超高碱度对烧结矿性能与工艺参数的影响

 进行了超高碱度烧结, 适宜工艺参数,不同SiO2含量,烧结强化措施的实验室试验研究。试验结果表明,在碱度2.0～3.2范围内,随着碱度的上升,ISO转鼓指数上升,利用系数提高,烧结速度加快,成品率下降。在碱度2.0～2.8范围内,指标几乎成直线上升,碱度2.8以后部分指标开始出现下降趋势,碱度2.8是攀钢现有烧结矿的最适宜碱度。随着碱度的提高,烧结矿中钛赤铁矿与钛磁铁矿减少,铁酸盐含量增加,钙钛矿约有增加,硅酸盐变化不大。还原性与低温还原粉化率均得到改善,软化与熔融开始温度上升,软化区间与滴落区间减薄,有利于改善高炉透气性。在超高碱度2.8条件下,应用正交试验对工艺参数寻优,并进行了强化措施试验。在目前生产条件下有必要将碱度从2.4提高至2.8,SiO2质量分数为5.0%合适,根本途径在于钒钛精矿提铁降硅降钛。     

分流制粒烧结工艺参数对钒钛烧结矿微观结构的影响

研究了分流制粒烧结中酸性物料的粒度、配碳量和碱度等工艺参数对烧结矿微观结构的影响。结果表明,酸性物料的粒度范围扩大时,料层透气性变好,铁酸钙增多,矿相结构更均匀。当碱度较低时,烧结矿黏结相以硅酸二钙和玻璃质为主;随着碱度升高,钙钛矿含量先增加后减少,当碱度达到2.02时,铁酸钙含量大量增加,黏结相以铁酸钙和玻璃质为主。随着配碳量的增加,铁酸钙含量降低,钙钛矿含量增加,赤铁矿含量减少,亚铁含量增多,将使得烧结矿的转鼓强度和还原粉化指数提高,还原性下降。综合考虑分流制粒钒钛矿烧结配碳量选择4.2%比较适宜。     

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.     

MgO对烧结工艺及烧结矿冶金性能的影响

研究了MgO对烧结工艺及烧结矿冶金性能的影响.研究结果表明,在烧结过程中不加或少加MgO,可提高烧结生产效率,获得冷态强度高、软熔带温度区间窄的烧结矿,从而提高高炉软熔带的透气性、降低料柱全压差.为保证高炉渣对MgO含量的要求,以及确保烧结矿低的低温还原粉化率,提出了合理添加MgO的新工艺.     

烧结提产的生产实践

宁波钢铁有限公司目前年产铁水400万t,由1台烧结机对应2座高炉生产,烧结矿入炉配比只能满足62%,铁烧产能不匹配。通过采取合理配矿,稳定配矿结构;加强生石灰入仓、燃料、块矿筛下粉粒度管理;加强烧结过程控制,稳定混合料水分,稳定布料等以减少生产波动;增加烧结料层厚度,提高烧结成品率,降低固体燃料消耗及推行自主管理活动;同时加大员工培训力度,提高操作水平等措施,稳步提升烧结产能。     

Influence of Alumina on Iron Ore Sinter Properties and Productivity in the Conventional and Selective Granulation Sintering Process

Iron ore sinter constitutes a major proportion of blast furnace burden. Hence, its quality and consistency have a significant impact on blast furnace performance. Iron ore fines are the main source for sinter, and the chemical composition of the iron ore fines, together with the thermal conditions that blends are subjected to, plays an important role in forming the primary melt during the sintering process and accordingly determines the sinter structure and quality. Therefore, considerable importance has been placed on the chemical composition and consistency of iron ore fines, particularly in terms of alumina content. Due to depletion of high grade iron ore resources, alumina content in the iron ore fines is expected to increase gradually. Ore with higher alumina content is usually expected to be detrimental in forming the sinter matrix, if sintered alone, due to the low reactivity of alumina bearing minerals and the high viscosity of primary melts. The selective granulation process is a new sintering process for high alumina iron ore fines, and can eliminate the adverse effects of ‘hard to sinter’ or ‘unsuitable – for ironmaking’ ores. In the present work laboratory sintering experiments have been carried out with iron ore fines of different alumina level (2.00 to 5.46 mass‐%) to know the influence of alumina on mineralogy, productivity, physical and metallurgical properties of sinter prepared by the conventional and the selective granulation process. With increasing alumina content in sinter of both the conventional and selective granulation process, the fractions of hematite and of silico‐ferrites of calcium and alumina (SFCA) as well as the pore phase increased whereas the magnetite and silicate phases decreased. With increase in alumina content sinter productivity and tumbler index (T.I.) decreased, and metallurgical properties like sinter RDI and reducibility improved. However, sinter of the selective granulation process showed better results compared to the conventional process.     

烧结过程气流分布对烧结矿质量影响的研究

采用烧结杯实验和现场测试相结合的方法,研究了烧结过程中气流分布对烧结矿质量的影响.通过现场测试得知,双烟道两侧各风箱支管的气流分布存在波动,烧结机上表层烧结矿表观不均匀,矿相上也存在一定差异.烧结杯试验结果表明,在现场原燃料条件下,烧结工艺参数最佳控制范围是点火负压为10～11 kPa、烧结负压11 ～ 12 kPa、点火温度1 030℃左右.按上述参数调整生产工艺,可达到提高烧结矿质量的目的.     

MgO对钒钛烧结矿产质量的影响

针对攀钢烧结生产的情况,在实验室进行了MgO对钒钛烧结矿产、质量影响的试验研究.结果表明,适当增加攀钢钒钛烧结矿MgO含量,有利于提高烧结矿转鼓强度、成品率,改善其冶金性能.从目前攀钢条件看,烧结加少量(2%～3.5%)白云石或高镁石灰是行之有效的措施,烧结矿MgO＜3.7%为宜.     

烧结固体燃料粒度对烧结矿产质量试验研究影响

为探讨济钢目前烧结原料结构条件下固体燃料粒度对烧结矿产质量的影响,通过改变固体燃料粒度中〈1mm的比例进行烧结杯试验。结果表明,随着固体燃料粒度中〈1mm比例的降低,垂直烧结速度加快,烧结矿成品率、利用系数、转鼓强度、平均粒径等指标明显改善,对降低固体燃料、烧结内返粉和高炉槽下返粉将起到重要作用。生产中应稳定四辊操作,适当放宽输出粒度范围,杜绝固体燃料的过粉碎现象。     

Influence of the Composition and Height of the Bed on the Quality of Sinter,Fuel Consumption,and Capacity of the NLMK Sinter Machines

Metallurgist - A preliminary technological analysis of the operation of the NLMK sinter plant, dual and multiple regression methods, and 2015–2018 monthly technical reports were used to study...     

碱度对鞍钢烧结矿产、质量的影响

由于鞍钢球团矿产能增大,球团矿的入炉比例将增加,这就要求提高烧结矿的碱度以满足高炉生产的要求。为了考察继续提高碱度对烧结矿产质量的影响,进行了将烧结矿的碱度从2.0逐步增加到2.8的试验研究。结果表明在此碱度范围内,随着烧结矿碱度的提高,利用系数呈逐渐提高趋势,转鼓强度有明显的提高趋势,烧结矿中铁酸钙含量逐渐增加,烧结矿的冶金性能改善,这些都更加有利于高炉冶炼。     

碱度对石钢烧结矿质量的影响

在石钢目前的原料条件下，探索不同烧结矿配比的适宜碱度值。碱度拟定为1.8、2.1、2.4等3个梯度水平，在碱度变化过程中其它参数保持不变。实验结果表明，随碱度的增加，烧结矿软熔性能、烧结矿粒度及烧结矿低温还原粉化指标明显改善。当碱度在2.1时烧结矿综合指标最佳。     

白云石和蛇纹石对烧结矿质量及显微结构的影响

白云石和蛇纹石对烧结矿质量及显微结构影响的研究结果表明:配加白云石提高烧结矿的MgO含量,烧结矿转鼓强度降低,而配加蛇纹石提高烧结矿的MgO含量时,转鼓强度提高.配加白云石后,烧结矿矿物组成主要为铁酸钙与骸晶状赤铁矿,骸晶状赤铁矿周围有大量以玻璃质物相存在的硅酸盐矿物,且有大量微细裂纹;烧结矿孔隙率大,气孔为大孔薄壁结构,所以烧结矿强度低.配加蛇纹石后,烧结矿矿物组成主要为磁铁矿和铁酸钙,钙铁橄榄石矿物增多变大,气孔为中孔厚壁结构,所以烧结矿的质量得以改善.     

MgO含量对低钛烧结矿质量的影响

以宣钢原料为对象,依据烧结生产情况研究了不同Mg O含量对烧结矿质量的影响。结果表明随着Mg O含量的增加,烧结矿各项指标均受不同程度的影响,适宜的Mg O含量有利于提高烧结矿的成品率、转鼓强度,改善其冶金性能。综合考虑其与烧结过程参数、烧结矿的粒度组成、成品率和转鼓指数及冶金性能的关系,确定宣钢烧结矿适宜Mg O含量为2.50%~3.00%。     

不同印度铁矿粉配比烧结矿的显微结构对烧结性能的影响

 在唐山不锈钢烧结厂原料条件下配加不同比例的印度铁矿粉进行烧结试验。结果表明,随烧结原料中印度铁矿粉配比的增加,烧结矿显微结构由交织熔蚀结构向斑状 粒状结构再向交织熔蚀结构和骸晶结构过渡,其中交织熔蚀结构的冷强度较高,斑状 粒状结构的冷强度较低,骸晶结构则恶化低温还原粉化性能。     

Investigation of the Mix Sintering Process in a Dense and Mechanically Loosened Layer on Sinter Machines of Sinter Factory No. 5 of Magnitogorsk Iron & Steel Works PJSC

Metallurgist - This article presents the results of studies comparing the mix sintering process in a bed loosened with vertical rippers and a dense bed of a mix. In this study, for the first time,...     

固体燃料种类和配比对烧结矿质量的影响

为了合理利用燃料资源和降低生产成本,以混匀矿为主要含铁原料,系统研究了焦粉和2种煤粉对烧结矿化学成分、矿物结构和矿物组成以及烧结矿冶金性能的影响。结果表明,在等热值条件下,焦粉有利于改善烧结矿的中温还原性能,但会恶化其低温还原粉化性能;而2种煤粉做固体燃料可以增加烧结矿总的交织-熔蚀结构,对改善烧结矿的冷态强度和低温还原粉化性能比较有利。     

Effect of Size Parameters of Mix Ingredients on the Porosity and Reduction Characteristics of Sinter

The paper aims to describe the effect of size parameters of the mix ingredients on the tumbler index, porosity and reduction properties of sinter. These parameters are important factors for the furnace performance when the sinter is fed as burden material Understandably, the fines generated inside the furnace in the stack zone or during reduction affect the permeability of the stack zone, which results in a decrease in driving rate and CO utilisation. Pot sintering studies were carried out using hematite ore mix from typical mines in India. The sinter basicity (CaO/SiO₂) and MgO content in the sinter were kept at 2.1 and 1.5% respectively. The effect of the size parameters of the mix ingredients, namely size of coke, size of ore fines and that of limestone, on the porosity and quality parameters of sinter was investigated. The studies have shown that reducibility of sinter was well correlated with the proportion of micro‐pores out of total pores available in the sinter. Micro‐porosity of the sinter samples and their reducibility increased with decrease in the size range of coke breeze. Sintering of ore fines with reduced size, also, increased the sinter micro‐porosity. Besides, the average pore radius and density of the sinter sample and consequently the sinter reducibility increased with decreasing ore size. When the size of flux was narrowed down to –3+0.5 mm from –3 mm, the reduction degradation index value declined from 26.8% to 25.6% with marginal decrease in sinter reducibility. Moreover, the speed of sintering increased as well.     

焦粉粒度对济钢烧结矿质量的影响

生产表明,在济钢二烧高碱度(R＝2.4)烧结矿生产的条件下,烧结矿RDI性能与其FeO含量有一定的相关关系.为了保证烧结矿中的FeO含量,又不致增加焦粉消耗,进行了焦粉粒度、混合料水分、风门开度等因素的相关试验.根据试验结果我们对焦粉粒度进行了优化, 并取得了良好的效果.