高炉渣处理综述及螺旋法水渣处理工艺的应用

介绍了高炉渣处理方法。通过对不同高炉水渣处理系统进行分析对比,指出螺旋法水渣处理工艺的优缺点,分析了本工艺应用的现实可能性,介绍了主要的设备和工艺流程布置方案。     

Losses in diagonal MHD generator

Losses in an MHD generator not only reduce the power output but also degrade it. The losses due to heat, friction and leakage through insulating-wall/slag have been analyzed for the diagonal generator for better control and performance. The losses due to leakage are higher than the heat and friction losses. The effect of wall temperature on losses is significant. The heat and friction losses decrease with increase in wall temperature, whereas the leakage losses increase with increase in wall temperature. The slag losses reduce power output from the channel drastically.     

Al2O3-W复合材料的抗渣蚀性能

在埋炭条件下,以金属铝粉、氧化钨及刚玉为原料,对以铝热反应为基础制备的Al2O3-W复合材料的抗渣性能进行了研究.结果表明Al2O3-W复合材料的抗渣性能随金属钨含量的增加而改善.金属钨和渣较差的润湿性是一个重要因素,而氧化铝和熔渣的反应机理和常规刚玉质材料的抗渣蚀机理一致.金属钨和渣中被还原的铁相反应生成高熔点相Fe7W6,增加了液相的粘度,抑制了熔渣的侵蚀和渗透.     

含钛熔渣对镁炭质耐火材料的侵蚀

采用静态浸渍法和动态浸渍法研究了TiO2 含量在 2 .4%～ 30 %之间的含钛熔渣对镁炭质耐火材料的侵蚀 ,对侵蚀后试样进行了SEM、XRD和能谱分析 ,提出了含钛熔渣对镁炭质耐火材料的侵蚀机理 :熔渣与耐火材料接触并发生作用 ,熔渣中的TiO2 、FeO等氧化物使耐火材料氧化脱碳并且形成低熔物 ;脱碳及低熔物的熔出使耐火材料孔隙和通道增多 ,这反过来又使熔渣渗入耐火材料内部的速度加快 ,加速了对耐火材料的侵蚀     

Investigation on slag fiber characteristics: Mechanical property and anti-corrosion performance

Inorganic fiber shows good insulation performance in civil construction and industry insulation. In the present paper, tensile strength of slag fiber produced with molten blast furnace slag was investigated systematically with the Weibull distribution theory in comparison with glass and basalt fibers. It was found that the mean tensile strength reached 2578.60 MPa and the shape parameter m in Weibull distribution is 2.4494, which indicates a lower uniformity. Anti-corrosion performances were also studied by means of the mass and strength loss after acid and alkaline solution treatment. Furthermore, SEM and FTIR were used to analyze the structural characteristics of original and treated fibers. This work has proved that the H⁺ and OH⁻ can both break the Si–O bond and then lead to the movement to high wavenumber for the bands of the symmetric stretching vibrations of [SiO₄]-tetrahedra. The anti-corrosion results indicated that slag fibers could not be used in acid environment, while its anti-alkali performance is relatively excellent compared with glass and basalt fibers.     

连铸熔渣检测装置的研究

连铸熔渣检测存在首不少困难,例如,要从各种干扰中检测十分微弱的有用信号,保护传感器能经受高达900℃的环境温度,而且它的大小受有限制。此外,导电的长水口对电涡流检测也非常不利。本课题还是采用电涡流传感器,因为这种传感器较灵敏,容易制造,也较便宜、为了适合导电的长水口,并使传感器小型化,必须设计大幅度的AC恒流源,用来激励检测线圈(传感器)。检测仪器除了恒流源外,主要还有温度补偿、脉冲形成、脉宽鉴别以及编码、译码等电路。本文叙述检测装置的基本要求和设计原理。最后,给出装置的技术指标和工业试验结果。     

碳溶反应温度对高反应性焦炭热态性能的影响

以钢渣为催化剂添加至焦煤中制备高反应性焦炭,研究碳溶反应温度对焦炭热态性能的影响及焦炭反应后的结构变化。结果表明,添加钢渣后,焦炭的反应性提高;随着碳溶反应温度的升高,焦炭的反应性呈线性增加,而反应后强度先缓慢降低然后迅速劣化;焦炭反应后的比表面积先增大而后减小。     

Kinetics of the formation of protective slag layers on MgO–MgAl2O4–C ladle bricks determined in laboratory

Carbon-bonded magnesia and magnesia-alumina bricks are the state of the art lining materials of the sidewalls and the bottom of steel ladles. Industrial trial tests revealed, that a new generation of MgO–MgAl₂O₄–C bricks, where pre-reacted spinel is added in form of a new calcium magnesium aluminate (CMA) raw material, exhibit a longer service life caused by an enhanced corrosion resistance due to the formation of a protective slag layer. In terms of this work, laboratory corrosion tests have been performed in order to mimic the protective slag layer formation and to study the kinetics of the formation. It has been found that the formation highly depends on the amount of iron present in the melt, which leads to the precipitation of the brownmillerite-phase. Furthermore, the study was extended to force the formation of protective slag layers of different composition which are reliable at higher temperatures and wider temperature ranges by targeted adaption of the brick composition. Cup tests showed that there is a potential to manipulate the composition of a protective slag layer by targeted adaption of the brick composition. Especially MgO, Al₂O₃, Fe_xO_y, and SiO₂ from the brick or slag enrich at the slag/refractory-interface.     

Effect of mixing proportions of concrete on its electrical conductivity and the rapid chloride permeability test (ASTM C1202 or ASSHTO T277) results

The rapid chloride permeability test (RCPT)—American Society of Testing and Materials (ASTM) test method C1202 or American Association of States Highway and Transportation Officials (AASHTO) test method T277—is virtually a measurement of electrical conductivity of concrete, which depends on both the pore structure characteristics and pore solution chemistry of concrete. This paper discusses the effects of several factors, such as cement composition, replacement of cement with supplementary cementing materials and inclusion of aggregate, on the electrical conductivity or RCPT results of hardened cement mortars and concrete. Analyses based on published results have indicated that all the three factors may have significant effects on the chemistry and specific conductivity of concrete pore solution, which has little to do with the transport of ions in the solution. Thus, RCPT is not a valid test for evaluation of permeability of concretes made with different materials or different proportions.     

转炉炉渣喷溅的机理及预防措施

转炉炉渣喷溅会带来种种危害,严重威胁炼钢安全,恶化多项技术经济指标。探讨了转炉炉渣喷溅的机理,分析了易发生炉渣喷溅的几种情况,在上述研究的基础上,提出了防止炉渣喷溅的种种措施。