硅酸盐学报

本文研究了含HF的中性与还原性气流在高温下对于粘土砖与高铝氧砖的侵蚀作用。探讨了HF的浓度变化、温度变化及气流中的水蒸气含量变化等因素,对于侵蚀作用的影响。借助于HF气体与矽酸铝耐火材料各个矿物组分间的化学反应的热力学分析,可以较满意地阐明侵蚀作用的机理。 在500～900℃的温度范围内,提高温度不利于侵蚀作用的进行。含HF0.1%的气体,在700℃以上对两种耐火材料的侵蚀均甚轻微。当气流中HF的浓度低于1%时,莫来石抵抗侵蚀的能力,特别在700℃以上,远较方石英为优。当HF的浓度到达6%时,莫来石在上述温度范围内也被严重地侵蚀了。气流中含有水蒸气可以减轻HF的侵蚀作用,类似高炉气的还原性气氛更可使低浓度的HF气体的侵蚀作用大为减弱。

The corrosive action of neutral and reducing gas streams containing HF at high temperatures on fireclay and high-alumina refractories has been investigated. The influences of HF eoncontration, temperature variation and the water vapor content in the gas stream etc. have been eritically studied. With the aid of thermodynamie analyses of the various reactions between HF and the mineral constituents of the alumino-silicate refractories, it has been found possible to satisfactorily explain the mechahism of the corrosive actions.Within the temperature range 500—900℃, it has been found that an increase in temperature is always unfavorable to the corrosive reactions. At temperatures above 700℃, the action of neutral gas streams containing 0.1％ HF is very mild on both kinds of refractories. For gas streams containing HF up to 1％, mullite is murh more resistant to attack than eristobalite, especially for temperatures over 700℃. When the HF concentration is increased to 6％, mullite is, however,also severely attacked in the above mentioned temperature range. Gas streams containing water vapor is helpful to minimize the corrosive action of HF gas. Lastly, it is interesting to note that a reducing gas stream, similar in composition to that of blast furnace gas, further supresses the corrosive action of HF in low concentration (0.1％), due probably to some sort of carbon protective film formed on the surfaces of refractory sample grains.