加强烧结生产过程控制,降低烧结内返矿率

分析原燃料质量及生产过程控制对烧结内返矿率的影响因素,对存在的问题找出解决问题的措施,从而达到降低烧结内返矿率,降低烧结消耗的目的。     

400 m2烧结机热返矿秤计量改造

邯钢烧结厂400 m2烧结配料车间用2台电子皮带热返矿计算秤代替原冲击流量式热返矿计量秤后,解决了热返矿的计量不准确问题.系统投运后运行稳定可靠、计量精度高,在提高烧结矿质量、降低返矿率、减少燃料消耗等方面效果显著.     

降低武钢烧结返矿率的生产实践

武钢烧结矿返矿率一直较高,造成烧结能耗和加工成本的增加。为降低烧结返矿率,采取了适当提高烧结矿FeO含量、调整烧结点火温度、强化制粒、调整烧结筛网尺寸等一系列措施。2014年第1季度,炼铁厂全厂烧结返矿率降至11.5%,较2011年全年平均值下降5.9%,有效提高了烧结产量,在控制炼铁成本上取得了实效。     

烧结返矿率高的原因分析

烧结返矿率的波动会给烧结过程带来不利影响,返矿率过高会增加烧结成本。通过分析发现烧结料质量、组分及其化学成分是影响烧结厂返矿率的主要原因。     

钒钛磁铁精矿烧结返矿率的调查与降低措施

对攀钢烧结厂烧结返矿率进行了调查，并运用冶金物理化学的物理进行了分析研究，提出了提高烧结成品率、降低返矿率的措施。     

降低烧结返矿率攻关实践

安钢集团水冶钢铁公司380m^3高炉的建成投产，烧结机扩容改造的完成，对提高烧结矿成品率，降低烧结返矿率提出了新的要求。为此，在烧结车间进行了为期两个月的技术攻关，使烧结矿返矿率由19％以上降低至16％以下。     

钒钛磁铁矿烧结降低返矿率技术研究与实践

针对钒钛磁铁精矿烧结强度差、返矿率高而影响产量、增加烧结加工费的实际问题,采取优化配料与工艺参数控制,改进工艺设备,实施环冷机雾化水冷却、松料器通压缩空气新技术,提高了烧结矿强度;同时,优化成品系统运行,对成品矿运输与筛分系统进行技术改造,降低烧结矿转运落差,减轻冲击、摔打、粉化;缩小高炉槽下筛子筛孔间隙,取消部分球团过筛,高炉回收使用返矿中大于5mm粒级的小烧结矿,改进回收系统等。采取这些措施减少了返矿量,降低返矿率2.03%,增加烧结矿产量24.67万t。     

重钢降低高炉槽下返矿率的生产实践

重钢高炉槽下返矿率在同行业内处于较差水平，针对该现状，通过分析影响烧结返矿率因素，从提高烧结矿质量、加强高炉筛分系统的管理、完善和加强核算和考核制度等方面着手，使烧结返矿率从16．91％下降到13．58％，取得了明显的进步。     

烧结返矿粒度分布对烧结矿质量影响研究

返矿粒度分布是烧结返矿制度的重要组成部分。合理稳定的烧结返矿粒度,是获得优良烧结指标的重要保证。通过实验,研究了返矿粒度组成对烧结矿质量的影响。实验结果表明,与小粒级返矿相比,粒度大于6 mm返矿具有较高的熔化特征温度,并且制粒后大粒级返矿的粘附粉数量减少;当烧结混合料中大于6 mm返矿比例超过20%时,烧结矿质量不佳;在相同二元碱度条件下,返矿粒度过粗,烧结过程中铁酸钙生成数量降低,烧结矿强度指标恶化。为获得良好的烧结指标,烧结混合料中大于6 mm返矿比例应控制低于20%。     

烧结返矿参加配料计算的探讨

烧结传统配料计算法对返矿影响考虑不足,将返矿视为常数,保持恒定不变,不参加配料计算。如果把返矿纳入配料计算,能缩短配料调整周期,使烧结配料及调整更准确更及时,可以有效地提高烧结矿的产量和质量。     

烧结配加矿化剂的试验研究

在试验室条件下,研究了钒钛磁铁精矿配加矿化剂对烧结过程及成品的影响。结果表明,配加矿化剂后,成品率提高2．26％,利用系数提高9．60％,烧结矿矿相组成和热强度明显改善,RI指数升高1．12％,RDI指数下降1．41％。     

烧结返矿提前润湿工艺的应用

通过对烧结返矿采用提前加水润湿工艺，强化返矿作为混合料造球的“核心”作用，不但减小了一次混合料水分波动，而且提高了混合料的成球速度和成球率，改善了烧结料层透气性，对提高烧结矿产、质量有很好的效果。     

提高钒钛磁铁精矿烧结产质量的研究

试验结果表明,热风烧结可以提高钒钛磁铁精矿烧结矿的成品率和转鼓强度,硼泥、氧化剂和ＭｅＯ对提高烧结矿的产质量有明显的效果,其中硼泥效果最佳。添加１％的硼泥,利用系数提高３％,转鼓强度提高２．４％,成品率提高４％。     

烧结工艺优化的试验研究

针对湘钢采用高铁低硅烧结的特点,虽然提高了入炉烧结矿品位,但会使烧结矿强度、粒度、冶金性能等明显变差.采取添加蛇纹石的试验和生产,结果表明:烧结矿的SiO2含量略有提高,但改善了高铁低硅烧结矿中液相少、强度差的状况,使返矿率下降,固体燃耗量降低,烧结矿的还原性和软熔性能得到改善.针对湘钢高炉渣Al2O3含量高的实际情况,解决增加MgO会影响烧结矿强度的问题;工业试验表明:用轻烧白云石部分代替白云石对烧结矿的产量没有明显的影响,转鼓强度稍有提高,固体燃耗明显下降,高炉利用系数提高,焦比下降,炉渣流动性好.在降低烧结矿低温还原粉化率方面,喷洒约3?Cl2溶液是非常有效的.     

A neural network based model of sinter quality and sinter plant performance indices

Abstract

A prerequisite of a smooth operation of the ironmaking blast furnace is that the quality of the burden is stable. In blast furnaces where sinter is used as the (main) iron bearing material, its quality plays a crucial role in productivity and fuel economy. Simultaneously the corresponding factors must be considered for the sinter plant. The present paper studies the influence of three variables characterising the bedding piles and five sinter plant operation variables on sinter quality, sinter plant productivity, specific fuel consumption and share of cold return fines. Daily mean values for a period of five years of operation were used in the data driven modelling based on feedforward neural networks. The resulting models were found to describe the major changes in the outputs well. The input–output relations captured by the models were analysed by perturbing one input variable of the networks at a time and analysing the predicted behaviour of the outputs.     

冀东铁精矿配加细粒澳富粉烧结试验

澳富粉粒度很细,配入冀东铁精矿中烧结,使烧结矿质量下降。为改善烧结矿质量,在实验室进行了提高配碳量、增加高硅球团返矿量和提高碱度的试验研究。结果认为,提高碱度是最有效的措施。     

烧结热返矿槽料位上,下限检测

研制了适合烧结厂热返矿槽料位上，下限报警装置，该装置解决了高温且物料流速较慢的矿槽料位上，下限检测的技术问题。装置运行可靠，误差小，成本低，适用于一般高温粉状及颗粒状矿槽料位上、下限检测。     

Al2O3在钒钛烧结矿中的行为研究

针对攀钢钒钛烧结矿Al2O3含量高的情况，在实验室对Al2O3在钒钛烧结矿中的行为进行了试验研究，结果表明，Al2O3含量增加对钒钛烧结矿的产量，质量有不利影响，钒钛烧结矿中的Al2O3主要以固溶体形式贮存于除钙钛矿外的其他矿物相，它对烧结矿的矿物组成和结构有较大的影响。     

全精矿低温烧结最佳工艺制度的研究

本文主要介绍三个烧结工艺参数──料层高度、燃料配比、烧结负压对烧结生产率、烧结矿质量、燃料消耗影响的试验研究结果。结果表明：全磁精矿低温烧结可以获得高产、优质、低耗的技术经济指标；低碳高料层操作是实现低温烧结的必要手段；烧结矿中ＰｅＯ含量对其还原性的不利影响较小．并得到了最佳烧结工艺参数。     

Influence of sinter grate suction pressure (flame front speed) on microstructure,productivity and quality of iron ore sinter

Abstract

From 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%.