Investigation on Production and Markets of Silica Bricks in China

The annual output of China ' s silica brick amounts up to over 300 thousand tons, which accounts for more than 10% of the total output of silica bricks in the world. Besides satisfying domestic markets , China s silica bricks have been exported to many countries and regions such as Japan, USA etc. In this paper, the situation of silica bricks production, technology, sales and exporting have been described. Also suggestions on improvement of silica bricks quality and exporting, corporation with foreign partners have been put forward in order to win larger market share both at home and abroad.

Chinese Standard on Refractories——Silica Brick for Coke Oven

This standard specifies the classification,specification, test method, quality appraisal procedure,labeling, packing, transportation, storage and quality certification of silica brick for coke oven.

Microstructure Analysis of Used Silica Brick in Coke Oven of Meisteel

Microstructure analysis shows quartz remains more or less in used silica brick for coking chamber of coke oven, and quartz gradually becomes metastable cristobalite and then translates into tridymite in used brick for high temperature combustion chamber. Phase change of silica brick only limits to transformation of quartz and metastahie cristobalite. When finished, structure of silica brick tends to stable. Carbon sedimentates and graphitize. helping to protect the silica brick and improve heat conductivity of silica brick for coking chamber.

RUL of Un-burnt High Purity Silica Bricks Used in Glass Industry

High purity silica bricks have stable physical properties,except for the RUL （0.2 MPa） exhibiting extreme two different levels of high-level RUL T0.6 of 1 683-1 686 ℃ and low-level RUL T0.6 of1 174-1 184 ℃.The low RUL phenomenon was researched,the formation reasons and solutions were analyzed in this paper.The low-level RUL T0.6 of 1 174-1 184 ℃ of the un-burnt high purity silica bricks is a pseudo RUL T0.6 phenomenon for the transformation of crystalline morphology.The real RUL T0.6 of the specimen hot treated at 1 093 ℃ is ＞ 1 680 ℃.Therefore,the un-burnt high purity silica bricks shall be hot treated at about 1 100 ℃ firstly before testing RUL.For the heating up of the lining of glass tank arch,baking curves with long holding time at 1 100 ℃ shall be strictly obeyed to avoid the obvious shrinkage negatively influencing the lining stability.

Development and Application of Zero Expansion Silica Brick for Hot Repairing of Coke Oven

In order to meet the needs of hot repairing technology of coke oven, the zero expansion, silica brick with super properties has been developed, and the problem of poor thermal stability of common silica brick has been over-comed . This product can be directly used after being rapidly heated after construction. At present, it has been applied in coke ovens in Italy and Baosteel.

Performance of High Thermal Conductivity Dense Silica Bricks and Their High Thermal Conductivity Mechanism

High thermal conductivity dense silica bricks have the higher thermal conductivity than ordinary silica bricks,which is conducive to the realization of energy saving and emission reduction in the iron and steel industry.The performance of ordinary silica bricks and high thermal conductivity dense silica bricks was compared,and the high thermal conductivity mechanism was analyzed.The results show that(1)compared with ordinary silica bricks,high thermal conductivity dense silica bricks have the characteristics of higher thermal conductivity,lower apparent porosity,higher tridymite content,higher compressive strength,and higher thermal expansion;(2)by increasing the tridymite content and reducing the porosity,the close packing of honeycombα-tridymite improves the density and continuity of the SiO_(2)frame structure of the silica bricks,and the larger area perpendicular to the heat transfer direction improves the thermal conductivity of the bricks;(3)the densification of the silica bricks also increases the thermal expansion of the bricks,but they still meet the standard requirements.

Silica Bricks GB/T 2608-2012

1 Scope This standard specifies the classifcation, technical requirements, test methods, quality appraisal procedure, packing, marking, transportation, storage and quality certificate of silica bricks.

Silica Brick for Hot Blast Stove

This standard specifies the glossary and definition, marking, shape and dimension, technical requirements, test method, quality appraisal procedure, packing, label, transportation, storage and quality certification of silica brick for hot blast stove.

High Quality Silica Bricks for Glass Melting Furnace

This standard specifies the classification, technical requirements, test method, inspection rules, marking, packing, transportation, storage and quality certification of high quality silica bricks for glass melting furnace.

Silica Refractory Bricks

1 Scope This standard specifies the classification, technical requirements, test methods, quality appraisal procedures, packing, marking, transportation, storage, and quality certificate of silica refractory bricks.

Silica Refractory Bricks for Glass Melting Furnace

1 Scope This standard specifies the classification, technical requirements, test method, inspection rules, marking, packing, transportation, storage and quality certification of silica refractory bricks for glass melting furRaces.

炉衬材料和加热速率对铸造焦成块性能的影响

以煤粉、焦粉和煤沥青为原料,加水10%(w),捣固为500 mm×350 mm×400 mm的煤饼。入炉温度为650℃时,将煤饼放入单面加热炉内,炼焦终温为1050℃,在不同的加热速率下焦化为焦炭。研究了炉衬材料(黏土砖和硅砖)和加热速率(0.5、0.6、0.7℃·h^(-1))对煤饼自身升温速率和焦化后焦炭性能的影响。结果表明:由于硅砖的热导率优于黏土砖的,硅砖炉衬侧煤饼在水分挥发阶段时间较短,并在200~600℃煤饼第一收缩峰阶段自身升温速率较大,导致煤饼内部应力较大,焦炭块度较低。焦炉炭化室采用硅砖炉墙时加热速率宜在0.5℃·h^(-1),黏土砖作为炉墙时加热速率宜在0.6℃·h^(-1)。

罐式煅烧炉产能因素分析及应用

针对罐式煅烧炉生产运行中出现的首二层温度提升难、频繁“放炮”、料罐硅砖使用寿命短、达不到设计产能等问题,采取了预热空气通道优化、含尘废气收集、石油焦精准配料等一系列改造措施,并规范了罐式炉日常操作方式,使首二层温度提升50℃以上,“放炮”现象基本消除,单罐产能突破设计值100 kg/h。

焦炉炭化室用后硅砖的分析研究

为了解焦炉炭化室硅砖在使用中的损毁机制,对使用了40多年的JN43型侧喷式焦炉炭化室的硅砖进行取样分析,对样品的外观、理化性能、物相组成、显微结构等进行了分析研究。分析发现:1)用后的焦炉炭化室上、中、下3个不同部位的硅砖从炭化室到燃烧室方向,都形成了颜色、质地显著不同的层带;2)煤中的焦油组分对炉墙砖产生了很强的渗透作用,而煤中氧化物组分对炉墙砖的渗透轻微;3)炉墙在高温作用下发生烧结,体积总体呈收缩趋势;4)炉墙燃烧室侧约1/3炉墙厚度内的砖中方石英和石英相消失,鳞石英晶粒显著长大,较多开口气孔变成了闭气孔,线膨胀率降低;5)炉墙靠炭化室侧约1/2炉墙内石英和方石英部分鳞石英化,造成该区域线膨胀率降低。

焦炉用耐火材料的改进及应用

简述了焦炉结构,分析了焦炉所用传统耐火材料存在的不足,介绍了一些新型耐火材料的性能特点及其在焦炉蓄热室、烟道、燃烧室、炭化室、加煤孔、上升管、炉门、热回收焦炉布风器等部位的应用,并对比分析了使用效果。生产实践结果表明:新型耐火材料的应用,对焦炉的节能、环保、使用寿命都具有积极影响,有助于焦化企业的环保升级、降本增效。

硅溶胶-酚醛树脂共结合Al_(2)O_(3)-SiC-C砖性能研究

为了缓解酚醛树脂碳化引起的Al_(2)O_(3)-SiC-C砖组织结构劣化,提升Al_(2)O_(3)-SiC-C砖的力学性能和抗渣性能,以粒度分别为5~3、3~1和≤1 mm的高铝矾土为骨料,以电熔白刚玉(≤0.045 mm)、SiC(≤0.075 mm)、α-Al_(2)O_(3)微粉和鳞片石墨(≤0.15 mm)等为基质,以热固性酚醛树脂和硅溶胶为结合剂,制备了硅溶胶-酚醛树脂共结合Al_(2)O_(3)-SiC-C砖。在酚醛树脂外加量为4.5%(w)的基础上,探究了硅溶胶的加入量(外加质量分数分别为0、0.45%、0.90%和1.35%)对Al_(2)O_(3)-SiC-C砖常温力学性能、高温力学性能和抗渣性能的影响。结果表明:引入适量硅溶胶可以有效提升Al_(2)O_(3)-SiC-C砖的力学性能及抗渣性能,当硅溶胶加入量为0.45%(w)时,试样具有优异的常温、高温力学性能及抗渣性能。

四元矿化剂对硅砖微观形貌及物理性能的影响

以两种不同粒径的石英砂为原料,石灰乳和纸浆废液为结合剂,经1430℃高温烧成制备硅砖,研究复合矿化剂及保温时间对硅砖物相组成、显微结构及主要物理性能的影响规律。研究结果表明,经1430℃保温10 h后,烧成试样由鳞石英、方石英及少量残余石英组成。添加铁鳞粉-CaO-MnO_(2)-SiC或铁鳞粉-CaO-MnO_(2)-TiO_(2)四元矿化剂时,硅砖中典型的骨料-基质耐火材料结构消失,并逐步出现“均质化”效应。当矿化剂为铁鳞粉-CaO-MnO_(2)-TiO_(2)时,经1430℃保温10 h后,烧成试样具有较好的综合性能,其体积密度、显气孔率及常温耐压强度分别约为(1.93±0.01)g·cm^(-3)、(14.9±0.1)%及(55.05±0.64)MPa。在最佳矿化剂组分及烧成制度基础上,延长保温时间至15或20 h时,材料中残余石英含量降低,但鳞石英含量增大,导致体积膨胀效应增强,使材料的物理性能受损。

海绵城市背景下硅砂透水砖性能研究

采用氢化双酚A型环氧树脂改性硅砂透水砖,探究硅砂粒径(35目、50目、70目)与环氧树脂掺量(2%、4%、6%、8%)对硅砂透水砖的强度、透水性能、保水性能、滤水性能以及防滑性能的影响规律。试验结果表明:当硅砂粒径为50目、环氧树脂掺量为4%时,硅砂透水砖的抗压、抗折和防滑性能最好,透水速率为1.5 mL/(min·cm^(2))、保水率为0.068 g/cm^(3),滤水率为90.2%。

水泥窑用不同铝硅系耐火砖抗碱侵蚀性能研究

采用坩埚法对市售铝硅系硅莫砖1680、硅莫砖1550、抗剥落高铝砖JA、低铝莫来石砖M55进行抗碱侵蚀对比试验,对侵蚀后坩埚进行物相及微观结构分析并探讨碱侵蚀行为。结果表明:1)硅莫砖和低铝莫来石砖抗碱侵蚀性相对较好,抗剥落高铝砖抗碱侵蚀性能较差。2)硅莫砖中的碳化硅高温下氧化,在耐火砖表面形成致密层,可有效抑制K元素的侵蚀渗透,因此材料的抗碱侵蚀性能优良;抗剥落高铝砖由于选用的原料品级较差,样砖显气孔率很高,碱渗透最深,并生成大量的钾霞石而导致试样产生大的碱裂,因此材料的抗碱侵蚀性能很差。3)低铝莫来石砖显气孔率低,所用原料中莫来石均质料及红柱石结构致密,且结构中存在一定数量的高硅非晶相,可与K元素反应生成高黏度玻璃相阻塞气孔,使得材料抗碱侵蚀性能较好。

九钢4号高炉热风炉快速凉炉及烘炉实践

因九钢4号高炉3座顶燃式热风炉热风出口及支管经常出现发红跑风的现象,故利用这次大修机会,对其进行凉炉检修。通过制定合理的硅砖热风炉凉炉方案,采用助燃空气从下部经冷风管道通风冷却的方式,按照计划凉炉曲线降温实现了安全顺利的凉炉。对此次凉炉总结操作经验,为今后硅砖热风炉凉炉及烘炉提供重要参考。