盛钢桶用优质不烧铝镁炭砖的研制

盛钢桶用优质不烧铝镁炭砖的研制目前我国钢包中普遍采用的是铝镁不烧砖及铝镁炭不烧砖，尤其是铝镁炭不烧砖具有较好的抗渣能力和抗热震性，克眼了钢水和渣的渗透引起的结构剥落现象，使用寿命明显提高。但铝镁炭不烧砖具有抗氧化性较差，以及导热过快引起的钢包粘渣等缺...     

使用后铝镁炭砖的显微结构分析

对宝钢电炉盛钢桶用铝镁炭砖使用后的显微组成和结构进行了分析 ,研究了用后铝镁炭砖的相组成和显微结构变化。结果表明 ,铝镁炭砖在使用过程中组成相的烧结反应产物产生的微膨胀使制品结构进一步致密 ,尤其是越靠近工作面 ,尖晶石晶粒尺寸越大 ,最终在工作面与蚀变铝酸钙一起形成致密层 ,有效地减缓和阻止了铁水和熔渣向砖内的侵蚀与渗透。     

镁钙炭砖在LF-VD精炼炉渣线部位的试用

天津钢管公司150tLF－VD精炼炉渣线部位成功地试用了不烧镁钙炭砖,平均寿命达20炉。实现了与炉身铝镁炭砖同步,解决了几年来使用镁炭砖必须拆砌一次渣线砖的问题,大大降低了耐火材料消耗和费用,提高了精炼炉作业率。     

铝镁炭钢包衬砖抗侵蚀性的研究

对铝镁炭钢包衬砖抗侵蚀性研究结果表明：铝镁炭砖抗侵蚀、抗热震和抗结构剥落等性能优良。镁砂和石墨的质量及加入量，对铝镁炭砖的抗侵蚀性能有重要影响。     

再生铝镁炭砖的研制

铝镁炭砖主要用于钢包衬砖 ,钢包不仅是贮运钢液的高温容器 ,还是具有特定功能的钢液精炼设备。由于钢液温度提高 ,钢液在钢包内停留时间延长 ,加上精炼过程中的搅拌和炉渣的侵蚀作用 ,使钢包的使用条件恶化 ,寿命下降 ,而作为钢包衬砖的铝镁炭砖达到使用寿命时 ,便被拆除下来 ,成为“废砖”。随着政府对环保的日益重视和大力宣传 ,目前许多企业已对含碳耐火材料的回收利用重视起来。已有科学工作者对铝镁炭砖的回收利用进行了研究 ,但在中国尚处于试验阶段。本研究在试验室研制了再生铝镁炭砖 ,并与未加废砖的铝镁炭砖 (以下简称新砖 )的性…     

连铸钢包用铝镁尖晶石-炭砖的研制及应用

针对铝镁炭砖在使用过程中残余膨胀过大、热导率较高等问题，从基质组成、鳞片石墨的粒度及加入量和生产工艺等方面进行了研究试验，在铝镁炭砖基础上研制开发出了综合性能优良的铝镁尖晶石-炭砖。     

提高树脂结合铝镁炭砖性能的措施

随着钢铁生产技术的发展，钢包村砖的使用茶件日益苛刻。树脂结合铝镁炭钢包村砖性能优异，已在钢包上得到广泛应用。通过实际使用发现，钢包衬砖的损毁主要从基质开始，铝镁炭砖所具有的优异性能能否得到发挥将取决于基质的质量。因此，合理分析基质损毁机理，采取适当措施，将使铝镜炭砖的使用性能得到改善。通过实验研究，采用添加复合防氧化剂，控制基质中AZO3、MgO比例及基质料共唐三种方法可有效提高铝镁炭砖的性能cl添加复合防氧化剂为了提高含炭材料的抗氧化性，常常加入S、川、Mg、Zr、SIC、B4C和BN等添加剂。试验的铝镁炭砖…     

铝镁尖晶石钢包砖的生产及应用

新疆八一钢厂的 2 5t转炉冶炼周期短 ,钢包周转速度快 ,主要冶炼钢种有 2 0MSi、Q2 35等 ,要求钢包内衬具有如下性能 :热震稳定性优良 ;渣线部位抗渣侵蚀和渗透性能好 ;包底冲击区高温强度高 ,抗冲击性能好 ;整个内衬要抗剥落。该转炉钢包包衬原来使用的是铝镁炭砖 ,价格较高 ,使用寿命仅在 6 5次左右。为了降低成本 ,提高包衬的使用寿命 ,八一钢厂与郑州振东耐磨材料有限公司合作 ,开发出了性能优良的铝镁尖晶石钢包砖。1　研制主要原料采用山西阳泉高铝矾土熟料和辽宁大石桥中档烧结镁砂 ,其理化指标见表 1。原料颗粒的临界粒度为 8mm。…     

矾土基高铝—尖晶石质钢包浇注料的研制和应用

以特级铝矾土、矾土基尖品石和烧结镁砂等为主要原料，采用超细粉凝聚结合，并对基质的化学矿物组成进行优化，开发出了矾土基高铝—尖晶石钢包浇注料。其烘烤特性良好，施工性能、物理性能及抗渣性比传统水玻璃结合的铝镁浇注料有显著提高。经在全国十多家钢厂的中小型钢包上使用，在绝大多数情况下其寿命比传统水玻璃结合的铝镁浇注料或铝镁炭发砖提高了１００％以上。     

添加Cr2O3对不烧铝镁砖性能的影响

钢包渣线部位一般使用镁碳砖,因为该部位需要材料具有优异的抗侵蚀性。无碳碱性耐火材料如镁尖晶石砖、镁铬砖等也被用在钢包上以防止钢水增碳。但这些砖抗渣渗透性差,导致结构剥落,然而其抗渣侵蚀性好。因此,典型的无碳砖———不烧铝镁砖尽管具有优异的抗渣渗透性,但是其抗渣侵蚀性较差,不能在钢包渣线上使用。日本品川耐火材料公司的研究人员研究了添加Cr2O3对不烧铝镁砖性能的影响。试样的化学组成见表1,其中1#试样为参考样,6#试样为烧结铝镁铬砖。将配好的料在轮碾机中混练均匀,使用摩擦压砖机压制成型,成型好的坯体在200℃干燥,然后经1 500     

Post-mortem analysis of MgO–Al2O3–C bricks containing bauxite used in steel ladle walls

A serious problem with integrated masonry linings ladle was that the ladle wall bricks were difficult to be partially replaced. Thus, the service life of the ladle was determined by the properties of ladle wall bricks. In this study, the new generation of MgO–Al₂O₃–C bricks with bauxite aggregates was tested in a ladle lining of an integrated steel ladle for 103 cycles, and the corroded microstructure of the used brick was investigated. A multilayered structure of bauxite aggregates could be observed in the used brick, which inhibited the slag penetration along the boundary of the magnesia aggregates and reduced the degree of the aggregates fall off from the used bricks. Besides, during the process of slag penetration, bauxite aggregates could melt into the slag, which increased the viscosity of the slag and weakened the penetration ability of the slag. The MgO–Al₂O₃–C bricks with bauxite addition could improve the service life of the ladle to a certain extent.     

钢包粘渣与包衬耐火材料

阐明了钢包粘渣与包衬耐火材料存在一定的关系 ,抗渣渗透性差、容易出现开裂的包衬耐火材料容易粘渣。为防止钢包粘渣 ,适于采用抗侵蚀性和抗渣渗透性优良的尖晶石砖、铝尖晶石 (或铝镁 )浇注料、低密度浇注料以及抗剥落性好的刚玉 -锆英石浇注料作包衬耐火材料     

Spalling degradation of Cr2O3-Al2O3-ZrO2 refractories for coal-water slurry gasifier linings: Role of phosphate

Two kinds of high chromia bricks with and without phosphate as gasifier linings were postmortem analyzed during their whole service life. The effect of phosphate on the microstructure and phase composition of refractory sections was analyzed. The dense phosphate enrichment layer was observed between the slag penetration layer and the virgin layer, which was considered to reduce the damage of gasifier lining caused by spalling. Phosphate could decompose and migrate slowly under suitable temperature gradient existing in the bricks in service, which would result in the densification of the microstructure earlier than slag penetration. The phosphate in high chromia bricks reduced frequency of spalling due to penetration, which would lead to the lower early wear rate and longer lifetime.     

镁钙砖的抗渣性研究

采用静态坩埚法研究了3种不锈钢冶炼用镁钙砖的抗渣性.结果显示:镁钙材料具有良好的抗高碱度渣侵蚀和渗透能力,高温下渣和镁钙材料作用析出高熔点相C3S,使材料表层致密化而有效抑制渣的渗透,但镁钙材料中的CaO含量对抗侵蚀性影响较小;较低碱度渣对镁钙材料具有较强的侵蚀和渗透能力,主要是因为渣液对基质的强溶蚀和渗透作用.     

锆英石对铝铬锆砖抗侵蚀性能及六价铬形成的影响

铝铬锆砖因具有优异的抗渣侵蚀性能,被作为炉衬材料广泛应用于工作环境恶劣的危废焚烧炉。然而,铝铬锆砖在制备和服役过程中可能形成有毒的水溶性Cr(VI),相关研究工作却未见报道。本研究分别以单斜氧化锆和锆英石为氧化锆源制备了两种铝铬锆砖,研究了铝铬锆砖在四种不同组成危废焚烧炉渣中的侵蚀行为及熔渣侵蚀前后砖中Cr(VI)的含量。结果表明,锆英石高温下分解形成单斜氧化锆和无定形的二氧化硅,促进化学稳定性较好的(Al,Cr)₂O₃固溶体的形成,提高了铝铬锆砖的致密化程度,同时改善了铝铬锆砖的抗渣侵蚀性能。此外,生成的二氧化硅可以还原砖中Cr(VI)化合物,降低铝铬锆砖中的Cr(VI)含量。熔渣侵蚀后,铝铬锆砖渗透层中Cr(VI)含量与熔渣成分密切相关。在被高碱性氧化物含量的熔渣侵蚀后,铝铬锆砖渗透层中的Cr(VI)含量较高,但锆英石作为氧化锆源的铝铬锆砖在不同熔渣中侵蚀前后的原砖层和渗透层内的Cr(VI)含量均低于欧盟限制标准。     

Slag Resistance of Refractories for Direct Reduction of Laterite Nickel Ores in Rotary Kilns

Aiming at prolonging the service life of refractories for direct reduction of laterite nickel ores in rotary kilns, the slag resistance of ten materials(corundum bricks, chrome corundum bricks, silicon nitride bonded silicon carbide bricks, high alumina silicon carbide bricks, high alumina bricks, magnesia chrome bricks, magnesium aluminate spinel bricks, spinel chrome corundum bricks, chrome corundum castables and magnesia alumina chrome composite spinel bricks) was evaluated by rotary slag tests, which simulate the service conditions in rotary kilns. The corroded residual bricks were analyzed by SEM and EDS. The results show that the magnesia alumina chrome composite spinel brick possesses the advantages of magnesium aluminate spinel bricks and chrome corundum bricks; MgO-rich spinel can absorb the penetrated ferric oxide, and forms a dense zeylanite layer, which prevents the penetration of the molten laterite nickel ores; therefore, it is an ideal lining of rotary kilns for direct reduction of laterite nickel ores.     

Influence Parameters on Properties of Dolomite Bricks Containing Different Bonding Systems

Pitch and tar bonded dolomite bricks are extensively used in ladles and converters for long time because of their superior properties such as. steel melt refining, easy production as well as low production cost. Recently, resin bonded dolomite bricks are presented for using in steel plants. Generally, quality and final cost of steels are affected by properties of refractories especially dolomite bricks. Therefore, recognition of influence parameters on dolomite refractory properties is very important. In this study, the effects of tar and resin as bonding systems, and addition of graphite （ 2wt% ） on the properties of dolomite refractory bricks have been investigated. Properties such as ： density and porosity, cold crushing strength, hydration time and depth of slag penetration have been studied. Results show that the bonding sys- tems and graphite have a great effect on the mentioned properties especially cold crushing strength and hydra- tion time. In addition to their low rate of pollution, resin bonded dolomite bricks show higher performance with proper technical specifications.     

AOD炉渣对MgO-C砖的侵蚀机理研究

不锈钢生产主要采用氩氧精炼(AOD)炉冶炼工艺,本文探究AOD炉渣对钢包内衬用MgO-C砖的侵蚀机理,为提高钢包内衬用MgO-C砖的使用性能和服役寿命提供理论支撑。结合FactSage6.2软件、X射线衍射(XRD)、场发射扫描电子显微镜(SEM)和能量色散光谱(EDS)等测试手段分析炉渣侵蚀后MgO-C砖的物相变化、显微结构和化学成分变化。结果表明,随着侵蚀反应的进行,方镁石逐渐被熔蚀,且逐步出现Ca₃MgSi₂O₈等低熔点物相,以及MgAl₂O₄等高熔点物相。AOD炉渣通过基质部分侵蚀渗透MgO-C砖,并与方镁石反应生成Ca₃MgSi₂O₈等低熔点物相,熔蚀方镁石;同时,方镁石边界处生成MgAl₂O₄,阻碍AOD炉渣对MgO-C砖的侵蚀渗透。     

炼铜诺兰达炉用镁铬砖损毁机理的探讨

简要介绍了诺兰达炉用耐火材料的现状,并以风口区使用后的镁铬残砖为试样,采用化学分析、SEM和EDAX等手段对其侵蚀机理进行了分析研究。结果表明:铜渣对镁铬耐火材料的侵蚀,在工作面以熔蚀为主;在砖体内部主要以锍渗透为主。锍渗透的主要途径为开口气孔、晶界及微裂纹。     

Slag erosion-resistant coating for periclase-magnesia-aluminum spinel brick

The magnesia-carbon bricks are used at the ladle slag line adds carbon to molten steel and thus has an adverse effect on the smelting process. Steel production enterprises hope to remove carbon from the ladle slag line. This study presents a Silica sol (SS)–magnesium aluminate spinel(MA) coating that can be applied to the surfaces of periclase–MA spinel brick (spinel brick) to improve their slag erosion resistance, facilitating the elimination of carbon from the ladle slag line. The slag corrosion resistance mechanism of a spinel brick covered with the SS–MA coating was analyzed through scanning electron microscopy and simulation using FactSage software. The results show that increasing the SS content (C_SS) led to the formation of fine cracks during the coating-drying process and was detrimental to the slag erosion resistance of the coating. The optimum C_SS was 20%. In the high-temperature slag erosion experiment, the MA in the coating was capable of forming solid solutions with Fe and Mn in the slag, and the nano-SiO₂ in the coating interacted with the slag, increasing the viscosity of the slag and reducing its penetration. In addition, the presence of the coating extended the penetration path of the slag and reduced the contact area between the slag and the spinel brick and their chances to undergo chemical reactions, thereby protecting the spinel brick from slag erosion. The coated spinel bricks outperformed the magnesia-carbon brick in terms of slag erosion resistance, providing a basis for selecting carbon-free refractory materials for the ladle slag line.