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。     

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...     

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…     

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…     

渣对铝镁炭砖的侵蚀与渗透

对电炉连铸钢包用后铝镁炭砖进行了ＳＥＭ和ＥＰＭＡ观测分析。探讨了渣对铝镁炭砖的侵蚀与渗透机理，并提出了抑制渣渗透的措施。     

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。     

连铸钢包用铝镁炭砖的研制与应用

连铸钢包用铝镁炭砖的研制与应用目前我国钢包寿命普遍较低，钢包修补频繁，工人劳动强度明显增加，严重制约了连铸的发展。在这种形势下，冶金部建筑研究总院认真研究了连铸钢包的使用条件，开发了铝镁炭砖，在连铸钢包上使用，取得了理想的效果。为了能够抵抗高温钢水和...     

镁铝炭砖和铝镁炭砖在连铸包衬上的应用

用镁铝炭砖和铝镁炭砖综合砌筑连铸包衬，使用寿命由５３次（高铝砖衬）提高到１０１次，耐火材料单耗由４．３８ｋｇ／ｔ钢降低到２．３ｋｇ／ｔ钢。     

钢包工作衬用无炭预制块的研制与应用

炼钢厂现有的Al2 O3 -MgO -C质钢包工作衬的使用寿命仅为6 5次左右,另外因其含碳量较高,精炼结束后导致钢水中增碳,钢水炼成率低。因此,如何提高钢包工作衬的使用寿命,是保障炼钢工艺顺利实施的关键因素。1　无炭预制块的研制与应用以电熔刚玉、电熔镁砂、氧化铝微粉、尖晶石微粉等为主要原料,加入其他外加剂,采用水化结合振动成型成预制块。自然养护2 4h后,采用低温(30 0～35 0℃)烘烤。研制的无炭预制块和铝镁炭砖的物理性能对比见表1。表1　预制块和原用铝镁炭砖的物理性能对比项　　　目铝镁炭砖预制块显气孔率/%10 0 0℃3h 18.0 17.2…     

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。     

Chemical corrosion mechanisms of magnesia–chromite and chrome-free refractory bricks by copper metal and anode slag

The penetration and corrosion resistance to copper and anode slag of six magnesia–chromite and six chrome-free refractory brick types were tested using static finger tests at a typical copper-refining temperature (1300 °C). The microstructures of the as-delivered and tested refractory types were investigated by means of electron-probe micro-analysis (EPMA) and scanning electron microscopy (SEM) techniques. The results showed that the overall wear rate of the fingers was very low, with the exception of the alumina-based brick made of fused corundum and magnesia–alumina spinel, and the magnesia-based brick made of sintered magnesia and zircon addition. In all refractory types new phases were formed as a result of slag-refractory interactions. Apart from the samples recovered from the copper zone of the latest generation of direct-bonded magnesia–chromite bricks, all the rest were completely infiltrated by copper and slag components (copper oxide, iron oxide, alumina and silica). However, the amount of infiltrated liquid in the chrome-free types was higher than in the magnesia–chromite bricks. Explanations are provided for the distinct infiltration behaviour. The results show that economically viable chrome-free refractory alternatives are still elusive for anode furnace linings.     

氧化铝微粉加入量对低碳镁碳砖性能的影响

以电熔镁砂、石墨、金属Al和氧化铝微粉为主要原料,热塑性酚醛树脂为结合剂,制备了w(C)5%的低碳镁碳砖试样,研究了氧化铝微粉加入量(其质量分数分别为0、3%、5%、7%、9%)对低碳镁碳砖的常温物理性能、抗热震性和抗氧化性的影响。结果表明:(1)随着氧化铝微粉加入量的增加,低碳镁碳砖试样的体积密度、常温强度和高温强度均先升高后降低,显气孔率则先降低后升高;抗热震性和抗氧化性随微粉加入量的增加呈先改善后变差的趋势;其中,微粉加入量为5%的低碳镁碳试样综合性能最好。(2)低碳镁碳砖试样性能的改善主要是由于加入的氧化铝微粉和MgO在高温下原位反应生成连续分布的尖晶石,增强了基质的陶瓷结合;但氧化铝微粉加入量过大时,由于大量原位反应引起材料产生过大的体积膨胀,会导致基质结构疏松,从而恶化镁碳砖的性能。     

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.     

Technology of Spinel-Bonded Periclase Brick

This study covers the development of a new basic brick with outstanding resistance to load deformation, slagging, and spalling. This brick is made of 92% high-purity periclase and 8% high-purity alumina. During firing for a ceramically bonded brick or in service for a chemically bonded brick, the fine periclase and alumina react to form a spinel (MgO.Al₂O₃) bond. As the magnesia content of the periclase is increased, the properties of this brick become more outstanding.     

氧化锆对碱性耐火材料使用性能的影响

在高纯镁砂中引入适量ＺｒＯ２制取的ＡＯＤ炉用风眼砖，可显著提高制品的机热震性和抗侵蚀性能。     

水泥工业用无铬碱性砖的发展情况

消除铬公害和在水泥窑内应用代用燃料促使白云石砖、尖晶石砖和镁锆砖组成的系列无铬碱性砖成功地替代着镁铬砖。当前无铬碱性砖还在不断开发和更新之中。     

Innovative Lining of Unburnt Al_2O_3-MgO Brick for 300t Steel Ladle in Baosteel

The manufacture of clean steel needs high performance carbon-free bricks for ladle lining.Based on long term application experiences of the prefab Al₂O₃-MgO blocks,unburnt Al₂O₃-MgO brick has been developed by pressing a mix of alumina,spinel and magnesia as major raw materials and Al₂O₃-MgO gel powder as binder.In addition to low open porosity and high strength,the unburnt Al₂O₃-MgO brick shows superior corrosion resistance and thermal shock resistance to the prefab block.Field trials in a 300t steel ladle have indicated the residual lining of unburnt Al₂O₃-MgO bricks showed smooth surface without large spalling and seldom steel infiltration,consequently longer service life than the prefab blocks.The reliable,unburnt Al₂O₃-MgO bricks have more advantages of high efficiency,energy-saving and eco-friendly production.It will be one of the best options for ladle lining in the manufacture of high-purity steel.     

Corrosion Resistance Mechanism of Magnesia Zirconia Brick to RH Furnace Slag

Magnesia zirconia brick containing 11 wt% zirconia was prepared with magnesia and monoclinic zirconia as starting materials in order to replace the chrome-containing materials for RH furnace.The corrosion resistance of magnesia zirconia brick and fused rebonded magnesia chrome brick (short for magnesia chrome brick) to high and low basicity slag of RH furnace was comparatively researched by rotary slag method and their slag resistance mechanisms were analyzed.The results show that:(1) because the reaction l...     

Effects of high concentrations of liquid phase and magnesia on the grain growth of alumina

Grain growth phenomenon of alumina in the presence of various quantities of liquid phase and magnesia was investigated at 1600°C, and the data were regressed by a statistical approach. The statistical result indicated that liquid phase, compared with magnesia, was a major factor in determining the grain growth mechanism of alumina. The alumina phase developed into faceted grains when the liquid phase was so abundant as to penetrate all the grain boundaries and junctions of alumina, whether with the doping of magnesia or not. This observation implied that magnesia, when co-existing with a large quantity of liquid phase, did not effectively reduce the degree of anisotropy in interfacial energy of alumina. Nevertheless, when its concentration was high enough to result in the precipitation of MgAl₂O₄, it avoided the evolution of elongated alumina grains by pinning the fast moving boundaries.     

锆英石对镁砂烧结性及其制品性能的影响

探讨了锆英石对镁砂烧结性能的影响 ,并研究了由这种合成镁锆砂制成的镁砖的性能。结果表明 :锆英石能显著提高镁砂的烧结性能 ;利用合成镁锆砂制成的镁砖以高熔点的第二固相为结合相 ,性能明显优于普通镁砖