铁矿石综合评价方法及其在鞍钢的应用

依据鞍钢炼铁工艺参数,利用铁矿石综合品位法和模拟单烧计算法对鞍钢自产精矿和常用外购铁矿粉进行经济性评价;利用修正后的冶金价值评价法对鞍钢常用块矿进行经济性评价,对铁矿石综合品位和模拟单烧计算品位的关系进行拟合。以模拟单烧计算品位为依据,分别对自产精矿和外购粉矿综合品位计算公式进行修正,修正后的评价方法能够指导企业铁矿石采购和降低炼铁成本。     

烧结常用铁矿粉高温基础性能试验研究

结合铁矿石资源市场变化,对烧结常用铁矿资源进行合理归类,选取具有典型代表的铁矿粉进行基础特性试验研究,通过单种矿粉和多种矿粉的性能搭配试验,分析同化温度、液相流动性、铁酸钙生成能力等性能的变化趋势,为性能优化配矿改善烧结矿质量和结构优化实现结构降本提供了技术指导。     

大力推进我国球团矿的生产

一、推进我国球团矿生产的必要性和紧迫性1.从粉状铁矿石的基本造块原理说起现代铁矿开采富铁块矿已越来越少,绝大部分是粉矿和经磨选的细精矿。为了满足现代炼铁生产的要求,必须将粉状铁矿石进行造块,将其生产成具有一定     

铁矿粉粒度组成对球团矿性能影响的研究进展

随着高炉炼铁对铁矿石品位要求的不断提高,贫矿资源被大量开发利用,使得选矿工业不断发展,可提供大量细磨铁精矿粉.由于细精矿易于成球,且有利于提高球团强度,因此适用于用球团法处理.铁矿粉基础物性作为影响球团矿性能的重要因素之一,铁精矿的预处理工艺和调整适宜的铁矿粉粒度组成是改善球团矿质量的关键所在.文章根据目前国内外研究工...     

柳钢铁矿石采购和生产评价体系的研发和应用

为了做好铁矿石采购、优化配矿工作,柳钢进行了铁矿石采购和生产评价体系的研发设计和实际应用。柳钢铁矿石采购和生产评价体系包括单种矿性价比模型、烧结一球团一炼铁联动优化配矿模型两大模块,单种矿性价比模型是基于矿石化学成分、物理性能(烧损、水分等)的经济价值测算模型,可实现对同种类单种矿石性价比高低进行评价;烧结一球团一炼铁联动优化配矿模型是基于铁水成本的优化配矿模型,可根据实际情况选择不同计算方式,寻求不同计算条件下铁水成本最低的配比方案。     

用模糊数学建立铁矿粉评价体系的方法研究

评价烧结用铁矿粉,与传统的铁矿石评价是有区别的。铁矿石的评判标准中涉及到品位、软熔性、机械强度、粒度等,而在烧结过程中,造块的效率与质量除了受上述因素作用之外,还包括铁矿粉的化学成分、高温特性、微观结构等因素。为了建立更完善的烧结用铁矿粉的评价体系,就需要将这些指标全部考虑进去,然而,指标数量的增加使得指标之间的关系变得更为复杂,具有很强的模糊性。本文采用多因素层次模糊综合评判决策模型对某厂的5种铁矿粉进行了评价,结果与生产实践吻合。     

基于不同炼铁工艺的铁矿石低温还原粉化特征

 为改善铁矿石在炉内的低温还原粉化性能以适应多样的炼铁生产条件,以炼铁生产常用的烧结矿、球团矿以及块矿为研究对象,通过控制还原气体成分和温度的方式,考察并比较了不同种类铁矿石在高炉炼铁工艺和COREX非高炉炼铁工艺2种煤气条件下的低温还原粉化行为。试验结果表明,相同的还原气氛和温度条件下,烧结矿、球团矿以及块矿的还原粉化形式、程度有较大差异,而各类铁矿石对煤气性质、温度变化的敏感性也各不相同。这对更为全面地考察和评价不同类型铁矿石的低温还原粉化特征,进而改善铁矿石冶金性能和优化炼铁工艺参数具有一定的实用性和参考价值。     

基于青钢铁矿粉烧结基础特性的配矿原则探讨

为了给烧结生产优化配矿技术提供基础依据,更好地指导烧结生产,对青钢烧结常用的6种铁矿粉的同化性能、液相生成特性以及烧损和结晶水分解特性等高温基础性能和微观结构进行了研究,且运用评价模型对各铁矿粉进行了评分。结果表明,各铁矿粉的同化温度均未超过1 250℃,可以满足低温烧结的条件,同化性能最好的为铁矿粉E;1 240℃时6种铁矿粉的流动性指数较适宜低温烧结,1 280℃时流动性指数和液相生成量均较高;6种铁矿粉中铁矿粉E的烧损值和结晶水值均处于较高水平,其中铁矿粉F的结晶水含量是6种矿粉中最高的;6种铁矿粉的微观形貌差异较大,铁矿粉C和D表面较光滑,吸水能力差,从制粒的角度上来看,不利于改善制粒效果,而铁矿粉A和B的表面较粗糙,适宜制粒;基于评分的高低将铁矿粉划分为4个等级。     

基于主成分分析的烧结铁矿粉性能评价

针对烧结铁矿粉评价体系存在的不足,提出了一种新的基于主成分分析的铁矿粉烧结性能评价方法。该方法综合考虑了化学成分、粒度、表面特性、同化性、液相流动性等性能指标,采用主成分分析方法,提取了铁矿粉烧结特性指标。新的综合特性指标不仅减少了评价指标的数量,且指标之间相互独立,避免了重叠。在新综合特性指标的基础上,进一步建立了烧结铁矿粉性能综合评价体系。     

铁矿粉高温性能特征数的配合性研究

利用"高温性能特征数"对铁矿粉的高温性能进行评价,在对单种铁矿粉的高温性能进行实验分析的基础上,增加了对混合矿高温性能的实验研究。通过对铁矿粉的两两混合、三三混合及四四混合进行实验,以此来揭示混合矿的高温性能与单种矿高温性能之间的关系。经实验研究发现,混合矿的高温性能与单种矿的高温性能近似满足线性相关性,其可用来指导配矿。     

Tin and zinc separation from tin,zinc bearing complex iron ores by selective reduction process

Abstract

Tin, zinc bearing complex iron ores are typically intractable and have not been efficiently utilised in China. In this investigation, the process mineralogy of the tin, zinc bearing iron ores and reduction behaviours of iron, tin and zinc oxides by CO were investigated. A selective reduction roasting process was initially developed to separate tin and zinc from the complex iron ores. Under optimum conditions, most of the tin and zinc were effectively removed from the iron ore pellets, and the roasted pellets could be used as high quality ironmaking burdens for large scale blast furnaces.     

Optimisation of the blast furnace burden based on its primary slag formation behaviour

The iron ore consumption doubled several times due to the rapid development of ironmaking industry in China, resulting in the worse quality of iron ores in the past decade. Therefore, the efficient utilisation of poor quality iron ore resources is of great importance for the sustainable development of ironmaking industry. In this work, a new method for optimisation of blast furnace burdens was studied based on the primary slag formation behaviour because it has significant influence on the formation of the cohesive zone. The results showed that there was obvious interaction between sinter and acid iron ores at high temperature, and the primary slag formation behaviour was clearly improved by the high temperature interaction. The poor quality lump ore could be utilised together with high basicity sinter and self-fluxed pellet to enhance the high temperature interaction. Besides, increasing CaO and MgO content in blast furnace burdens would further improve their primary slag formation behaviour and the performance of cohesive zone.     

铁矿石经济性评价

本文通过将目前常用的铁矿石经济性评价方法与传统理论评价方法相结合，研究出用烧结工艺与炼铁工艺综合加工成本评价铁矿石经济性的一种新方式，完成对烧结用铁料和高炉用铁矿石经济性的定量评价。     

Recent collaborative researches between Japanese universities and steel industry on the iron ore agglomeration process

The properties of iron ores used in ironmaking process have been drastically changed in the past couple of decades.Especially,the change has become significant in the last few years because of the considerable increase in the world steel production.The property change of the iron ore is mainly caused by the depletion of the hard and high-grade lump hematite ores.It has led to the increasing use of ores containing a larger amount of goethite/limonite,i.e.,hydro-oxides of iron.Typically,the proportion of p...     

Shift From Coke to Coal Using Direct Reduction Method and Challenges

 Ironmaking involves the separation of iron ores. It not only represents the first step in steelmaking but also is the most capital intensive and energy intensive process in the production of steel. The main route for producing iron for steelmaking is to use the blast furnace, which uses metallurgical coke as the reductant. Concerns over the limited resources, the high cost of coking coals, and the environmental impacts of coking and sinter plants have driven steelmakers to develop alternative ironmaking processes that can use non coking coals to reduce iron ores directly. Since the efficiency and productivity of modern large capacity blast furnaces will be difficult to surpass, blast furnaces will continue to retain their predominant position as the foremost ironmaking process for some time to come. The alternative ironmaking processes are therefore expected to play an increasingly significant role in the iron and steel industry, especially in meeting the needs of small sized local and regional markets. It is likely that the importance of direct reduced iron (DRI) and hot metal as sources of virgin iron will continue to increase, especially in the developing countries where steelmaking is, and will be, primarily based on electric arc furnace (EAF) minimills. Consequently, the challenges that are faced by the new technology have to be embraced.     

低温冶金技术理论和技术发展

低温冶金通过细化铁矿粉、并运用催化等手段来研究加快铁矿粉在较低反应温度下的还原速度的理论和方法,为开发低能耗、低碳排放、高效的非高炉炼铁新工艺提供理论基础。低温还原理论方面的研究成果,包括细微铁矿粉具有纳米晶粒、储能的铁矿粉能够提高还原气体的利用效率、细粒度改善反应效率、催化剂提高反应速度、改善低温冶金反应的传输条件、多级循环流化床的流化规律以及低温还原冶炼粒铁等理论。在低温还原冶金新技术方面包括改进的熔融还原炼铁工艺、优质海绵铁和粒铁的低温还原工艺。低温还原工艺有望实现节能、低碳、高效和低成本冶金,并能应用于低品位铁矿、含铁冶金渣、赤泥以及钒铁磁铁矿、钛精矿等的综合利用。     

Mixed State and High Effective Utilization of Pilbara Blending Iron Ore Powder

 Pilbara blending iron ore powder (PB powder) is blending ores with good and poor quality iron ores, so how to use PB power effectively is a problem. The self-characteristics of PB powder and its single-components were studied respectively, such as the macroscopic properties, microscopic properties, and high-temperature properties; the behavior and effect in the sintering were mastered. Then based on the new ore-proportioning idea of iron ores sintering characteristics complementary, the principles on the effective use of PB powder were discussed, and was further validated through the sintering pot test and industrial production. The results show that: PB powder is composed of three kinds of iron ore, and the sintering characteristics of different iron ores are obviously discrepant. With the ore-proportioning optimization based on the iron ores sintering characteristics complementary, the proportion of PB iron ore powder can be increased to more than 45%.     

煤基直接还原炼铁技术分析

分析了主要的煤基直接还原炼铁工艺。回转窑反应温度低,导致动力学条件变差,停留时间长,散热大,吨铁煤耗达到1000 kg左右。从能量利用角度,过多的煤气还需换热加以利用。隧道窑通过罐装矿粉,可省去造球工艺,但是罐子传热只能通过对流与传导换热方式,因此,停留时间长,热量损失大,同时罐子、海绵铁的余热、废气热量尚未得到利用,导致煤耗高达1 500 kg/t海绵铁。转底炉由于温度高,反应速度快,但是热能利用率差,吨铁实际煤耗居高不下。可见,目前的煤基直接还原炼铁工艺,离低能耗、低污染的炼铁目标相差甚远,最大的问题是固态条件下的还原反应效率过低,提高铁矿的低温反应性能是煤基直接还原炼铁走向成功、高效、环保的关键所在。     

铁焦高温冶金性能评价方法的研究进展

摘要：铁焦作为低碳高炉炼铁的一种新型碳铁复合炉料,其高温冶金性能至关重要。铁焦的高温冶金性能直接关系到其在高炉内的实际应用以及高炉的冶炼效率。国内外相关学者对铁焦的高温冶金性能做了试验研究,并相继提出了评价铁焦高温冶金性能的新方法。但是,目前还没有统一的合理的铁焦高温冶金性能评价方法。总结了当前铁焦高温冶金性能评价方法的研究现状及进展。同时,采用各种方法评价铁焦高温冶金性能,并与相同条件下焦炭的高温冶金性能进行对比。通过分析比较,并结合高炉冶炼的实际情况,提出了较为科学的评价铁焦高温冶金性能的新方法。新评价方法的提出,将为铁焦的生产制备和高炉应用提供理论参考。