玻璃池窑硅质耐火材料结石的鉴定及成因

作者对玻璃熔窑中各种硅质结石,采用岩相分析和X射线衍射分析的方法进行了鉴定和分类,探讨了各种硅质结石的形成和变化过程,提出克服硅质结石的具体措施.     

高硼硅耐热玻璃器皿硅质耐火材料结石分析

介绍了硅质耐火材料结石快速综合分析鉴别的方法，并深入探讨了高硼硅玻璃的碱性气体和飞料对硅质耐火材料的侵蚀机理，同时总结出了预防硅质耐火材料结石的措施和延长玻璃窑炉使用寿命、提高产品质量的途径。     

玻璃工业中的硅质耐火材料

本文阐述了硅质耐火材料的物理和化学性质,讨论了氧化硅的各种主要矿物相对膨胀的影响,提供了选择硅质耐火材料的需要查找的各种重要性质表,概述了硅质耐火材料在使用时的维护.     

平板玻璃熔窑中耐火材料侵蚀形成的结石

介绍玻璃熔窑中使用的各种类型耐火砖材和泥料,经历高温下一系列物理化学反应和火焰与玻璃的机磨损,在玻璃液中形成的各种耐火材料结石及其鉴别特征     

熔窑耐火材料的侵蚀及产生的缺陷

1、引言在玻璃生产中,除了对耐火材料作为构筑材料而考虑其耐久性外,还须十分重视其对玻璃质量的影响.在此类情况下,对玻璃质量的影响主要是被侵蚀下来的耐火材料混入玻璃液中,使玻璃制品产生缺陷.缺陷主要为砂粒、节瘤及波筋等异物缺陷.可能直接影响玻璃质量的是池壁砖、窑底砖、     

硅质不定形耐火材料在窑炉上的合理使用

将玻璃窑炉冷修砌筑和热修保窑有机地联系起来,合理地使用不定形耐火材料,充分发挥这些不定形耐火材料的作用,对窑炉节能降耗、稳定生产、延长窑炉寿命起着至关重要的作用。     

控制SiO2对氧—燃料钠钙玻璃窑的侵蚀

本文介绍了玻璃窑窑顶的损坏原因和解决办法。采用适当的窑结构和操作方法，就可以避免氧－燃料玻璃窑硅质耐火材料的快速损坏。     

Reduction of cracking in refractory structures of thermal setups

The development of fracture in a large-size lining of coke banks at the Stakhanov Coal-Tar Plant was studied. The main parameters of crack formation and the lining zones most susceptible to cracking were determined. A method of preventing the development of cracking in these zones is suggested that is based on the use of crack compensators, formed on the surface of lining blocks, favoring accommodation of temperature-induced deformations. Translated from Ogneupory i Tekhnicheskaya Keramika, No. 3, pp. 35–37, March, 1997.     

Anisotropic expansion of siliceous refractories

Conclusions During a study of the bloating of siliceous bodies we detected anisotropic expansion of the refractories and established its cause. Controlled regulation of the bloating of refractories is found to be possible.The rules obtained for the anisotropic expansion of refractories indicate the desirability of tightening up the specifications GOST; incorporating additional specifications about the measurement of shrinkage or expansion in the products.It can be assumed that further studies of this phenomenon will extend our ideas on the relationship between the structure of refractories in their production conditions and heat processing conditions.Translated from Ogneupory, No. 2, pp. 55–59, February, 1972.     

Pozzolanic activity of various siliceous materials

The accelerated pozzolanic activity of various siliceous materials, like silica fume, fly ash (as received and fine ground), quartz, precipitated silica, metakaolin and rice husk ash (RHA; various fineness and carbon content), has been determined. The compressive strength of accelerated tests has been compared with cubes cured in water at 7 and 28 days. Maximum activity has been observed in case of RHA (<45 μ), followed by quartz and silica fume. The 10% replacement of cement by sand has shown accelerated pozzolanic index of 92% compared with 85% required in ASTM for silica fume as mineral admixture.     

Improving the thermal-shock resistance of siliceous refractories

Conclusion The thermal-shock resistance of siliceous specimens with additions, measured by the water-heat cycling method, as a rule, is increased with increase in the content of the additives from 5 to 30%, and is maximal for a content of 30% chromite-periclase. The crack resistance, determined by the air-heat cycling method is characterized by a maximum ¯R_T factor for each type of additive with a content of 15–20%. The maximum ¯R_T value is shown by specimens containing 20% chromite periclase.The maximum thermal-shock resistance of the specimens, without additives and with additions of silciding filling scrap, chrome-ore fractions <0.5 and 0.09 mm, clay, and chromitepericlase relate to each other respectively as follows: 11.82.52.83.55, and the crack resistance as 10.44.63.82.98.1. The number 2.9 obtained with specimens containing clay apparently is not maximal, since the clay content was limited to 15% for the reasons stated.Clay additives increase the thermal-shock resistance of the dinas [3], but markedly redice the temperature of initial softening under load and the mechanical strength. Therefore, thermal-shock resistant dinas with clay additions can be used only in special working conditions.The most promising of the compositions studied is one with an addition of chromite-periclase scrap. This helps to create a porous, microcracked structure which increases the thermal-shock resistance by five times (water-heat cycle tests) and the crack resistance by more than eight times (air-heat cycle method) compared with the ordinary dinas.The optimum content of chromite-periclase scrap, to obtain siliceous refractories with the maximum thermal shock resistance, is 15–20%. However, considering the reduced refractoriness under load noted with this (respectively to 1480 and 1370 deg C) we recommend that the additive be limited to 10%.Translated from Ogneupory, No. 4, pp. 9–11, April, 1991.     

硅藻土在氟橡胶中的应用

研究了硅藻土等5种填料对氟橡胶硫化特性、力学性能及老化性能的影响。试验结果表明,添加进口硅藻土MW-25对氟橡胶强度提高最为明显,且具有良好的老化、硫化性能,优异的回弹性、低压缩永久变形性能及良好的加工性。     

ASR pessimum behaviour of siliceous limestone aggregates

Siliceous limestone aggregates have “pessimum” behaviours similar to those observed for pure siliceous aggregates such as flint or opal. For high alkali contents concretes based on fine and coarse reactive siliceous limestone aggregates swell less than concretes based on fine reactive siliceous limestone aggregates and non-reactive coarse aggregates. The reduction of the swelling is more significant for a “micritic” limestone containing highly reactive free silica than for a “sparitic” limestone containing less reactive free silica. The consumption of a part of the alkalis by non-expansive processes such as chemical sorption on silanol sites of reactive silica and pozzolanic C-S-H is expected to explain the reduction of the swelling.