八钢COREX使用烧结矿的可行性研究

为了使COREX炼铁工艺在八钢实现稳定、高效、低耗的生产目标,结合目前八钢高炉炉料结构和原料生产的情况,提出八钢COREX使用烧结矿的必要性.通过对八钢烧结矿、球团矿各性能的分析,得出八钢COREX使用烧结矿是可行的.     

八钢COREX炮泥准备初步探讨

文章介绍了COREX炉影响铁口稳定工作的一些因素,宝钢COREX炉炮泥使用情况、铁口表现及炮泥成分进行分析对比.对八钢COREX炉的铁口维护及炮泥成分调整提出了建议.     

八钢COREX炉整体气密性试验

COREX炉在烘炉前需要对其整体密封性进行检测,以确保COREX炉的正常生产.文章介绍了八钢COREX炉气密性试验过程.通过检测发现系统的漏点,并进行处理.     

八钢COREX炉新型煤干燥系统的的特点

文章通过对八钢和宝钢COREX入炉燃料的水分对比分析,提出了适应于新疆气候特点的八钢COREX炉的新型原煤干燥系统,并理论测算了新型干燥系统的干燥效果.为八钢COREX炉煤干燥技术的发展提出了新的思路.     

浅析新疆地区块煤用做COREX燃料的可行性

文章介绍了针对八钢1#COREX炉开炉前对新疆煤进行的初步分析及研究.通过对8种新疆煤煤质的分析,并将其分析结果与奥钢联的选煤标准和宝钢COREX用煤的内控标准进行了对比分析,初步筛选出了部分可满足八钢COREX生产要求的煤种.     

八钢COREX炉成功点火开炉

6月18日10时16分,历经两年建设期、两年生产准备期的八钢COREX炉成功点火开炉。它的建成,是八钢持续发展循环经济、打造绿色钢铁企业的一项重要举措,也是实现八钢新一轮发展战略的重要工程,开创了新疆非高炉炼铁技术的一个崭新纪元。     

龙钢高炉富氧技术应用

首先阐述高炉机前富氧技术的基本原理与可行性,利用将钢厂周边富余氧气资源通过长距离管道输送至高炉鼓风机旁,应用高炉机前富控制技术,实现高炉机前富氧,解决了高炉高效冶炼氧气供需矛盾,实现了高炉“提煤降焦、增铁保钢”的高效冶炼目标,达到节能、降本增效的目的。     

八钢欧冶炉(COREX)顶煤气除尘系统的改进

为充分回收八钢欧冶炉(COREX)竖炉顶煤气的物理热及压力能,提高TRT发电水平,在罗泾1~#COREX炉搬迁八钢项目中,对八钢欧冶炉(COREX)顶煤气除尘系统进行了改造。结果表明,顶煤气除尘系统由湿法除尘改造为重力除尘器和布袋除尘器的干法除尘后,TRT发电量得到显著提高;喷雾冷却装置的使用,在一定程度上解决了高温煤气进行干法除尘的技术难题。     

八钢COREX主要工艺技术改进

文章介绍了八钢COREX项目在迁建过程中结合八钢的生产实际,所做的设计优化和工艺技术改进..分析了这些工艺技术改进措施,并提出了八钢COREX以后努力的方向.     

低碳微合金化高级别船板钢冶炼工艺的研究

介绍了采用100t氧气顶底复吹转炉冶炼-LF炉精炼-RH炉精炼-板坯浇注工艺路线生产低碳微合金化高级别船板钢的生产工艺,采用该工艺可以生产出低碳、低磷、低硫和高洁净度的钢坯,满足轧制高级别船板钢的要求。     

平炉用氧冶炼情况简述

论述了平炉用氧冶炼时，氧在钢水中的化学过程和放热过程，系统地阐述了平炉顶吹氧气冶炼条件，耗氧量、吹氧时间及氧枪结构等特点。作为平炉炼钢最后阶段的记载，为炼钢技术研究提供了参考数据。     

Technical analysis on ironmaking process of rotary kiln pre- reduction and smelting by coal and oxygen

The traditional blast furnace ironmaking process has many problems such as long process flow, high dependence on coke and large environmental pollution. In order to solve these problems, the new ironmaking process of rotary kiln pre- reduction and smelting by coal and oxygen was developed. This new process has advantages of wide raw material adaptability, no coke consumption, less pollutant emissions and suitable for special iron ore resources. The mathematical model of the new process was established. Numerical simulation results show that the metallization rate of pre- reduction iron, smelting furnace gas oxidation degree and blast air oxygen content have great influence on coal and oxygen consumption. The coal and oxygen consumption reduces with the increase of pre- reduction iron metallization rate, the rise of oxygen degree of coal gas or the decrease of oxygen content of blast air. This process has a significant advantage in smelting special iron ore resources, which can make up the shortage of blast furnace ironmaking. It is also of great significance to reduce fuel consumption and CO2 emissions.     

Surface reaction controlled oxygen absorption in a Ta-8 W-2 Hf alloy: kinetics and concentration gradients

It is known that the rate of oxygen absorption in several bcc metals and alloys under conditions of low oxygen pressure and high temperature is controlled by the absorption rate of oxygen at the gas-metal interface, but the relationships between absorption rate, oxygen concentration gradient, and average oxygen concentration have not been studied in detail. In this paper these relationships are examined using several different solutions of the diffusion equation to represent the absorption process, and the relations derived are compared to oxygen absorption measurements for a Ta-8 W-2 Hf alloy under the appropriate experimental conditions. It was found that the absorption rate and oxygen gradient were accurately described by a solution of the diffusion equation using a constant oxygen flux into the specimen as the external boundary condition. The rate limiting step in the process is the oxygen absorption rate at the gas-metal interface. This phenomenological model should also properly describe the oxygen absorption behavior of pure metals under the same conditions when the process is controlled by the absorption rate at the gas-metal interface, provided the sticking coefficient does not change during absorption.     

RH用氧技术的发展与应用

阐述了真空处理用氧技术的进步,特别是从RH－OB到RH－MFB的不断改进,MFB顶枪在进行预热、吹氧脱碳及温度补偿功能并可防止处理过程中结瘤。真空处理用氧技术的进步,为我国超低碳系列纯净钢的发展奠定了基础。     

Comparison of Oxygen Transfer Parameters Determined from the Steady State Oxygen Uptake Rate and the Non-Steady-State Changing Power Level Methods

In this study, a laboratory scale Univ. of Cape Town enhanced biological phosphorus removal process was operated under controlled conditions at a solids retention time of 15 days. Results are presented for the process performance and oxygen transfer parameters determined by applying the steady state oxygen uptake rate (OUR) and the changing power level (CPL) techniques, as per ASCE standard guidelines. The testing periods were temporally separated to eliminate interference of the tests. During the application of the CPL method, the sludge volume index gradually increased and higher values of the oxygen transfer rate and alpha were measured, in comparison to the data from the steady state OUR method, under similar process performance. Furthermore, the mass transfer rate decreased as the CPL method of testing continued. In contrast, the oxygen transfer parameters remained uniform during the time when the OUR method was applied. The data indicated that the CPL method resulted in higher and variable oxygen transfer parameters, even though the process performance remained unchanged. Therefore, a more rigorous evaluation of the CPL method is recommended to clarify the validity of the test.     

氧气高炉的发展历程及其在北京科技大学的研究进展

首先介绍了氧气高炉的发展历程,早期的研究工作主要着眼于解决由于氧气代替空气鼓风而引起的“上冷下热”问题,并总结了各国研究者提出的氧气高炉流程及其主要特点。随后系统阐述了北京科技大学科研人员在氧气高炉工艺基础研究与工程技术开发方面所取得的主要进展。这些研究包括氧气高炉流程设计,含铁炉料还原与软熔,氧气鼓风及循环煤气喷吹条件下的煤粉燃烧,循环煤气加热过程中的物理化学变化等炉内反应与变化,以及在此基础上开展的回旋区及全炉数值模拟研究,为氧气高炉的工程化实施奠定理论基础。最后对氧气高炉的碳素流及节碳潜力进行了分析,并提出富氢碳氢循环氧气高炉将成为炼铁低碳化的重要发展方向。      

Fenton Process for Landfill Leachate Treatment: Evaluation of Biodegradability and Toxicity

The single Fenton or the Fenton process implemented in combined scheme as a posttreatment after the ferric chloride coagulation was applied for leachate collected from a real waste disposal site. Depending on the ratios of H2O2/chemical oxygen demand, H2O2/Fe2+, and pH, the Fenton oxidation or both the Fenton oxidation and the Fenton coagulation were involved in chemical oxygen demand reduction. The implementation of ferric chloride coagulation as a pretreatment stage or acidification of raw leachate did not result in the improvement of chemical oxygen demand reduction efficacy of the following Fenton process comparing with that obtained by the direct Fenton treatment of raw leachate. The direct Fenton treatment with a higher (3/1) H2O2/chemical oxygen demand ratio applied to raw leachate without pH preadjustment (H2O2/Fe2+ = 10/1), produced more oxidized organic compounds (measured as dissolved organic carbon/chemical oxygen demand ratio), more biodegradable by-products (measured as a 7-day biological oxygen demand/chemical oxygen demand ratio), and required a considerably lower dosage of NaOH for neutralization, making it preferable for the leachate treatment. Although up to a twofold reduction in the toxicity was observed after the overall Fenton process application, the treated leachate remained extremely toxic to Daphnia magna.     

变压吸附制氧法在冶金上的应用

介绍变压吸附制氧法的原理、工艺流程、设备、技术经济指标 ,以及在我国的发展和应用现状。该法与传统的深冷制氧法比较 ,具有基建投资少、运行成本低、自动化程度高、产氧快、安全可靠等优点 ,适合冶金工厂应用。     

Development of the Continuous Dephosphorization and Decarburization Process Using BOF

The authors propose a new refining process, by which hot metal is dephosphorized and decarburized continuously in the same basic‐oxygen furnace, with intermediate deslagging following dephosphorization. After decarburization, slag is kept inside the furnace and reused to dephosphorize the next charge so as to minimize the quantity of slag discharge. Experiments were made to clarify the properties of this process, using an 8‐ton experimental converter. The results confirmed high productivity or a higher rate of dephosphorzation achievable with an increased rate of oxygen blowing and the addition of iron ore. Because of the dephosphorization by low‐basicity slag and the hot recycling of decarburizationslag to dephosphorize the next charge, lime consumption was relatively low. The proper conditions of this process, such as the slag composition for dephosphorization, rate of oxygen supply, bottom agitation, and rate of intermediate deslagging, are also discussed, based on the experimental results.     

Decomposition,Reduction and Dissolution Mechanism of Calcium Sulfate in Iron Oxide Dust Pellet

Iron oxide dust generated during oxygen blowing in the BOF process contains a high content of iron. This iron oxide dust can be used as a material of iron source in the BOF slag reduction process or as de‐siliconisation flux or dephosphorization flux of hot metal pretreatment. One of the most practical uses of iron oxide dust is recycling as a form of pellets in the BOF considering easy application and the amount that can be recycled. In the process of making iron dust pellets cement is used as a binder that contains a lot of calcium sulfate. This calcium sulfate is reduced and dissolved in the molten metal during refining in the BOF. If the oxygen content in slag and molten steel is high enough, the reduced sulfate cannot be dissolved into molten metal and it can be removed as SO_x gas. The behaviour of calcium sulfate has been studied using of 50kg high frequency induction furnace and industrial‐scale plant tests were carried out at a 300ton BOF. The results show that for low carbon steels the evaporation of decomposed sulfate increases with increasing oxygen content in the slag while for high carbon steels the decomposed sulfate is reduced into the molten metal.