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-在線瀏覽
2025-07-31 10:31本頁面
【正文】 r 95 h and then the residual rate was calculated. 3. Results and discussion Table 1 shows the chemical position of blastfurnace slag obtained by Xray fluorescence. The nominal position of the blended mixture is given in . shows the XRD patterns of the blastfurnace slag. It can be seen that the chemical position of the slag involves SiO2, CaO, Al2O3, and MgO as its major ponents. Fe2O3 and TiO2 that act as nucleating agents can greatly enhance the crystallization. Due the presence of Fe2O3 and TiO2, other nucleating agents are not needed. A small amount of gehlenite exists in the amorphous glass( ). The primaryprecipitated phase can act as heterogeneous nucleating centers. In fact, crystallization is favored at the surface of glass particles and primaryprecipitated phase, since nuclei may be formed without the impedance of the surrounding materials, taking into account the volume variation from glass to crystal. the DSC curves of the blended mixture. The small endothermic peak (737–741 ℃ ) indicates the molecular rearrangement in this temperature. The exothermic peak (800–900 ℃ ) corresponds to the crystallization reaction of the glass. With 5 wt% potash feldspar additive, the glass powders have an intense exothermic effect at 840 ℃ , indicating the formation and growth crystals. With more potash feldspar additive, the exothermic peak increases slightly. Therefore, a nucleation temperature in the range of 720–760 ℃ and a crystallization temperature in the range of 800–900 ℃ were employed, respectively. the SEM images of the samples. The results show that crystallization is mainly induced by surface nucleation in samples K8 and K10, but by both surface and bulk nucleation in sample K5 since crystallization take place throughout the entire volume in the sample. Uniform, ultrafine crystalline grains with sizes of 2–5 mm exist in sample K5. In contrast, there are only small amounts of crystalline phases in K8 and K10 as shown by XRD patterns (). Alkali feldspar crystals are known to give excellent glasses but they are unable to be crystallized in practical periods of time. They have been successfully developed by exploiting the tendency of powdered glass to devitrify during appropriate heat treatments in recent work
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