采用离心式转动制粒机进行焦粉制粒的技术及对烧结操作的影响

通过烧结杯试验和名古屋２号烧结机工业试验，对采用离心转动的弗洛德数（Ｆｒ）为普通园筒制粒机的１０＾２倍的制粒机进行制粒技术，以及制粒焦粉对烧结操作，混合料制粒的烧结质量的影响进行了定量研究。     

细粒MINAS RIO赤铁精矿烧结行为及其强化研究

针对MINAS RIO赤铁精矿粒度细、制粒性能差,在烧结料中配比不能太高的问题,开展了分流造球预成型强化制粒烧结工艺研究。结果表明,该工艺能显著改善混合料的透气性,降低焦粉配比,提高烧结料层氧位,生成更多的铁酸钙粘结相,形成大小适中的圆孔,从而改善烧结矿强度和还原性。     

圆筒造球机在莱钢烧结系统中的应用

为提高烧结矿的强度和产量 ,莱钢烧结厂强化制粒工程 ,新增圆筒造球机等设备 ,并采用外滚焦粉工艺 ,从而改善了烧结料粒度 ,提高了烧结矿料层的透气性 ,增加了烧结机台车上辅料厚度 ,产量提高 1.5 % ,直接经济效益 761.73万元 /a。     

焦粉粒度对铁矿石烧结过程的影响

铁矿石烧结中焦粉的燃烧过程取决于焦粉的粒度.通过烧结试验,研究了焦粉粒度对烧结性能和质量的影响(针对含10%MAC粉的配矿).通过降低细焦粉粒级(相似文献   

分流预成型强化制粒改善镜铁矿粉烧结性能

针对镜铁矿精粉成球性及可烧性差的特点,采用分流预成型强化制粒工艺对进口镜铁矿精粉制粒及烧结性能开展研究.与常规制粒工艺烧结指标相比,采用分流造球强化制粒烧结工艺,焦粉配比从4.85%降至4.20%,利用系数从1.44 t·m-2·h-1提高至1.71 t·m-2·h-1,转鼓强度从57.60%提高至63.80%,固体燃耗从76.46 kg·t-1降至65.24 kg·t-1;采用分流辊压预成型强化制粒烧结工艺,焦粉配加量从4.85%降至4.70%,利用系数从1.44 t·m-2·h-1提高至1.64 t·m-2·h-1,转鼓强度及固体燃耗基本不变.因此,分流预成型强化制粒工艺较常规制粒工艺能显著改善镜铁矿烧结性能.其作用机理为:镜铁精矿经分流预成型后能改善混合料的透气性,降低焦粉配比,提高烧结料层氧位,生成更多的铁酸钙及赤铁矿,所得成品烧结矿结晶完善,矿物之间胶结紧密,内部气孔由不规则大孔变为总体分布较为均匀且大小适中的规则球形,改善了烧结矿的强度和还原性.      

八钢烧结使用磁化水

八钢烧结使用磁化水新疆八一钢铁公司选烧厂绕结车间在一混进水管安装ＣＳＭ－Ｗ型磁水器，使混合机加入磁化水，使用效果良好。使用磁化水后，造球效果明显提高，烧结料透气性改善，烧结机产量和利用系数均有较大提高。使用磁化水前后的造球效果如下表：刘兴民八钢烧结使...     

改善烧结混合料制粒效果的工业试验

在实验室研究基础上，对攀钢烧结厂的圆筒混合机工艺参数进行优化，并将原加水方法（水管喷水）改为雾化喷水，从而使烧结混合料制粒效果得以改善，烧结指标大幅度提高。     

长钢小球烧结工程技术改造及效果

为了满足高炉生产要求，长钢烧结厂进行了小球烧结工程技术改造。将原一次、二次混合机改造为强力圆筒混合造球机，改善了制粒效果，增加了烧结混合料层的透气性；增设自动配料系统，使铁品位稳定率提高8．6个百分点，碱度稳定率提高0.86个百分点；改造后实行低碳厚料层烧结工艺，年增产15．43万t，节约固体燃料1.317万t，增加经济效益约475．12万元。     

强化攀钢烧结混合料制粒的试验研究

为解决攀钢现场烧结混合料制粒效果差的问题，在实验室通过优化制粒圆筒混合机的工艺参数。使制粒效果大幅度提高。烧结指标得到改善。     

福山钢铁厂烧成球团矿烧结法的工业生产

日本钢管公司福山钢铁厂通过改造现有5号烧结机,已开始生产烧成球团矿烧结块(HPS),年生产能力为6Mt。烧成球团矿烧结工艺的基本原理是大量使用细铁矿粉之类的球团原料,该工艺具有以下三个特点:1)用10台圆盘造球机强化造球作业,生产高质量的生球。2)生球外裹焦粉提高焦粉燃烧效率。3)用2台宽带输送机进行小心布料,防止生球破碎,烧成球团矿烧结法由于采用的原料便宜,还原性高,SiO_2含量低而有利于成本的降低。     

Influence of Coating Granulation Process on Iron Ore Sinter Quality and Productivity

For better blast furnace performance, there has always been a need for better quality raw materials like sinter, lump ore, and pellets. Among these raw materials the usage of sinter in blast furnace is at higher side compared to other iron bearing materials. As the quality of sinter product improves, its usage in blast furnaces also increases. Iron ore fines are the main source for sinter making. To improve the sinter properties it is necessary to provide good quality of iron ore fines. Due to depletion of high grade iron ore resources, goethite and limonitic ore content in iron ore fines is expected to increase gradually. Usually limonitic and goethite ore are associated with higher alumina and LOI. The conventional sintering process is one of the well established processes for high quality hematite ore. It does not fully respond to the low grade iron ore associated with goethite and limonite. This has led to deterioration in sinter properties and productivity. In recent years the improvement in the quasi‐particle structure with the granulation process is an effective method for improving sinter quality and productivity. To improve the sinter quality and productivity for low grade iron ore fines, different granulation processes like the conventional one, and other two advanced granulation processes like coke breeze, and flux & coke breeze coating granulation were studied in detail by conducting laboratory pot grate sintering experiments. From the test results it was found that sinter productivity, physical and metallurgical properties of the sinter improved with flux & coke breeze coating granulation process compared to conventional and coke breeze coating granulation process. Proper selection of the granulation time is very important to achieve the desired sinter properties. In the present work detailed laboratory experiments have been carried out by varying the coating time from 30s to 110s to study the influence of flux & coke breeze coating granulation time on mineralogy, productivity, physical, and metallurgical properties of sinter. With a coating granulation time of 50s, higher productivity, higher yield, and stronger sinter (higher T.I) with lower RDI and ‐5mm size sinter were achieved.     

焦粉粒度分布对铁矿石烧结指标的影响

焦粉粒度对烧结生产指标具有重要的影响。通过烧结杯试验开展焦粉粒度最佳组成的试验研究。结果表明，焦粉粒度从小于1 mm增加到5~8 mm时，烧结矿强度、烧结利用系数、固体燃耗、产量、垂直烧结速度及粒度分布均变差；烧结生产所使用的焦粉粒度组成可根据生产目标进行调整，当要求烧结矿转鼓强度达到最高值时，焦粉的粒度分布应当是57.20%的小于1 mm、25.63%的1~3 mm、11.17%的3~5 mm和6.00%的5~8 mm。当焦粉由鞍钢实际生产的粒度分布调整为最佳粒度分布时，烧结原料矿化过程合理，烧结矿转鼓强度增加1.48%，产量增加1.73%，10~40 mm的烧结矿增加2.16%，固体燃耗降低0.69 kg/t，冶金性能指标明显改善。研究结果对烧结生产中合理控制焦粉粒度分布具有一定的理论指导作用。     

改善烧结焦粉粒度的研究

测定和评价了烧结粉焦系统，摸索了宝钢烧结焦粉的合适粒度，分析了ＣＤＱ粉加入对烧结产量、质量的影响，提出了改善焦粉粒度的建议。     

添加催化助燃剂降低烧结焦耗的工业试验

为了降低固体燃料消耗和强化烧结，在考虑烧结用焦粉和烧结工艺特点的基础上，制备出适用于焦粉燃烧的催化助燃剂，并在河西堡铁厂进行了添加助燃剂的工业试验。结果表明，在该厂原料和技术条件下，往焦粉中添加0．137％(按焦粉的质量百分数，下同)左右的催化助燃剂，可节焦8．06％，烧结机利用系数增加3．63％，成品率提高3．44个百分点，烧结矿的质量略有改善。     

高炉渣干式离心粒化实验研究

针对水冷高炉渣耗水量大、能量未回收、污染重等问题,进行了高炉渣干式离心粒化实验研究。结果表明:(1)高炉渣的玻璃体含量均在95%以上,可以作为水泥原料使用;(2)渣温度高、流量小、粒化盘直径大,粒化后渣粒越小,粒化理想时,88%渣粒径<4.75mm;(3)粒化盘的表面特性影响其粒化效果。其表面光洁度越高,渣粒的粒径越小且均匀,粒化后的渣粒越接近于球形;粗糙的粒化盘易拉出玻璃丝。     

基于固体燃料粒度优化的烧结过程NOx减排

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。     

烧结细粒燃料分加技术研究

太钢新450 m2烧结机在传统的燃料分加工艺基础上整合燃料分级工艺,通过内配1~3 mm粒级焦粉,外配-1 mm细粒焦粉,实现了燃料分级分加。工业试验表明,该工艺能更好地发挥燃料外配优势,在进一步降低固体燃耗和烧返比等方面效果显著。     

自熔性铸造型焦的研制

介绍了研制自熔性铸造型焦所采用的原料及制备工艺。用自熔性铸造型焦在3～5t/h工业冲天炉上进行的熔炼试验结果表明:这种型焦具有较明显的抑制铁水增硫的效果;对铁水的球化,提高球墨铸铁的内在性能十分有利;同时可减少炉壁的侵蚀,节约修炉材料,并可省去往炉内加石灰石这一操作过程和设备。     

南(京)钢降低烧结矿FeO的攻关实践

介绍了我厂降低烧结矿FeO攻关实践所取得的效果，从提高焦粉破碎粒度合格率，降低焦粉配比。采用焦粉二次添加与低温厚料层烧结工艺生产高碱度烧结矿等方面论述了降低烧结矿FeO的措施，并指出了今后的努力方向。     

Influence of coke breeze particle size on quality of sinter

Abstract

Iron ore sintering is an extremely complex process involving fuel combustion to generate heat and reducing gases like CO. This heat allows physicochemical, solid and solid–liquid reactions to form liquids of complex components as fuel particles are consumed and cooling processes allow the formation of solid mineral phases. At JSW coke breeze from coke ovens is used as solid fuel in sinter. The properties (size) of the solid fuel play a very important role in determining the sinter microstructural properties and sinter quality. The microstructure of the sinter is a basic necessity and also the first step towards establishing the structural property relationship. Microstructural studies have been carried out to understand the effect of coke breeze particle size on sinter microstructure and sinter properties. The present paper is an attempt to understand and correlate the physical and metallurgical properties of sinter with varying size of the coke breeze particle in sinter mix. It was observed that as the proportion of coke breeze below 3 mm in the sinter mix increased from 53·0 to 90·0% the calcium ferrite phase increased, the number of bigger size pores decreased, and thereby decreased the reduction degradation index (?3·15 mm) of sinter from 39·7 to 23·5%. Superior sinter properties were obtained with the ?3 mm coke breeze size ～90% in the sinter mix.