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以蓟县锰方硼石重选尾矿为主要原料,采用低温烧结制备以单斜辉石为主晶相的微晶玻璃,探讨焙烧制度以及粉体粒径对微晶玻璃性能的影响。采用差热分析、X射线衍射分析和扫描电子显微镜观测等测试手段,对不同条件下制备的微晶玻璃样品性能、晶体结构和显微形貌变化进行了研究,分析了影响样品性能的主要因素以及尾矿中残余锰方硼石促进低温烧结微晶玻璃的机理。结果表明:当烧结温度为890℃时,形成直径约0.1~0.5μm、长度1~2μm,表面较平整的四方柱状结构的单斜辉石晶体。该微晶玻璃样品的抗折强度随着粉体粒径的减小而提高,当粉体的粒径d90达到5.71μm时,样品的抗折强度达128 MPa。尾矿中剩余的锰方硼石矿物是大幅度降低微晶玻璃烧结温度的关键成分。
Taking Jixian manganese cubic boronite as tailor-made tailings as main raw material, low temperature sintering was used to prepare glass ceramics with clinopyroxene as the main crystalline phase, and the effects of roasting system and particle size on the properties of glass ceramics were discussed. Differential thermal analysis, X-ray diffraction analysis and scanning electron microscopy were used to investigate the properties, crystal structure and morphology of the glass-ceramics prepared under different conditions. The main factors influencing the properties of the samples were analyzed. As well as the residual manganite boron in tailings to promote the low temperature sintering glass-ceramics mechanism. The results show that when the sintering temperature is 890 ℃, a clinopyroxene crystal with tetragonal columnar structure with a diameter of 0.1 ~ 0.5μm, a length of 1 ~ 2μm and a flat surface is formed. The flexural strength of the glass-ceramic sample increases with the decrease of the particle size. When the particle size d90 reaches 5.71μm, the flexural strength of the sample reaches 128 MPa. The remaining manganese borax minerals in the tailings are the key components that substantially reduce the sintering temperature of the glass-ceramics.