外文翻譯---制備及鼓風(fēng)爐產(chǎn)生的玻璃陶瓷渣性能燒結(jié)過程-wenkub
2023-05-19 10:31:09 本頁面
【正文】 al growth step. The disadvantage of the conventional route is that it is difficult to vitrify the raw materials and the high energy consumption in this step. An alternative manufacturing method to produce sintered glass–. ceramics, in which sintering and crystallization of fine glass powders take place simultaneously, has recently been reported[9]. In such route fine glass powders are pressed and sintered, and the crystallization occurs with densification. However, this route also needs a short time to vitrify raw materials at high temperature for preliminary glassmaking. The blastfurnace slag is formed in the processes of pig iron manufacture from iron ore, contains bustion residue of coke, fluxes of limestone or serpentine, and other materials. If the molten slag was cooled quickly by highpressure water, fine grain glass of vitreous Ca–Al–Mg silicate can be formed [10]. This suggests the blastfurnace slag can be used as a glass source to make sintered glass–ceramics and vitrifying raw materials at hightemperature step can be omitted. The free glass surfaces are preferable sites for devitrification and thus crystallization may occur without any nucleating agent. Therefore, the finely ground slag powder can used as the main ponent of parent glass. Comparing with the two sintered methods mentioned above, a remarkable advantage of the present study is absent of vitrification step because of the using of blastfurnace slag. Thus a low energy cost and manufacture simplicity can be expected. However, in our previous studies glass–ceramics prepared with pure blastfurnace slag show poor properties [11]. Therefore, some sintering additives are needed. In this study, we show when using blastfurnace slag to prepare glass–ceramics by a conventional ceramics route, if suitable amount of potashfeldspar is added. Glass–ceramics with high microhardness andbending strength as well as lower water absorption can be obtained. 2. Experimental procedure The slag (provided by Anyang iron Corporation of China) was pulverized by ball milling for about 24 h (size in the range of 10–20 mm), and then blended with 5–10 wt% potash feldspar powder. The mixtures were ball milling for 2 h. We use K5, K8 and K10 to denote the weight percent of potash
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