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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Thermal process and mechanism of phase transition and detoxification of glass-ceramics from asbestos tailings
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Thermal process and mechanism of phase transition and detoxification of glass-ceramics from asbestos tailings

机译：来自石棉尾矿玻璃陶瓷玻璃陶瓷的热处理及机理

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Based on the chemical and mineral composition of asbestos tailings, the asbestos tailings powder was pre-fired, formed into green body and finally heat-treated to prepare glass-ceramics through the processes of crystallization and sintering. The main crystal phases of the sample were forsterite and enstatite, and the minor crystal phases were magnesioferrite and diopside. The effects of crystallization temperature (787-867 degrees C) and sintering temperature (1150-1250 degrees C) on crystallization and phase change, micromorphology and physical-chemical properties of glass ceramics were investigated by means of thermogravimetry-differential scanning calorimetry analysis (TG-DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM-EDS) and mechanical properties tests. The results showed that the toxic phase chrysotile was almost converted into forsterite when the asbestos tailings powder was pre-fired at 700 degrees C for 1 h. During the sintering process of the green body, with the increase in the crystallization temperature, the content of the forsterite firstly increased and then decreased, and the enstatite increased gradually. After crystallizing at 850 degrees C for 1 h and holding at different sintering temperatures for 1 h, the glass-ceramics samples were obtained. With the increase in sintering temperature, the content of diopside in the samples gradually decreased, the hematite gradually disappeared and magnesioferrite precipitated at the same time. The crystal morphology was transformed from aggregates of spherulites and ellipse into intertwined bodies of spherulites, ellipse and round bar-like shape. The glass-ceramics achieved optimum compactness at the sintering temperature of 1200 degrees C with the water absorption rate being 0.026%, the bulk density being 3.164 g/cm(3), and the flexural strength being 88 MPa, which reached the standard of glass ceramics for construction. In the process of preparing glass-ceramics from asbestos tailings, the
机译：基于石棉尾矿的化学和矿物组成，预先烧制石棉尾矿粉末，形成生坯，最后热处理，通过结晶和烧结的方法制备玻璃陶瓷。样品的主要晶体相是Forsterite和山牙石，并且少量晶体相是氧代锰铁和缩芯。通过热再生 - 差示扫描量热法分析研究了结晶温度（787-867℃）和烧结温度（1150-1250摄氏度）对结晶和相变，微观形态和物理化学性质的影响，微观和相变，微晶和物理化学性质（TG -DSC），X射线衍射（XRD），扫描电子显微镜（SEM-EDS）和机械性能测试。结果表明，当在700℃下预先烧制石棉尾矿粉末时，毒性相结石几乎转化为Forsterite。在绿体烧结过程中，随着结晶温度的增加，叉座的含量首先增加，然后降低，并且山峰逐渐增加。在850℃下结晶1小时并在不同的烧结温度下保持1小时后，得到玻璃陶瓷样品。随着烧结温度的增加，样品中硫代玻璃界含量逐渐降低，赤铁矿逐渐消失，镁铁矿同时沉淀。将晶体形态从球石和椭圆的聚集转变为阵挛性的球晶体，椭圆形和圆形棒状形状。玻璃陶瓷在1200℃的烧结温度下实现了最佳的紧凑性，吸水率为0.026％，堆积密度为3.164g / cm（3），弯曲强度为88MPa，达到玻璃标准建筑陶瓷。在从石棉尾矿制备玻璃陶瓷的过程中，

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