玻璃熔窑池壁侵蚀机理的研究(一)

运用X射线荧光光谱分析、扫描电镜分析(SEM)对池壁各取样点处侵蚀前后的耐火材料试样进行化学组分分析和显微结构观察,研究玻璃窑池壁的侵蚀机理以及各特征点处的差异.     

光伏玻璃窑炉池壁砖侵蚀与热态维修

玻璃窑炉池壁砖的侵蚀程度,直接影响到玻璃窑炉的寿命。论述了玻璃窑炉池壁砖的侵蚀机理与原因、池壁侵蚀的缓解和池壁砖在热态状态下的维修。     

玻璃窑炉池壁侵蚀的控制和热修

玻璃窑炉池壁是窑炉的重要组成部分,影响窑炉寿命,本文主要论述池壁砖的侵蚀机理、池壁侵蚀的控制和池壁砖的热修。     

利用池壁水包保护池壁砖减少侵蚀方案

针对池壁砖玻璃液、配合料侵蚀问题,通过在池壁内侧插水包使得在受侵蚀池壁砖部位形成一层凉玻璃不动层,能够起到很好保护池壁砖免受侵蚀的作用,而且有利于减少锆质夹杂.     

浮法窑炉池壁侵蚀机理及延缓侵蚀措施

池壁是窑炉关键设备,分析了侵蚀机理,论述了优化延长池壁使用时间的措施。     

我厂延长熔窑池壁使用寿命的几项措施

分析了造成池壁侵蚀的主要原因，提出延长池壁寿命的几项措施，如减少液面波动，降低玻璃液面，加强对池壁的冷却，用冷却水包加固池壁等。指出只要措施得力，池壁寿命可延长１￣２年。     

全氧燃烧窑炉池壁砖新型热修技术探讨

在全氧燃烧窑炉中，由于全氧燃烧的特点，反应物中水蒸气浓度达到60%以上，导致池壁砖的侵蚀速度加快，直接影响窑炉使用寿命。减缓池壁砖的侵蚀速度、延长窑炉使用寿命成为玻璃生产中的重中之重。通过分析池壁砖的侵蚀机理，在热态维修过程中采取新方式和相应的工艺调整，延长了窑炉寿命，确保窑炉的安全运行。     

超白玻璃液对熔窑池壁砖的侵蚀特性

分析了超白玻璃液的流动特性,并就超白玻璃液对熔窑池壁砖的侵蚀特性,结合实例与普通玻璃进行了对比,指出超白玻璃液对熔窑池壁的侵蚀加剧。对超白玻璃熔窑耐火材料的选择提出建议,超白玻璃熔窑池壁耐火材料应具有玻璃相含量少、气孔率低和膨胀小的特点。     

如何避免烤窑期间AZS池壁砖炸裂

如何避免烤窑期间ＡＺＳ池壁砖炸裂赵海山中国耀华玻璃集团公司设备能源处（０６６０１３）在目前所砌筑的玻璃窑炉中，单层池壁砖（通常为１．２ｍ长）因没有横缝而受侵蚀少，寿命长，砌筑又方便，被逐渐用来取代多层池壁砖。但在烤窑过程中如不注意，不采取一些措施，则...     

浅谈玻璃熔窑池壁冷却的几种方式

介绍了玻璃熔窑池壁冷却的几种方式,阐述了熔窑池壁冷却系统对玻璃生产的重要性,通过比较国内外熔窑池壁冷却系统的不同方式和存在的问题,为解决池壁砖侵蚀问题提供参考建议。     

船用锅炉衬用铝硅质耐火纤维的失效机理分析

采用SEM、XRD分析和激光粒度分析(LMS)等手段对船用锅炉炉衬用后的硅酸铝质耐火纤维的失效模式和失效机理进行了研究分析。结果表明:硅酸铝质耐火纤维在高温下析出莫来石晶体导致纤维材料的粉化,耐火涂层和耐火纤维毡的开裂、剥离脱落,耐火纤维毡强度很低是导致纤维材料失效的3个主要机理。研究结果为新型耐火材料的研制或改进提供了重要依据。     

水泥窑高温带用MgO-CaO-ZrO2耐火材料的研制

研究了利用天然原料制备MgO-CaO-ZrO2新型耐火材料。分析了该MgO-CaO-ZrO2材料的物相组成。用反应烧结合成了该复相材料。用XRD对其进行了相分析,结果与理论分析相一致。     

反应烧结铁铝尖晶石添加量对镁铁铝尖晶石耐火材料性能影响

以反应烧结铁铝尖晶石和镁砂为原料,研究了添加1％、3％、5％、7％、9％和11％反应烧结铁铝尖晶石对制备镁铁铝尖晶石耐火材料的性能影响。利用XRD分析试样的物相组成,SEM观察试样的微观结构。结果表明：在1％～11％范围内,随着铁铝尖晶石添加量的增加,镁铁铝尖晶石耐火材料的热震稳定性和挂窑皮性能提高,但荷重软化温度降低;铁铝尖晶石加入量为5％时,镁铁铝尖晶石耐火材料有较大的体积密度、较高的常温耐压强度和较小的显气孔率。     

红柱石基材料中氧化铝原料的应用研究

实验研究了几种氧化铝原料的加入对高纯红柱石基耐火材料性能的影响,采用XRD,SEM等手段分析了氧化铝原料种类及加入量对试样相组成和显微结构的影响.实验结果表明,纯红柱石制品的烧结性能比添加氧化铝细粉的红柱石制品的好,而不同氧化铝细粉对红柱石制品烧结性能的影响与其纯度及活性有关;红柱石颗粒分解产生的SiO2玻璃相难以全部与氧化铝反应形成二次莫来石;在本试验条件下,当氧化铝细粉加入量达到15%左右时,在试样中引起的二次莫来石化效应和烧成膨胀最大.     

Improvement of Mullite and Magnesia‐Based Refractory Castables Through Addition of Nano‐Spinel Powder

Two different commercial refractory castables based on mullite or magnesia aggregates have been improved through addition of 0–25 wt.% nano‐magnesium aluminate spinel (MA) powder. Physico‐mechanical and refractory properties were tested at different firing temperatures. The phase composition, thermal analysis, and microstructure of these refractory castables were detected using X‐ray diffraction (XRD), differential thermal analysis (DTA), as well as scanning electron microscope (SEM) attached with energy dispersive X‐ray unit, respectively. The castable sample mix containing 10 wt.% nano‐MA spinel powder was chosen as an optimum composition according to its good sintering, mechanical as well as refractory properties.     

Exposure of refractory materials during high-temperature gasification of a woody biomass and peat mixture

Finding resilient refractory materials for slagging gasification systems have the potential to reduce costs and improve the overall plant availability by extending the service life. In this study, different refractory materials were evaluated under slagging gasification conditions. Refractory probes were continuously exposed for up to 27 h in an atmospheric, oxygen blown, entrained flow gasifier fired with a mixture of bark and peat powder. Slag infiltration depth and microstructure were studied using SEM EDS. Crystalline phases were identified with powder XRD. Increased levels of Al, originating from refractory materials, were seen in all slags. The fused cast materials were least affected, even though dissolution and slag penetration could still be observed. Thermodynamic equilibrium calculations were done for mixtures of refractory and slag, from which phase assemblages were predicted and viscosities for the liquid parts were estimated.     

铁钙比对煤灰中耐熔矿物生成的抑制机理研究

铁基助熔剂和钙基助熔剂能有效降低煤灰熔融温度,为了研究铁钙比(Fe2O3/CaO)对煤灰中耐熔矿物生成的抑制机理,根据煤灰化学成分组成,在三种不同系列的煤中加入含铁助剂,调整煤中的铁钙比,对煤灰进行灰熔融温度、煤灰成分分析,对还原性气氛下制备的煤灰渣进行X射线衍射分析(XRD).结果表明:加入含铁助剂可降低煤灰熔融温度,在相同铁钙比下,加入Fe助剂的煤灰熔融温度低于加入FeS2助剂的煤灰熔融温度,硫在煤灰中起增加煤灰熔融温度的作用;煤灰中铁钙比不同对高熔点矿物的生成影响不同,当铁钙比在1~2间时,灰渣中仅有钙长石,当铁钙比在3.5~5.5间时,灰渣中既有钙长石的也有耐熔矿物莫来石的存在,煤灰中铁质矿物和钙质矿物的含量对耐熔矿物的生成有很大影响.     

Utilisation of South Libyan clay for preparation of mullite-alumina based refractory ceramics

Abstract

This work aims to benefit from the wide spreaded clay in south Libya with some alumina (Al₂O₃) additions to prepare and characterise mullite-alumina containing refractory ceramics. The starting materials used in this investigation are local raw clay and chemical aluminium oxide (Al₂O₃). Based on a previous geological survey carried out by the industrial research centre (Tripoli), four different clay samples were selected from different locations of the south of Libya. Representative samples of the four selected clays were investigated using X-ray diffraction (XRD) and differential thermal analysis. The four clay samples were used separately together with aluminium oxide to prepare six different batches containing different proportions of alumina from 0 up to 60% with an increament of 10%. The mullite containing bodies were investigated through their mineralogical compositions using XRD and scanning electron microscopy (SEM) attached with energy dispersive X-ray unit (EDX). The sintering, mechanical and refractory properties of the prepared mullite containing bodies were tested according to the international standard specifications. It is concluded that the densification, mechanical and refractory properties are improved as the alumina content increases on the expense of clay. Mixes containing 60% clay : 40% alumina and 50% clay : 50% alumina respectively, especially those prepared from Agar clay are characterised with good sintering, high mechanical and high refractory properties.     

Significant improvement of refractoriness of Al2O3–C castables containing calcium aluminate nano-coatings on graphite

The performance of alumina-carbon castables containing graphite flakes coated by nanosized Ca-doped γ-Al₂O₃ phases has been investigated in terms of refractoriness under load (RUL) and oxidation resistance tests. The coating characteristics and its beneficial effects in castable matrix have been conceived by water-wettability test, differential scanning calorimetry and some physical characteristics. In this regard, a schematic representation of coated graphite has been proposed to elucidate its sustainability in the refractory mass. The comparative gain in performance of the refractory has also been ascertained by scanning electron microscope (SEM) and X-ray diffraction (XRD) studies of the castable matrix. The sol–gel coating overcomes the pitfalls of including uncoated graphites in castables and should be explored for commercial utilization.