Effect of Na3PO4·12H2O on foam glass-ceramics prepared from high titanium blast furnace slag
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摘要: 以高钛型高炉渣和废玻璃粉为主要原料，碳酸钙为发泡剂，硼砂为助熔剂，采用“一步法”烧结在900 ℃低温下制备了微晶泡沫玻璃。借助DSC、XRD、SEM等分析测试手段，研究了磷酸三钠（Na3PO4·12H2O）添加量对制备微晶泡沫玻璃的影响。结果表明，在不同的磷酸三钠添加量（0%～10%，质量分数）下，微晶泡沫玻璃的主要物相变化不显著，均为透辉石Ca(Mg, Al)(Si, Al)2O6，富铁普通辉石Ca(Mg, Fe)(Si, Fe)2O6以及普通辉石CaMgSi2O6；随着Na3PO4·12H2O含量增加，微晶泡沫玻璃抗压强度和导热系数减小，体积密度和吸水率先减小后增大。当磷酸三钠添加量为6%时，微晶泡沫玻璃具有最优的综合性能。Abstract: Foam glass-ceramics was prepared by one step sintering method at 900 ℃, using high titanium blast furnace slag and waste glass powder as the main raw materials, with calcium carbonate and borax as the foaming agent and fluxing agent, respectively. The effects of Na3PO4·12H2O on the foam glass-ceramics were investigated by DSC, XRD and SEM. The results show that the main phase compositions of the glass-ceramics, which include diopside Ca(Mg, Al)(Si, Al)2O6, iron-rich common pyroxene Ca(Mg, Fe)(Si, Fe)2O6 and common pyroxene CaMgSi2O6, change scarcely with the variation of Na3PO4·12H2O addition (0% to 10%, mass fraction). As the content of Na3PO4·12H2O increases, the compressive strength and thermal conductivity of the foam glass-ceramics decrease, while the bulk density and water absorption decrease first and then increase. At the Na3PO4·12H2O content of 6%, the foam glass-ceramics has the best comprehensive performances.
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图 3 不同Na3PO4∙12H2O添加量样品的XRD谱
Figure 3. XRD patterns of sintered sample with different Na3PO4∙12H2O addition
图 4 不同磷酸三钠加入量样品的SEM形貌
Figure 4. SEM images of sintered sample with different Na3PO4∙12H2O addition
图 5 不同Na3PO4·12H2O添加量微晶泡沫玻璃的性能
Figure 5. Characteristics of foam glass-ceramics with different Na3PO4∙12H2O addition
表 1 两种原料的主要化学成分
Table 1. Main chemical compositions of the raw materials
% 原料 SiO2 CaO TiO2 Al2O3 MgO Fe2O3 Na2O K2O 其他 高钛高炉渣 24.72 28.39 21.40 13.64 7.05 2.76 0.26 0.56 1.22 废玻璃粉 71 8.91 1.47 0.07 13.1 0.83 4.62 
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