水煤浆气化操作条件对高铬耐火材料的影响

水煤浆气化是在高温、高压、强还原气氛下操作的 ,其气体成分及煤熔渣成分对耐火材料产生严重的侵蚀和损毁。通过分析气氛、熔渣及操作条件对耐火材料的影响 ,将有助于延长气化炉用耐火材料的寿命     

水泥预分解窑用碱性耐火材料的技术进展

介绍了水泥预分解窑的工作条件及其对窑衬耐火材料的影响 ,论述了目前世界水泥预分解窑的技术进展及其对窑用碱性耐火材料的要求 ,以及窑用碱性耐火材料的技术进展 ,分析了我国预分解窑生产技术的发展及预分解窑用耐火材料的发展 ,指出了中国预分解窑用耐火材料近期的发展趋势     

Effects of Refractories on the Total Oxygen Content and Inclusions in the IF Steel

The effects of refractories of quarz-corundum consisting of 45 mass% quartz and 55 mass% corundum,fused corundum and fused magnesia on the total axygen content(TOC) and the composition of inclusions in intersitital free(IF) steel were studied,3 mass% microsilica was added into the three refractories as binder.The refractories were shaped as lining of the graphite crucible by castable method IF steel was placed in the crucibles,then they were heated at 1600℃ for 90min and 45min respectively.Oxygen contents of the steel samples were obtained by axygen determinator.Inclusions were analyzed by SEM and EDS.The results show that the TOC of steel increase with ncrease of Index of Oxygen Potetial (IOP) of the refractories.The steel sample coped with MgO refractories having the lowest IOP has the lowest TOC.     

铝碳质耐火材料研究进展及展望

高温烧成铝碳质耐火材料是一种由氧化铝和炭素为基体原料,加入Al、Si、SiC等添加剂,用沥青或树脂等结合剂黏结烧成的耐火材料,被广泛应用于高炉炼铁、铁水预处理、炼钢、连铸等冶金工序中.耐火材料组成是其获得优质性能的基础,整理分析耐火材料中各组分对性能的影响,可以为开发低成本优质耐火材料提供理论支持和研究导向.本文总结了...     

Wear of MgO-C Refractories in EBT Type Furnaces Experienced at Iranian Mobarakeh Steel Plant

Mobarakeh Steel Company produces 3 million tons ofsteel annually with eight 180 tons EBT furnaces. Differ-ent types of magnesia-carbon refractories have been em-ployed at slagline during last 5 years. In the present studythe wear and corrosion of MgO-C refractories of these fur-naces have been studied via post-mortem analysis of usedbricks and the observation of operational effects. Laborato-ry corrosion tests were also arranged to investigate the effectof slag chemistry and the mechanism of chemical corro-sion. Characterization of different magnesia-carbon bricksclarified that the crystal size, type and chemistry of mag-     

SOME EFFECTS OF COAL ASH ON REFRACTORIES1

The action of coal ash on the following types of refractories was studied: (1) high diaspore brick, (2) fireclay refractories with very little quartz, (3) fireclay refractories with considerable quartz, (4) refractories containing a mixture of diaspore and fireclay, and (5) andalusite refractories. The tests were carried out in a rotary test furnace at temperatures ranging from 1500 to 1600°C. The phases present in the coal-ash refractory slag were identified by means of the petrographic microscope and consisted of magnetite, mullite, and glass. The effects of time of slag action and slagging temperature were studied.     

日本耐火材料发展动态

介绍了日本耐火材料产量及消耗、耐火原料情况、日本耐火材料工业发展的动态和含ＣａＯ耐火材料的现状．还简要介绍了日本耐火界对中国的看法。     

Improvement of the manufacturing process of carbon-containing refractories at magnezit works JSC and some results of their use in various metallurgical plants

The Magnezit Works Company has developed and is installing a technology for manufacturing spinel-periclase-carbon refractories based on molten powders of periclase and aluminomagnesia spinel. Pilot tests of the refractories in a steel-melting ladle have shown that they can compete with the best foreign counterparts. The effectiveness of use of ShPUP refractories in the functional layer of the bottom and the branch pipe of the vacuum chamber of a batch degasser is shown. A study directed at creation of ShPUP refractories with elevated operating characteristics for the slag lines of ladles is carried out. The application range of the refractories is expected to widen.     

Situation of China's Refractories Industry in Last Sixty Years

The annual output of China's refractories in 1949 was 74 thousand tons,and was 29.11 million tons in 2007,which was 65% of the world total refractories output.The export of China's refractory products and raw materials in 2008 was 6.18 million tons,which were exported to hundreds of countries and regions in the world.China is a big country in the field of refractories production and refractories export,which has devoted a lot to relative high temperature industry.     

添加物对高铬耐火材料结构与性能的影响

研究了Al2 O3和ZrO2 对水煤浆加压气化炉用高铬耐火材料结构与性能的影响。结果表明 :Al2 O3能有效提高高铬材料的致密化程度 ;适量的ZrO2 能够明显地改善高铬耐火材料的抗热震性能。颗粒与基质比较紧密的结合 ,粒状和环状(Cr,Al) 2 O3固溶体的共存 ,以及增韧相ZrO2 均匀分布的显微结构特征 ,都是高铬耐火材料具有较好综合性能的内在因素。     

耐火材料力学—热物理性能的评述

本文简述了对耐火材料机械性能及热震稳定性的已有知识及有关研究的进展。讨论了耐火材料化学成份，相组成，微观及宏观组织对其弹性常数、力学强度、断裂及热震参数等物理化学性能的影响；探讨了耐火材料现有测试评价技术中的问题和未来研究的方向。     

Development of Refractories for Continuous Casting

The paper introduces refractories for continuous casting,especially,refractories for continuous casting for clean steel in baosteel.Developing direction of refractoies for continuous casting has been pointed out to satisfy the new metallurgical operating practice.     

Corrosion of refractory materials in fluidised bed gasification of alkali rich fuels

Gasification of renewable fuels is not common practice due to the high costs of technologies and the absence of reliably working refractories. Refractory degradation is of such high significance that improved refractory durability was ranked first by industry experts in a list of 20 research and development areas related to the economic viability of gasification. Therefore, for improvement of the reliability and durability of refractory linings, this work is dealing with the corrosion resistance of nine commercial refractories to a variety of emissions from potential fuels. The refractories were exposed to a gasifier-like, water vapour and alkali rich atmosphere. Exposures with a duration of 250 h produced corrosion effects that were investigated by scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction. Furthermore, thermodynamic calculations were included to further explain the equilibrium chemistry. The results show that extremely low silica refractories are promising candidates for gasifier utilisation.     

Export and Import Situation of Refractories in China

China has been the biggest country in production and exporting of refractories. The article describes the problems in the export and import and suggestions on development of refractories. In the future, China will expand its cooperation with world refractories community in science, technology, economy and trade to play a more important role in the international and domestic markets.     

Comparative study of B4C,Mg2B2O5, and ZrB2 powder additions on the mechanical properties,oxidation, and slag corrosion resistance of MgO–C refractories

Boron-containing additives are used to improve the oxidation resistance of carbon-containing refractories; however, their effects on the mechanical properties and slag corrosion resistance of the refractories have rarely been studied. In this work, B₄C, Mg₂B₂O₅, and ZrB₂ powders were incorporated into low-carbon MgO–C refractories to study their effects on the mechanical properties, oxidation resistance, and slag corrosion resistance of the refractories. The relationships between these properties and the microstructure and phase evolution were also studied. The results show that the flexural strengths of the MgO–C refractories at high temperatures are closely related to the apparent porosity and formation of an Mg₃B₂O₆ phase. The oxidation resistances are greatly improved after the introduction of boron-containing additives into the MgO–C refractories in terms of both thermodynamical aspects and the filling of voids and pores. The most effective antioxidant is B₄C, followed by the ZrB₂ and Mg₂B₂O₅ powders. The mechanisms through which the vanadium-containing slag attacks the MgO–C refractories mainly include the dissolution of magnesia to form melting phases, penetration through pores, and redox reaction with carbon.     

金属复合Al2O3基耐火材料的研究进展

介绍了金属复合Al2O3基耐火材料的研究进展,重点介绍了金属加入物对Al2O3基耐火材料性能的影响。加入金属可提高材料的常温和高温强度、断裂韧性、抗热震性和抗侵蚀性等,从而提高了材料的使用寿命。材料性能优化的原因是加入的金属反应生成了碳化物、氮化物和SiAlON(或AlON),以及少量金属熔融后的助烧结作用。     

Refractories for the slide gates of the steel-teeming ladles of the electric melt shop of belorussian metallurgical plant

Conclusions The imported refractories and design of the slide gate were analyzed. Experience in their use, which may be used in domestic practice for increasing refractory life and improving the designs of refractories and gates and the method of teeming steel through slide gates, was obtained.At Belorussian Metallurgical Plant a set of domestic refractories has been introduced in the Interstop slide gate in place of the imported ones. The life of the domestic refractories is equal to or exceeds that of the imported analogs.Translated from Ogneupory, No. 6, pp. 51–55, June, 1989.     

Stabilized Dolomite Refractories

A technology of environment-friendly refractories based on briquetted dry-ground dolomite, magnesia-silicate raw materials, and stabilizing additives has been developed. The potential use of the newly designed refractories as an alternative to chromite-periclase refractories is emphasized.     

Testing MKB-75 mullite-corundum articles in linings of casting ladles

The West Siberian Integrated Iron-and-Steel Works has tested in 350-ton casting ladles mullite-corundum refractories of grade MKB-75 (TU 14-8-633-95) produced by the Semiluki Refractory Plant. The use of these refractories in the ladles for casting steel into molds provides an endurance of 40 heats without replacing the slag zone or the bottom, which is 1.5 times higher than the endurance of ladles lined with conventional KVKB refractories. The use of MKB-75 refractories for continuous casting is inexpedient because of the elevated specific consumption and low endurance of the refractories.     

第三届国际耐火材料学术会议评述

通过对１９９８年在北京召开的第三届国际耐火材料学术会议的评述,介绍了最近几年国内外耐火材料工业所取得的主要成就,指出了中国耐火材料工业在整体上与国外先进水平所存在的差距,提出了中国耐火材料工业在今后的发展中应注意的一些问题