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Corrosion Mechanisms of SEN Slagband Materials

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China's Refractories 2013年第2期22卷 6-10页

作者： Harald HARMUTH Nathalie KBL Barbara ROLLINGER Guangmin XIA Chair of Ceramics Montanuniversitaet Leoben rhi AG Voestalpine Stahl GmbH

Wear of a zirconia graphite slagband material by mold slag during casting of a TRIP steel grade was investigated on worn specimens with respect to corrosion and erosion. Corrosion dissolution of both the stabilizer oxide and the zirconia is decisive. Oxidation is dominating graphite wear whereas a possible dissolution in the liquid steel was not observed to play an important role here. The ratio of oxide corrosion to graphite oxidation decreases with decreasing vertical distance of the hot face to the steel bath. Unfortunately and contrary to other applications of carbon bonded refractories in steel industry graphite exhibits to be wetted by mold slag in the special case investigated here： it still acts as a refractive component but only partly as an infiltration inhibitor. Infiltration is followed by zirconia corrosion thus reducing erosion resistance, but nevertheless also gas phase transport of slag components may cause exsolution of the stabilizer oxide in un-infiltrated regions.

关键词： zirconia, graphite corrosion mechanism slagband

Importance,Organization and Evaluation of Interlaboratory Tests

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China's Refractories 2018年第2期27卷 1-6页

作者： Gerhard URBANEK Steffen UHLIG rhi AG Leoben A-8700Austria QuoData GmbH Freising D-85356Germany

The importance of ＂precise＂ test values and their verification is growing in every industry throughout the world, lnterlaboratory studies constitute a basis for this. The high expenses and mathematical work required to carry out proper interlaboratory studies are frequently considered reasons not to conduct such studies. This makes it all the more important to emphasize the various advantages of an accurate interlaboratory study. In addition to providing precision data for the test method, it is also possible to carry out laboratory evaluations, which is important for accredited test laboratories. Furthermore, existing test methods can be optimized, refer- ence material can be obtained, and test methods can be compared. Optimized test instructions can also be generated using the findings and precision data. These advantages will be described in detail by means of examples below.

关键词： interlaboratory study round Robin tests test methods precision of test methods ISO 5725 standards

Approaches to High-grade Sintered Magnesia from Natural Magnesite

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China's Refractories 2020年第3期29卷 7-12页

作者： GUO Zongqi BI Deli MA Ying SUN Zhenlin Yingkou Jindai Technologies Jiachen GroupYingkou 115101China rhi Refractories(Dalian)Co. Ltd.Dalian 116600China

It is hard to manufacture high purity,dense sintered-magnesia from natural magnesite in the prevailing process of calcining and sintering,for two reasons:a)impurity,and b)low sintering activity of coarse-grained *** this paper,95%MgO magnesite was used as the starting material and finally magnesia of high density(3.47 g/cm^3)and high purity(98%MgO)was obtained after the flotation purification and a three-step sintering *** industrial scale of the beneficiation system of natural magnesite was introduced for magnesite *** lab experimental,the three-step sintering process was implemented by calcining,hydrating,re-calcining and sintering,which has proven the possibility of densified magnesia from natural magnesite.

关键词： magnesite flotation densification sintering

石油焦燃料的钒危害—替代型燃料石油焦中钒对玻璃窑炉蓄热室格子体的侵蚀

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石油焦燃料的钒危害—替代型燃料石油焦中钒对玻璃窑炉蓄热室格子...

2012年全国玻璃窑炉技术研讨交流会

作者： Christian Maicenovic Zongqi Guo Rongxing Bei 工广峰 rhi AG Technology CenterLeobenAustria rhi Dalian Research and DevelopmentChina rhi AG Industrial DivisionWiesbadenGermany

随着当前全球经济的发展及生产水平的持续提高,高温材料生产行业对能源的需求也日益增长。此外,能源的成本压力使得一些企业寻求替代型燃料。在1980年代出现第一座使用石油焦做燃料的玻璃窑炉后,越来越多的玻璃工业的企业开始将天然气...

随着当前全球经济的发展及生产水平的持续提高,高温材料生产行业对能源的需求也日益增长。此外,能源的成本压力使得一些企业寻求替代型燃料。在1980年代出现第一座使用石油焦做燃料的玻璃窑炉后,越来越多的玻璃工业的企业开始将天然气及重油的燃料切换为石油焦一更为便宜的燃料。但在这一燃料转换后出现的高侵蚀情况却越米明显,外来的由燃料引入的挥发物如硫,钒再加上其它如碱金属,镍及铁等有害成份对蓄热室材料的侵蚀最甚。本文主要讨论石油焦中的有害物尤其是钒氧化物如何影响蓄热室中的耐火材料,通过对石油焦侵蚀后的样本分析来讨论蓄热室的高纯镁砖及镁锆砖的侵蚀情况。

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Simulation of Mould Level Velocities During Continuous Casting of Round Bloom Strands With Mould-Electromagnetic Stirring

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Journal of Iron and Steel Research International 2012年第S2期19卷 884-887页

作者： BARNAMartin JAVUREK Mirko REITER Jurgen WATZINGER Josef KAUFMANN Bernhard HACKL Gemot Institute for Fluid Mechanics and Heat Transfer Johannes-Kepler-University-Linz Voestalpine Stahl Donawitz GmbH and Co KG Siemens VAI Metals Technologies GmbH and Co Voestalpine Stahl GmbH rhi AG Technology Center Leoben

In modern continuous casting of round steel blooms rotating electromagnetic fields are commonly employed to improve the product ***-electromagnetic stirrers(M-EMS)are used to excite a rotary motion along the solidification front in the liquid *** velocities lead to a better strand surface quality as well as enhancing the transition from columnar to equiaxed *** the usage of electromagnetic stirrers is widespread,not all effects are fully known or *** to harsh conditions at the plant,measurements are scarce and *** model experiments-an established alternative for investigating continuous casting of steel-cannot be used due to the low electrical conductivity of *** with liquid metals like mercury,Galinstan or Wood’s metal are either expensive or difficult to *** numeric simulations are essential to gain a better understanding of the processes involved in continuous casting with electromagnetic *** numeric simulations should always be validated with experiments and/or *** the velocity field inside the liquid core of the bloom cannot be measured at the caster,the velocity at the mould level can be measured by dipping a nail into *** skull forming at the tip of the nail is directly linked to the occurring surface *** measurements can then be compared with numeric simulations of the nail dipping *** numeric model is restricted to the upper part of the *** lower part of the strand is also taken into account through adjusted boundary conditions(velocity field *** from a simulation of the whole strand).In this work the influence of the stirring field strength on the simulation results will be *** the future these nail dipping simulations will be validated with plant *** can then to a certain extentvalidate the simulation of the strand with M-EMS too,as it serves as the basis for the nail dipping model.

关键词： continuous casting of steel mould-electromagnetic stirring velocity measurements finite volume method

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无钙硅砖在燃煤气玻璃窑小炉舌碹的应用

无钙硅砖在燃煤气玻璃窑小炉舌碹的应用

2015年全国玻璃窑炉技术研讨交流会

作者：王广峰 rhi奥镁公司

发生炉煤气以其良好的经济效益目前在我国仍是主要的玻璃窑炉燃烧方式之一,小炉是煤气与空气混合、预燃区域,是窑炉供热系统的核心,,而舌碹又是预混预燃的关键的部位,由于处于火焰喷出口处,各种气体在此处流速最大,因换向受到热冲击急剧... 详细信息

发生炉煤气以其良好的经济效益目前在我国仍是主要的玻璃窑炉燃烧方式之一,小炉是煤气与空气混合、预燃区域,是窑炉供热系统的核心,,而舌碹又是预混预燃的关键的部位,由于处于火焰喷出口处,各种气体在此处流速最大,因换向受到热冲击急剧,另外还受到飞料侵蚀。所以舌碹也是最薄弱的瓶颈部位,最容易最先受到侵蚀,冲刷及强烈热振的破坏,对于舌碹的设计必须考虑合适的耐火材料。

关键词：无钙硅砖燃煤气小炉舌碹玻璃熔化池炉

标准硅砖,无钙硅砖及电熔AZS在全氧玻璃窑炉的应用研究

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标准硅砖,无钙硅砖及电熔AZS在全氧玻璃窑炉的应用研究

2014年全国玻璃窑炉技术研讨交流会

作者：贝荣星 Klaus Santowski Christian Majcenovic Susanne Joerg 王广峰 rhi奥镁公司 rhi AG Technology CenterLeobenAustria rhiAG Technology CenterLeobenAustria

全氧燃烧玻璃窑炉由于其节能环保的特点成为一种发展趋势,然而伴随着这项燃烧技术,窑炉气氛中高浓度NaOH造成了对大碹及上部结构耐火材料的加速侵蚀。

关键词：硅砖无钙硅砖电熔材料大碹全氧玻璃熔化池炉

Defects Formation and Morphology in Large-sized MoSi_2 Rod Prepared by Continuous Extrusion

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China's Refractories 2007年第4期16卷 3-7页

作者： GAO Jianying JIANG Wan Research ＆ Development Center RHI （Dalian） Co. Ltd Dalian 116600 China State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences

Incidence of defects in MoSi2 rods prepared by con- tinuous extrusion is dependent on the viscosity of binder. Generally, low viscosity results in surface defects while high viscosity is responsible for inner defects. Cross-section observations indicated that the typical inner defects in sintered MoSi2 rods were large fissure cavity, multiple small holes and single small cavity, of which the characteristic ultrasonic reflection patterns have been experimentally established. Formation of the inner defects is attributed to the inhomogeneous feedstock moving behav- ior in die, which is aggravated with increasing viscosity of binder. Defect free MoSi2 rods were prepared successfully via con. tinuous extrusion by carefully controlling the viscosity of binder.

关键词： MoSi2 Continuous extrusion Inner defects Viscosity Moving behavior

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蓄热室碹及墙体的非碱性材料选择

蓄热室碹及墙体的非碱性材料选择

2011年全国玻璃窑炉技术研讨交流会

作者：王广峰 rhi GLAS GmbH奥镁玻璃公司

当今玻璃工业的快速发展的同时也遇到了诸如能源/原材料、环保法规及池炉新技术更新的挑战,对于池炉废气的处理及蓄热室材料的抗侵蚀研究也日益引起重视,除碱性耐火材料应用外,对蓄热室的碹及墙体部位材料的非碱性材料应用在特定条件下... 详细信息

当今玻璃工业的快速发展的同时也遇到了诸如能源/原材料、环保法规及池炉新技术更新的挑战,对于池炉废气的处理及蓄热室材料的抗侵蚀研究也日益引起重视,除碱性耐火材料应用外,对蓄热室的碹及墙体部位材料的非碱性材料应用在特定条件下也是适当的选择

关键词：蓄热室碹墙体非碱性材料