高温下电解槽衬用耐火材料的渗透

铝电解槽阴极所用耐火挡板砖的蚀损主要是由氟化物熔体和钠蒸汽的化学侵蚀引起的。当砖与腐蚀介质起化学反应时，它们经历着一些物理变化和化学变化，最终将削弱电解槽的工作能力，甚至会缩短它的寿命。近来对硅酸铝耐火材料性能的研究显示出在材料的渗透性和它们的抗化学侵蚀性之间存在一定的联系。由于真实的环境不能再现，本文所述例子中的性能，均在室温条件下测出。在当前研究中．为了研究从室温上升到700qC渗透性是如何变化的，运用了最新开发的设备进行了各种不同的实验，并试图再现挡板砖的实际环境。对室温和高温下的结果进行了对比和分析，得出选择铝电解槽衬的最好方法。     

High Temperature Gas Permeability Tester for Refractories and Its Application

In this paper, an ideal structural model and a scientific and practical mathematical model of high temperature permeability testing technology were established based on the formula of gas permeability at room temperature according to Darcy's equation and Forchheimer equation and combined with the basic law of gas mechanics and the resistance loss of gas movement process at high temperatures. Through a gas heater, the safe heating of gas from room temperature to the test temperature was realized; the pressure sealing of high temperature permeability test technology was studied using high temperature resistant flexible material instead of silica gel material and combining preloading with system expansion and continuous loading. Based on the above research, a high temperature gas permeability tester for refractories has been developed and the test temperature can be up to 1 000 ℃. The equipment was applied to research refractories, showing well using effects.     

Modified Pressure-Decay Technique for Evaluating the Permeability of Highly Dense Refractories

The experimental evaluation of permeability parameters encounters different difficulties, depending on the features of the materials. Traditional steady-state techniques for refractory castables and other highly dense ceramics demand arduous work and require reliable measurements at high pressure and for extremely low flow rates. In this paper, a recent and promising technique known as vacuum-decay permeametry is modified to consider the effect of gas compressibility and fluid inertia. Darcy's law is replaced by Forchheimer's equation, which has been proved to better represent the interactions between fluid and a castable porous medium. The modified method is modeled and applied experimentally to refractory samples with different permeability levels. Results that have been compared to a well-established steady-state permeametry method confirm the validity of the model.     

Refractories

SiAION Bonded Corundum Products Developed by Sinosteel LIRR Used Successfully for Semi-coke Bed of Baosteel＇ s COREX-C3000 Device;Electric Power Reform Will Cut Refractories Production Cost＇ s Stress;2008 China Refractories Price Prediction.     

Refractories

Refractories Production Status During Jan. to Aug. of China
It is reported by the Association of China Refrac- tories Industry, during January to August of 2008, the refractories output in China is 16. 9649 million tons, among which, dense shaped refractory products are 10.7349 million tons, insulating refractory products are 338.5 thousand tons, monolithic refractories are 5. 8914 million tons.     

Refractories

Export of SiC and Brown Corundum of China in 2008By the statistics of the customs, the total SiC export volume of China in 2008 was 231.599 3 thousand tons, decreasing 4.64% year on year; in which, the export volume to USA, Japan and Korea was 93.349 9 thousand tons, 86.962 1 thousand tons and 16.464 1 thousand tons, respectively.     

Coke Quality and Blast-Furnace Performance

On the basis of six-year operational data for a 5000-m³ blast furnace, the dependence of the coke consumption on its strength M₂₅ and M₁₀ and the content of the >80 mm fraction is calculated by different methods. The quality of the coke has a clear influence on coke consumption and blast-furnace economics. As an illustration, for some of the equations derived, means are established for predicting the economic benefit associated with improving coke quality and reducing its consumption, in specific blast-furnace conditions.     

用后耐火材料的处理

多年来，维苏威玻璃集团（VGG）公司一直在关注着与耐火材料处理有关的欧洲环保立法发展状况。为减少环境污染，致力于硅砖的回收及其它异形砖的研制，以期延长窑的使用寿命，降低成本。     

SiC晶须加强的高铝质耐火材料

叙述了在采用SiC晶须加强的高铝质耐火材料生产过程中的处理参数。通过修改处理参数，诸如铝矾土的平均粒度、SiC晶须的含量以及在成型期间施加的压力可以提高断裂韧性。     

碳质耐火材料

由于具有独特的性能，例如热导率高、热膨胀低、抗热震性能好、与渣接触化学活性小，因而碳质或含碳耐火材料被广为关注。它们被分为两类：碳砖/大块和含碳材料。含碳材料又被进一步划分为碱性含碳耐火材料和非碱性含碳耐火材料。分析了制造过程。对其物理性能、热性能、机械性能、化学性能也进行了评价。对这些类型耐火材料的抗氧化剂和结合剂也进行了评论。其应用也被仔细分析。     

Stabilized Dolomite Refractories

A technology of environment-friendly refractories based on briquetted dry-ground dolomite, magnesia-silicate raw materials, and stabilizing additives has been developed. The potential use of the newly designed refractories as an alternative to chromite-periclase refractories is emphasized.