在33%以内增加时,烧结成品率、烧结矿冷态转鼓指数和低温还原粉化性能以及烧结矿的产量都有所改善.综合考虑澳矿粉配比对烧结矿产量、质量及高炉冶炼过程的影响,应将澳矿粉在烧结原料中的配比提高到33%左右.     

优化配矿结构对烧结矿冶金性能的影响

针对永锋钢铁公司烧结原料结构, 明确烧结目标, 进行烧结杯优化配矿实验, 以达到提高烧结矿成矿率、利用系数、成品矿品位、转鼓强度以及降低其返矿率的目的.实验运用扫描电镜观察成品矿形貌显微结构; 用成品烧结矿还原实验的检测数据, 探究优化配矿对成品烧结矿还原性能的影响; 并对比现场烧结配矿前、后的各项指标.实验结果表明:在现场烧结配矿条件下(在将巴混配比提高6 %, 燃料比降低至4 %, 烧结负压为11 kPa)通过优化配矿, 成品烧结矿转鼓强度可达到70.93 %, 成品率及利用系数分别为84.44 %、1.77 (t/m2h), 烧结矿品位为53.7 %, 还原度高达83.5 %, 可以保证高炉稳定生产.      

w(MgO)对含钒、钛烧结矿强度和烧结过程的影响

研究了w(MgO)对承钢含钒、钛烧结矿的矿物组成、矿物结构、烧结矿强度和烧结过程的影响,发现提高烧结矿中的w(MgO)对于提高承钢高碱度烧结矿的产量和改善烧结矿的质量都是十分不利的.考虑到高炉冶炼的需要,承钢烧结矿中的w(MgO)应控制在2.0 %左右.