巴西铁精粉对承钢钒钛烧结的影响

试验研究了用较低熔点的巴西铁精矿粉代替高熔点海砂对承钢烧结矿的成品率、冷态机械强度、低温还原粉化及矿相组成的影响;经试验研究得出,当巴西铁精粉代替10％海砂时,提高了烧结矿成品率,改善了烧结矿粉化指标。     

提高钒钛烧结矿强度的探讨

根据承钢生产实践，及近年来攻关结果，分析了钒钛铁精矿自身特点，及配加普通铁精粉，碱度及ＦｅＯ含量等对烧结矿强度的影响，提出了提高钒钛烧结矿强度的途径。     

巴西精粉用于烧结的生产实践

本文分析了配用巴西精矿的烧结技术参数变化和技术操作;总结了烧结矿品位及技术经济指标变化趋势,并提出了进一步改进烧结矿质量的建议。     

不同普通铁精粉配比的含钛烧结矿矿相结构研究

针对承钢含钛烧结矿存在的强度差、低温还原粉化严重等实际问题,在实验室进行了不同普通铁精粉配比含钛烧结矿矿相结构的研究。结果表明:烧结原料中随普通铁精粉配比的增加,含钛烧结矿中金属相含量明显降低,而黏结相含量增加,其中钙钛矿含量降低,铁酸钙含量明显升高;显微结构逐渐均匀化,由粒状结构过渡到熔蚀结构,骸晶状钛赤铁矿含量降低;对应的烧结矿强度及低温还原粉化性能得到进一步改善。     

烧结配用硼镁铁精粉试验研究

通过对莱钢烧结原料配用硼镁铁精粉的烧结杯试验研究表明：配入一定比例的硼镁铁精粉。烧结矿的低温还原粉化指数和还原度均得以改善，并随着硼镁铁精粉配比变化，烧结矿低温还原粉化指数呈规律性变化。     

配碳量对细粒赤铁精粉烧结矿矿相结构及冶金性能的影响

对不同配碳量条件下的细粒赤铁精粉烧结矿矿相结构及冶金性能进行了系统研究。结果表明,当细粒赤铁精粉(司家营铁精粉)配加量为100%时,随着配碳量的增加,烧结矿显微结构逐渐均匀化,赤铁矿及硅酸二钙含量降低。当细粒赤铁精粉配比为50%~90%时,随配碳量增加,烧结矿转鼓指数先增加后降低;当细粒赤铁精粉增加到100%,随配碳增加转鼓指数提高。随配碳量的增加,低温还原粉化指数有所改善,还原度略有降低。烧结原料中随司家营铁精粉配加量的的增加,相应的配碳量应适当提高。     

首钢配加巴西精粉的烧结试验

为提高烧结矿品位,在首钢拟定烧结原料结构条件下,采用烧结杯制备烧结试样,进行配加巴西精粉的烧结杯实验,应用转鼓测试强度、光学显微镜和X射线衍射分析显微结构和矿相组成,研究了巴西精粉配比的增加对烧结矿技术指标的影响,重点探讨其与烧结质量的相关性。试验结果表明,提高巴西精粉的配比可以提高烧结矿的品位,使烧结矿品位保持在一个较高的水平(达55%以上);选取巴西精粉和印度粉配比的合理范围对提高烧结质量是非常必要的。     

钒钛烧结原料精确混配技术实践

单纯的钒钛烧结矿化学成分波动范围大、转鼓指数低、返矿率高,高炉渣铁流动性能差,给后序炼钢和提取钒钛造成很大困难,因此,需要在烧结过程中加入一定量的普通铁精粉,但其在混配过程中容易出现混配不匀、成分不稳的问题.本文分析了某钢铁企业钒钛铁精粉与普通铁精粉混配中存在问题的原因,提出了实现混匀矿精准混配的步骤与措施.通过实施运...     

轻烧水镁石用作济钢烧结熔剂的生产实践

对济钢烧结矿氧化镁的几种不同带入方式进行了工业试验和生产实践。指出在济钢目前生产条件下 ,在烧结生产中配加高 Mg O铁精粉和高 Mg O熔剂 ,是确保铁前系统稳定、优化高效的有效途径     

烧结矿中MgO配加方式的改进试验

对济钢烧结矿 Mg O的几种不同带入方式进行了工业试验和生产实践。指出在济钢目前生产条件下 ,在烧结生产中配加高 Mg O铁精粉和高 Mg O熔剂 ,是确保铁前系统稳定、优化高效的有效途径     

Three-dimensional structure and micro-mechanical properties of iron ore sinter

A new analysis method based on serial sectioning and three-dimensional (3D) reconstruction was developed to characterize the mineral microstructure of iron ore sinter. Through the 3D reconstruction of two types of iron ore sinters, the morphology and distribution of minerals in three-dimensional space were analyzed, and the volume fraction of minerals in a 3D image was calculated based on their pixel points. In addition, the microhardness of minerals was measured with a Vickers hardness tester. Notably, different mineral compositions and distributions are obtained in these two sinters. The calcium ferrite in Sinter 1 is dendritic with many interconnected pores, and these grains are crisscrossed and interwoven; the calcium ferrite in Sinter 2 is strip shaped and interweaves with magnetite, silicate and columnar pores. The calculated mineral contents based on a two-dimensional region are clearly different among various layers. Quantitative analysis shows that Sinter 1 contains a greater amount of calcium ferrite and hematite, whereas Sinter 2 contains more magnetite and silicate. The microhardness of minerals from highest to lowest is hematite, calcium ferrite, magnetite and silicate. Thus, Sinter 1 has a greater tumbler strength than Sinter 2.     

烧结矿显微硬度的研究

本文介绍烧结矿显微硬度的测试方法，并对梅山烧结矿中常见矿物和显微结构的显微硬度进行了测定研究，指出在烧结矿中增加铁酸钙和赤铁矿含量具有重要意义。     

鞍钢烧结矿的矿物组成和矿相结构研究

对鞍钢二烧和四烧的烧结矿进行了冶金性能检测和分析,并采用X射线衍射、光学显微镜和扫描电镜对二烧和四烧的高碱度烧结矿进行了矿物组成、矿相结构的分析与研究。结果表明,二烧和四烧烧结矿矿物组成与结构特征的差异分别与其化学成分和冶金性能的差异相吻合,两者矿物都以赤铁矿、磁铁矿或磁赤铁矿、铁酸钙、硅酸二钙和玻璃相为主。建议四烧适当降低配碳量,使其矿相结构更趋合理。     

700mm料高低硅全精粉烧结试验研究

利用小球烧结和燃料分加技术的有利条件,进行了低硅全精粉烧结技术的研究。试验研究结果表明,工艺上采取控制水分、燃料配比、机速等措施,使得低硅全精粉烧结矿质量稳中有升,高炉使用顺行,表明在太钢700mm料高条件下,实施全精粉烧结技术是完全可行的。     

Preparation of Mono‐, Di‐ and Hemicalcium Ferrite Phases via Melt for Reduction Kinetics Investigations

Iron ore concentrates that are used in the iron production are usually agglomerated into sinter or pellets in order to improve their properties in the blast furnace. The main minerals in the magnetite base sinters are hematite, magnetite and Si and Al containing calcium ferrites of which the latter can exist as either monocalcium ferrite, dicalcium ferrite or hemicalcium ferrite depending on the conditions and on the material's iron/calcium‐ratio. In order to study the reduction behaviour of the sinter in the iron production, samples of monocalcium ferrite, dicalcium ferrite and hemicalcium ferrite were prepared by melting different proportions of pure calcium and iron oxides. After melting the samples were cast and cooled. Samples of hemicalcium ferrite were also heated at a certain temperature before the actual reduction experiments in order to ensure the wanted phase composition of the samples. The mineral compositions of the samples were verified using scanning electron microscopy (SEM‐EDS) as well as X‐ray diffraction (XRD). The verification showed that it was possible to produce the samples of calcium ferrites via melting. The conditions needed to reduce the calcium ferrites were estimated with thermodynamic calculations.     

包钢烧结矿配加外购铁精矿生产实践

通过对配加不同比例外购铁精矿生产的烧结矿质量进行对比研究 ,达到确定最佳配比方案的目的     

The effect of dolomite addition on the properties of sinters produced from a high aluminous iron ore

This study provides a systematic approach to an evaluation of the sinter properties with increased MgO addition for superfluxed sinters produced from a high aluminous ore. The investigation revealed that part or full replacement of limestone by dolomite in the sinter mix leads to a drop in sinter cold strength, reducibility and production rate, but has a favourable influence on low-temperature reduction strength and probably better softening and meltdown properties. The change in sinter mineralogy due to the MgO addition has a paramount influence on the sinter properties. The Gua iron ore having a high alumina content, is easily amenable to sintering and the sinters produced can constitute a good burden material because of their high reducibility, good cold and hot-strength characteristics. Improved production rates can be expected by choosing dolomites having a smaller crystal size or choosing other suitable MgO-bearing materials. A high circulating load should be expected while producing MgO-bearing sinters.     

高铁低硅烧结矿研究

为满足高炉对入炉矿品位日益提高的要求,烧结矿中低熔点粘结相含量越来越低。为此,研究了在生产高铁品位,低硅含量烧结矿的条件下,如何改善烧结矿的冷强度。     

Influence of nature and particle size distribution on granulation of iron ore mixtures used in a sinter strand

Abstract

The ore mixture granulation process is described and the granulation fitness of a series of iron ores forming part of the mixture is studied. Good granulation and control of the maximum sintering temperature makes it possible to achieve the optimum sinter structure, formed by a hematite nucleus surrounded by a lattice of acicular ferrites. The granulation fitness of ore mixtures used to manufacture a series of sinters in a pilot plant are also determined. It is verified that sinters with an optimum structure have been obtained. A series of iron ores are classified using the granulation index (G index). The evolution of the G index of ore mixtures used in ACERALIA during recent years is considered and it is verified how improvement of the G index increases productivity and decreases coke consumption in the sinter strand.     

徐钢高铁低硅烧结矿的生产

徐钢根据自身的生产及原料条件,选用高品位低硅含铁原料,同时用生石灰作熔剂生产高铁低硅烧结矿。高炉使用该烧结矿后,产量提高13．7％,焦比下降8％。