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韶钢高炉使用喷洒CaCl2 溶液的烧结矿的工业试验结果表明 ,烧结矿喷洒CaCl2 溶液后对降低高炉上部炉料的低温还原粉化 ,改善料柱透气性 ,促进炉况顺行起到了较大作用 .喷洒CaCl2 溶液浓度 3%、液量 1%时效果较好 ,高炉可增产 3.2 %降低焦比 1.5% . 相似文献
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叙述了烧结矿喷洒CaCl2溶液工业试验,结果表明,烧结矿喷洒CaCl2溶液后对降低高炉上部炉料的低温还原粉化、保持高炉块状带的透气性、促进炉况顺行有较大作用,喷洒CaCl2溶液的浓度为3%时效果较好,高炉可增产6%,同时为降低焦比、提高喷煤比创造了条件。 相似文献
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随着太钢450 m2烧结机投产,配矿结构中进口矿粉比例大增,烧结矿低温还原粉化率升高.为了保高炉精料,进行了烧结矿喷洒CaCl2溶液的试验研究并加以实施,烧结矿低温还原粉化率平均降低4 %~6 %,取得了比较明显的效果. 相似文献
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为了较全面地了解烧结矿喷洒CaCl2溶液后对高炉冶炼的影响, 在实验室完成了多项冶金性能对比实验, 实验数据表明:喷洒CaCl2溶液后烧结矿的低温还原粉化性能明显改善, 但中温还原性和中温还原粉化指数则变化很小,而荷重熔滴性能略有变差, 由此推断喷洒CaCl2 溶液可有效改善高炉上部的透气性, 对高炉中部的透气性影响不... 相似文献
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在采用烧结矿表面喷洒CaCl2溶液进行生产时,改善了烧结矿的低温还原粉化性能,却加快了除尘系统洗涤塔内衬钢板的腐蚀速度。研究采用含硼添加剂替代部分CaCl2外喷烧结矿,能有效地抑制烧结矿的低温还原粉化,很好地改善了衬板腐蚀状况,并对烧结矿的软化温度和还原性等重要冶金性能的影响,进行了测试分析。 相似文献
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介绍了梅山烧结矿喷洒氯化钙溶液的工业试验情况。试验结果表明:烧结矿喷洒CaCl2对改善其低温还原粉化指标有明显效果,增铁节焦效益显著。 相似文献
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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. 相似文献
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在烧结混合料中加入营口冶金助剂公司生产的烧结粘结剂进行了工业试验。试验结果表明:在添加量为0.125kg/t时,湿、干料成球率分别提高3.6%和4.4%,料层透气性提高4.2%~4.4%,垂直烧结速度由23.3mm/min提高到24.5mm/min。 相似文献
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MgO对高碱度高铝烧结矿的影响 总被引:1,自引:0,他引:1
随着钢铁企业高铝铁矿粉使用比例的提高,带来了高炉炉渣黏度增大、渣铁分离困难等一系列问题。采用烧结杯试验,研究了MgO含量增加对高碱度高铝烧结矿经济技术指标、冷强度和冶金性能的影响,采用Nova400 NanoSEM型场发射扫描电子显微镜分析了烧结矿微观结构。试验结果表明,高碱度高铝烧结矿中MgO质量分数从1.72%提高到2.49%时,垂直烧结速度降低4.38 mm/min,利用系数降低0.51 t/(m2·h),低温还原粉化指数增加6.7%;当烧结矿中MgO质量分数为2.11%时,转鼓指数和还原度最高,分别达到61.93%和86.39%;Mg2+主要固溶在磁铁矿晶格中并替代Fe2+,替代的质量分数最高达3.64%,生成的含镁磁铁矿抑制烧结矿降温过程中由Fe3O4→Fe2O3氧化过程的相变,减少了二次赤铁矿的生成,有利于改善烧结矿的低温还原粉化性能。研究结果可以为改善高碱度高铝烧结矿性能和提高炉渣流动性提供理论指导和参考依据。 相似文献
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采用维氏压痕法对钒钛烧结矿与普通烧结矿中常见矿物的显微硬度进行测定,对比分析不同矿物的显微硬度值及压痕裂纹的萌生与扩展。研究发现,两种烧结矿中常见矿物的显微硬度从高到低依次为:钙钛矿-钛赤铁矿-铁酸钙-交织熔蚀结构-钛磁铁矿-硅酸盐;赤铁矿-交织熔蚀结构-铁酸钙-磁铁矿-硅酸盐。总体上钒钛烧结矿的显微硬度高于普通烧结矿,但部分矿物压痕裂纹多,且延伸较长,钙钛矿和钛赤铁矿断裂韧性差、易碎。烧结矿中减少板块状赤铁矿,多发展铁酸钙和交织熔蚀结构有利于提高烧结矿的显微硬度,改善烧结矿的质量。 相似文献
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结合首钢近年来烧结含铁原料结构发生的变化及近年采取的密封技术改造、混合料红外线水分测控系统的投入使用等所打下的设备基础,2006年8月炼铁厂在一烧结作业区4台烧结机上完成了700mm厚料层烧结技术改造,达到了烧结矿产量略有增加、质量提高和燃耗降低的预期目的。 相似文献
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为了研究优化固体燃料粒度以减少烧结过程NOx排放,采用微型烧结燃烧装置进行不同粒度下单独焦粉颗粒的燃烧试验,以及焦粉分别为粗粒级(粒度为2.00~3.15 mm)、中间粒级(粒度为0.5~1.0 mm)、细粒级(粒度小于0.5 mm)下的固结试验,并在此基础上通过烧结杯试验研究了优化焦粉粒度对烧结NOx排放和产质量指标的影响规律。结果表明,随着焦粉粒度的减小,其燃烧过程NOx排放浓度和氮元素转化率均逐渐升高,且当焦粉为全粗粒级和中间粒级时,烧结固结强度得到改善。此外,将焦粉粒度控制在0.50~3.15 mm范围内,其NOx最大排放浓度和氮元素转化率分别降低约8%和27%,且烧结各项产质量指标都得到改善。 相似文献
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《钢铁冶炼》2013,40(6):410-417
AbstractFrom a sinter production point of view, it is important to optimise the sintering process with regard to both sinter quality and production rate. In sintering, airflow rate within the sinter bed decides the production rate and its physical and metallurgical properties. To study the influence of airflow rate (flame front speed) on sinter production and sinter quality, pot grate sintering experiments were conducted at sinter grate suction pressures ranging from 900 to 1700 mm water column over the sinter bed. During sintering, time–temperature data were recorded, and mineralogical studies were carried out. This study reveals that increase in sinter grate suction pressure through the sinter bed from 900 to 1700 mm water column significantly improved the sinter productivity from 34·37 to 48·90 t/m2/day; however, the physical and metallurgical properties of the sinter at higher suction pressure were not optimum with respect to blast furnace requirements. The maximum sinter productivity with desired physical and metallurgical properties was obtained at suction pressure 1300 mm water column. At this pressure, improvement in sinter quality was due to optimum firing temperature and enough retention time available for formation of mineral phases. At an airflow rate 1300 mm water column, sinter productivity was 41·0 t/m2/day, sinter strength (TI) was 73·10%, reduction degradation index was 25·0 and reducibility was 71·50%. 相似文献