前脸墙鼻部烧结锆莫来石砖的侵蚀

针对前脸墙鼻部烧结锆莫来石砖侵蚀物结石中常常只看到铝硅质晶相而被误判,详细介绍了烧结锆莫来石砖的蚀变过程及侵蚀产物的岩相分析.     

山东君道高温材料有限公司

正一、刚玉、刚玉莫来石砖系列:莫来石砖(MUSB-70),高纯再结合电熔莫来石砖(MUSB-75),高性能莫来石砖(MUSB-77.7),莫来石刚玉砖(MUCO-80),莫来石刚玉砖(MUCO-85),高致密刚玉砖(COHD-95),烧结刚玉砖(COSB-95),高纯低硅刚玉砖(COHP-99)二、高纯镁铝尖晶石砖、高纯镁砖、镁锆砖系列:高纯镁铝尖晶石砖(MAS-70)主要用于全氧重碱窑大碹,胸墙,玻璃熔窑蓄热室格子体中上部,具有天然的抗碱性。高纯镁铝尖晶石刚玉砖(MAS-80),含锆镁铝尖晶石砖(MAS-68.8),镁锆砖(AMZ-76),高纯镁砖(SMA-96),高纯镁砖(SMA-98),高纯镁砖(SMA-99)     

L型吊墙带来的缺陷

介绍了L型吊墙使用的耐火材料及工作环境。重点阐述了鼻区下沿烧结锆莫来石砖的结构和侵蚀机理,以及由L型吊墙带来的各种缺陷。     

玻璃熔窑耐火材料配套使用的现状与前景

(一)概述 近10年内我国玻璃熔窑耐火材料发展迅速,作为熔窑主体材料的含ZrO_2 33％电熔锆刚玉砖,近五年内产量翻了二番,质量亦有所提高;电熔砖新品种如含ZrO_2 36％锆刚玉砖已批量试产,氧化熔制的α-β刚玉砖已试制成功,含ZrO_2 41％锆刚玉砖正在突破中。新电熔浇注工艺的产品如池壁倾斜浇注大砖、密实浇注大砖均已投入生产。优质烧结材料如锆英石砖、含ZrO_2 8％、20％、30％的锆莫来石砖、锆英石散状料等品种,均处于试用阶段。硅砖的质量亦已引起重视。上述材料的发展与应用,为玻璃工业提高生产效益与节能提供良好的     

流液洞的结构和冷却方式探讨

流液洞是玻璃池炉设计中重要结构之一,由于它的截面积较小,玻璃液通过时,流速大,温度高,因此在高速和高温的条件下,玻璃液对流液洞侵蚀作用严重。故需要选择优质耐火材料砌筑流液洞,并且采用冷却以延长其寿命。从流液洞的损坏来看,流液洞的盖板砖侵蚀程度比两侧墙为严重,入口处侵蚀又比出口处为严重。因此选择耐火材料时,入口处的盖板砖应选用锆刚玉砖,出口处的盖板砖如果条件许可,一般选择锆莫来石砖或锆刚玉砖。流液     

日本旭玻璃公司电熔耐火材料生产和验收标准简介

一、前言自二十年代电熔莫来石砖问世,很快就取代了烧结砖,被欧美和日本等国广泛采用,使窑炉寿命有所延长。四十年代研制成功电熔锆刚玉砖以后,窑炉寿命又有新的突破。开始是用还原法生产,砖体内含碳量和玻璃相都较高,玻璃相析出温度较低,约在1250℃左右,砖体呈深灰色,俗称黑铁砖。     

低导热多层复合莫来石砖在5 000 t/d生产线上的应用

介绍了低导热多层复合莫来石砖的结构、技术性能及砌筑原则，总结了窑内固相反应带与分解带使用低导热多层复合莫来石砖的效果，使用效果表明预分解窑使用低导热多层复合莫来石砖有利于水泥企业实现降本节能增效。     

山东君道高温材料有限公司

正高性能莫来石砖广泛应用于玻璃纤维全氧窑大碹部位,在中玻威海全保温特种浮法玻璃窑炉12.7米大碹上使用效果良好。低蠕变铝镁尖晶石砖具有天然的抗碱性,是全氧重碱窑炉大碹理想选材,长期使用温度可达1700℃。等静压成型铬锆刚玉砖-60是用于保温纤维玻璃池炉以及玄武岩玻璃池炉中侵蚀非常严重的部位:熔化池的池壁、铺底材料、流液洞和加料口等部位。等静压成型铬锆刚玉砖-30适应于保温纤维玻璃池炉的与玻璃接触的部位,对于该种类型的玻璃,它抵抗侵蚀性能优于电熔AZS     

巩义市金荣耐火材料有限公司

正公司占地50余亩,建筑面积10000多m~2,四栋现代化钢构车间内拥有40m~3超高温(1750℃)梭式窑四座,大吨位数控压力机10余台。主要生产氧化铝空心球砖、刚玉砖、锆英石砖、锆刚玉砖、莫来石砖、硅线石砖、碳化硅砖、低气孔砖、三低砖、高铝砖等高、中档耐火制品及散装耐火材料,广泛用于冶金、化工、玻璃、陶瓷、熔块、电力、铝合金、垃圾焚烧、耐火     

巩义市金荣耐火材料有限公司

正公司占地50余亩,建筑面积10000多m~2,四栋现代化钢构车间内拥有40m~3超高温(1750℃)梭式窑四座,大吨位数控压力机10余台。主要生产氧化铝空心球砖、刚玉砖、锆英石砖、锆刚玉砖、莫来石砖、硅线石砖、碳化硅砖、低气孔砖、三低砖、高铝砖等高、中档耐火制品及散装耐火材料,广泛用于冶金、化工、玻璃、陶瓷、熔块、电力、铝合金、垃圾焚烧、耐火     

凝胶法片状莫来石粉的制备及应用

采用拟薄水铝石和非晶态超细SiO_2微粉为原料。以溶胶-凝胶工艺制取莫来石凝胶,通过干燥、煅烧研制得片状结晶莫来石粉。初步研究了凝胶法莫来石粉在钛酸铝陶瓷和烧结刚玉砖中的应用。实验结果表明:凝胶粉起到了促进烧结、降低烧成温度的作用,并使钛酸铝——莫来石复相陶瓷和刚玉砖的强度得到了显著提高。     

水泥窑用特种硅莫砖的研制及应用

以高铝矾土熟料、90碳化硅、棕刚玉为主要原料,添加红柱石粉、广西白泥等外加剂,通过合理的颗粒级配,采用高压成型、高温烧成等方法,制备出水泥窑用特种硅莫砖,并研究了烧成后试样的体积密度、气孔率、强度、微观结构和耐磨性.结果表明:添加6％红柱石粉在1420℃制备的硅莫砖的性能最优,其体积密度为2.74 g/cm3,抗热震性30次,磨损量为1.06 cm3,热导率为1.65 W/(m·K),耐压强度高达159 MPa,在5000 t/d水泥回转窑过渡带上使用该产品,寿命可达一年以上,这是由于窑简体外表面温度比使用镁尖晶石砖平均降低80℃以上,极为有效地延长了该砖衬的使用寿命.     

莫来石-磷酸锆复相陶瓷材料性能的研究

本文研究了在莫来石中添加低膨胀第二相磷酸锫的莫来石-磷酸锆复相陶瓷的性能,找到了在保证强度的同时,获得较低热膨胀系数的莫来石-磷酸锆复相陶瓷的制备方法.实验表明：莫来石-磷酸锆复相陶瓷能通过将莫来石粉料与磷酸锆粉料或莫来石粉料与磷酸锆生料粉按不同质量比混合烧结制备;加入1wt％的MgO作为烧结助剂,在1350℃烧成的样品具有最低的热膨胀系数和较小的吸水率.     

硅线石砖的研制与生产

以硅线石、红柱石和烧结莫来石为主要原料，加入部分超微粉和结合剂，采用高压或震动加压成型，以合理的烧成温度，可以生产出低气孔率、高强度、抗热震稳定性良好的高炉硅线石砖。     

工艺制备对钙长石/莫来石复合材料力学性能的影响

利用钙长石和自制莫来石晶须为主要原料,通过固相法制备莫来石/钙长石复合材料。研究了工艺制备方法对钙长石/莫来石复合材料性能的影响。实验结果表明:合适的保温点(1000℃,保温1h)在1400℃烧结对复合材料的力学性能有至关重要的影响,二次重烧结法比一次烧成所制备的复合材料力学性能有所提高。XRD和SEM分析表明:由于钙长石相和莫来石相通过玻璃相紧密结合,提高了材料的力学性能。     

Transmission Electron Microscopy and Electron Energy-Loss Spectroscopy Characterization of Glass Phase in Sol-Gel-Derived Mullite

Sol-gel-derived mullite ceramics were processed by pressureless sintering at 1600°, 1650°, and 1700°C for 4 h. Microstructural and microchemical characterization of the mullite materials was performed using transmission electron microscopy, in conjunction with energy-dispersive X-ray spectroscopy and electron energy-loss spectroscopy (EELS). Apart from mullite grain diameter and triplepocket size, no major microstructural changes were observed with increasing sintering temperature. Residual glass was present at triple pockets and along two-grain junctions. Not all grain boundaries revealed the presence of a continuous amorphous intergranular film. Clean interfaces were observed only at boundaries with one grain parallel to the [001] orientation (low-energy configuration). Quantitative EELS analysis of mullite grains and glass pockets revealed only small changes in composition with increasing sintering temperature; i.e., the alumina:silica ratio slightly increased for mullite and glass. The analysis implied that mullite with this relatively high aluminum content would not be stable adjacent to residual glass. However, a stable glass-mullite system has been proposed, because impurity cations were detected within glass pockets, which suggested a slight shift of the subsolidus line (glass-mullite/ mullite) to a higher amount of alumina. Energy-loss nearedge structure studies of the Si- L _2,3 edge revealed a similar near-edge structure for the mullite, residual glass, and quartz. Thus, SiO₄ tetrahedra were thought to be the main building units of the glass contained in sintered mullite.     

Crystallization pathways in glass-ceramics by sintering cathode ray tube (CRT) glass with kaolin-based precursors

The crystallization mechanisms for the formation of glass-ceramics by sintering CRT glass with kaolin-based precursors were investigated by quantitatively determining the crystalline and amorphous phases in the products. Amorphization of sintered products was observed in CRT/kaolinite and CRT/mullite glass-ceramics systems at 700–900?°C. With the increase of temperature, the crystallochemical formation of lead feldspar and orthoclase was detected. Orthoclase was found to be the major crystalline phase in both CRT/kaolinite and CRT/mullite systems at 1000–1100?°C. When the temperature increased to 1000–1100?°C, lead feldspar was formed as the only crystalline phase to host Pb. The leaching tests suggested that the glass-ceramic product sintered by CRT/kaolin-based precursors has stronger resistance against acid attack because of the incorporation of lead into lead feldspar crystal protected by glass matrix. The incorporation of CRT glass into glass-ceramics provides a promising strategy for reducing the environmental hazard of CRT glass.     

A STUDY OF AN ALUMINA-SILICA CHECKER BRICK FROM THE REGENERATOR OF A GLASS TANK *

At the end of a campaign, alumina-silica checker brick in glass-tank regenerators occasionally are found to have undergone partial destruction as a result of the separation of an altered surface layer of the brick from the less affected core. In an investigation of such an occurrence, it was found that the outer layer had largely been converted to nephelite by reaction of soda vapors and dust from the glass batch with mullite and corundum in the brick. Thermal expansion determinations showed that the rate of reversible thermal expansion in the altered layer was almost twice as great as that of the unaltered brick. It is concluded that the separation or slabbing of the altered layer was due in part to this difference in thermal expansion and in part to a permanent expansion of the slabbed layer which occurred apparently when portions of the brick substance were converted to nephelite.