支架面积对支撑烧结过程的影响

烧结矿的多孔结构形成过程中,燃烧熔融带上的烧结矿荷重会引起气流阻塞,导致生产率降低及成品烧结矿质量差。为了减轻重力的影响,一种新的烧结技术——支架支撑烧结应运而生。通过在料层内安装支架来支撑烧结矿,进而减少由重力和抽风所引起的料层收缩,使下部料层获得较高透气性。本文通过烧结杯实验,考察了安装不同尺寸支架对烧结指标和烧结矿冶金性能的影响。实验表明,应用尺寸为300×100 mm的支撑板,烧结利用系数、烧成率、成品率、转鼓强度等指标是各组实验中最好的,尽管还原度略有下降,但仍可满足生产要求。     

料层减荷烧结提高生产率工业试验

提高烧结机利用系数是满足钢铁市场旺盛需求、降低成本的有效途径.在不改变原有烧结工艺参数的条件下,通过在烧结台车上安装支撑板减轻下部料层荷重,改善料层透气性,增加通过料层的风量,进而提高烧结机产量.在烧结杯试验的基础上,给出了工业生产用支撑板的形状设计、在台车上的布置方式以及对支撑板材质的要求.两阶段工业试验表明,安装支撑板后,烧结产量平均提高6.34%;转鼓强度平均下降0.07%,仍保持在同一水平;筛分和抗磨指数改善.烧结生产稳定,取得了良好的经济效益.     

改善高料层烧结过程透气性的新技术研究

针对料层厚度在650mm以上的高料层烧结所出现的烧结过程料层透气性恶化的问题，进行了一系列改善高料层烧结过程透气性的新技术研究，开发出透气板和料面松料器两种新装置，并在烧结杯试验中验证了明显改善烧结过程透气性的作用，强化了高料层烧结。采用透气板或料面松料器装置，烧结矿产品质量指标明显改善，利用系数提高了14．5％-23．6％，转鼓强度提高1．17％-1．33％，固体燃耗降低0．5kg／t烧结矿。     

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.      

太钢减荷烧结技术试验研究

针对700 mm以上的高料层烧结过程中,出现烧结过程料层透气性恶化的问题,在太钢技术中心进行了采 用支撑板改善烧结过程料层透气性的烧结杯试验研究,试验结果表明:采用350 mm高度支架支撑作用效果最好, 料层收缩显著降低,利用系数提高了15.2%,转鼓强度保持原有水平,烧结矿冶金性能改善。     

1999年重点大中型钢铁企业主要技术经济指标(烧结)

序号单　位 利用系数t· m- 2· h- 1烧结矿品位 /%烧结燃料消耗 /kg· t- 1序号单　位 利用系数t· m- 2·h- 1烧结矿品位 /%烧结燃料消耗 /kg· t- 1原重点 1.35 0 5 4.716 12 5杭钢 2 .35 5 5 4.37—原骨干 1.7395 4.6 35 92 6马钢 1.2 5 0 5 5 .16 6 52 7合钢 1.7135 2 .97 5 71首钢 1.310 5 6 .934 7 2 8三钢 2 .176 5 7.6 0 5 02天铁 1.35 0 5 2 .94712 9新余 2 .12 45 3.885 83邯钢 1.5 86 5 6 .896 6 30南昌 1.9885 5 .395 34承钢 1.2 145 0 .2 880 31萍钢 2 .0 82 5 5 .0 96 35宣钢 1.2 70 5 2 .35 7132济钢 1.76 7 5 6 .2 5 5 06…     

柳钢110m^2烧结机技改工程固体燃料破碎系统工艺设计

1前言 柳钢110m^2烧结机工程对燃料粒度的要求非常严格，燃料粒度过大或过小，都将增加煤粉用量，使烧结固体燃耗升高，烧结矿质量变坏。当烧结混合料中煤粉粒度过大（〉3mm）时，将造成燃烧带变宽，料层透气性变差，燃料在料层中的分布亦不均匀，大颗粒周围过熔，离大颗粒远的地方则不能充分固结；在布料时还易形成偏析而使燃烧集中于料层下部，造成烧结料层上下温差加大，导致上层烧结矿结构疏散，强度不好，     

1999年我国重点钢铁企业烧结主要技经指标

企业利用系数/t·m-2·h-1烧结矿品位/%烧结燃料消耗/kg·t-1首钢1.31056.9347天铁1.35052.9471邯钢1.58656.8966太钢1.41066.2160包钢1.26055.4467鞍钢1.46052.8065本钢1.43056.5954宝钢1.24058.8549梅山1.57056.6058马钢1.25055.1665济钢1.76756.2550莱钢1.46054.2959武钢1.44056.0053湘钢1.60051.6263重钢1.47051.1072攀钢1.27047.3270水钢1.53052.8173酒钢1.43048.02671999年我国重点钢铁企业烧结主要技经指标…     

添加大颗粒后复合烧结料层的烧结行为

近期,由于增加烧结矿石中褐铁矿的配比,导致烧结料层透气性和烧结矿成品率降低。一般认为,虽然烧结料层是多孔的结构,但烧结过程中料层中孔隙的崩溃导致这一系列问题。一些方法如通过在烧结混合料中插入棒条等松料器控制空隙率,改善料层透气性。但却带来安装和维护费用等问题。因此,对通过改变原料颗粒粒度控制料层结构,或调节局部料层的松散密实程度等措施进行了讨论。本文中,进行了烧结混合料中配加大颗粒料改善料层透气性的烧结杯实验。并讨论了该烧结混合料的烧结行。研究发现：粉料中配加大颗粒料后,粉料部分料层的堆密度降低。因此透气性增大,烧结垂速加快。同时,增加焦粉配比可以保持烧结矿成品率维持不变。结果,烧结产能大幅度提高。     

1999年技术经济指标总表

项目指标重点企业地方企业　　1999年　　1998年　　增减　　1999年　　1998年　　增减烧结利用系数/t·m-2·d-11.351.340.011.7391.7020.037烧结矿品位/%54.7153.980.7354.6353.381.25合格率/%93.0092.870.1378.1375.842.29作业率/%83.3185.26-1.9576.3986.94-10.55固体料耗/kg·t-16162-15966-7高炉利用系数/t·m-3·d-11.9931.8950.0982.4122.2420.170合格率/%99.9799.920.0599.9599.950.00综合焦比/kg·t-1———553564-11入炉焦比/kg·t-1426448-22489524-35热风温度/℃107510561999597619熟料比/%87.7388.47-0.7488.8884.564.32喷煤/…     

高配比磁铁精矿烧结技术的研究进展

 随着传统高品位铁矿石资源的日趋枯竭,烧结用铁矿石资源已经从赤铁矿类型逐渐转变为复杂综合的铁矿类型。但某些铁矿石的杂质和烧损较高,细粒级比例较多,严重影响了烧结性能和烧结矿质量,如烧结矿品位、强度和固体燃耗等。磁铁精矿具有含铁品位高、杂质低的特点,而且在氧化时能够释放出大量的热量。配加磁铁精矿不仅可以改善烧结矿质量,而且还具有减少烧结燃料消耗的潜力。然而,大多数磁铁精矿是经过处理后的铁矿粉,其粒度非常细,会对烧结料层透气性产生很大的负面影响,从而影响烧结过程,不利于烧结生产率的提高。在调查了磁铁精矿烧结特性的基础上,回顾和评论了高配比磁铁精矿烧结技术的最新进展,包括添加剂技术、原料预处理技术、预造块技术、复合烧结技术、气体燃料喷吹技术、双层预烧结技术等。通过分析烧结料层的透气性和控制烧结过程中的化学反应,论证这些新技术在高配比磁铁精矿烧结中的潜力,期望充分发挥磁铁精矿的优点,改善100%磁铁精矿或高配比磁铁精矿烧结混合料的烧结性能,为高生产效率条件下生产出优质低耗的烧结矿提供理论依据和技术方案。     

改善厚料层烧结热态透气性的研究

针对厚料层烧结过程中,因料层自动蓄热导致下部燃烧带过宽,热态透气性下降,影响垂直烧结速度,进而影响烧结矿产量的问题,通过实验研究分析了烧结过程中高温带宽度、温度分布特征及规律、以及燃料迁移、不同粒度燃料燃烧效率等对热态透气性的影响;提出了优化燃料粒度、改善燃料燃烧性、采用燃料分加结合熔剂分加等改善烧结过程热态透气性的技...     

Sintering behaviours of iron ore with flue gas circulation

Flue gas circulation is an important method for energy conservation and pollutant emission reduction in iron ore sintering. In this paper the effects of flue gas recirculation ratio on sintering of different iron ores including haematite, magnetite and limonite were studied by illustrating the variation of sinter bed temperature, atmosphere and mineralisation characteristics of different types of iron ores induced by the circulation. It shows that the proper flue gas circulation ratios for haematite, magnetite and limonite are 37, 30 and 25%, respectively. For magnetite ore, preheating and high consumption of oxygen in combustion zone caused more silicate minerals and less acicular calcium ferrite, thereby lowering sinter tumbler strength. As for haematite ore, the rapid change of temperatures of combustion, melting and solidification zones leads to elevated combustion efficiency and increased formation of acicular calcium ferrite, which enhances the sinter strength. When using limonite ore as the main raw material, high oxygen consumption, lower maximum temperature of sintering bed, higher cooling rate and larger porosity of sinter are observed.     

济钢320m~2烧结机配加经济矿料生产实践

经济矿料通常由褐铁矿或半褐铁矿组成,含铁品位低、杂质多,用于烧结生产易导致固体燃耗升高、烧结矿强度及烧结成品率降低等。济钢320m2烧结机通过采取优化经济料配矿、厚料层烧结并适当压料、降低焦粉粒度、添加助燃剂、稳定燃料结构等完善生产的措施,配加经济矿料最高达50%。生产实践表明,在保障高炉稳定顺行条件下,烧结配加经济矿料在30%时,各项经济技术指标较好,降低炼铁成本30元/t。     

Preparation of blast furnace burdens with middle-low basicity from high-SiO2-content iron concentrates by composite agglomeration process (CAP)

With the depletion of high-grade iron ores, iron and steel companies all over the world are expected to use refractory iron ore resources in the sintering process. Composite agglomeration process (CAP) was utilised to improve the sintering performances of high-SiO₂-content iron concentrates in this study. Theoretical calculation indicates that CAP is more effective for the agglomeration of high-SiO₂-content iron concentrates compared with traditional sintering process (TSP). The sintering pot tests results showed that the sintering yield of 74.15 wt-%, tumbler index of 72.75 wt-% and productivity of 1.54 t·(m²·h)^?1 were achieved, which is 9.12 wt-%, 10.70 wt-% and 0.45 t·(m²·h)^?1 higher than that by TSP, respectively. Moreover, CAP decreased the solid fuel consumption by 11.77 kgfuel/tproduct. Researches of metallurgical performances showed the CAP product can be used as high-quality blast furnace burdens. This investigation provides an effective route to utilise the inferior high-SiO₂-content iron concentrates.     

Effect of H2 O(g)Content in Circulating Flue Gas on Iron Ore Sintering with Flue Gas Recirculation

The influence of H_2O(g) content in circulating flue gas on sintering was studied by simulating the flue gas circulating sintering.The results show that the burning speed of solid fuel and the heat transfer rate during sintering process are improved when the H_2O(g) content increases from 0 to 6%,which accelerates the sintering speed.However,when the H_2O(g) content exceeds 6%,the over-wet zone in sinter bed is thickened,which deteriorates the permeability of sintering bed.In addition,the magnetite content in sinter increases,while the acicular calcium ferrite content decreases.Accordingly,the sinter yield and tumble index decrease with excessive H_2O(g) content.To guarantee the yield and quality of sinter,the favourable H_2O(g) content in circulating flue gas should be controlled to be less than 6%.     

Model of Iron Ore Sintering Based on Melt and Mineral Formation

A model of iron ore sintering was built with consideration of fuel combustion,catalysis of sinter mixture as well as formation of melt and mineral,which was verified via sintering pot tests and showed a good fit to the experimental results.The effect of bed depth on temperature was reflected by the residence time in high-temperature zone,rather than the top value of the temperature,which was weakened by melt formation as well as hematite decomposition.Moreover,the effect of bed depth,fuel content and distribution on sintering process was different,which was reflected by temperature profiles and the rule of calcium ferrite formation.The formation of melt as well as magnetite was a process which was decided by kinetic factors,while the formation of calcium ferrite was related to fuel blending conditions,which is determined by thermodynamics when the fuel ratio inside sinter granules is low or fuel content is high,otherwise,it is determined by kinetics.     

铁矿粉配料烧结经济评价体系的研究

应用技术经济评价的理论与方法 ,建立了铁矿粉技术经济评价体系 ,用该体系对铁矿粉的TFe、SiO2 、MgO、粒度极差和平均粒度进行量化评分 ,从而得出铁矿粉的技术经济价值指数 ,再筛选出技术经济价值指数 >0 9的铁矿粉进行优化配料 ,优化配料后的铁矿粉不仅能满足烧结对它的化学成分、粒度组成的要求 ,而且还能使烧结生产中料层透气性得到改善 ,烧结矿的产、质量得到提高 ,整个生产工序成本降低     

高比例扬迪粉烧结优化试验研究

介绍了扬迪粉(YD粉)烧结配矿优化试验情况及不同硅源对高YD粉配比烧结过程的影响.试验结果表明:用具有高孔隙度的YD矿替代B粉、C粉和E粉后,混合料水分应适当提高,以改善混匀制粒效果.因原料装料密度降低,使原始料层透气性得到改善,烧结生产率得到提高,烧结矿还原性略有改善,T<,D>-T<,S>区间和T<,D>-T<,m...