多层含碳球团转底炉内直接还原行为

 为明确转底炉内多层布料下球团的还原规律,采用含碳球团直接还原钒钛铁精矿,研究了还原温度和还原时间对不同层球团金属化率的影响以及铁精矿中各铁矿物的还原顺序。结果表明:多层球团的还原不同步,在上层球团还原完成并发生再氧化时,下层球团的还原仍在继续。球团的平均金属化率会随着还原温度的增加而提高,随着还原时间的延长出现先增高后降低的现象。在还原过程中存在一个获得最大金属化率的最佳还原时间（本试验为25min）。钒钛铁精矿中各铁矿物还原的难易程度按下列顺序依次增加：Fe2TiO5→Fe3O4→FeO→Fe2TiO4→FeTiO3。     

A Computational Study on the Reduction Behavior of Iron Ore/Carbon Composite Pellets in Both Single and Multi-layer Bed Rotary Hearth Furnace

Metallurgical and Materials Transactions B - A phenomenological model for the reduction of iron ore/carbon composite pellets in a multi-layer bed rotary hearth furnace has been developed. A single...     

直接还原转底炉转速控制系统设计

直接还原转底炉因其工艺独特,能够有效处理冶金污泥粉尘、红土镍矿、复杂难选矿等物料,日益受到治金行业的关注。直接还原转底炉工艺控制最核心部分之一就是还原物料的周期,即必须按照生产工艺的要求的时间完成一个旋转周期,转速控制精度要求高,误差小。文章介绍了直接还原转底炉液压系统原理、控制系统组成、程序设计。     

谈转底炉的发展

对目前国外转底炉炼铁发展和工艺进行了综合阐述，主要包含INMETCO 和Fastmet工艺，从Fastmelt的发展，到生产规模最大的美国动力钢的IDP，以及日本神户制钢、美国Midrex公司联合开发的转底炉生产铁块（Nuggets）的所谓Itmk 3（第三代炼铁法）等多种工艺。同时，对中国引进和发展这项技术阐述了其必要性和可行性。     

转底炉生产直接还原铁的工业性试验

为验证转底炉生产直接还原铁的可行性和经济性,采用云南铁矿资源组织开展了转底炉生产直接还原铁的工业性试验,共生产金属化率为79.29%的直接还原铁991.67 t。主要技术经济指标为:还原剂煤耗301 kg/t,发生炉煤耗290 kg/t,生产成本1 179.23元/t。试验结果为转底炉直接还原铁工艺的开发提供了理论依据。     

煤基直接还原转底炉振动布料机的设计

详细分析了第一代布料机的结构特点,指出第一代布料机在转底炉直接还原工况中存在的弊端,提出转底炉直接还原工况对振动布料机的要求及重要影响因素,介绍了振动布料机的设计方法及实践应用情况。     

转底炉直接还原工艺的应用及发展趋势

对转底炉直接还原工艺特点及该工艺处理冶金粉尘、红土镍矿、复杂难选矿、钒钛磁铁矿、转底炉生产珠铁等进行了介绍,并对转底炉处理不同原料的工艺现状进行了分析.目前转底炉工艺在应用上仍有一些技术难题,需要不断完善转底炉工艺和设备,发展转底炉直接还原技术有利于促进国内直接还原产业的发展,对国家钢铁工业的结构调整提供技术支撑,对钢铁行业提高资源综合利用水平、节能降耗、实现可持续发展具有重要意义.     

多晶莫来石纤维在环形加热炉的应用

介绍了多晶莫来石纤维的特性及其施工方法,对比分析了环形加热炉炉衬粘贴多品莫来石纤维贴块前后的炉壁温度变化,并对其应用和节能效果进行了总结.     

环形加热炉应用蓄热式燃烧技术分析

提出了环形加热炉应用蓄热式燃烧技术存在的问题,介绍了蓄热式燃烧技术在国内一些环形炉上的应用情况,提出了环形加热炉应用蓄热式燃烧技术的几点建议。     

转底炉耐火材料砌筑新工艺

介绍了国内首座20万t/a含锌尘泥转底炉耐火材料砌筑工程中,各关键部位的砌筑新工艺,在充分准备、提前消化、统筹安排、改进工艺的前提下,最终确保了施工一次性通过验收,取得了良好的经济及社会效益。     

蓄热式燃烧技术在环形炉上的应用

简述了自身蓄热式高温空气燃烧技术的原理及特点,介绍了自身蓄热式高温空气燃烧技术在170机组Ф21m环形炉上的改造应用情况,证明自身蓄热式燃烧技术在环形炉上具有推广应用价值.     

用硫酸从转底炉粗锌粉中浸出锌

研究了用硫酸从转底炉粗锌粉中浸出锌,考察了硫酸质量浓度、浸出温度和时间、固液质量体积比、搅拌速度对锌浸出率的影响.结果表明:在硫酸质量浓度230 g/L、浸出温度35℃、固液质量体积比1/4、浸出时间80 min、搅拌速度400 r/min条件下,锌浸出率达95％ 以上,浸出效果较好.     

Reduction of Carbon-bearing Pellets of Oolitic Hematite in a Shaft Furnace

When carbon-bearing pellets of oolitic hematite are treated in a shaft furnace,some problems are typically encountered:the metallization ratio of the metal pellets is low;the carbon-bearing pellets bond with each other at high temperatures;and the separation of phosphorus from iron is difficult.To solve these problems,experiments were conducted on oolitic hematite reduction in a resistance furnace and semi-industrial test shaft furnace.The results showed that the metallization rate reached 90% or greater under the conditions of a reduction temperature of 1 150℃,an atmosphere of simulated flue gas,and a reduction time between 1.5and 2.0h.The problem of high-temperature bonding among pellets can be solved by increasing the strength of the pellets,coating their surface with a surface transfer agent and maintaining an even temperature inside the shaft furnace.The basicity of the ore blend exerted no obvious effect on the magnetic concentrate and phosphorus content.The phosphorus content in the magnetic concentrate can be further reduced by improving the grinding capacity of the ball mills used in the experiments.On the basis of the experimental results related to oolitic hematite reduction with carbon-bearing pellets in a shaft furnace,the experimental requirements were satisfied with an average 88.27%total Fe content and 0.581% P content in the pellets.     

转底炉直接还原铁的工艺分析

介绍了转底炉直接还原铁的演变,分析了此种方法的工艺、结构、优点及国内外的现状,提出了转底炉直接还原具有强大的市场前景。     

Evaluation of a New Process for Ironmaking: a Productivity Model for the Rotary Hearth Furnace

In order to address the key issues of capital costs and CO₂ emissions in ironmaking operations, a new process was proposed combining a Rotary Hearth Furnace (RHF) and a Bath Smelter. This paper describes the construction of a productivity model for the RHF based on previous studies concerning the reduction behaviour of pellets of carbon and iron oxides. The model was used to estimate changes in RHF productivity according to the type of carbon used in the RHF pellets, numbers of layers of pellets, final metallization degree of the direct reduced iron (DRI) produced, and initial sizes of the pellets. The results indicate that productivity gains between 33 and 46% can be achieved replacing coal with wood charcoal, a carbon source virtually free of net CO₂ emissions. Also, the productivity of the RHF can be doubled by reducing the charge only up to 70% metallization. The model allows the study of changes in overall energy consumption due to changes in the extent of primary oxidation of the gas at the pellet level showing that the use of wood charcoal increases the total amount of carbon consumed by less than five percent relative to operations with coal.