水泥回转窑用耐火材料

日本水泥工业界，伴随行业重线正掀起一场以实现降低耐火材料单耗，提高回转窑使用寿命为目标的声势浩大的合理化改革高潮，窑内产生的工业废品以及窑衬砖的工作环境正日益苛刻，在这样的形势下，我们竭力开发适应窑炉操作条件需要的耐火材料。本产品应用于回转窑上的稳定的使用寿命已遍及日本，我们的高质量产品，已经赢得了良好信誉。     

水泥回转窑用镁尖晶石耐火材料

本文论述了第二代镁尖晶石耐火材料的研制成果。查明，利用水镁石可以生产出优质合成尖晶石和方镁石。含有这些组份的新研制的镁尖晶石耐火材料的物理陶瓷性能指标优超于目前俄罗斯在回转窑中所采用的镁铬质耐火材料的同类指标。     

水泥回转窑用耐火材料的设计

衬料设计是村料工作中的重要的一环，村料设计必须做好下述几点：合理地选用材质；合理地配置砖型；村体的牢固性；合理地降低辐射热损失；可满足部分设备的衬体特殊要求等。1合理地选用材质材料的选用必须合理，品种过多，给生产制造、储备、管理、施工均带来不便；而品种太少     

MgO-CaO-ZrO2耐火材料的性能、制备与应用

系统地介绍了MgO-CaO-ZrO2耐火材料的性能特点、应用领域、制备与使用情况.指出,利用高纯原料制备MgO-CaO-ZrO2耐火材料已取得成功,而利用天然原料低成本地制备MgO-CaO-ZrO2耐火材料将成为今后研究的主要课题;同时指出,MgO-CaO-ZrO2耐火材料的剥落现象是影响其使用寿命的主要原因,还有待于进一步研究改进.     

水泥回转窑烧成带用无铬耐火材料

根据水泥回转窑烧成带对耐火材料的要求,从有关相图分析论述了MgO-CaO-ZrO2材料抗硅酸盐水泥的侵蚀;由Fe-O系相图与铁的各级氧化物稳定存在区域图分析了形成铁铝尖晶石(FeO.Al2O3)的条件及制取铁铝尖晶石砖的途径。     

水泥回转窑及其耐火材料内衬

在对回转窑及其工艺进行描述后，讨论了一次及二次燃料的作用，随后解释了与烧结带用砖有关的一些问题，最后考察了不同的磨损和内衬情况。     

水泥回转窑用耐火材料的评价技术

水泥回转窑是转动窑,所用耐火材料要求的功能涉及到很多方面,对其耐火材料的评价技术要符合实情。本文即是按实际情况评价的。     

传统水泥回转窑用耐火材料的配套设计原则

众所周知,我国传统的水泥回转窑在大中型厂内主要是指湿法长窑、湿法短窑、立波尔窑和干法短窑。要想保证窑的正常运转,并提高其运转周期,正确、合理地选配回转窑用耐火材料至关重要。水泥窑衬的寿命还部分地取决于耐火材料的质量,筑炉技术水平的高低和生产的组成、燃料的性质及窑的操作。笔者在此着重谈谈回转窑用耐火材料的选配原则。     

水泥窑用无铬碱性耐火材料

水泥窑体耐火材料直接影响着窑体的使用寿命,对水泥窑"均衡稳定"生产至关重要。随着我国水泥工业飞速发展,水泥窑用耐火材料技术水平也显著提升,为水泥窑正常生产提供有力技术保障。镁铬砖是一种传统水泥窑用耐火材料,镁铬尖晶石的形成对提高耐火材料耐高温性能、抗热震性、抗侵蚀性和挂窑皮性具有重要     

Enhanced alkali vapor attack resistance of bauxite-SiC refractories for the working lining of cement rotary kilns via incorporation of andalusite

Bauxite-SiC refractories as the working lining of cement rotary kiln are subjected to severe alkali attack due to alternative fuel combustion. Herein, the present work aims to enhance their alkali attack resistance via incorporation of different types of andalusite (aggregates and powder). Results show that addition of andalusite reduces penetration of alkali vapor by decreasing their pore size. In particular, the presence of andalusite aggregate traps alkali vapor inside its pore network, retarding the corrosion of refractory matrix. By comparison, the presence of andalusite powder contributes to formation of liquid corrosion products to block the pores, which prevent alkali vapor from further penetration. Incorporation of andalusite into BSRs is straightforward and sought-after, providing an effective approach for high-performance refractory materials with excellent alkali attack resistance.     

高温回转窑的热工设计与实践

煅烧温度在１７００℃以上的高温回转窑是生产合成耐火原料的主要装置之一。回转窑要实现高温煅烧,必须具备五个条件：１）承受高温的能力;２）必须有好的燃料;３）一次风要预热到２５０～３５０℃;４）二次风温控制在６００℃以上;５）入窑料要预热到４００℃左右。这样才能生产出优质的合成耐火原料。     

水泥回转窑烧成带用耐火材料的最新研究

对水泥回转窑烧成带用耐火材料的使用条件和要求进行了分析,并对近年来水泥窑用镁铬砖、镁尖晶石砖、镁钙锆砖的应用进行了探讨,指出所存在的缺点及改进措施。认为其发展方向为镁钙锆砖及尖晶石砖,并对其应用前景进行了展望,希望实现水泥回转窑的无铬化。     

ZrO2—Containing Refractories for Cement Rotary Kilns

ZrO2-Containing Refractories have been increasingly used for cement rotary kilns,This paper discusses how the properties and performance of ZrO2-Containing Refractories are improved in terms of chemical attack resistance,thermal shock resistance,thermal conductivity and mechanical stress.     

Periclase-spinel refractories for rotary cement kilns

Results of an investigation aimed at the development of periclase-spinel refractories of the second generation are described. It is established that brucites can be a basis for the production of high-quality artificial spinel and periclase. The periclase-spinel refractory with these components has higher physical and ceramic properties than the periclase-chromite refractories used today in Russia for linings of rotary kilns.Translated from Ogneupory, No. 2, pp. 18 – 20, February, 1996.     

水泥窑烧成带用镁铁铝尖晶石砖的研制

为了满足水泥窑烧成带用砖无铬化的要求, 以粒度3.5～1mm、<1mm、<0.088mm的高铁镁 砂和粒度<2mm的铁铝尖晶石为原料,分别讨论了 1500℃、1550℃、1600℃、1650℃的烧成温度和 5%、7%、9%、11%的铁铝尖晶石加入量对镁铁铝尖 晶石砖性能的影响。结果表明:当烧成温度为1600 ℃时,试样已烧结;当铁铝尖晶石加入量为7%时,试 样的耐压强度与粘结强度最高(用粘结强度表征材 料的挂窑皮性)。与直接结合镁铬砖相比,镁铁铝尖 晶石砖在热震稳定性方面更优于直接结合镁铬砖,而 在粘挂窑皮性能方面与其相近。     

Lightweight design of bauxite-SiC composite refractories as the lining of rotary cement kiln using alternative fuels

To meet the demand of energy-saving and adapt to the change from coal to the alternative fuel in the rotary cement kiln, bauxite-SiC refractories were fabricated by the incorporation of silica sol coated lightweight mullite aggregates in order to achieve low thermal conductivity and superior alkali vapor attack resistance simultaneously. Furthermore, the mechanism of resistance to alkali vapor attach was investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results showed that the thermal conductivity of bauxite-SiC specimens decreased gradually with increasing amounts of silica sol coated lightweight mullite aggregates while changes in the alkali vapor attach were not detectable. The shell-covered structure with a silica sol coating on the surface of lightweight aggregates hindered alkali vapor diffusion into the aggregates at high temperature. Bauxite-SiC refractories possessed lower thermal conductivity, superior alkali attack resistance and higher mechanical properties compared with the specimens which contained pristine lightweight aggregates.     

国产耐火材料在新型干法水泥窑上的使用

介绍了新型干法水泥回转窑用内衬材质的选择原则、施工时应注意的事项及使用过程中所取得的一些经验体会。认为按实际情况不断调整生产工艺、强化工艺管理是回转窑耐火材料使用寿命明显提高的主要措施